Paint System

A system for painting on the screen or on print devices using the same API

Qt’s paint system enables painting on screen and print devices using the same API, and is primarily based on the QPainter , QPaintDevice , and QPaintEngine classes.

QPainter is used to perform drawing operations, QPaintDevice is an abstraction of a two-dimensional space that can be painted on using a QPainter , and QPaintEngine provides the interface that the painter uses to draw onto different types of devices. The QPaintEngine class is used internally by QPainter and QPaintDevice , and is hidden from application programmers unless they create their own device type.

The main benefit of this approach is that all painting follows the same painting pipeline making it easy to add support for new features and providing default implementations for unsupported ones.

Topics

• Classes for Painting

• Paint Devices and Backends

• Drawing and Filling

• Coordinate System

• Reading and Writing Image Files

Classes for Painting

These classes provide support for painting onto a paint device.

PySide2.QtGui.QBitmap	The QBitmap class provides monochrome (1-bit depth) pixmaps.
PySide2.QtGui.QIcon	The QIcon class provides scalable icons in different modes and states.
PySide2.QtGui.QIconEngine	The QIconEngine class provides an abstract base class for QIcon renderers.
PySide2.QtGui.QImage	The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.
PySide2.QtGui.QImageReader	The QImageReader class provides a format independent interface for reading images from files or other devices.
PySide2.QtGui.QImageWriter	The QImageWriter class provides a format independent interface for writing images to files or other devices.
PySide2.QtGui.QPictureIO	The QPictureIO class contains parameters for loading and saving pictures.
PySide2.QtGui.QPixmap	The QPixmap class is an off-screen image representation that can be used as a paint device.
PySide2.QtGui.QGenericMatrix	The QGenericMatrix class is a template class that represents a NxM transformation matrix with N columns and M rows.
PySide2.QtGui.QVector2D	The QVector2D class represents a vector or vertex in 2D space.
PySide2.QtGui.QBrush	The QBrush class defines the fill pattern of shapes drawn by QPainter.
PySide2.QtGui.QGradient	The QGradient class is used in combination with QBrush to specify gradient fills.
PySide2.QtGui.QLinearGradient	The QLinearGradient class is used in combination with QBrush to specify a linear gradient brush.
PySide2.QtGui.QRadialGradient	The QRadialGradient class is used in combination with QBrush to specify a radial gradient brush.
PySide2.QtGui.QConicalGradient	The QConicalGradient class is used in combination with QBrush to specify a conical gradient brush.
PySide2.QtGui.QColor	The QColor class provides colors based on RGB, HSV or CMYK values.
PySide2.QtGui.QColorSpace	The QColorSpace class provides a color space abstraction.
QColorTransform	The QColorTransform class is a transformation between color spaces.
PySide2.QtGui.QMatrix	The QMatrix class specifies 2D transformations of a coordinate system.
PySide2.QtGui.QPagedPaintDevice	The QPagedPaintDevice class represents a paint device that supports multiple pages.
PySide2.QtGui.QPaintDevice	The QPaintDevice class is the base class of objects that can be painted on with QPainter.
PySide2.QtGui.QPaintEngine	The QPaintEngine class provides an abstract definition of how QPainter draws to a given device on a given platform.
PySide2.QtGui.QPainter	The QPainter class performs low-level painting on widgets and other paint devices.
PySide2.QtGui.QPainterPath	The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.
PySide2.QtGui.QPainterPathStroker	The QPainterPathStroker class is used to generate fillable outlines for a given painter path.
PySide2.QtGui.QPdfWriter	The QPdfWriter class is a class to generate PDFs that can be used as a paint device.
PySide2.QtGui.QPen	The QPen class defines how a QPainter should draw lines and outlines of shapes.
PySide2.QtGui.QPolygon	The QPolygon class provides a vector of points using integer precision.
PySide2.QtGui.QPolygonF	The QPolygonF class provides a vector of points using floating point precision.
PySide2.QtGui.QRegion	The QRegion class specifies a clip region for a painter.
QRgba64	The QRgba64 struct contains a 64-bit RGB color.
PySide2.QtGui.QTransform	The QTransform class specifies 2D transformations of a coordinate system.
PySide2.QtGui.QFont	The QFont class specifies a query for a font used for drawing text.
PySide2.QtGui.QFontMetrics	The QFontMetrics class provides font metrics information.
PySide2.QtGui.QFontMetricsF	The QFontMetricsF class provides font metrics information.
QSupportedWritingSystems	The QSupportedWritingSystems class is used when registering fonts with the internal Qt fontdatabase.
	The QPlatformFontDatabase class makes it possible to customize how fonts are discovered and how they are rendered
PySide2.QtCore.QLine	The QLine class provides a two-dimensional vector using integer precision.
PySide2.QtCore.QLineF	The QLineF class provides a two-dimensional vector using floating point precision.
PySide2.QtCore.QMargins	The QMargins class defines the four margins of a rectangle.
PySide2.QtCore.QMarginsF	The QMarginsF class defines the four margins of a rectangle.
PySide2.QtCore.QPoint	The QPoint class defines a point in the plane using integer precision.
PySide2.QtCore.QPointF	The QPointF class defines a point in the plane using floating point precision.
PySide2.QtCore.QRect	The QRect class defines a rectangle in the plane using integer precision.
PySide2.QtCore.QRectF	The QRectF class defines a rectangle in the plane using floating point precision.
PySide2.QtCore.QSize	The QSize class defines the size of a two-dimensional object using integer point precision.
PySide2.QtCore.QSizeF	The QSizeF class defines the size of a two-dimensional object using floating point precision.
PySide2.QtSvg.QSvgGenerator	The QSvgGenerator class provides a paint device that is used to create SVG drawings.
PySide2.QtSvg.QSvgRenderer	The QSvgRenderer class is used to draw the contents of SVG files onto paint devices.
PySide2.QtSvg.QSvgWidget	The QSvgWidget class provides a widget that is used to display the contents of Scalable Vector Graphics (SVG) files.
	The QPixmapFilter class provides the basic functionality for pixmap filter classes. Pixmap filter can be for example colorize or blur.
	The QPixmapConvolutionFilter class provides convolution filtering for pixmaps.
	The QPixmapColorizeFilter class provides colorizing filtering for pixmaps.
	The QPixmapDropShadowFilter class is a convenience class for drawing pixmaps with drop shadows.
PySide2.QtWidgets.QStylePainter	The QStylePainter class is a convenience class for drawing QStyle elements inside a widget.
PySide2.QtWidgets.QColormap	The QColormap class maps device independent QColors to device dependent pixel values.