com.trolltech.qt.gui
Class QPainter

java.lang.Object
  extended by com.trolltech.qt.internal.QSignalEmitterInternal
      extended by com.trolltech.qt.QSignalEmitter
          extended by com.trolltech.qt.QtJambiObject
              extended by com.trolltech.qt.gui.QPainter
All Implemented Interfaces:
QtJambiInterface
Direct Known Subclasses:
QStylePainter

public class QPainter
extends QtJambiObject

The QPainter class performs low-level painting on widgets and other paint devices. QPainter provides highly optimized functions to do most of the drawing GUI programs require. It can draw everything from simple lines to complex shapes like pies and chords. It can also draw aligned text and pixmaps. Normally, it draws in a "natural" coordinate system, but it can also do view and world transformation. QPainter can operate on any object that inherits the QPaintDevice class.

The common use of QPainter is inside a widget's paint event: Construct and customize (e.g. set the pen or the brush) the painter. Then draw. Remember to destroy the QPainter object after drawing. For example:

    @Override
    protected void paintEvent(QPaintEvent e) {
        QPainter painter = new QPainter(this);
        painter.setPen(QColor.blue);
        painter.setFont(new QFont("Arial", 30));
        painter.drawText(rect(), Qt.AlignmentFlag.AlignCenter.value(), "Qt");
        painter.end();
    }
The core functionality of QPainter is drawing, but the class also provide several functions that allows you to customize QPainter's settings and its rendering quality, and others that enable clipping. In addition you can control how different shapes are merged together by specifying the painter's composition mode.

The isActive() function indicates whether the painter is active. A painter is activated by the begin() function and the constructor that takes a QPaintDevice argument. The end() function, and the destructor, deactivates it.

Together with the QPaintDevice and QPaintEngine classes, QPainter form the basis for Qt's paint system. QPainter is the class used to perform drawing operations. QPaintDevice represents a device that can be painted on using a QPainter. QPaintEngine provides the interface that the painter uses to draw onto different types of devices. If the painter is active, device() returns the paint device on which the painter paints, and paintEngine() returns the paint engine that the painter is currently operating on. For more information, see The Paint System documentation.

Sometimes it is desirable to make someone else paint on an unusual QPaintDevice. QPainter supports a static function to do this, setRedirected().

Warning: When the paintdevice is a widget, QPainter can only be used inside a paintEvent() function or in a function called by paintEvent(); that is unless the Qt::WA_PaintOutsidePaintEvent widget attribute is set. On Mac OS X and Windows, you can only paint in a paintEvent() function regardless of this attribute's setting.

Settings

There are several settings that you can customize to make QPainter draw according to your preferences:
Note that some of these settings mirror settings in some paint devices, e.g. QWidget::font(). The QPainter::begin() function (or equivalently the QPainter constructor) copies these attributes from the paint device.

You can at any time save the QPainter's state by calling the save() function which saves all the available settings on an internal stack. The restore() function pops them back.

Drawing

QPainter provides functions to draw most primitives: drawPoint(), drawPoints(), drawLine(), drawRect(), drawRoundedRect(), drawEllipse(), drawArc(), drawPie(), drawChord(), drawPolyline(), drawPolygon(), drawConvexPolygon() and drawCubicBezier(). The two convenience functions, drawRects() and drawLines(), draw the given number of rectangles or lines in the given array of QRects or QLines using the current pen and brush.

The QPainter class also provides the fillRect() function which fills the given QRect, with the given QBrush, and the eraseRect() function that erases the area inside the given rectangle.

All of these functions have both integer and floating point versions.



Basic Drawing Example

The Basic Drawing example shows how to display basic graphics primitives in a variety of styles using the QPainter class.

If you need to draw a complex shape, especially if you need to do so repeatedly, consider creating a QPainterPath and drawing it using drawPath().
Painter Paths example

The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.

The Painter Paths example shows how painter paths can be used to build complex shapes for rendering.



QPainter also provides the fillPath() function which fills the given QPainterPath with the given QBrush, and the strokePath() function that draws the outline of the given path (i.e. strokes the path).

See also the Vector Deformation demo which shows how to use advanced vector techniques to draw text using a QPainterPath, the Gradients demo which shows the different types of gradients that are available in Qt, and the Path Stroking demo which shows Qt's built-in dash patterns and shows how custom patterns can be used to extend the range of available patterns.







Vector Deformation
Gradients
Path Stroking
There are functions to draw pixmaps/images, namely drawPixmap(), drawImage() and drawTiledPixmap(). Both drawPixmap() and drawImage() produce the same result, except that drawPixmap() is faster on-screen while drawImage() may be faster on a QPrinter or other devices.

Text drawing is done using drawText(). When you need fine-grained positioning, boundingRect() tells you where a given drawText() command will draw.

There is a drawPicture() function that draws the contents of an entire QPicture. The drawPicture() function is the only function that disregards all the painter's settings as QPicture has its own settings.

Rendering Quality

To get the optimal rendering result using QPainter, you should use the platform independent QImage as paint device; i.e. using QImage will ensure that the result has an identical pixel representation on any platform.

The QPainter class also provides a means of controlling the rendering quality through its RenderHint enum and the support for floating point precision: All the functions for drawing primitives has a floating point version. These are often used in combination with the QPainter::Antialiasing render hint.



Concentric Circles Example

The Concentric Circles example shows the improved rendering quality that can be obtained using floating point precision and anti-aliasing when drawing custom widgets.

The application's main window displays several widgets which are drawn using the various combinations of precision and anti-aliasing.

The RenderHint enum specifies flags to QPainter that may or may not be respected by any given engine. QPainter::Antialiasing indicates that the engine should antialias edges of primitives if possible, QPainter::TextAntialiasing indicates that the engine should antialias text if possible, and the QPainter::SmoothPixmapTransform indicates that the engine should use a smooth pixmap transformation algorithm. HighQualityAntialiasing is an OpenGL-specific rendering hint indicating that the engine should use fragment programs and offscreen rendering for antialiasing.

The renderHints() function returns a flag that specifies the rendering hints that are set for this painter. Use the setRenderHint() function to set or clear the currently set RenderHints.

Coordinate Transformations

Normally, the QPainter operates on the device's own coordinate system (usually pixels), but QPainter has good support for coordinate transformations.








nop
rotate()
scale()
translate()
The most commonly used transformations are scaling, rotation, translation and shearing. Use the
scale() function to scale the coordinate system by a given offset, the rotate() function to rotate it clockwise and translate() to translate it (i.e. adding a given offset to the points). You can also twist the coordinate system around the origin using the shear() function. See the Affine Transformations demo for a visualization of a sheared coordinate system.

See also the Transformations example which shows how transformations influence the way that QPainter renders graphics primitives. In particular it shows how the order of transformations affects the result.

Affine Transformations Demo

The Affine Transformations demo show Qt's ability to perform affine transformations on painting operations. The demo also allows the user to experiment with the transformation operations and see the results immediately.



All the tranformation operations operate on the transformation worldMatrix(). A matrix transforms a point in the plane to another point. For more information about the transformation matrix, see the The Coordinate System and QMatrix documentation.

The setWorldMatrix() function can replace or add to the currently set worldMatrix(). The resetMatrix() function resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldMatrix(), setViewport() and setWindow() functions. The deviceMatrix() returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device. The latter function is only needed when using platform painting commands on the platform dependent handle, and the platform does not do transformations nativly.

When drawing with QPainter, we specify points using logical coordinates which then are converted into the physical coordinates of the paint device. The mapping of the logical coordinates to the physical coordinates are handled by QPainter's combinedMatrix(), a combination of viewport() and window() and worldMatrix(). The viewport() represents the physical coordinates specifying an arbitrary rectangle, the window() describes the same rectangle in logical coordinates, and the worldMatrix() is identical with the transformation matrix.

See also The Coordinate System documentation.

Clipping

QPainter can clip any drawing operation to a rectangle, a region, or a vector path. The current clip is available using the functions clipRegion() and clipPath(). Whether paths or regions are preferred (faster) depends on the underlying paintEngine(). For example, the QImage paint engine prefers paths while the X11 paint engine prefers regions. Setting a clip is done in the painters logical coordinates.

After QPainter's clipping, the paint device may also clip. For example, most widgets clip away the pixels used by child widgets, and most printers clip away an area near the edges of the paper. This additional clipping is not reflected by the return value of clipRegion() or hasClipping().

Composition Modes

QPainter provides the CompositionMode enum which defines the Porter-Duff rules for digital image compositing; it describes a model for combining the pixels in one image, the source, with the pixels in another image, the destination.

The two most common forms of composition are Source and SourceOver . Source is used to draw opaque objects onto a paint device. In this mode, each pixel in the source replaces the corresponding pixel in the destination. In SourceOver composition mode, the source object is transparent and is drawn on top of the destination.

Note that composition transformation operates pixelwise. For that reason, there is a difference between using the grahic primitive itself and its bounding rectangle: The bounding rect contains pixels with alpha == 0 (i.e the pixels surrounding the primitive). These pixels will overwrite the other image's pixels, affectively clearing those, while the primitive only overwrites its own area.



Composition Modes Demo

The Composition Modes demo, available in Qt's demo directory, allows you to experiment with the various composition modes and see the results immediately.

Limitations

If you are using coordinates with Qt's raster-based paint engine, it is important to note that, while coordinates greater than +/- 215 can be used, any painting performed with coordinates outside this range is not guaranteed to be shown; the drawing may be clipped. This is due to the use of short int in the implementation.

The outlines generated by Qt's stroker are only an approximation when dealing with curved shapes. It is in most cases impossible to represent the outline of a bezier curve segment using another bezier curve segment, and so Qt approximates the curve outlines by using several smaller curves. For performance reasons there is a limit to how many curves Qt uses for these outlines, and thus when using large pen widths or scales the outline error increases. To generate outlines with smaller errors it is possible to use the QPainterPathStroker class, which has the setCurveThreshold member function which let's the user specify the error tolerance. Another workaround is to convert the paths to polygons first and then draw the polygons instead.

See also:
QPaintDevice, QPaintEngine, QtSvg Module, and Basic Drawing Example.


