PyQt6/PySide6 的 QPropertyAnimation 类适用场景分析

QGraphicsView (视图)
  └── QGraphicsScene (场景)
      └── QGraphicsItem (图形项：矩形、椭圆、文本、自定义项等)

from PyQt6.QtWidgets import QGraphicsView, QGraphicsScene, QApplication
from PyQt6.QtCore import Qt
scene = QGraphicsScene()  # 创建场景
view = QGraphicsView(scene)  # 创建视图并绑定场景
view.setRenderHint(QPainter.RenderHint.Antialiasing)  # 抗锯齿
view.resize(800, 600)
view.show()

# 添加矩形（位置、大小、颜色）
rect = scene.addRect(0, 0, 100, 50, Qt.GlobalColor.red, Qt.GlobalColor.blue)
# 添加文本
text = scene.addText("Hello Graphics", QFont("Arial", 12))
text.setPos(50, 50)
# 添加椭圆
ellipse = scene.addEllipse(200, 100, 80, 60, Qt.GlobalColor.green)

class MovableRect(QGraphicsRectItem):
    def __init__(self, x, y, w, h):
        super().__init__(x, y, w, h)
        self.setFlag(QGraphicsItem.GraphicsItemFlag.ItemIsMovable)  # 允许拖拽
        self.setFlag(QGraphicsItem.GraphicsItemFlag.ItemIsSelectable)  # 允许选中
        self.setBrush(Qt.GlobalColor.cyan)
# 添加可移动矩形到场景
movable_rect = MovableRect(300, 200, 80, 40)
scene.addItem(movable_rect)

# 鼠标滚轮缩放
def wheelEvent(self, event):
    factor = 1.2 if event.angleDelta().y() > 0 else 0.8
    self.scale(factor, factor)
# 右键拖拽平移
view.setDragMode(QGraphicsView.DragMode.ScrollHandDrag)  # 设置拖拽模式

class ArrowItem(QGraphicsItem):
    def boundingRect(self):
        return QRectF(-10, -5, 20, 10)  # 定义项边界
    def paint(self, painter, option, widget):
        painter.setPen(QPen(Qt.GlobalColor.black, 2))
        painter.drawLine(0, 0, 10, 0)  # 箭头主体
        painter.drawLine(10, 0, 5, -5)  # 箭头尖端
        painter.drawLine(10, 0, 5, 5)
arrow = ArrowItem()
arrow.setPos(400, 300)
scene.addItem(arrow)

# 使用 QPropertyAnimation 移动图形项
from PyQt6.QtCore import QPropertyAnimation
anim = QPropertyAnimation(arrow, b"pos")
anim.setDuration(2000)
anim.setStartValue(QPointF(400, 300))
anim.setEndValue(QPointF(500, 400))
anim.setEasingCurve(QEasingCurve.Type.InOutQuad)
anim.start()

# 检测矩形与其他项的碰撞
colliding_items = rect.collidingItems()
for item in colliding_items:
    item.setBrush(Qt.GlobalColor.yellow)  # 高亮碰撞项

group = QGraphicsItemGroup()
group.addToGroup(rect)
group.addToGroup(text)
group.setRotation(45)  # 整体旋转 45 度
scene.addItem(group)

class CustomScene(QGraphicsScene):
    def mousePressEvent(self, event):
        if event.button() == Qt.MouseButton.LeftButton:
            print(f"Scene 点击位置：{event.scenePos()}")
        super().mousePressEvent(event)

# 将视图坐标 (100, 200) 转换为场景坐标
scene_pos = view.mapToScene(100, 200)

scene.removeItem(rect)
del rect  # 显式删除对象

class DrawingScene(QGraphicsScene):
    def __init__(self):
        super().__init__()
        self.current_item = None
    def mousePressEvent(self, event):
        if event.button() == Qt.MouseButton.LeftButton:
            self.current_item = QGraphicsEllipseItem()
            self.current_item.setRect(event.scenePos().x(), 
                                     event.scenePos().y(), 
                                     0, 0)
            self.addItem(self.current_item)
    def mouseMoveEvent(self, event):
        if self.current_item:
            start_pos = event.buttonDownScenePos(Qt.MouseButton.LeftButton)
            current_pos = event.scenePos()
            self.current_item.setRect(
                start_pos.x(), start_pos.y(),
                current_pos.x() - start_pos.x(),
                current_pos.y() - start_pos.y()
            )
    def mouseReleaseEvent(self, event):
        self.current_item = None
# 使用示例
app = QApplication([])
scene = DrawingScene()
view = QGraphicsView(scene)
view.show()
app.exec()