QSvgRenderer

The QSvgRenderer class is used to draw the contents of SVG files onto paint devices. More

Inheritance diagram of PySide2.QtSvg.QSvgRenderer

Synopsis

Functions

Slots

Signals

Detailed Description

Using QSvgRenderer , Scalable Vector Graphics (SVG) can be rendered onto any QPaintDevice subclass, including QWidget , QImage , and QGLWidget .

QSvgRenderer provides an API that supports basic features of SVG rendering, such as loading and rendering of static drawings, and more interactive features like animation. Since the rendering is performed using QPainter , SVG drawings can be rendered on any subclass of QPaintDevice .

SVG drawings are either loaded when an QSvgRenderer is constructed, or loaded later using the load() functions. Data is either supplied directly as serialized XML, or indirectly using a file name. If a valid file has been loaded, either when the renderer is constructed or at some later time, isValid() returns true; otherwise it returns false. QSvgRenderer provides the render() slot to render the current document, or the current frame of an animated document, using a given painter.

The defaultSize() function provides information about the amount of space that is required to render the currently loaded SVG file. This is useful for paint devices, such as QWidget , that often need to supply a size hint to their parent layout. The default size of a drawing may differ from its visible area, found using the viewBox property.

Animated SVG drawings are supported, and can be controlled with a simple collection of functions and properties:

  • The animated() function indicates whether a drawing contains animation information.

  • The framesPerSecond property contains the rate at which the animation plays.

Finally, the QSvgRenderer class provides the repaintNeeded() signal which is emitted whenever the rendering of the document needs to be updated.

See also

QSvgWidget Qt SVG C++ Classes SVG Viewer Example QPicture

class PySide2.QtSvg.QSvgRenderer([parent=None])

PySide2.QtSvg.QSvgRenderer(contents[, parent=None])

PySide2.QtSvg.QSvgRenderer(contents[, parent=None])

PySide2.QtSvg.QSvgRenderer(filename[, parent=None])

param parent

PySide2.QtCore.QObject

param contents

PySide2.QtCore.QXmlStreamReader

param filename

str

Constructs a new renderer with the given parent .

Constructs a new renderer with the given parent and loads the SVG data using the stream reader specified by contents .

PySide2.QtSvg.QSvgRenderer.animated()
Return type

bool

Returns true if the current document contains animated elements; otherwise returns false.

PySide2.QtSvg.QSvgRenderer.animationDuration()
Return type

int

Returns the number of frames in the animation, or 0 if the current document is not animated.

PySide2.QtSvg.QSvgRenderer.aspectRatioMode()
Return type

AspectRatioMode

This property holds how rendering adheres to the SVG view box aspect ratio.

The accepted modes are:

  • IgnoreAspectRatio (the default): the aspect ratio is ignored and the rendering is stretched to the target bounds.

  • KeepAspectRatio : rendering is centered and scaled as large as possible within the target bounds while preserving aspect ratio.

PySide2.QtSvg.QSvgRenderer.boundsOnElement(id)
Parameters

id – str

Return type

PySide2.QtCore.QRectF

Returns bounding rectangle of the item with the given id . The transformation matrix of parent elements is not affecting the bounds of the element.

PySide2.QtSvg.QSvgRenderer.currentFrame()
Return type

int

This property holds the current frame of the document’s animation, or 0 if the document is not animated.

PySide2.QtSvg.QSvgRenderer.defaultSize()
Return type

PySide2.QtCore.QSize

Returns the default size of the document contents.

PySide2.QtSvg.QSvgRenderer.elementExists(id)
Parameters

id – str

Return type

bool

Returns true if the element with the given id exists in the currently parsed SVG file and is a renderable element.

Note: this method returns true only for elements that can be rendered. Which implies that elements that are considered part of the fill/stroke style properties, e.g. radialGradients even tough marked with “id” attributes will not be found by this method.

PySide2.QtSvg.QSvgRenderer.framesPerSecond()
Return type

int

This property holds the number of frames per second to be shown.

