2dpainting.py 文件源码

def paint(self, painter, event, elapsed):
        painter.fillRect(event.rect(), self.background)
        painter.translate(100, 100)

        painter.save()
        painter.setBrush(self.circleBrush)
        painter.setPen(self.circlePen)
        painter.rotate(elapsed * 0.030)

        r = elapsed / 1000.0
        n = 30
        for i in range(n):
            painter.rotate(30)
            radius = 0 + 120.0*((i+r)/n)
            circleRadius = 1 + ((i+r)/n)*20
            painter.drawEllipse(QRectF(radius, -circleRadius,
                    circleRadius*2, circleRadius*2))

        painter.restore()

        painter.setPen(self.textPen)
        painter.setFont(self.textFont)
        painter.drawText(QRect(-50, -50, 100, 100), Qt.AlignCenter, "Qt")