QGraphicsScene 中 Qrubberband 的错误渲染
Bad rendering of Qrubberband in QGraphicsScene
我的 q qrubberband 显示不正确,我认为想要的坐标没问题:
class Viewer(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.graphicsView = QtWidgets.QGraphicsView()
self.hbox = QtWidgets.QVBoxLayout()
self.scene = Scene(self)
self.splitter = QtWidgets.QSplitter()
self.splitter.addWidget(self.graphicsView)
self.widget.setLayout(self.hbox)
self.setCentralWidget(self.widget)
我在场景中加载了一个像素图:
def open_picture(self):
self.scene.setSceneRect(0, 0, self.pixmap.width(), self.pixmap.height())
self.scene.addPixmap(self.pixmap)
self.graphicsView.setScene(self.scene)
self.graphicsView.show()
我有从 QGraphicsScene 继承的场景,主要是在场景中处理一个 qrubberband
class Scene(QtWidgets.QGraphicsScene):
def __init__(self, parent=None):
super(Scene, self).__init__(parent)
def mousePressEvent(self, event):
self.originQPoint = event.scenePos()
self.originQPoint = self.originQPoint.toPoint()
self.currentQRubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle)
def mouseMoveEvent(self, event):
self.currentQRubberBand.setGeometry(QtCore.QRect(self.originQPoint, event.scenePos().toPoint()).normalized())
self.currentQRubberBand.show()
def mouseReleaseEvent(self, event):
print(self.items)
self.currentQRubberBand.hide()
self.currentQRect = self.currentQRubberBand.geometry()
print(self.currentQRect)
我的问题是我的笔记本电脑屏幕上显示的是矩形,但坐标没问题(场景坐标)
如何在不更改 self.currentQRect 值的情况下正确绘制场景中的橡皮筋?
根据 docs:
QPointF QGraphicsSceneMouseEvent::scenePos() const
Returns the mouse cursor position in scene coordinates.
从上面我们可以得出结论,我们得到的点是相对于场景的,而不是相对于屏幕的,所以这不是我们想要的。
使用方法是screenPos()
:
QPoint QGraphicsSceneMouseEvent::screenPos() const
Returns the mouse cursor position in screen coordinates.
通过以上我们得到如下代码:
class Scene(QtWidgets.QGraphicsScene):
def __init__(self, parent=None):
super(Scene, self).__init__(parent)
def mousePressEvent(self, event):
self.originQPoint = event.screenPos()
self.currentQRubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle)
self.originCropPoint = event.scenePos()
def mouseMoveEvent(self, event):
self.currentQRubberBand.setGeometry(QtCore.QRect(self.originQPoint, event.screenPos()))
self.currentQRubberBand.show()
def mouseReleaseEvent(self, event):
self.currentQRubberBand.hide()
currentQRect = self.currentQRubberBand.geometry()
self.currentQRect = QtCore.QRect(self.originCropPoint.toPoint(), event.scenePos().toPoint())
print(self.currentQRect)
我的 q qrubberband 显示不正确,我认为想要的坐标没问题:
class Viewer(QtWidgets.QMainWindow):
def __init__(self):
super().__init__()
self.graphicsView = QtWidgets.QGraphicsView()
self.hbox = QtWidgets.QVBoxLayout()
self.scene = Scene(self)
self.splitter = QtWidgets.QSplitter()
self.splitter.addWidget(self.graphicsView)
self.widget.setLayout(self.hbox)
self.setCentralWidget(self.widget)
我在场景中加载了一个像素图:
def open_picture(self):
self.scene.setSceneRect(0, 0, self.pixmap.width(), self.pixmap.height())
self.scene.addPixmap(self.pixmap)
self.graphicsView.setScene(self.scene)
self.graphicsView.show()
我有从 QGraphicsScene 继承的场景,主要是在场景中处理一个 qrubberband
class Scene(QtWidgets.QGraphicsScene):
def __init__(self, parent=None):
super(Scene, self).__init__(parent)
def mousePressEvent(self, event):
self.originQPoint = event.scenePos()
self.originQPoint = self.originQPoint.toPoint()
self.currentQRubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle)
def mouseMoveEvent(self, event):
self.currentQRubberBand.setGeometry(QtCore.QRect(self.originQPoint, event.scenePos().toPoint()).normalized())
self.currentQRubberBand.show()
def mouseReleaseEvent(self, event):
print(self.items)
self.currentQRubberBand.hide()
self.currentQRect = self.currentQRubberBand.geometry()
print(self.currentQRect)
我的问题是我的笔记本电脑屏幕上显示的是矩形,但坐标没问题(场景坐标)
如何在不更改 self.currentQRect 值的情况下正确绘制场景中的橡皮筋?
根据 docs:
QPointF QGraphicsSceneMouseEvent::scenePos() const
Returns the mouse cursor position in scene coordinates.
从上面我们可以得出结论,我们得到的点是相对于场景的,而不是相对于屏幕的,所以这不是我们想要的。
使用方法是screenPos()
:
QPoint QGraphicsSceneMouseEvent::screenPos() const
Returns the mouse cursor position in screen coordinates.
通过以上我们得到如下代码:
class Scene(QtWidgets.QGraphicsScene):
def __init__(self, parent=None):
super(Scene, self).__init__(parent)
def mousePressEvent(self, event):
self.originQPoint = event.screenPos()
self.currentQRubberBand = QtWidgets.QRubberBand(QtWidgets.QRubberBand.Rectangle)
self.originCropPoint = event.scenePos()
def mouseMoveEvent(self, event):
self.currentQRubberBand.setGeometry(QtCore.QRect(self.originQPoint, event.screenPos()))
self.currentQRubberBand.show()
def mouseReleaseEvent(self, event):
self.currentQRubberBand.hide()
currentQRect = self.currentQRubberBand.geometry()
self.currentQRect = QtCore.QRect(self.originCropPoint.toPoint(), event.scenePos().toPoint())
print(self.currentQRect)