QGraphicsSvgItem¶
The
QGraphicsSvgItem
class is aQGraphicsItem
that can be used to render the contents of SVG files. More…
Synopsis¶
Functions¶
def
elementId
()def
isCachingEnabled
()def
maximumCacheSize
()def
renderer
()def
setCachingEnabled
(arg__1)def
setElementId
(id)def
setMaximumCacheSize
(size)def
setSharedRenderer
(renderer)
Detailed Description¶
QGraphicsSvgItem
provides a way of rendering SVG files ontoQGraphicsView
.QGraphicsSvgItem
can be created by passing the SVG file to be rendered to its constructor or by explicit setting a sharedQSvgRenderer
on it.Note that setting
QSvgRenderer
on aQGraphicsSvgItem
doesn’t make the item take ownership of the renderer, therefore if usingsetSharedRenderer()
method one has to make sure that the lifetime of theQSvgRenderer
object will be at least as long as that of theQGraphicsSvgItem
.
QGraphicsSvgItem
provides a way of rendering only parts of the SVG files via thesetElementId
. IfsetElementId()
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:QSvgRenderer *renderer = new QSvgRenderer(QLatin1String("SvgCardDeck.svg")); QGraphicsSvgItem *black = new QGraphicsSvgItem(); QGraphicsSvgItem *red = new QGraphicsSvgItem(); black->setSharedRenderer(renderer); black->setElementId(QLatin1String("black_joker")); red->setSharedRenderer(renderer); red->setElementId(QLatin1String("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
DeviceCoordinateCache
mode to speedup the display of items. Caching can be disabled by passingNoCache
to thesetCacheMode()
method.See also
QSvgWidget
Qt SVG C++ ClassesQGraphicsItem
QGraphicsView
-
class
QGraphicsSvgItem
([parentItem=None])¶ QGraphicsSvgItem(fileName[, parentItem=None])
- param fileName
unicode
- param parentItem
QGraphicsItem
Constructs a new SVG item with the given
parent
.Constructs a new item with the given
parent
and loads the contents of the SVG file with the specifiedfileName
.
-
PySide2.QtSvg.QGraphicsSvgItem.
elementId
()¶ - Return type
unicode
Returns the XML ID the element that is currently being rendered. Returns an empty string if the whole file is being rendered.
See also
-
PySide2.QtSvg.QGraphicsSvgItem.
isCachingEnabled
()¶ - Return type
bool
Use
cacheMode()
instead.
-
PySide2.QtSvg.QGraphicsSvgItem.
maximumCacheSize
()¶ - Return type
QSize
Returns the current maximum size of the device coordinate cache for this item. If the item is cached using
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.
cacheLimit()
gives the cumulative bounds of the whole cache, whereas refers to a maximum cache size for this particular item.See also
setMaximumCacheSize()
cacheMode()
-
PySide2.QtSvg.QGraphicsSvgItem.
renderer
()¶ - Return type
Returns the currently use
QSvgRenderer
.
-
PySide2.QtSvg.QGraphicsSvgItem.
setCachingEnabled
(arg__1)¶ - Parameters
arg__1 –
bool
Use
setCacheMode()
instead. Passing true to this function is equivalent tosetCacheMode
(DeviceCoordinateCache
).See also
-
PySide2.QtSvg.QGraphicsSvgItem.
setElementId
(id)¶ - Parameters
id – unicode
Sets the XML ID of the element to
id
.See also
-
PySide2.QtSvg.QGraphicsSvgItem.
setMaximumCacheSize
(size)¶ - Parameters
size –
QSize
Sets the maximum device coordinate cache size of the item to
size
. If the item is cached usingDeviceCoordinateCache
mode, caching is bypassed if the extension of the item in device coordinates is larger thansize
.The cache corresponds to the
QPixmap
which is used to cache the results of the rendering. UsesetCacheLimit()
to set limitations on the whole cache and use when setting cache size for individual items.See also
maximumCacheSize()
cacheMode()
- Parameters
renderer –
QSvgRenderer
Sets
renderer
to be a sharedQSvgRenderer
on the item. By using this method one can share the sameQSvgRenderer
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.
© 2018 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.