Nested Class Summary
static class QPainter.CompositionMode
          Defines the modes supported for digital image compositing.
static class QPainter.RenderHint
          Renderhints are used to specify flags to QPainter that may or may not be respected by any given engine.
static class QPainter.RenderHints
           
 
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter
QSignalEmitter.AbstractSignal, QSignalEmitter.PrivateSignal0, QSignalEmitter.PrivateSignal1, QSignalEmitter.PrivateSignal2, QSignalEmitter.PrivateSignal3, QSignalEmitter.PrivateSignal4, QSignalEmitter.PrivateSignal5, QSignalEmitter.PrivateSignal6, QSignalEmitter.PrivateSignal7, QSignalEmitter.PrivateSignal8, QSignalEmitter.PrivateSignal9, QSignalEmitter.Signal0, QSignalEmitter.Signal1, QSignalEmitter.Signal2, QSignalEmitter.Signal3, QSignalEmitter.Signal4, QSignalEmitter.Signal5, QSignalEmitter.Signal6, QSignalEmitter.Signal7, QSignalEmitter.Signal8, QSignalEmitter.Signal9
 
Nested classes/interfaces inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
com.trolltech.qt.internal.QSignalEmitterInternal.AbstractSignalInternal
 
Field Summary
 
Fields inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
currentSender
 
Constructor Summary
QPainter()
          Constructs a painter.
QPainter(QPaintDeviceInterface arg__1)
          Constructs a painter that begins painting the paint device immediately.
QPainter(QWidget widget)
          Creates a QPainter with parent widget.
 
Method Summary
 QBrush background()
          Returns the current background brush.
 Qt.BGMode backgroundMode()
          Returns the current background mode.
 boolean begin(QPaintDeviceInterface arg__1)
          Begins painting the paint device and returns true if successful; otherwise returns false.
 boolean begin(QWidget widget)
          This method initializes the painter to draw on widget.
 QRect boundingRect(int x, int y, int w, int h, int flags, java.lang.String text)
          This is an overloaded member function, provided for convenience.
 QRectF boundingRect(QRectF rect, int flags, java.lang.String text)
          Returns the bounding rectangle of the text as it will appear when drawn inside the given rectangle with the specified flags using the currently set font(); i.e the function tells you where the drawText() function will draw when given the same arguments.
 QRectF boundingRect(QRectF rect, java.lang.String text)
          This is an overloaded member function, provided for convenience.
 QRectF boundingRect(QRectF rect, java.lang.String text, QTextOption o)
          This is an overloaded member function, provided for convenience.
 QRect boundingRect(QRect rect, int flags, java.lang.String text)
          This is an overloaded member function, provided for convenience.
 QBrush brush()
          Returns the painter's current brush.
 QPoint brushOrigin()
          Returns the currently set brush origin.
 QPainterPath clipPath()
          Returns the currently clip as a path.
 QRegion clipRegion()
          Returns the currently set clip region.
 QMatrix combinedMatrix()
          Returns the transformation matrix combining the current window/viewport and world transformation.
 QTransform combinedTransform()
          Returns the transformation matrix combining the current window/viewport and world transformation.
 QPainter.CompositionMode compositionMode()
          Returns the current composition mode.
 QPaintDeviceInterface device()
          Returns the paint device on which this painter is currently painting, or 0 if the painter is not active.
 QMatrix deviceMatrix()
          Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.
 QTransform deviceTransform()
          Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.
 void drawArc(int x, int y, int w, int h, int a, int alen)
          This is an overloaded member function, provided for convenience.
 void drawArc(QRectF rect, int a, int alen)
          This is an overloaded member function, provided for convenience.
 void drawArc(QRect arg__1, int a, int alen)
           
 void drawChord(int x, int y, int w, int h, int a, int alen)
          This is an overloaded member function, provided for convenience.
 void drawChord(QRectF rect, int a, int alen)
          This is an overloaded member function, provided for convenience.
 void drawChord(QRect arg__1, int a, int alen)
           
 void drawConvexPolygon(QPolygon polygon)
          This is an overloaded member function, provided for convenience.
 void drawConvexPolygon(QPolygonF polygon)
          This is an overloaded member function, provided for convenience.
 void drawEllipse(int x, int y, int w, int h)
          This is an overloaded member function, provided for convenience.
 void drawEllipse(QPointF center, double rx, double ry)
          This is an overloaded member function, provided for convenience.
 void drawEllipse(QPoint center, int rx, int ry)
          This is an overloaded member function, provided for convenience.
 void drawEllipse(QRect r)
          This is an overloaded member function, provided for convenience.
 void drawEllipse(QRectF r)
          Draws the ellipse defined by the given rectangle.
 void drawImage(int x, int y, QImage image)
          This is an overloaded member function, provided for convenience.
 void drawImage(int x, int y, QImage image, int sx)
          This is an overloaded member function, provided for convenience.
 void drawImage(int x, int y, QImage image, int sx, int sy)
          This is an overloaded member function, provided for convenience.
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw)
          This is an overloaded member function, provided for convenience.
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw, int sh)
          This is an overloaded member function, provided for convenience.
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw, int sh, Qt.ImageConversionFlag[] flags)
          This is an overloaded method provided for convenience.
 void drawImage(int x, int y, QImage image, int sx, int sy, int sw, int sh, Qt.ImageConversionFlags flags)
          This is an overloaded member function, provided for convenience.
 void drawImage(QPointF p, QImage image)
          This is an overloaded member function, provided for convenience.
 void drawImage(QPointF p, QImage image, QRectF sr)
          This is an overloaded member function, provided for convenience.
 void drawImage(QPointF p, QImage image, QRectF sr, Qt.ImageConversionFlag[] flags)
          This is an overloaded method provided for convenience.
 void drawImage(QPointF p, QImage image, QRectF sr, Qt.ImageConversionFlags flags)
          This is an overloaded member function, provided for convenience.
 void drawImage(QPoint p, QImage image)
           
 void drawImage(QPoint p, QImage image, QRect sr)
          This is an overloaded member function, provided for convenience.
 void drawImage(QPoint p, QImage image, QRect sr, Qt.ImageConversionFlag[] flags)
           
 void drawImage(QPoint p, QImage image, QRect sr, Qt.ImageConversionFlags flags)
           
 void drawImage(QRectF r, QImage image)
          This is an overloaded member function, provided for convenience.
 void drawImage(QRectF targetRect, QImage image, QRectF sourceRect)
          Draws the rectangular portion source of the given image into the target rectangle in the paint device.
 void drawImage(QRectF targetRect, QImage image, QRectF sourceRect, Qt.ImageConversionFlag[] flags)
          This is an overloaded method provided for convenience.
 void drawImage(QRectF targetRect, QImage image, QRectF sourceRect, Qt.ImageConversionFlags flags)
          This is an overloaded member function, provided for convenience.
 void drawImage(QRect r, QImage image)
           
 void drawImage(QRect targetRect, QImage image, QRect sourceRect)
          This is an overloaded member function, provided for convenience.
 void drawImage(QRect targetRect, QImage image, QRect sourceRect, Qt.ImageConversionFlag[] flags)
           
 void drawImage(QRect targetRect, QImage image, QRect sourceRect, Qt.ImageConversionFlags flags)
           
 void drawLine(int x1, int y1, int x2, int y2)
          This is an overloaded member function, provided for convenience.
 void drawLine(QLine line)
          This is an overloaded member function, provided for convenience.
 void drawLine(QLineF line)
          Draws a line defined by line.
 void drawLine(QPointF p1, QPointF p2)
          This is an overloaded member function, provided for convenience.
 void drawLine(QPoint p1, QPoint p2)
          This is an overloaded member function, provided for convenience.
 void drawLines(java.util.List lines)
          This is an overloaded member function, provided for convenience.
 void drawLinesF(java.util.List lines)
          This is an overloaded member function, provided for convenience.
 void drawLinesFromPoints(java.util.List pointPairs)
          This is an overloaded member function, provided for convenience.
 void drawLinesFromPointsF(java.util.List pointPairs)
          This is an overloaded member function, provided for convenience.
 void drawPath(QPainterPath path)
          Draws the given painter path using the current pen for outline and the current brush for filling.
 void drawPicture(int x, int y, QPicture picture)
          This is an overloaded member function, provided for convenience.
 void drawPicture(QPointF p, QPicture picture)
          This is an overloaded member function, provided for convenience.
 void drawPicture(QPoint p, QPicture picture)
           
 void drawPie(int x, int y, int w, int h, int a, int alen)
          This is an overloaded member function, provided for convenience.
 void drawPie(QRectF rect, int a, int alen)
          This is an overloaded member function, provided for convenience.
 void drawPie(QRect arg__1, int a, int alen)
           
 void drawPixmap(int x, int y, int w, int h, QPixmap pm)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(int x, int y, int w, int h, QPixmap pm, int sx, int sy, int sw, int sh)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(int x, int y, QPixmap pm)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(int x, int y, QPixmap pm, int sx, int sy, int sw, int sh)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(QPointF p, QPixmap pm)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(QPointF p, QPixmap pm, QRectF sr)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(QPoint p, QPixmap pm)
           
 void drawPixmap(QPoint p, QPixmap pm, QRect sr)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(QRectF targetRect, QPixmap pixmap, QRectF sourceRect)
          Draws the rectangular portion source of the given pixmap into the given target in the paint device.
 void drawPixmap(QRect r, QPixmap pm)
          This is an overloaded member function, provided for convenience.
 void drawPixmap(QRect targetRect, QPixmap pixmap, QRect sourceRect)
          This is an overloaded member function, provided for convenience.
 void drawPoint(int x, int y)
          This is an overloaded member function, provided for convenience.
 void drawPoint(QPoint p)
          This is an overloaded member function, provided for convenience.
 void drawPoint(QPointF pt)
          Draws a single point at the given position using the current pen's color.
 void drawPoints(QPolygon points)
          This is an overloaded member function, provided for convenience.
 void drawPoints(QPolygonF points)
          This is an overloaded member function, provided for convenience.
 void drawPolygon(QPolygon polygon)
          This is an overloaded member function, provided for convenience.
 void drawPolygon(QPolygonF polygon)
          This is an overloaded member function, provided for convenience.
 void drawPolygon(QPolygonF polygon, Qt.FillRule fillRule)
          This is an overloaded member function, provided for convenience.
 void drawPolygon(QPolygon polygon, Qt.FillRule fillRule)
           
 void drawPolyline(QPolygon polygon)
          This is an overloaded member function, provided for convenience.
 void drawPolyline(QPolygonF polyline)
          This is an overloaded member function, provided for convenience.
 void drawRect(int x1, int y1, int w, int h)
          This is an overloaded member function, provided for convenience.
 void drawRect(QRect rect)
          This is an overloaded member function, provided for convenience.
 void drawRect(QRectF rect)
          Draws the current rectangle with the current pen and brush.
 void drawRects(java.util.List rectangles)
          This is an overloaded member function, provided for convenience.
 void drawRectsF(java.util.List rectangles)
          This is an overloaded member function, provided for convenience.
 void drawRoundedRect(int x, int y, int w, int h, double xRadius, double yRadius)
          This is an overloaded member function, provided for convenience.
 void drawRoundedRect(int x, int y, int w, int h, double xRadius, double yRadius, Qt.SizeMode mode)
          This is an overloaded member function, provided for convenience.
 void drawRoundedRect(QRect rect, double xRadius, double yRadius)
           