The number of frames per second is 0 if the current document is not animated.

See also

animated()

PySide2.QtSvg.QSvgRenderer.isValid()
Return type

bool

Returns true if there is a valid current document; otherwise returns false.

PySide2.QtSvg.QSvgRenderer.load(contents)
Parameters

contentsPySide2.QtCore.QXmlStreamReader

Return type

bool

Loads the specified SVG in contents , returning true if the content was successfully parsed; otherwise returns false.

The reader will be used from where it currently is positioned. If contents is null , behavior is undefined.

PySide2.QtSvg.QSvgRenderer.load(contents)
Parameters

contentsPySide2.QtCore.QByteArray

Return type

bool

PySide2.QtSvg.QSvgRenderer.load(filename)
Parameters

filename – str

Return type

bool

PySide2.QtSvg.QSvgRenderer.matrixForElement(id)
Parameters

id – str

Return type

PySide2.QtGui.QMatrix

Note

This function is deprecated.

Use transformForElement() instead.

Returns the transformation matrix for the element with the given id . The matrix is a product of the transformation of the element’s parents. The transformation of the element itself is not included.

To find the bounding rectangle of the element in logical coordinates, you can apply the matrix on the rectangle returned from boundsOnElement() .

PySide2.QtSvg.QSvgRenderer.render(p, elementId[, bounds=QRectF()])
Parameters

Renders the given element with elementId using the given painter on the specified bounds . If the bounding rectangle is not specified the SVG element is mapped to the whole paint device.

PySide2.QtSvg.QSvgRenderer.render(p)
Parameters

pPySide2.QtGui.QPainter

Renders the current document, or the current frame of an animated document, using the given painter .

PySide2.QtSvg.QSvgRenderer.render(p, bounds)
Parameters

Renders the current document, or the current frame of an animated document, using the given painter on the specified bounds within the painter. If bounds is not empty, the output will be scaled to fill it, ignoring any aspect ratio implied by the SVG.

PySide2.QtSvg.QSvgRenderer.repaintNeeded()
PySide2.QtSvg.QSvgRenderer.setAspectRatioMode(mode)
Parameters

modeAspectRatioMode

This property holds how rendering adheres to the SVG view box aspect ratio.

The accepted modes are:

  • IgnoreAspectRatio (the default): the aspect ratio is ignored and the rendering is stretched to the target bounds.

  • KeepAspectRatio : rendering is centered and scaled as large as possible within the target bounds while preserving aspect ratio.

PySide2.QtSvg.QSvgRenderer.setCurrentFrame(arg__1)
Parameters

arg__1 – int

This property holds the current frame of the document’s animation, or 0 if the document is not animated.

PySide2.QtSvg.QSvgRenderer.setFramesPerSecond(num)
Parameters

num – int

This property holds the number of frames per second to be shown.

The number of frames per second is 0 if the current document is not animated.

See also

animated()

PySide2.QtSvg.QSvgRenderer.setViewBox(viewbox)
Parameters

viewboxPySide2.QtCore.QRect

PySide2.QtSvg.QSvgRenderer.setViewBox(viewbox)
Parameters

viewboxPySide2.QtCore.QRectF

This property holds the rectangle specifying the visible area of the document in logical coordinates.

PySide2.QtSvg.QSvgRenderer.transformForElement(id)
Parameters

id – str

Return type

PySide2.QtGui.QTransform

Returns the transformation matrix for the element with the given id . The matrix is a product of the transformation of the element’s parents. The transformation of the element itself is not included.

To find the bounding rectangle of the element in logical coordinates, you can apply the matrix on the rectangle returned from boundsOnElement() .

PySide2.QtSvg.QSvgRenderer.viewBox()
Return type

PySide2.QtCore.QRect

Returns viewBoxF() .toRect().

PySide2.QtSvg.QSvgRenderer.viewBoxF()
Return type

PySide2.QtCore.QRectF

This property holds the rectangle specifying the visible area of the document in logical coordinates.