class QGraphicsSvgItem¶

The QGraphicsSvgItem class is a QGraphicsItem that can be used to render the contents of SVG files. More…

Synopsis¶

Properties¶

elementIdᅟ
maximumCacheSizeᅟ

Methods¶

def __init__()
def elementId()
def isCachingEnabled()
def maximumCacheSize()
def renderer()
def setCachingEnabled()
def setElementId()
def setMaximumCacheSize()
def setSharedRenderer()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description¶

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

QGraphicsSvgItem provides a way of rendering SVG files onto QGraphicsView. QGraphicsSvgItem can be created by passing the SVG file to be rendered to its constructor or by explicit setting a shared QSvgRenderer on it.

Note that setting QSvgRenderer on a QGraphicsSvgItem doesn’t make the item take ownership of the renderer, therefore if using setSharedRenderer() method one has to make sure that the lifetime of the QSvgRenderer object will be at least as long as that of the QGraphicsSvgItem .

QGraphicsSvgItem provides a way of rendering only parts of the SVG files via the setElementId . If setElementId() method is called, only the SVG element (and its children) with the passed id will be renderer. This provides a convenient way of selectively rendering large SVG files that contain a number of discrete elements. For example the following code renders only jokers from a SVG file containing a whole card deck:

renderer = QSvgRenderer("SvgCardDeck.svg")
black = QGraphicsSvgItem()
red = QGraphicsSvgItem()
black.setSharedRenderer(renderer)
black.setElementId("black_joker")
red.setSharedRenderer(renderer)
red.setElementId("red_joker")

Size of the item can be set via direct manipulation of the items transformation matrix.

By default the SVG rendering is cached using QGraphicsItem::DeviceCoordinateCache mode to speedup the display of items. Caching can be disabled by passing QGraphicsItem::NoCache to the QGraphicsItem::setCacheMode() method.

See also

QSvgWidget Qt SVG C++ Classes QGraphicsItemQGraphicsView

Note

Properties can be used directly when from __feature__ import true_property is used or via accessor functions otherwise.

property elementIdᅟ: str¶

This property holds the element’s XML ID.

Access functions:

elementId()
setElementId()

property maximumCacheSizeᅟ: QSize¶

This property holds the maximum size of the device coordinate cache for this item.

Access functions:

maximumCacheSize()
setMaximumCacheSize()

__init__([parentItem=None])¶

Parameters:: parentItem – QGraphicsItem

Constructs a new SVG item with the given parent.

__init__(fileName[, parentItem=None])

Parameters:

fileName – str
parentItem – QGraphicsItem

Constructs a new item with the given parent and loads the contents of the SVG file with the specified fileName.

elementId()¶

Return type:: str

Returns the XML ID the element that is currently being rendered. Returns an empty string if the whole file is being rendered.

See also

setElementId()

Getter of property elementIdᅟ .

isCachingEnabled()¶

Return type:: bool

Use QGraphicsItem::cacheMode() instead.

maximumCacheSize()¶

Return type:: QSize

Returns the current maximum size of the device coordinate cache for this item. If the item is cached using QGraphicsItem::DeviceCoordinateCache mode, caching is bypassed if the extension of the item in device coordinates is larger than the maximum size.

The default maximum cache size is 1024x768. QPixmapCache::cacheLimit() gives the cumulative bounds of the whole cache, whereas maximumCacheSize() refers to a maximum cache size for this particular item.

See also

setMaximumCacheSize() cacheMode()

Getter of property maximumCacheSizeᅟ .

renderer()¶

Return type:: QSvgRenderer

Returns the currently use QSvgRenderer .

setCachingEnabled(arg__1)¶

Parameters:: arg__1 – bool

Use QGraphicsItem::setCacheMode() instead. Passing true to this function is equivalent to QGraphicsItem::setCacheMode(QGraphicsItem::DeviceCoordinateCache).

See also

isCachingEnabled()

setElementId(id)¶

Parameters:: id – str

Sets the XML ID of the element to id.

See also

elementId()

Setter of property elementIdᅟ .

setMaximumCacheSize(size)¶

Parameters:: size – QSize

Sets the maximum device coordinate cache size of the item to size. If the item is cached using QGraphicsItem::DeviceCoordinateCache mode, caching is bypassed if the extension of the item in device coordinates is larger than size.

The cache corresponds to the QPixmap which is used to cache the results of the rendering. Use QPixmapCache::setCacheLimit() to set limitations on the whole cache and use setMaximumCacheSize() when setting cache size for individual items.

See also

maximumCacheSize() cacheMode()

Setter of property maximumCacheSizeᅟ .

setSharedRenderer(renderer)¶

Parameters:: renderer – QSvgRenderer

Sets renderer to be a shared QSvgRenderer on the item. By using this method one can share the same QSvgRenderer on a number of items. This means that the SVG file will be parsed only once. QSvgRenderer passed to this method has to exist for as long as this item is used.