 void drawRoundedRect(QRect rect, double xRadius, double yRadius, Qt.SizeMode mode)
           
 void drawRoundedRect(QRectF rect, double xRadius, double yRadius)
          This is an overloaded member function, provided for convenience.
 void drawRoundedRect(QRectF rect, double xRadius, double yRadius, Qt.SizeMode mode)
          This is an overloaded member function, provided for convenience.
 void drawRoundRect(int x, int y, int w, int h)
          This is an overloaded member function, provided for convenience.
 void drawRoundRect(int x, int y, int w, int h, int arg__5)
          This is an overloaded member function, provided for convenience.
 void drawRoundRect(int x, int y, int w, int h, int arg__5, int arg__6)
          This is an overloaded member function, provided for convenience.
 void drawRoundRect(QRect r)
          This is an overloaded member function, provided for convenience.
 void drawRoundRect(QRectF r)
          Draws a rectangle r with rounded corners.
 void drawRoundRect(QRectF r, int xround)
          This is an overloaded member function, provided for convenience.
 void drawRoundRect(QRectF r, int xround, int yround)
          This is an overloaded member function, provided for convenience.
 void drawRoundRect(QRect r, int xround)
           
 void drawRoundRect(QRect r, int xround, int yround)
           
 void drawText(int x, int y, int width, int height, int flags, java.lang.String text)
          This is an overloaded method provided for convenience.
 void drawText(int x, int y, int width, int height, int flags, java.lang.String text, QRect boundingRect)
          Draws the given text within the rectangle with origin (x, y), width and height.
 void drawText(int x, int y, java.lang.String s)
          This is an overloaded member function, provided for convenience.
 void drawText(QPointF p, java.lang.String s)
          This is an overloaded member function, provided for convenience.
 void drawText(QPoint p, java.lang.String s)
           
 void drawText(QRectF rectangle, int flags, java.lang.String text)
          This is an overloaded function provided for convenience.
 void drawText(QRectF rectangle, int flags, java.lang.String text, QRectF boundingRect)
          Draws the given text within the provided rectangle.
 void drawText(QRectF r, java.lang.String text)
          This is an overloaded member function, provided for convenience.
 void drawText(QRectF r, java.lang.String text, QTextOption o)
          This is an overloaded member function, provided for convenience.
 void drawText(QRect rectangle, int flags, java.lang.String text)
           
 void drawText(QRect rectangle, int flags, java.lang.String text, QRect boundingRect)
          Draws the given text within the provided rectangle.
 void drawTextItem(QPoint p, QTextItem ti)
           
 void drawTiledPixmap(int x, int y, int w, int h, QPixmap arg__5)
          This is an overloaded member function, provided for convenience.
 void drawTiledPixmap(int x, int y, int w, int h, QPixmap arg__5, int sx)
          This is an overloaded member function, provided for convenience.
 void drawTiledPixmap(int x, int y, int w, int h, QPixmap arg__5, int sx, int sy)
          This is an overloaded member function, provided for convenience.
 void drawTiledPixmap(QRectF rect, QPixmap pm)
          This is an overloaded member function, provided for convenience.
 void drawTiledPixmap(QRectF rect, QPixmap pm, QPointF offset)
          Draws a tiled pixmap, inside the given rectangle with its origin at the given position.
 void drawTiledPixmap(QRect arg__1, QPixmap arg__2)
           
 void drawTiledPixmap(QRect arg__1, QPixmap arg__2, QPoint arg__3)
          This is an overloaded member function, provided for convenience.
 boolean end()
          Ends painting.
 void eraseRect(int x, int y, int w, int h)
          This is an overloaded member function, provided for convenience.
 void eraseRect(QRect arg__1)
          This is an overloaded member function, provided for convenience.
 void eraseRect(QRectF arg__1)
          Erases the area inside the given rectangle.
 void fillPath(QPainterPath path, QBrush brush)
          Fills the given path using the given brush.
 void fillRect(int x, int y, int w, int h, QBrush arg__5)
          This is an overloaded member function, provided for convenience.
 void fillRect(int x, int y, int w, int h, QColor color)
          This is an overloaded member function, provided for convenience.
 void fillRect(int x, int y, int w, int h, Qt.BrushStyle style)
          This is an overloaded member function, provided for convenience.
 void fillRect(int x, int y, int w, int h, Qt.GlobalColor c)
          This is an overloaded member function, provided for convenience.
 void fillRect(QRectF arg__1, QBrush arg__2)
          This is an overloaded member function, provided for convenience.
 void fillRect(QRectF arg__1, QColor color)
          This is an overloaded member function, provided for convenience.
 void fillRect(QRectF r, Qt.BrushStyle style)
          This is an overloaded member function, provided for convenience.
 void fillRect(QRectF r, Qt.GlobalColor c)
          This is an overloaded member function, provided for convenience.
 void fillRect(QRect arg__1, QBrush arg__2)
           
 void fillRect(QRect arg__1, QColor color)
           
 void fillRect(QRect r, Qt.BrushStyle style)
           
 void fillRect(QRect r, Qt.GlobalColor c)
           
 QFont font()
          Returns the currently set font used for drawing text.
 QFontInfo fontInfo()
          Returns the font info for the painter if the painter is active.
 QFontMetrics fontMetrics()
          Returns the font metrics for the painter if the painter is active.
 boolean hasClipping()
          Returns true if clipping has been set; otherwise returns false.
 void initFrom(QWidget widget)
          Initializes the painters pen, background and font to the same as the given widget.
 boolean isActive()
          Returns true if begin() has been called and end() has not yet been called; otherwise returns false.
 Qt.LayoutDirection layoutDirection()
          Returns the layout direction used by the painter when drawing text.
 double opacity()
          Returns the opacity of the painter.
 QPaintEngine paintEngine()
          Returns the paint engine that the painter is currently operating on if the painter is active; otherwise 0.
 QPen pen()
          Returns the painter's current pen.
static QPaintDeviceInterface redirected(QPaintDeviceInterface device, QPoint offset)
          Returns the replacement for given device.
 QPainter.RenderHints renderHints()
          Returns a flag that specifies the rendering hints that are set for this painter.
 void resetMatrix()
          Resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldMatrix(), setViewport() and setWindow().
 void resetTransform()
          Resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldTransform(), setViewport() and setWindow().
 void restore()
          Restores the current painter state (pops a saved state off the stack).
static void restoreRedirected(QPaintDeviceInterface device)
          Restores the previous redirection for the given device after a call to setRedirected().
 void rotate(double a)
          Rotates the coordinate system the given angle clockwise.
 void save()
          Saves the current painter state (pushes the state onto a stack).
 void scale(double sx, double sy)
          Scales the coordinate system by (sx, sy).
 void setBackground(QBrush bg)
          Sets the background brush of the painter to the given brush.
 void setBackgroundMode(Qt.BGMode mode)
          Sets the background mode of the painter to the given mode
 void setBrush(QBrush brush)
          Sets the painter's brush to the given brush.
 void setBrush(QColor color)
          Sets the brush of this QPainter to a solid color brush.
 void setBrush(QGradient gradient)
          Sets this QPainter's brush to use gradient.
 void setBrush(QPixmap pm)
          Sets this QPainter's brush to use pm.
 void setBrush(Qt.BrushStyle style)
          This is an overloaded member function, provided for convenience.
 void setBrushOrigin(int x, int y)
          This is an overloaded member function, provided for convenience.
 void setBrushOrigin(QPoint arg__1)
          This is an overloaded member function, provided for convenience.
 void setBrushOrigin(QPointF arg__1)
          Sets the brush origin to position.
 void setClipPath(QPainterPath path)
          Enables clipping, and sets the clip path for the painter to the given path, with the clip operation.
 void setClipPath(QPainterPath path, Qt.ClipOperation op)
          Enables clipping, and sets the clip path for the painter to the given path, with the clip operation.
 void setClipping(boolean enable)
          Enables clipping if enable is true, or disables clipping if enable is false.
 void setClipRect(int x, int y, int w, int h)
          Enables clipping, and sets the clip region to the rectangle beginning at (x, y) with the given width and height.
 void setClipRect(int x, int y, int w, int h, Qt.ClipOperation op)
          Enables clipping, and sets the clip region to the rectangle beginning at (x, y) with the given width and height.
 void setClipRect(QRect arg__1)
          This is an overloaded member function, provided for convenience.
 void setClipRect(QRectF arg__1)
          Enables clipping, and sets the clip region to the given rectangle using the given clip operation.
 void setClipRect(QRectF arg__1, Qt.ClipOperation op)
          This is an overloaded member function, provided for convenience.
 void setClipRect(QRect arg__1, Qt.ClipOperation op)
           
 void setClipRegion(QRegion arg__1)
          Sets the clip region to the given region using the specified clip operation.
 void setClipRegion(QRegion arg__1, Qt.ClipOperation op)
          Sets the clip region to the given region using the specified clip operation.
 void setCompositionMode(QPainter.CompositionMode mode)
          Sets the composition mode to the given mode.
 void setFont(QFont f)
          Sets the painter's font to the given font.
 void setLayoutDirection(Qt.LayoutDirection direction)
          Sets the layout direction used by the painter when drawing text, to the specified direction.
 void setOpacity(double opacity)
          Sets the opacity of the painter to opacity.
 void setPen(QColor color)
          This is an overloaded member function, provided for convenience.
 void setPen(QPen pen)
          Sets the painter's pen to be the given pen.
 void setPen(Qt.PenStyle style)
          This is an overloaded member function, provided for convenience.
static void setRedirected(QPaintDeviceInterface device, QPaintDeviceInterface replacement)
          Redirects all paint commands for the given paint device, to the replacement device.
static void setRedirected(QPaintDeviceInterface device, QPaintDeviceInterface replacement, QPoint offset)
          Redirects all paint commands for the given paint device, to the replacement device.
 void setRenderHint(QPainter.RenderHint hint)
          Sets the given render hint on the painter if on is true; otherwise clears the render hint.
 void setRenderHint(QPainter.RenderHint hint, boolean on)
          Sets the given render hint on the painter if on is true; otherwise clears the render hint.
 void setRenderHints(QPainter.RenderHints hints)
          Sets the given render hints on the painter if on is true; otherwise clears the render hints.
 void setRenderHints(QPainter.RenderHints hints, boolean on)
          Sets the given render hints on the painter if on is true; otherwise clears the render hints.
 void setTransform(QTransform transform)
          Sets the world transformation matrix.
 void setTransform(QTransform transform, boolean combine)
          Sets the world transformation matrix.
 void setViewport(int x, int y, int w, int h)
          This is an overloaded member function, provided for convenience.
 void setViewport(QRect viewport)
          Sets the painter's viewport rectangle to the given rectangle, and enables view transformations.
 void setViewTransformEnabled(boolean enable)
          Enables view transformations if enable is true, or disables view transformations if enable is false.
 void setWindow(int x, int y, int w, int h)
          This is an overloaded member function, provided for convenience.
 void setWindow(QRect window)
          Sets the painter's window to the given rectangle, and enables view transformations.
 void setWorldMatrix(QMatrix matrix)
          Sets the transformation matrix to matrix and enables transformations.
 void setWorldMatrix(QMatrix matrix, boolean combine)
          Sets the transformation matrix to matrix and enables transformations.
 void setWorldMatrixEnabled(boolean enabled)
          Enables transformations if enable is true, or disables transformations if enable is false.
 void setWorldTransform(QTransform matrix)
          Sets the world transformation matrix.
 void setWorldTransform(QTransform matrix, boolean combine)
          Sets the world transformation matrix.
 void shear(double sh, double sv)
          Shears the coordinate system by (sh, sv).
 void strokePath(QPainterPath path, QPen pen)
          Draws the outline (strokes) the path path with the pen specified by pen
 boolean testRenderHint(QPainter.RenderHint hint)
          Returns true if hint is set; otherwise returns false.
 QTransform transform()
          Returns the world transformation matrix.
 void translate(double dx, double dy)
          This is an overloaded member function, provided for convenience.
 void translate(QPoint offset)
          This is an overloaded member function, provided for convenience.
 void translate(QPointF offset)
          Translates the coordinate system by the given offset; i.
 QRect viewport()
          Returns the viewport rectangle.
 boolean viewTransformEnabled()
          Returns true if view transformation is enabled; otherwise returns false.
 QRect window()
          Returns the window rectangle.
 QMatrix worldMatrix()
          Returns the world transformation matrix.
 boolean worldMatrixEnabled()
          Returns true if world transformation is enabled; otherwise returns false.
 QTransform worldTransform()
          Returns the world transformation matrix.
 
