On Mon, 25 Feb 2019 at 19:18, Felix Rubio Dalmau via Interest <interest@qt-project.org> wrote: > > Hi all, > > I am trying to paint a SVG I have on a file on the background of a > QGraphicsScene, and I am facing some issues: if I subclass QGraphicsScene and > in the __init__ method I add: > > self.target = QtSvg.QGraphicsSvgItem(target) > rect = self.target.boundingRect() > self.target.setPos(-rect.width()/2, -rect.height()/2) > self.addItem(self.target) > > So that then in my main window I set the QGraphicsView to do a > fitInView (the size of the widget is 500x500), via > > self.ui.targetView.fitInView(self.scene.sceneRect(), > QtCore.Qt.KeepAspectRatio) > > The result is what expected: a nice, smooth image. > > However, if I try to draw the SVG on the background of the > QGraphicsScene, via: > > self.renderer = QtSvg.QSvgRenderer(target) > rect = self.renderer.defaultSize() > self.image = QtGui.QImage(rect, QtGui.QImage.Format_ARGB32) > self.painter = QtGui.QPainter(self.image) > self.renderer.render(self.painter) > self.setBackgroundBrush(QtGui.QBrush(self.image)) > self.setSceneRect(QtCore.QRectF(QtCore.QPointF(0, 0), > QtCore.QSizeF(self.image.size()))) > > Without doing the scaling the picture looks OK, but after doing the > scaling the picture looks pixelized. How can I fix that? > Also, I have observed that I have to set the scene rectangle, while I > understood that the scene itself would take care of that?
Maybe you have a caching issue, see https://doc.qt.io/qt-5/qgraphicsview.html#cacheMode-prop Maybe as well https://doc.qt.io/qt-5/qgraphicsscene.html#invalidate could help Chris > > Thank you for your help! > Felix > > PS: for reference, the picture is > https://upload.wikimedia.org/wikipedia/commons/1/17/WA_80_cm_archery_target.svg > > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > https://lists.qt-project.org/listinfo/interest _______________________________________________ Interest mailing list Interest@qt-project.org https://lists.qt-project.org/listinfo/interest
