def updatePixmap(self, alpha):
        out = self.outPixmap()
        painter = QPainter(out)
        painter.eraseRect(0, 0, out.width(), out.height())
        if alpha < 0.0:
            alpha = -1.0 * alpha
            source = self.startPixmap()
        else:
            source = self.endPixmap()
        painter.setOpacity(alpha)
        painter.drawPixmap(QPoint(0, 0), source)
Update the pixmap for the current transition.
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/q_pixmap_transition.py/QFadeTransition.updatePixmap