Methods inherited from class com.trolltech.qt.QtJambiObject
dispose, disposed, equals, finalize, reassignNativeResources, tr, tr, tr
 
Methods inherited from class com.trolltech.qt.QSignalEmitter
blockSignals, disconnect, disconnect, signalsBlocked, signalSender, thread
 
Methods inherited from class com.trolltech.qt.internal.QSignalEmitterInternal
__qt_signalInitialization
 
Methods inherited from class java.lang.Object
clone, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface com.trolltech.qt.QtJambiInterface
disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership
 

Constructor Detail

QPainter

public QPainter()
Constructs a painter.

See also:
begin(), and end().


QPainter

public QPainter(QPaintDeviceInterface arg__1)
Constructs a painter that begins painting the paint device immediately.

This constructor is convenient for short-lived painters, e.g. in a QWidget::paintEvent() and should be used only once. The constructor calls begin() for you and the QPainter destructor automatically calls end().

Here's an example using begin() and end():

    @Override
    protected void paintEvent(QPaintEvent e) {
        QPainter p = new QPainter();
        p.begin(this);
        p.drawLine(line);        // drawing code
        p.end();
    }
The same example using this constructor:
    @Override
    protected void paintEvent(QPaintEvent e) {
        QPainter p = new QPainter(this);
        p.drawLine(line);        // drawing code
        p.end();
    }
Since the constructor cannot provide feedback when the initialization of the painter failed you should rather use begin() and end() to paint on external devices, e.g. printers.

See also:
begin(), and end().


QPainter

public QPainter(QWidget widget)
Creates a QPainter with parent widget.

Method Detail

background

public final QBrush background()
Returns the current background brush.

See also:
setBackground(), and Settings.


backgroundMode

public final Qt.BGMode backgroundMode()
Returns the current background mode.

See also:
setBackgroundMode(), and Settings.


begin

public final boolean begin(QPaintDeviceInterface arg__1)
Begins painting the paint device and returns true if successful; otherwise returns false.

Notice that all painter settings (setPen(), setBrush() etc.) are reset to default values when begin() is called.

The errors that can occur are serious problems, such as these:

        painter.begin(null); // impossible - paint device cannot be null

        QPixmap image = new QPixmap(0, 0);
        painter.begin(image); // impossible - image.isNull() == true;

        painter.begin(myWidget);
        painter2.begin(myWidget); // impossible - only one painter at a time
Note that most of the time, you can use one of the constructors instead of begin(), and that end() is automatically done at destruction.

Warning: A paint device can only be painted by one painter at a time.

See also:
end(), and QPainter().


boundingRect

public final QRect boundingRect(QRect rect,
                                int flags,
                                java.lang.String text)
This is an overloaded member function, provided for convenience.

Returns the bounding rectangle of the text as it will appear when drawn inside the given rectangle with the specified flags using the currently set font().


boundingRect

public final QRectF boundingRect(QRectF rect,
                                 java.lang.String text)
This is an overloaded member function, provided for convenience.

Instead of specifying flags as a bitwise OR of the Qt::AlignmentFlag and Qt::TextFlag , this overloaded function takes an option argument. The QTextOption class provides a description of general rich text properties.

See also:
QTextOption.


boundingRect

public final QRectF boundingRect(QRectF rect,
                                 java.lang.String text,
                                 QTextOption o)
This is an overloaded member function, provided for convenience.

Instead of specifying flags as a bitwise OR of the Qt::AlignmentFlag and Qt::TextFlag , this overloaded function takes an option argument. The QTextOption class provides a description of general rich text properties.

See also:
QTextOption.


boundingRect

public final QRectF boundingRect(QRectF rect,
                                 int flags,
                                 java.lang.String text)
Returns the bounding rectangle of the text as it will appear when drawn inside the given rectangle with the specified flags using the currently set font(); i.e the function tells you where the drawText() function will draw when given the same arguments.

If the text does not fit within the given rectangle using the specified flags, the function returns the required rectangle.

The flags argument is a bitwise OR of the following flags:

If several of the horizontal or several of the vertical alignment flags are set, the resulting alignment is undefined.

See also:
drawText(), Qt::Alignment, and Qt::TextFlag .


boundingRect

public final QRect boundingRect(int x,
                                int y,
                                int w,
                                int h,
                                int flags,
                                java.lang.String text)
This is an overloaded member function, provided for convenience.

Returns the bounding rectangle of the given text as it will appear when drawn inside the rectangle beginning at the point (x, y) with width w and height h.


brush

public final QBrush brush()
Returns the painter's current brush.

See also:
QPainter::setBrush(), and Settings.


brushOrigin

public final QPoint brushOrigin()
Returns the currently set brush origin.

See also:
setBrushOrigin(), and Settings.


clipPath

public final QPainterPath clipPath()
Returns the currently clip as a path. Note that the clip path is given in logical coordinates.

See also:
setClipPath(), clipRegion(), and setClipping().


clipRegion

public final QRegion clipRegion()
Returns the currently set clip region. Note that the clip region is given in logical coordinates.

See also:
setClipRegion(), clipPath(), and setClipping().


combinedMatrix

public final QMatrix combinedMatrix()
Returns the transformation matrix combining the current window/viewport and world transformation.

It is advisable to use combinedTransform() instead of this function to preserve the properties of perspective transformations.

See also:
setWorldMatrix(), setWindow(), and setViewport().


combinedTransform

public final QTransform combinedTransform()
Returns the transformation matrix combining the current window/viewport and world transformation.

See also:
setWorldMatrix(), setWindow(), and setViewport().


compositionMode

public final QPainter.CompositionMode compositionMode()
Returns the current composition mode.

See also:
CompositionMode , and setCompositionMode().


device

public final QPaintDeviceInterface device()
Returns the paint device on which this painter is currently painting, or 0 if the painter is not active.

See also:
isActive().


deviceMatrix

public final QMatrix deviceMatrix()
Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.

Note: It is advisable to use deviceTransform() instead of this function to preserve the properties of perspective transformations.

This function is only needed when using platform painting commands on the platform dependent handle (Qt::HANDLE), and the platform does not do transformations nativly.

The QPaintEngine::PaintEngineFeature enum can be queried to determine whether the platform performs the transformations or not.

See also:
worldMatrix(), and QPaintEngine::hasFeature().


deviceTransform

public final QTransform deviceTransform()
Returns the matrix that transforms from logical coordinates to device coordinates of the platform dependent paint device.

This function is only needed when using platform painting commands on the platform dependent handle (Qt::HANDLE), and the platform does not do transformations nativly.

The QPaintEngine::PaintEngineFeature enum can be queried to determine whether the platform performs the transformations or not.

See also:
worldTransform(), and QPaintEngine::hasFeature().


drawArc

public final void drawArc(QRect arg__1,
                          int a,
                          int alen)

drawArc

public final void drawArc(QRectF rect,
                          int a,
                          int alen)
This is an overloaded member function, provided for convenience.

Draws the arc defined by the given rectangle, startAngle and spanAngle.


drawArc

public final void drawArc(int x,
                          int y,
                          int w,
                          int h,
                          int a,
                          int alen)
This is an overloaded member function, provided for convenience.

Draws the arc defined by the rectangle beginning at (x, y) with the specified width and height, and the given startAngle and spanAngle.


drawChord

public final void drawChord(QRect arg__1,
                            int a,
                            int alen)

drawChord

public final void drawChord(QRectF rect,
                            int a,
                            int alen)
This is an overloaded member function, provided for convenience.

Draws the chord defined by the given rectangle, startAngle and spanAngle.


drawChord

public final void drawChord(int x,
                            int y,
                            int w,
                            int h,
                            int a,
                            int alen)
This is an overloaded member function, provided for convenience.

Draws the chord defined by the rectangle beginning at (x, y) with the specified width and height, and the given startAngle and spanAngle.


drawConvexPolygon

public final void drawConvexPolygon(QPolygon polygon)
This is an overloaded member function, provided for convenience.

Draws the convex polygon defined by polygon using the current pen and brush.


drawConvexPolygon

public final void drawConvexPolygon(QPolygonF polygon)
This is an overloaded member function, provided for convenience.

Draws the convex polygon defined by polygon using the current pen and brush.


drawEllipse

public final void drawEllipse(QPoint center,
                              int rx,
                              int ry)
This is an overloaded member function, provided for convenience.

Draws the ellipse positioned at center with radii rx and ry.


drawEllipse

public final void drawEllipse(QPointF center,
                              double rx,
                              double ry)
This is an overloaded member function, provided for convenience.

Draws the ellipse positioned at center with radii rx and ry.


drawEllipse

public final void drawEllipse(QRect r)
This is an overloaded member function, provided for convenience.

Draws the ellipse defined by the given rectangle.


drawEllipse

public final void drawEllipse(QRectF r)
Draws the ellipse defined by the given rectangle.

