Question

我有一个基于PyQt QGraphicsView和QGraphicsScene的查看模型。我在场景中添加了两个项目。那部分运作良好。

但是，当我选择缩放视图时，使用scale(factor,factor) api，左侧项目占用的区域比右侧项目多得多。我希望能够对称地显示两个项目的比例效果。

或者，我希望有两个QGraphicsView实例同时收听wheelEvent（为了集中注意力）和RubberBandDrag函数的事件，以便拥有在所有QGraphicsView个实例上同时进行平移。

这是我正在使用的代码：

class PhotoViewer(QtGui.QGraphicsView):
    photoClicked = QtCore.pyqtSignal(QtCore.QPoint)

    def __init__(self, parent,theLayout):
        super(PhotoViewer, self).__init__(parent)
        self._zoom = 0
        self.layout = theLayout
        self._empty = True
        self.parent = parent
        self._scene = QtGui.QGraphicsScene(self)
        self._photo = QtGui.QGraphicsPixmapItem()
        self._photo1 = QtGui.QGraphicsPixmapItem()
        self._scene.addItem(self._photo)
        self._scene.addItem(self._photo1)
        self.setScene(self._scene)
        self.setTransformationAnchor(QtGui.QGraphicsView.AnchorUnderMouse)
        self.setResizeAnchor(QtGui.QGraphicsView.AnchorUnderMouse)
        self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
        self.setBackgroundBrush(QtGui.QBrush(QtGui.QColor(30, 30, 30)))
        self.setFrameShape(QtGui.QFrame.NoFrame)

    def hasPhoto(self):
        return not self._empty


    def setPhoto(self, pixmap=None):
        self._zoom = 0
        width = self.parent.width()
        height= self.height()
        self._scene.setSceneRect(QRectF(0.0, 0.0, width + 20.0, height))
        if pixmap and not pixmap.isNull():
            self._empty = False
            self.setDragMode(QtGui.QGraphicsView.ScrollHandDrag)
            pixmap =pixmap.scaled(width/2,height)
            self._photo.setPixmap(pixmap)
            image = QPixmap("IMG_1612_02_1120_1542_bp.bmp")
            image = image.scaled(width/2, height)
            self._photo1.setPixmap(image)
            self._photo.setOffset(0,0.0)
            self._photo1.setOffset(width / 2 + 20, 0.0)
            self.scale(1.5, 1.5)

QGraphicsView和QGraphicsScene如何支持多个QGraphicsPixmapItem上的同步缩放和平移？

0 个答案: