pyqt graphicsview控件实现鼠标漫游功能
时间: 2024-01-30 22:01:53 浏览: 30
PyQt中的graphicsview控件可以通过实现mousePressEvent()、mouseReleaseEvent()、mouseMoveEvent()方法来实现鼠标漫游功能。具体实现步骤如下:
1. 创建GraphicsView对象和Scene对象,将Scene对象设置给GraphicsView对象。
2. 在GraphicsView对象中重写鼠标事件的三个方法:
(1)mousePressEvent(): 获取鼠标按下的坐标点,并将其设置为起始点;
(2)mouseMoveEvent(): 获取鼠标的移动坐标点,计算出鼠标在视图中移动的距离,并以此来调用setSceneRect()设置场景的滚动区域以实现鼠标漫游功能;
(3)mouseReleaseEvent(): 释放鼠标。
3. 在程序中实例化GraphicsView对象并将其加入主窗口的布局中,即可实现鼠标漫游功能。
具体的代码实现可以参考如下:
from PyQt5.QtWidgets import QGraphicsView, QGraphicsScene, QApplication
from PyQt5.QtCore import Qt
class MyView(QGraphicsView):
def __init__(self, parent=None):
super(MyView, self).__init__(parent)
self.setScene(QGraphicsScene(self))
self.setRenderHint(QPainter.Antialiasing)
def mousePressEvent(self, event):
self.startingPoint = event.pos()
self.setDragMode(QGraphicsView.ScrollHandDrag)
super(MyView, self).mousePressEvent(event)
def mouseMoveEvent(self, event):
currentPoint = event.pos()
difference = currentPoint - self.startingPoint
self.setTransformationAnchor(QGraphicsView.AnchorUnderMouse)
self.translate(difference.x(), difference.y())
self.startingPoint = currentPoint
super(MyView, self).mouseMoveEvent(event)
def mouseReleaseEvent(self, event):
self.setDragMode(QGraphicsView.NoDrag)
super(MyView, self).mouseReleaseEvent(event)
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
view = MyView()
view.setGeometry(100,100,300,200)
view.show()
sys.exit(app.exec_())