A filled ellipse has a size of rectangle.size(). A stroked ellipse has a size of rectangle.size() plus the pen width.



        QRectF rectangle = new QRectF(10.0, 20.0, 80.0, 60.0);

        QPainter painter = new QPainter(this);
        painter.drawEllipse(rectangle);
        painter.end();

See also:
drawPie(), and The Coordinate System.


drawEllipse

public final void drawEllipse(int x,
                              int y,
                              int w,
                              int h)
This is an overloaded member function, provided for convenience.

Draws the ellipse defined by the rectangle beginning at (x, y) with the given width and height.


drawImage

public final void drawImage(QPoint p,
                            QImage image)

drawImage

public final void drawImage(QPoint p,
                            QImage image,
                            QRect sr,
                            Qt.ImageConversionFlag[] flags)

drawImage

public final void drawImage(QPoint p,
                            QImage image,
                            QRect sr)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given image with its origin at the given point.


drawImage

public final void drawImage(QPoint p,
                            QImage image,
                            QRect sr,
                            Qt.ImageConversionFlags flags)

drawImage

public final void drawImage(QPointF p,
                            QImage image)
This is an overloaded member function, provided for convenience.

Draws the given image at the given point.


drawImage

public final void drawImage(QPointF p,
                            QImage image,
                            QRectF sr,
                            Qt.ImageConversionFlag[] flags)
This is an overloaded method provided for convenience.


drawImage

public final void drawImage(QPointF p,
                            QImage image,
                            QRectF sr)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given image with its origin at the given point.


drawImage

public final void drawImage(QPointF p,
                            QImage image,
                            QRectF sr,
                            Qt.ImageConversionFlags flags)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given image with its origin at the given point.


drawImage

public final void drawImage(QRect r,
                            QImage image)

drawImage

public final void drawImage(QRect targetRect,
                            QImage image,
                            QRect sourceRect,
                            Qt.ImageConversionFlag[] flags)

drawImage

public final void drawImage(QRect targetRect,
                            QImage image,
                            QRect sourceRect)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given image into the target rectangle in the paint device.

Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.


drawImage

public final void drawImage(QRect targetRect,
                            QImage image,
                            QRect sourceRect,
                            Qt.ImageConversionFlags flags)

drawImage

public final void drawImage(QRectF r,
                            QImage image)
This is an overloaded member function, provided for convenience.

Draws the given image into the given rectangle.

Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.


drawImage

public final void drawImage(QRectF targetRect,
                            QImage image,
                            QRectF sourceRect,
                            Qt.ImageConversionFlag[] flags)
This is an overloaded method provided for convenience.


drawImage

public final void drawImage(QRectF targetRect,
                            QImage image,
                            QRectF sourceRect)
Draws the rectangular portion source of the given image into the target rectangle in the paint device.

Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.

If the image needs to be modified to fit in a lower-resolution result (e.g. converting from 32-bit to 8-bit), use the flags to specify how you would prefer this to happen.

    QRectF target = new QRectF(10.0, 20.0, 80.0, 60.0);
    QRectF source = new QRectF(0.0, 0.0, 70.0, 40.0);
    QImage image = new QImage("classpath:/images/myImage.png");

    QPainter painter = new QPainter(this);
    painter.drawImage(target, image, source);
    painter.end();

See also:
drawPixmap().


drawImage

public final void drawImage(QRectF targetRect,
                            QImage image,
                            QRectF sourceRect,
                            Qt.ImageConversionFlags flags)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given image into the target rectangle in the paint device.

Note: The image is scaled to fit the rectangle, if both the image and rectangle size disagree.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw,
                            int sh,
                            Qt.ImageConversionFlag[] flags)
This is an overloaded method provided for convenience.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw,
                            int sh)
This is an overloaded member function, provided for convenience.

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw)
This is an overloaded member function, provided for convenience.

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy)
This is an overloaded member function, provided for convenience.

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx)
This is an overloaded member function, provided for convenience.

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image)
This is an overloaded member function, provided for convenience.

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawImage

public final void drawImage(int x,
                            int y,
                            QImage image,
                            int sx,
                            int sy,
                            int sw,
                            int sh,
                            Qt.ImageConversionFlags flags)
This is an overloaded member function, provided for convenience.

Draws an image at (x, y) by copying a part of image into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in image that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the image that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the image.


drawLine

public final void drawLine(QLine line)
This is an overloaded member function, provided for convenience.

Draws a line defined by line.


drawLine

public final void drawLine(QLineF line)
Draws a line defined by line.


    QLineF line = new QLineF(10.0, 80.0, 90.0, 20.0);

    QPainter painter = new QPainter(this);
    painter.drawLine(line);
    painter.end();

See also:
drawLines(), drawPolyline(), and The Coordinate System.


drawLine

public final void drawLine(QPoint p1,
                           QPoint p2)
This is an overloaded member function, provided for convenience.

Draws a line from p1 to p2.


drawLine

public final void drawLine(QPointF p1,
                           QPointF p2)
This is an overloaded member function, provided for convenience.

Draws a line from p1 to p2.


drawLine

public final void drawLine(int x1,
                           int y1,
                           int x2,
                           int y2)
This is an overloaded member function, provided for convenience.

Draws a line from (x1, y1) to (x2, y2) and sets the current pen position to (x2, y2).


drawLines

public final void drawLines(java.util.List lines)
This is an overloaded member function, provided for convenience.

Draws the set of lines defined by the list lines using the current pen and brush.


drawLinesF

public final void drawLinesF(java.util.List lines)
This is an overloaded member function, provided for convenience.

Draws the set of lines defined by the list lines using the current pen and brush.


drawLinesFromPoints

public final void drawLinesFromPoints(java.util.List pointPairs)
This is an overloaded member function, provided for convenience.

Draws a line for each pair of points in the vector pointPairs using the current pen.


drawLinesFromPointsF

public final void drawLinesFromPointsF(java.util.List pointPairs)
This is an overloaded member function, provided for convenience.

Draws a line for each pair of points in the vector pointPairs using the current pen. If there is an odd number of points in the array, the last point will be ignored.


drawPath

public final void drawPath(QPainterPath path)
Draws the given painter path using the current pen for outline and the current brush for filling.


    QPainterPath path = new QPainterPath();
    path.moveTo(20, 80);
    path.lineTo(20, 30);
    path.cubicTo(80, 0, 50, 50, 80, 80);

    QPainter painter = new QPainter(this);
    painter.drawPath(path);
    painter.end();

See also:
the Painter Paths example, and the Vector Deformation demo.


drawPicture

public final void drawPicture(QPoint p,
                              QPicture picture)

drawPicture

public final void drawPicture(QPointF p,
                              QPicture picture)
This is an overloaded member function, provided for convenience.

Replays the given picture at the given point.


drawPicture

public final void drawPicture(int x,
                              int y,
                              QPicture picture)
This is an overloaded member function, provided for convenience.

Draws the given picture at point (x, y).


drawPie

public final void drawPie(QRect arg__1,
                          int a,
                          int alen)

drawPie

public final void drawPie(QRectF rect,
                          int a,
                          int alen)
This is an overloaded member function, provided for convenience.

Draws a pie defined by the given rectangle, startAngle and and spanAngle.


drawPie

public final void drawPie(int x,
                          int y,
                          int w,
                          int h,
                          int a,
                          int alen)
This is an overloaded member function, provided for convenience.

Draws the pie defined by the rectangle beginning at (x, y) with the specified width and height, and the given startAngle and spanAngle.


drawPixmap

public final void drawPixmap(QPoint p,
                             QPixmap pm)

drawPixmap

public final void drawPixmap(QPoint p,
                             QPixmap pm,
                             QRect sr)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given pixmap with its origin at the given point.


drawPixmap

public final void drawPixmap(QPointF p,
                             QPixmap pm)
This is an overloaded member function, provided for convenience.

Draws the given pixmap with its origin at the given point.


drawPixmap

public final void drawPixmap(QPointF p,
                             QPixmap pm,
                             QRectF sr)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given pixmap with its origin at the given point.


drawPixmap

public final void drawPixmap(QRect r,
                             QPixmap pm)
This is an overloaded member function, provided for convenience.

Draws the given pixmap into the given rectangle.

Note: The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree.


drawPixmap

public final void drawPixmap(QRect targetRect,
                             QPixmap pixmap,
                             QRect sourceRect)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion source of the given pixmap into the given target in the paint device.

Note: The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree.


drawPixmap

public final void drawPixmap(QRectF targetRect,
                             QPixmap pixmap,
                             QRectF sourceRect)
Draws the rectangular portion source of the given pixmap into the given target in the paint device.

Note: The pixmap is scaled to fit the rectangle, if both the pixmap and rectangle size disagree.

    QRectF target = new QRectF(10.0, 20.0, 80.0, 60.0);
    QRectF source = new QRectF(0.0, 0.0, 70.0, 40.0);
    QPixmap pixmap = new QPixmap("classpath:myPixmap.png");

    QPainter painter = new QPainter(this);
    painter.drawPixmap(target, pixmap, source);
    painter.end();
If pixmap is a QBitmap it is drawn with the bits that are "set" using the pens color. If backgroundMode is Qt::OpaqueMode , the "unset" bits are drawn using the color of the background brush; if backgroundMode is Qt::TransparentMode , the "unset" bits are transparent. Drawing bitmaps with gradient or texture colors is not supported.

See also:
drawImage().


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             QPixmap pm)
This is an overloaded member function, provided for convenience.

Draws the given pixmap at position (x, y).


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             QPixmap pm,
                             int sx,
                             int sy,
                             int sw,
                             int sh)
This is an overloaded member function, provided for convenience.

Draws a pixmap at (x, y) by copying a part of the given pixmap into the paint device.

(x, y) specifies the top-left point in the paint device that is to be drawn onto. (sx, sy) specifies the top-left point in pixmap that is to be drawn. The default is (0, 0).

(sw, sh) specifies the size of the pixmap that is to be drawn. The default, (0, 0) (and negative) means all the way to the bottom-right of the pixmap.


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             int w,
                             int h,
                             QPixmap pm)
This is an overloaded member function, provided for convenience.

Draws the pixmap into the rectangle at position (x, y) with the given width and height.


drawPixmap

public final void drawPixmap(int x,
                             int y,
                             int w,
                             int h,
                             QPixmap pm,
                             int sx,
                             int sy,
                             int sw,
                             int sh)
This is an overloaded member function, provided for convenience.

Draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the given pixmap , at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy;


drawPoint

public final void drawPoint(QPoint p)
This is an overloaded member function, provided for convenience.

Draws a single point at the given position using the current pen's color.


drawPoint

public final void drawPoint(QPointF pt)
Draws a single point at the given position using the current pen's color.

