[PyQt] Re: dragging a QGraphicsSvgItem
melkor at orangepalantir.org
Wed Mar 18 11:45:15 GMT 2009
On Wed, 2009-03-18 at 09:15 +0000, pyqt-request at riverbankcomputing.com
> From: Wolfgang Rohdewald <wolfgang at rohdewald.de>
> Subject: [PyQt] dragging a QGraphicsSvgItem
> To: pyqt at riverbankcomputing.com
> Message-ID: <200903180430.09934.wolfgang at rohdewald.de>
> Content-Type: text/plain; charset="us-ascii"
> While dragging it, I want to see the whole image of the item move.
> What works is something like this:
> (code goes into class Tile(QGraphicsSvgItem), def mousePressEvent)
> pmapSize = self.tileset.tileSize.toSize()
> if self.pixmap is None or self.pixmap.size() != pmapSize:
> self.pixmap = QPixmap(pmapSize)
> painter = QPainter(self.pixmap)
> QGraphicsSvgItem.paint(self, painter,
> for item in self.childItems():
> QGraphicsSvgItem.paint(item, painter,
> but I do not want to render a SVG that is already rendered
> Is there any way I can avoid rendering this item twice? Did I overlook
> a QGraphicsSvgItem method that would return its rendered pixmap?
I use a graphics scene and I never have to explicitly paint anything.
It seems like you could create a pixmap item when you load the svg then
you wouldn't have to render it again later.
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