QGraphicsView (視圖)
  └── QGraphicsScene (場(chǎng)景)
      └── QGraphicsItem (圖形項(xiàng)：矩形、橢圓、文本、自定義項(xiàng)等)

from PyQt6.QtWidgets import QGraphicsView, QGraphicsScene, QApplication
from PyQt6.QtCore import Qt
scene = QGraphicsScene()  # 創(chuàng)建場(chǎng)景
view = QGraphicsView(scene)  # 創(chuàng)建視圖并綁定場(chǎng)景
view.setRenderHint(QPainter.RenderHint.Antialiasing)  # 抗鋸齒
view.resize(800, 600)
view.show()

# 添加矩形（位置、大小、顏色）
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)
# 添加橢圓
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)  # 允許拖拽
        self.setFlag(QGraphicsItem.GraphicsItemFlag.ItemIsSelectable)  # 允許選中
        self.setBrush(Qt.GlobalColor.cyan)
# 添加可移動(dòng)矩形到場(chǎng)景
movable_rect = MovableRect(300, 200, 80, 40)
scene.addItem(movable_rect)

# 鼠標(biāo)滾輪縮放
def wheelEvent(self, event):
    factor = 1.2 if event.angleDelta().y() > 0 else 0.8
    self.scale(factor, factor)
# 右鍵拖拽平移
view.setDragMode(QGraphicsView.DragMode.ScrollHandDrag)  # 設(shè)置拖拽模式

class ArrowItem(QGraphicsItem):
    def boundingRect(self):
        return QRectF(-10, -5, 20, 10)  # 定義項(xiàng)邊界
    def paint(self, painter, option, widget):
        painter.setPen(QPen(Qt.GlobalColor.black, 2))
        painter.drawLine(0, 0, 10, 0)  # 箭頭主體
        painter.drawLine(10, 0, 5, -5)  # 箭頭尖端
        painter.drawLine(10, 0, 5, 5)
arrow = ArrowItem()
arrow.setPos(400, 300)
scene.addItem(arrow)

# 使用 QPropertyAnimation 移動(dòng)圖形項(xiàng)
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()

# 檢測(cè)矩形與其他項(xiàng)的碰撞
colliding_items = rect.collidingItems()
for item in colliding_items:
    item.setBrush(Qt.GlobalColor.yellow)  # 高亮碰撞項(xiàng)

group = QGraphicsItemGroup()
group.addToGroup(rect)
group.addToGroup(text)
group.setRotation(45)  # 整體旋轉(zhuǎn) 45 度
scene.addItem(group)

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

# 將視圖坐標(biāo) (100, 200) 轉(zhuǎn)換為場(chǎng)景坐標(biāo)
scene_pos = view.mapToScene(100, 200)

scene.removeItem(rect)
del rect  # 顯式刪除對(duì)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()