See also:
The Coordinate System.


drawPoint

public final void drawPoint(int x,
                            int y)
This is an overloaded member function, provided for convenience.

Draws a single point at position (x, y).


drawPoints

public final void drawPoints(QPolygon points)
This is an overloaded member function, provided for convenience.

Draws the points in the vector points.


drawPoints

public final void drawPoints(QPolygonF points)
This is an overloaded member function, provided for convenience.

Draws the points in the vector points.


drawPolygon

public final void drawPolygon(QPolygon polygon)
This is an overloaded member function, provided for convenience.

Draws the polygon defined by the given points using the fill rule fillRule.


drawPolygon

public final void drawPolygon(QPolygon polygon,
                              Qt.FillRule fillRule)

drawPolygon

public final void drawPolygon(QPolygonF polygon)
This is an overloaded member function, provided for convenience.

Draws the polygon defined by the given points using the fill rule fillRule.


drawPolygon

public final void drawPolygon(QPolygonF polygon,
                              Qt.FillRule fillRule)
This is an overloaded member function, provided for convenience.

Draws the polygon defined by the given points using the fill rule fillRule.


drawPolyline

public final void drawPolyline(QPolygon polygon)
This is an overloaded member function, provided for convenience.

Draws the polyline defined by the given points using the current pen.


drawPolyline

public final void drawPolyline(QPolygonF polyline)
This is an overloaded member function, provided for convenience.

Draws the polyline defined by the given points using the current pen.


drawRect

public final void drawRect(QRect rect)
This is an overloaded member function, provided for convenience.

Draws the current rectangle with the current pen and brush.


drawRect

public final void drawRect(QRectF rect)
Draws the current rectangle with the current pen and brush.

A filled rectangle has a size of rectangle.size(). A stroked rectangle has a size of rectangle.size() plus the pen width.



        QRectF rectangle = new QRectF(10.0, 20.0, 80.0, 60.0);

        QPainter painter = new QPainter(this);
        painter.drawRect(rectangle);
        painter.end();

See also:
drawRects(), drawPolygon(), and The Coordinate System.


drawRect

public final void drawRect(int x1,
                           int y1,
                           int w,
                           int h)
This is an overloaded member function, provided for convenience.

Draws a rectangle with upper left corner at (x, y) and with the given width and height.


drawRects

public final void drawRects(java.util.List rectangles)
This is an overloaded member function, provided for convenience.

Draws the given rectangles using the current pen and brush.


drawRectsF

public final void drawRectsF(java.util.List rectangles)
This is an overloaded member function, provided for convenience.

Draws the given rectangles using the current pen and brush.


drawRoundRect

public final void drawRoundRect(QRect r,
                                int xround)

drawRoundRect

public final void drawRoundRect(QRect r)
This is an overloaded member function, provided for convenience.

Draws the rectangle r with rounded corners.


drawRoundRect

public final void drawRoundRect(QRect r,
                                int xround,
                                int yround)

drawRoundRect

public final void drawRoundRect(QRectF r,
                                int xround)
This is an overloaded member function, provided for convenience.

Draws the rectangle r with rounded corners.


drawRoundRect

public final void drawRoundRect(QRectF r)
Draws a rectangle r with rounded corners.

The xRnd and yRnd arguments specify how rounded the corners should be. 0 is angled corners, 99 is maximum roundedness.

A filled rectangle has a size of r.size(). A stroked rectangle has a size of r.size() plus the pen width.

See also:
drawRoundedRect().


drawRoundRect

public final void drawRoundRect(QRectF r,
                                int xround,
                                int yround)
This is an overloaded member function, provided for convenience.

Draws the rectangle r with rounded corners.


drawRoundRect

public final void drawRoundRect(int x,
                                int y,
                                int w,
                                int h,
                                int arg__5)
This is an overloaded member function, provided for convenience.

Draws the rectangle x, y, w, h with rounded corners.


drawRoundRect

public final void drawRoundRect(int x,
                                int y,
                                int w,
                                int h)
This is an overloaded member function, provided for convenience.

Draws the rectangle x, y, w, h with rounded corners.


drawRoundRect

public final void drawRoundRect(int x,
                                int y,
                                int w,
                                int h,
                                int arg__5,
                                int arg__6)
This is an overloaded member function, provided for convenience.

Draws the rectangle x, y, w, h with rounded corners.


drawRoundedRect

public final void drawRoundedRect(QRect rect,
                                  double xRadius,
                                  double yRadius)

drawRoundedRect

public final void drawRoundedRect(QRect rect,
                                  double xRadius,
                                  double yRadius,
                                  Qt.SizeMode mode)

drawRoundedRect

public final void drawRoundedRect(QRectF rect,
                                  double xRadius,
                                  double yRadius)
This is an overloaded member function, provided for convenience.

Draws the given rectangle rect with rounded corners.


drawRoundedRect

public final void drawRoundedRect(QRectF rect,
                                  double xRadius,
                                  double yRadius,
                                  Qt.SizeMode mode)
This is an overloaded member function, provided for convenience.

Draws the given rectangle rect with rounded corners.


drawRoundedRect

public final void drawRoundedRect(int x,
                                  int y,
                                  int w,
                                  int h,
                                  double xRadius,
                                  double yRadius)
This is an overloaded member function, provided for convenience.

Draws the given rectangle x, y, w, h with rounded corners.


drawRoundedRect

public final void drawRoundedRect(int x,
                                  int y,
                                  int w,
                                  int h,
                                  double xRadius,
                                  double yRadius,
                                  Qt.SizeMode mode)
This is an overloaded member function, provided for convenience.

Draws the given rectangle x, y, w, h with rounded corners.


drawText

public final void drawText(QPoint p,
                           java.lang.String s)

drawText

public final void drawText(QPointF p,
                           java.lang.String s)
This is an overloaded member function, provided for convenience.

Draws the given text with the currently defined text direction, beginning at the given position.

By default, QPainter draws text anti-aliased.

Note: The y-position is used as the baseline of the font.


drawText

public final void drawText(QRectF r,
                           java.lang.String text)
This is an overloaded member function, provided for convenience.

Draws the given text in the rectangle specified using the option to control its positioning and orientation.

By default, QPainter draws text anti-aliased.

Note: The y-coordinate of rectangle is used as the top of the font.


drawText

public final void drawText(QRectF r,
                           java.lang.String text,
                           QTextOption o)
This is an overloaded member function, provided for convenience.

Draws the given text in the rectangle specified using the option to control its positioning and orientation.

By default, QPainter draws text anti-aliased.

Note: The y-coordinate of rectangle is used as the top of the font.


drawText

public final void drawText(int x,
                           int y,
                           java.lang.String s)
This is an overloaded member function, provided for convenience.

Draws the given text at position (x, y), using the painter's currently defined text direction.

By default, QPainter draws text anti-aliased.

Note: The y-position is used as the baseline of the font.


drawTextItem

public final void drawTextItem(QPoint p,
                               QTextItem ti)

drawTiledPixmap

public final void drawTiledPixmap(QRect arg__1,
                                  QPixmap arg__2)

drawTiledPixmap

public final void drawTiledPixmap(QRect arg__1,
                                  QPixmap arg__2,
                                  QPoint arg__3)
This is an overloaded member function, provided for convenience.

Draws a tiled pixmap, inside the given rectangle with its origin at the given position.


drawTiledPixmap

public final void drawTiledPixmap(QRectF rect,
                                  QPixmap pm)
This is an overloaded member function, provided for convenience.

Draws a tiled pixmap, inside the given rectangle with its origin at the given position.


drawTiledPixmap

public final void drawTiledPixmap(QRectF rect,
                                  QPixmap pm,
                                  QPointF offset)
Draws a tiled pixmap, inside the given rectangle with its origin at the given position.

Calling drawTiledPixmap() is similar to calling drawPixmap() several times to fill (tile) an area with a pixmap, but is potentially much more efficient depending on the underlying window system.

See also:
drawPixmap().


drawTiledPixmap

public final void drawTiledPixmap(int x,
                                  int y,
                                  int w,
                                  int h,
                                  QPixmap arg__5,
                                  int sx)
This is an overloaded member function, provided for convenience.

Draws a tiled pixmap in the specified rectangle.

(x, y) specifies the top-left point in the paint device that is to be drawn onto; with the given width and height. (sx, sy) specifies the top-left point in the pixmap that is to be drawn; this defaults to (0, 0).


drawTiledPixmap

public final void drawTiledPixmap(int x,
                                  int y,
                                  int w,
                                  int h,
                                  QPixmap arg__5)
This is an overloaded member function, provided for convenience.

Draws a tiled pixmap in the specified rectangle.

(x, y) specifies the top-left point in the paint device that is to be drawn onto; with the given width and height. (sx, sy) specifies the top-left point in the pixmap that is to be drawn; this defaults to (0, 0).


drawTiledPixmap

public final void drawTiledPixmap(int x,
                                  int y,
                                  int w,
                                  int h,
                                  QPixmap arg__5,
                                  int sx,
                                  int sy)
This is an overloaded member function, provided for convenience.

Draws a tiled pixmap in the specified rectangle.

(x, y) specifies the top-left point in the paint device that is to be drawn onto; with the given width and height. (sx, sy) specifies the top-left point in the pixmap that is to be drawn; this defaults to (0, 0).


end

public final boolean end()
Ends painting. Any resources used while painting are released. You don't normally need to call this since it is called by the destructor.

Returns true if the painter is no longer active; otherwise returns false.

See also:
begin(), and isActive().


eraseRect

public final void eraseRect(QRect arg__1)
This is an overloaded member function, provided for convenience.

Erases the area inside the given rectangle.


eraseRect

public final void eraseRect(QRectF arg__1)
Erases the area inside the given rectangle. Equivalent to calling
        fillRect(rectangle, background());

See also:
fillRect().


eraseRect

public final void eraseRect(int x,
                            int y,
                            int w,
                            int h)
This is an overloaded member function, provided for convenience.

Erases the area inside the rectangle beginning at (x, y) with the given width and height.


fillPath

public final void fillPath(QPainterPath path,
                           QBrush brush)
Fills the given path using the given brush. The outline is not drawn.

Alternatively, you can specify a QColor instead of a QBrush; the QBrush constructor (taking a QColor argument) will automatically create a solid pattern brush.

See also:
drawPath().


fillRect

public final void fillRect(QRect arg__1,
                           QBrush arg__2)

fillRect

public final void fillRect(QRect arg__1,
                           QColor color)

fillRect

public final void fillRect(QRect r,
                           Qt.BrushStyle style)

fillRect

public final void fillRect(QRect r,
                           Qt.GlobalColor c)

fillRect

public final void fillRect(QRectF arg__1,
                           QBrush arg__2)
This is an overloaded member function, provided for convenience.

