QSvgRenderer ¶

概要 ¶

详细描述 ¶

使用 QSvgRenderer , Scalable Vector Graphics (SVG) can be rendered onto any QPaintDevice subclass, including QWidget , QImage ，和 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.

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 特性。

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

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

• 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.

另请参阅

QSvgWidget Qt SVG C++ 类 SVG 查看器范例 QPicture

class QSvgRenderer ( [ parent=None ] ) ¶

QSvgRenderer(contents[, parent=None])

QSvgRenderer(contents[, parent=None])

QSvgRenderer(filename[, parent=None])

param parent

QObject

param contents

QXmlStreamReader

param filename

unicode

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 ( ) ¶

返回类型

bool

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

另请参阅

framesPerSecond()

PySide2.QtSvg.QSvgRenderer. animationDuration ( ) ¶

返回类型

int

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

另请参阅

animated() framesPerSecond

PySide2.QtSvg.QSvgRenderer. aspectRatioMode ( ) ¶

返回类型

AspectRatioMode

另请参阅

setAspectRatioMode()

PySide2.QtSvg.QSvgRenderer. boundsOnElement ( id ) ¶

参数

id – unicode

返回类型

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.

另请参阅

transformForElement()

PySide2.QtSvg.QSvgRenderer. currentFrame ( ) ¶

返回类型

int

PySide2.QtSvg.QSvgRenderer. defaultSize ( ) ¶

返回类型

QSize

Returns the default size of the document contents.

PySide2.QtSvg.QSvgRenderer. elementExists ( id ) ¶

参数

id – unicode

返回类型

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 ( ) ¶

返回类型

int

另请参阅

setFramesPerSecond()

PySide2.QtSvg.QSvgRenderer. isValid ( ) ¶

返回类型

bool

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

PySide2.QtSvg.QSvgRenderer. load ( contents ) ¶

参数

contents – QXmlStreamReader

返回类型

bool

Loads the specified SVG in contents ，返回 true 若内容被成功剖析；否则返回 false。

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

PySide2.QtSvg.QSvgRenderer. load ( contents ) ¶

参数

contents – QByteArray

返回类型

bool

PySide2.QtSvg.QSvgRenderer. load ( filename ) ¶

参数

filename – unicode

返回类型

bool

PySide2.QtSvg.QSvgRenderer. matrixForElement ( id ) ¶

参数

id – unicode

返回类型

QMatrix

注意

此函数被弃用。

使用 transformForElement() 代替。

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() .

另请参阅

boundsOnElement()

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

参数

• p – QPainter

• elementId – unicode

• bounds – QRectF

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 ) ¶

参数

p – QPainter

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

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

参数

• p – QPainter

• bounds – QRectF

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 ) ¶

参数

mode – AspectRatioMode

另请参阅

aspectRatioMode()

PySide2.QtSvg.QSvgRenderer. setCurrentFrame ( arg__1 ) ¶

参数

arg__1 – int

PySide2.QtSvg.QSvgRenderer. setFramesPerSecond ( num ) ¶

参数

num – int

另请参阅

framesPerSecond()

PySide2.QtSvg.QSvgRenderer. setViewBox ( viewbox ) ¶

参数

viewbox – QRect

PySide2.QtSvg.QSvgRenderer. setViewBox ( viewbox ) ¶

参数

viewbox – QRectF

PySide2.QtSvg.QSvgRenderer. transformForElement ( id ) ¶

参数

id – unicode

返回类型

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() .

另请参阅

boundsOnElement()

PySide2.QtSvg.QSvgRenderer. viewBox ( ) ¶

返回类型

QRect

返回 viewBoxF() .toRect().

另请参阅

setViewBox() viewBoxF()

PySide2.QtSvg.QSvgRenderer. viewBoxF ( ) ¶

返回类型

QRectF