QGraphicsPixmapItem放置不正确

问题描述

我需要将QGraphicsPixmapItem移过图像左上角的圆圈。也就是说,当我用鼠标抓住圆圈时,我需要图像的左上角跟随圆圈。我将QGraphicsEllipseItem子类化,并重新实现了itemChange方法,但是当我将图像的位置设置为该值时,图像的位置不正确。我应该在我的代码中修改什么?

    import sys
    from PyQt5.QtWidgets import QMainWindow,QApplication,QGraphicsView
    from PyQt5 import QtGui,QtWidgets
    
    class MainWindow(QMainWindow):
        def __init__(self,parent=None):
            super(MainWindow,self).__init__(parent)
    
            self.scene = Scene()
            self.view = QGraphicsView(self)
            self.setGeometry(10,30,850,600)
            self.view.setGeometry(20,22,800,550)
            self.view.setScene(self.scene)
    
    class Scene(QtWidgets.QGraphicsScene):
        def __init__(self,parent=None):
            super(Scene,self).__init__(parent)
            # other stuff here
            self.set_image()
    
        def set_image(self):
            image = Image()
            self.addItem(image)
            image.set_pixmap()
    
    class Image(QtWidgets.QGraphicsPixmapItem):
        def __init__(self,parent=None):
            super(Image,self).__init__(parent)
    
            self.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable,True)
    
        def set_pixmap(self):
            pixmap = QtGui.QPixmap("image.jpg")
            self.setPixmap(pixmap)
            self.pixmap_controller = PixmapController(self)
            self.pixmap_controller.set_pixmap_controller()
            self.pixmap_controller.setPos(self.boundingRect().topLeft())
            self.pixmap_controller.setFlag(QtWidgets.QGraphicsItem.ItemSendsScenePositionChanges,True)
    
        def change_image_position(self,position):
            self.setPos(position)
    
    class PixmapController(QtWidgets.QGraphicsEllipseItem):
        def __init__(self,pixmap):
            super(PixmapController,self).__init__(parent=pixmap)
            self.pixmap = pixmap
    
            self.setFlag(QtWidgets.QGraphicsItem.ItemIsMovable,True)
            color = QtGui.QColor(0,0)
            brush = QtGui.QBrush(color)
            self.setBrush(brush)
    
        def set_pixmap_controller(self):
            self.setRect(-5,-5,10,10)
    
        def itemChange(self,change,value):
            if change == QtWidgets.QGraphicsItem.ItemPositionChange:
                self.pixmap.change_image_position(value)
            return super(PixmapController,self).itemChange(change,value)
    
    if __name__ == "__main__":
        app = QApplication(sys.argv)
        window = MainWindow()
        window.show()
        sys.exit(app.exec_())

解决方法

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