Fills the given rectangle with the specified brush.


fillRect

public final void fillRect(QRectF arg__1,
                           QColor color)
This is an overloaded member function, provided for convenience.

Fills the given rectangle with the color specified.


fillRect

public final void fillRect(QRectF r,
                           Qt.BrushStyle style)
This is an overloaded member function, provided for convenience.

Fills the given rectangle with the brush style specified.


fillRect

public final void fillRect(QRectF r,
                           Qt.GlobalColor c)
This is an overloaded member function, provided for convenience.

Fills the given rectangle with the specified color.


fillRect

public final void fillRect(int x,
                           int y,
                           int w,
                           int h,
                           Qt.BrushStyle style)
This is an overloaded member function, provided for convenience.

Fills the rectangle beginning at (x, y) with the given width and height, using the brush style specified.


fillRect

public final void fillRect(int x,
                           int y,
                           int w,
                           int h,
                           Qt.GlobalColor c)
This is an overloaded member function, provided for convenience.

Fills the rectangle beginning at (x, y) with the given width and height, using the given color.


fillRect

public final void fillRect(int x,
                           int y,
                           int w,
                           int h,
                           QBrush arg__5)
This is an overloaded member function, provided for convenience.

Fills the rectangle beginning at (x, y) with the given width and height, using the given brush.


fillRect

public final void fillRect(int x,
                           int y,
                           int w,
                           int h,
                           QColor color)
This is an overloaded member function, provided for convenience.

Fills the rectangle beginning at (x, y) with the given width and height, using the given color.


font

public final QFont font()
Returns the currently set font used for drawing text.

See also:
setFont(), drawText(), and Settings.


fontInfo

public final QFontInfo fontInfo()
Returns the font info for the painter if the painter is active. Otherwise, the return value is undefined.

See also:
font(), isActive(), and Settings.


fontMetrics

public final QFontMetrics fontMetrics()
Returns the font metrics for the painter if the painter is active. Otherwise, the return value is undefined.

See also:
font(), isActive(), and Settings.


hasClipping

public final boolean hasClipping()
Returns true if clipping has been set; otherwise returns false.

See also:
setClipping(), and Clipping.


initFrom

public final void initFrom(QWidget widget)
Initializes the painters pen, background and font to the same as the given widget. Call this function after begin() while the painter is active.

See also:
begin(), and Settings.


isActive

public final boolean isActive()
Returns true if begin() has been called and end() has not yet been called; otherwise returns false.

See also:
begin(), and QPaintDevice::paintingActive().


layoutDirection

public final Qt.LayoutDirection layoutDirection()
Returns the layout direction used by the painter when drawing text.

See also:
setLayoutDirection(), drawText(), and Settings.


opacity

public final double opacity()
Returns the opacity of the painter. The default value is 1.

See also:
setOpacity().


paintEngine

public final QPaintEngine paintEngine()
Returns the paint engine that the painter is currently operating on if the painter is active; otherwise 0.

See also:
isActive().


pen

public final QPen pen()
Returns the painter's current pen.

See also:
setPen(), and Settings.


renderHints

public final QPainter.RenderHints renderHints()
Returns a flag that specifies the rendering hints that are set for this painter.

See also:
setRenderHints(), testRenderHint(), and Rendering Quality.


resetMatrix

public final void resetMatrix()
Resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldMatrix(), setViewport() and setWindow().

It is advisable to use resetTransform() instead of this function to preserve the properties of perspective transformations.

See also:
Coordinate Transformations.


resetTransform

public final void resetTransform()
Resets any transformations that were made using translate(), scale(), shear(), rotate(), setWorldTransform(), setViewport() and setWindow().

See also:
Coordinate Transformations.


restore

public final void restore()
Restores the current painter state (pops a saved state off the stack).

See also:
save().


rotate

public final void rotate(double a)
Rotates the coordinate system the given angle clockwise.

See also:
setWorldMatrix(), and Coordinate Transformations.


save

public final void save()
Saves the current painter state (pushes the state onto a stack). A save() must be followed by a corresponding restore(); the end() function unwinds the stack.

See also:
restore().


scale

public final void scale(double sx,
                        double sy)
Scales the coordinate system by (sx, sy).

See also:
setWorldMatrix(), and Coordinate Transformations.


setBackground

public final void setBackground(QBrush bg)
Sets the background brush of the painter to the given brush.

The background brush is the brush that is filled in when drawing opaque text, stippled lines and bitmaps. The background brush has no effect in transparent background mode (which is the default).

See also:
background(), setBackgroundMode(), and Settings.


setBackgroundMode

public final void setBackgroundMode(Qt.BGMode mode)
Sets the background mode of the painter to the given mode

Qt::TransparentMode (the default) draws stippled lines and text without setting the background pixels. Qt::OpaqueMode fills these space with the current background color.

Note that in order to draw a bitmap or pixmap transparently, you must use QPixmap::setMask().

See also:
backgroundMode(), setBackground(), and Settings.


setBrush

public final void setBrush(Qt.BrushStyle style)
This is an overloaded member function, provided for convenience.

Sets the painter's brush to black color and the specified style.


setBrush

public final void setBrush(QBrush brush)
Sets the painter's brush to the given brush.

The painter's brush defines how shapes are filled.

See also:
brush(), and Settings.


setBrushOrigin

public final void setBrushOrigin(QPoint arg__1)
This is an overloaded member function, provided for convenience.

Sets the brush's origin to the given position.


setBrushOrigin

public final void setBrushOrigin(QPointF arg__1)
Sets the brush origin to position.

The brush origin specifies the (0, 0) coordinate of the painter's brush. This setting only applies to pattern brushes and pixmap brushes.

Note that while the brushOrigin() was necessary to adopt the parent's background for a widget in Qt 3, this is no longer the case since the Qt 4 painter doesn't paint the background unless you explicitly tell it to do so by setting the widget's autoFillBackground property to true.

See also:
brushOrigin(), and Settings.


setBrushOrigin

public final void setBrushOrigin(int x,
                                 int y)
This is an overloaded member function, provided for convenience.

Sets the brush's origin to point (x, y).


setClipPath

public final void setClipPath(QPainterPath path)
Enables clipping, and sets the clip path for the painter to the given path, with the clip operation.

Note that the clip path is specified in logical (painter) coordinates.

See also:
clipPath(), clipRegion(), and Clipping.


setClipPath

public final void setClipPath(QPainterPath path,
                              Qt.ClipOperation op)
Enables clipping, and sets the clip path for the painter to the given path, with the clip operation.

Note that the clip path is specified in logical (painter) coordinates.

See also:
clipPath(), clipRegion(), and Clipping.


setClipRect

public final void setClipRect(QRect arg__1)
This is an overloaded member function, provided for convenience.

Enables clipping, and sets the clip region to the given rectangle using the given clip operation.


setClipRect

public final void setClipRect(QRect arg__1,
                              Qt.ClipOperation op)

setClipRect

public final void setClipRect(QRectF arg__1)
Enables clipping, and sets the clip region to the given rectangle using the given clip operation. The default operation is to replace the current clip rectangle.

Note that the clip rectangle is specified in logical (painter) coordinates.

See also:
clipRegion(), setClipping(), and Clipping.


setClipRect

public final void setClipRect(QRectF arg__1,
                              Qt.ClipOperation op)
This is an overloaded member function, provided for convenience.

Enables clipping, and sets the clip region to the given rectangle using the given clip operation.


setClipRect

public final void setClipRect(int x,
                              int y,
                              int w,
                              int h)
Enables clipping, and sets the clip region to the rectangle beginning at (x, y) with the given width and height.


setClipRect

public final void setClipRect(int x,
                              int y,
                              int w,
                              int h,
                              Qt.ClipOperation op)
Enables clipping, and sets the clip region to the rectangle beginning at (x, y) with the given width and height.


setClipRegion

public final void setClipRegion(QRegion arg__1)
Sets the clip region to the given region using the specified clip operation. The default clip operation is to replace the current clip region.

Note that the clip region is given in logical coordinates.

See also:
clipRegion(), setClipRect(), and Clipping.


setClipRegion

public final void setClipRegion(QRegion arg__1,
                                Qt.ClipOperation op)
Sets the clip region to the given region using the specified clip operation. The default clip operation is to replace the current clip region.

Note that the clip region is given in logical coordinates.

See also:
clipRegion(), setClipRect(), and Clipping.


setClipping

public final void setClipping(boolean enable)
Enables clipping if enable is true, or disables clipping if enable is false.

See also:
hasClipping(), and Clipping.


setCompositionMode

public final void setCompositionMode(QPainter.CompositionMode mode)
Sets the composition mode to the given mode.

Warning: You can only set the composition mode for QPainter objects that operates on a QImage.

See also:
compositionMode().


setFont

public final void setFont(QFont f)
Sets the painter's font to the given font.

This font is used by subsequent drawText() functions. The text color is the same as the pen color.

If you set a font that isn't available, Qt finds a close match. font() will return what you set using setFont() and fontInfo() returns the font actually being used (which may be the same).

See also:
font(), drawText(), and Settings.


setLayoutDirection

public final void setLayoutDirection(Qt.LayoutDirection direction)
Sets the layout direction used by the painter when drawing text, to the specified direction.

See also:
layoutDirection(), drawText(), and Settings.


setOpacity

public final void setOpacity(double opacity)
Sets the opacity of the painter to opacity. The value should be in the range 0.0 to 1.0, where 0.0 is fully transparent and 1.0 is fully opaque.

Opacity set on the painter will apply to all drawing operations individually.

See also:
opacity().


setPen

public final void setPen(Qt.PenStyle style)
This is an overloaded member function, provided for convenience.

Sets the painter's pen to have the given style, width 0 and black color.


setPen

public final void setPen(QColor color)
This is an overloaded member function, provided for convenience.

Sets the painter's pen to have style Qt::SolidLine , width 0 and the specified color.


setPen

public final void setPen(QPen pen)
Sets the painter's pen to be the given pen.

The pen defines how to draw lines and outlines, and it also defines the text color.

See also:
pen(), and Settings.


setRenderHint

public final void setRenderHint(QPainter.RenderHint hint)
Sets the given render hint on the painter if on is true; otherwise clears the render hint.

See also:
setRenderHints(), renderHints(), and Rendering Quality.


setRenderHint

public final void setRenderHint(QPainter.RenderHint hint,
                                boolean on)
Sets the given render hint on the painter if on is true; otherwise clears the render hint.

See also:
setRenderHints(), renderHints(), and Rendering Quality.


setRenderHints

public final void setRenderHints(QPainter.RenderHints hints)
Sets the given render hints on the painter if on is true; otherwise clears the render hints.

