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Qt4 clear before draw #2449

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Merged
merged 1 commit into from
Sep 23, 2013
Merged

Qt4 clear before draw #2449

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6 changes: 6 additions & 0 deletions lib/matplotlib/backends/backend_qt4agg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -102,10 +102,16 @@ def paintEvent( self, e ):

refcnt = sys.getrefcount(stringBuffer)

# convert the Agg rendered image -> qImage
qImage = QtGui.QImage(stringBuffer, self.renderer.width,
self.renderer.height,
QtGui.QImage.Format_ARGB32)
# get the rectangle for the image
rect = qImage.rect()
p = QtGui.QPainter(self)
# reset the image area of the canvas to be the back-ground color
p.eraseRect(rect)
# draw the rendered image on to the canvas
p.drawPixmap(QtCore.QPoint(0, 0), QtGui.QPixmap.fromImage(qImage))

# draw the zoom rectangle to the QPainter
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