lighting.py 文件源码

def setupScene(self):
        self.m_scene.setSceneRect(-300, -200, 600, 460)

        linearGrad = QLinearGradient(QPointF(-100, -100), QPointF(100, 100))
        linearGrad.setColorAt(0, QColor(255, 255, 255))
        linearGrad.setColorAt(1, QColor(192, 192, 255))
        self.setBackgroundBrush(linearGrad)

        radialGrad = QRadialGradient(30, 30, 30)
        radialGrad.setColorAt(0, Qt.yellow)
        radialGrad.setColorAt(0.2, Qt.yellow)
        radialGrad.setColorAt(1, Qt.transparent)

        pixmap = QPixmap(60, 60)
        pixmap.fill(Qt.transparent)

        painter = QPainter(pixmap)
        painter.setPen(Qt.NoPen)
        painter.setBrush(radialGrad)
        painter.drawEllipse(0, 0, 60, 60)
        painter.end()

        self.m_lightSource = self.m_scene.addPixmap(pixmap)
        self.m_lightSource.setZValue(2)

        for i in range(-2, 3):
            for j in range(-2, 3):
                if (i + j) & 1:
                    item = QGraphicsEllipseItem(0, 0, 50, 50)
                else:
                    item = QGraphicsRectItem(0, 0, 50, 50)

                item.setPen(QPen(Qt.black, 1))
                item.setBrush(QBrush(Qt.white))

                effect = QGraphicsDropShadowEffect(self)
                effect.setBlurRadius(8)
                item.setGraphicsEffect(effect)
                item.setZValue(1)
                item.setPos(i * 80, j * 80)
                self.m_scene.addItem(item)
                self.m_items.append(item)