See also:
setRenderHint(), renderHints(), and Rendering Quality.


setRenderHints

public final void setRenderHints(QPainter.RenderHints hints,
                                 boolean on)
Sets the given render hints on the painter if on is true; otherwise clears the render hints.

See also:
setRenderHint(), renderHints(), and Rendering Quality.


setTransform

public final void setTransform(QTransform transform)
Sets the world transformation matrix. If combine is true, the specified transform is combined with the current matrix; otherwise it replaces the current matrix.

This function has been added for compatibility with setMatrix(), but as with setMatrix() the preferred method of setting a transformation on the painter is through setWorldTransform().

See also:
transform().


setTransform

public final void setTransform(QTransform transform,
                               boolean combine)
Sets the world transformation matrix. If combine is true, the specified transform is combined with the current matrix; otherwise it replaces the current matrix.

This function has been added for compatibility with setMatrix(), but as with setMatrix() the preferred method of setting a transformation on the painter is through setWorldTransform().

See also:
transform().


setViewTransformEnabled

public final void setViewTransformEnabled(boolean enable)
Enables view transformations if enable is true, or disables view transformations if enable is false.

See also:
viewTransformEnabled(), and Window-Viewport Conversion.


setViewport

public final void setViewport(QRect viewport)
Sets the painter's viewport rectangle to the given rectangle, and enables view transformations.

The viewport rectangle is part of the view transformation. The viewport specifies the device coordinate system. Its sister, the window(), specifies the logical coordinate system.

The default viewport rectangle is the same as the device's rectangle.

See also:
viewport(), viewTransformEnabled(), and Window-Viewport Conversion.


setViewport

public final void setViewport(int x,
                              int y,
                              int w,
                              int h)
This is an overloaded member function, provided for convenience.

Sets the painter's viewport rectangle to be the rectangle beginning at (x, y) with the given width and height.


setWindow

public final void setWindow(QRect window)
Sets the painter's window to the given rectangle, and enables view transformations.

The window rectangle is part of the view transformation. The window specifies the logical coordinate system. Its sister, the viewport(), specifies the device coordinate system.

The default window rectangle is the same as the device's rectangle.

See also:
window(), viewTransformEnabled(), and Window-Viewport Conversion.


setWindow

public final void setWindow(int x,
                            int y,
                            int w,
                            int h)
This is an overloaded member function, provided for convenience.

Sets the painter's window to the rectangle beginning at (x, y) and the given width and height.


setWorldMatrix

public final void setWorldMatrix(QMatrix matrix)
Sets the transformation matrix to matrix and enables transformations.

Note: It is advisable to use setWorldTransform() instead of this function to preserve the properties of perspective transformations.

If combine is true, then matrix is combined with the current transformation matrix; otherwise matrix replaces the current transformation matrix.

If matrix is the identity matrix and combine is false, this function calls setWorldMatrixEnabled(false). (The identity matrix is the matrix where QMatrix::m11() and QMatrix::m22() are 1.0 and the rest are 0.0.)

The following functions can transform the coordinate system without using a QMatrix:

They operate on the painter's worldMatrix() and are implemented like this:
    void rotate(double angle) {
        QMatrix matrix = new QMatrix();
        matrix.rotate(angle);
        setWorldMatrix(matrix, true);
    }
Note that when using setWorldMatrix() function you should always have combine be true when you are drawing into a QPicture. Otherwise it may not be possible to replay the picture with additional transformations; using the translate(), scale(), etc. convenience functions is safe.

For more information about the coordinate system, transformations and window-viewport conversion, see The Coordinate System documentation.

See also:
worldMatrixEnabled(), and QMatrix.


setWorldMatrix

public final void setWorldMatrix(QMatrix matrix,
                                 boolean combine)
Sets the transformation matrix to matrix and enables transformations.

Note: It is advisable to use setWorldTransform() instead of this function to preserve the properties of perspective transformations.

If combine is true, then matrix is combined with the current transformation matrix; otherwise matrix replaces the current transformation matrix.

If matrix is the identity matrix and combine is false, this function calls setWorldMatrixEnabled(false). (The identity matrix is the matrix where QMatrix::m11() and QMatrix::m22() are 1.0 and the rest are 0.0.)

The following functions can transform the coordinate system without using a QMatrix:

They operate on the painter's worldMatrix() and are implemented like this:
    void rotate(double angle) {
        QMatrix matrix = new QMatrix();
        matrix.rotate(angle);
        setWorldMatrix(matrix, true);
    }
Note that when using setWorldMatrix() function you should always have combine be true when you are drawing into a QPicture. Otherwise it may not be possible to replay the picture with additional transformations; using the translate(), scale(), etc. convenience functions is safe.

For more information about the coordinate system, transformations and window-viewport conversion, see The Coordinate System documentation.

See also:
worldMatrixEnabled(), and QMatrix.


setWorldMatrixEnabled

public final void setWorldMatrixEnabled(boolean enabled)
Enables transformations if enable is true, or disables transformations if enable is false. The world transformation matrix is not changed.

See also:
worldMatrixEnabled(), worldMatrix(), and Coordinate Transformations.


setWorldTransform

public final void setWorldTransform(QTransform matrix)
Sets the world transformation matrix. If combine is true, the specified matrix is combined with the current matrix; otherwise it replaces the current matrix.

See also:
worldTransform(), transform(), and setTransform().


setWorldTransform

public final void setWorldTransform(QTransform matrix,
                                    boolean combine)
Sets the world transformation matrix. If combine is true, the specified matrix is combined with the current matrix; otherwise it replaces the current matrix.

See also:
worldTransform(), transform(), and setTransform().


shear

public final void shear(double sh,
                        double sv)
Shears the coordinate system by (sh, sv).

See also:
setWorldMatrix(), and Coordinate Transformations.


strokePath

public final void strokePath(QPainterPath path,
                             QPen pen)
Draws the outline (strokes) the path path with the pen specified by pen

See also.
fillPath(), and Drawing.


testRenderHint

public final boolean testRenderHint(QPainter.RenderHint hint)
Returns true if hint is set; otherwise returns false.

See also:
renderHints(), and setRenderHint().


transform

public final QTransform transform()
Returns the world transformation matrix.

See also:
setTransform().


translate

public final void translate(QPoint offset)
This is an overloaded member function, provided for convenience.

Translates the coordinate system by the given offset.


translate

public final void translate(QPointF offset)
Translates the coordinate system by the given offset; i. . the given offset is added to points.

See also:
setWorldMatrix(), and Coordinate Transformations.


translate

public final void translate(double dx,
                            double dy)
This is an overloaded member function, provided for convenience.

Translates the coordinate system by the vector (dx, dy).


viewTransformEnabled

public final boolean viewTransformEnabled()
Returns true if view transformation is enabled; otherwise returns false.

See also:
setViewTransformEnabled(), and worldMatrix().


viewport

public final QRect viewport()
Returns the viewport rectangle.

See also:
setViewport(), and setViewTransformEnabled().


window

public final QRect window()
Returns the window rectangle.

See also:
setWindow(), and setViewTransformEnabled().


worldMatrix

public final QMatrix worldMatrix()
Returns the world transformation matrix.

It is advisable to use worldTransform() because worldMatrix() does not preserve the properties of perspective transformations.

See also:
setWorldMatrix(), Coordinate Transformations, and The Coordinate System.


worldMatrixEnabled

public final boolean worldMatrixEnabled()
Returns true if world transformation is enabled; otherwise returns false.

See also:
setWorldMatrixEnabled(), worldMatrix(), and The Coordinate System.


worldTransform

public final QTransform worldTransform()
Returns the world transformation matrix.

See also:
setWorldTransform().


restoreRedirected

public static void restoreRedirected(QPaintDeviceInterface device)
Restores the previous redirection for the given device after a call to setRedirected().

See also:
redirected().


setRedirected

public static void setRedirected(QPaintDeviceInterface device,
                                 QPaintDeviceInterface replacement)
Redirects all paint commands for the given paint device, to the replacement device. The optional point offset defines an offset within the source device.

The redirection will not be effective until the begin() function has been called; make sure to call end() for the given device's painter (if any) before redirecting. Call restoreRedirected() to restore the previous redirection.

In general, you'll probably find that calling QPixmap::grabWidget() or QPixmap::grabWindow() is an easier solution.

See also:
redirected(), and restoreRedirected().


setRedirected

public static void setRedirected(QPaintDeviceInterface device,
                                 QPaintDeviceInterface replacement,
                                 QPoint offset)
Redirects all paint commands for the given paint device, to the replacement device. The optional point offset defines an offset within the source device.

The redirection will not be effective until the begin() function has been called; make sure to call end() for the given device's painter (if any) before redirecting. Call restoreRedirected() to restore the previous redirection.

In general, you'll probably find that calling QPixmap::grabWidget() or QPixmap::grabWindow() is an easier solution.

See also:
redirected(), and restoreRedirected().


setBrush

public final void setBrush(QColor color)
Sets the brush of this QPainter to a solid color brush.


setBrush

public final void setBrush(QGradient gradient)
Sets this QPainter's brush to use gradient. gradient


setBrush

public final void setBrush(QPixmap pm)
Sets this QPainter's brush to use pm.


redirected

public static QPaintDeviceInterface redirected(QPaintDeviceInterface device,
                                               QPoint offset)
Returns the replacement for given device. The optional out parameter offset returns the offset within the replaced device.


begin

public boolean begin(QWidget widget)
This method initializes the painter to draw on widget. It returns true if successful; otherwise, it returns false.


drawText

public final void drawText(QRect rectangle,
                           int flags,
                           java.lang.String text,
                           QRect boundingRect)
Draws the given text within the provided rectangle.

The boundingRect (if not null) is set to the actual bounding rectangle of the output. The flags argument is a bitwise OR of Qt.AlignmentFlags.


drawText

public final void drawText(QRect rectangle,
                           int flags,
                           java.lang.String text)

drawText

public final void drawText(QRectF rectangle,
                           int flags,
                           java.lang.String text,
                           QRectF boundingRect)
Draws the given text within the provided rectangle.

The boundingRect (if not null) is set to the actual bounding rectangle of the output. The flags argument is a bitwise OR of Qt.AlignmentFlags.


drawText

public final void drawText(QRectF rectangle,
                           int flags,
                           java.lang.String text)
This is an overloaded function provided for convenience.


drawText

public final void drawText(int x,
                           int y,
                           int width,
                           int height,
                           int flags,
                           java.lang.String text,
                           QRect boundingRect)
Draws the given text within the rectangle with origin (x, y), width and height
.

The boundingRect (if not null) is set to the actual bounding rectangle of the output. The flags argument is a bitwise OR of the following flags:


drawText

public final void drawText(int x,
                           int y,
                           int width,
                           int height,
                           int flags,
                           java.lang.String text)
This is an overloaded method provided for convenience.