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QPainter.eraseRect(QRectF)
QPainter.eraseRect(QRect)
QPainter.eraseRect(int, int, int, int)

src/m/a/matplotlib-1.3.1/lib/matplotlib/backends/backend_qt4agg.py   matplotlib(Download)
            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))