向 QGraphicsItem 添加渐变渐变

Question

如何将 QLinearGradient() 添加到 Qrect()。我只能添加纯色 Qt.black 等。示例代码：

class ItemClass(QGraphicsItem):
    def __init__()
        super(ItemClass, self).__init__()
           # 

    def boundingRect(self):
        return QRectF(x, y, w, h)

    def paint(self, painter, opt, w):
        rec = self.boundingRect()
        painter.fillRect(rec, #Here I need gradient ramp)

Answer 1

可以直接传QLinearGradient如下图：

class ItemClass(QGraphicsItem):
    def boundingRect(self):
        x, y, w, h = -25, -25, 50, 50
        return QRectF(x, y, w, h)

    def paint(self, painter, opt, w):
        rect = self.boundingRect()
        lgrad = QLinearGradient(rect.topLeft(), rect.bottomLeft())
        lgrad.setColorAt(0.0, Qt.red);
        lgrad.setColorAt(1.0, Qt.yellow)
        painter.fillRect(rect, lgrad)