[英]Making QGraphicsLineItem less fiddly to drag
如下所示,我創建了一個可拖動的 QGraphicsLineItem。 但問題是選擇線路非常繁瑣。 我想增加線的“選擇半徑”,使其更容易拖動
from PySide import QtGui, QtCore
import sys
class VerticalLine(QtGui.QGraphicsLineItem):
def __init__(self, x , y0 , y1 , parent=None):
super(VerticalLine, self).__init__(x , y0 , x , y1 , parent)
self.setFlag(QtGui.QGraphicsLineItem.ItemIsMovable)
self.setFlag(QtGui.QGraphicsLineItem.ItemSendsGeometryChanges)
self.setCursor(QtCore.Qt.SizeAllCursor)
class Editor(QtGui.QMainWindow):
def __init__(self, parent=None):
super(Editor, self).__init__(parent)
line = VerticalLine( 10 , 10 , 100 )
scene = QtGui.QGraphicsScene()
scene.addItem( line )
view = QtGui.QGraphicsView()
view.setScene( scene )
self.setGeometry( 250 , 250 , 600 , 600 )
self.setCentralWidget(view)
self.show()
if __name__=="__main__":
app=QtGui.QApplication(sys.argv)
myapp = Editor()
sys.exit(app.exec_())
您必須覆蓋 shape() 和 boundingRect() 方法,以便它們返回更大的區域,為此使用 QPainterPathStroker 來創建一個以線為基礎的區域並建立一個寬度。
class VerticalLine(QtGui.QGraphicsLineItem):
def __init__(self, x , y0 , y1 , parent=None):
super(VerticalLine, self).__init__(x , y0 , x , y1 , parent)
self.setFlag(QtGui.QGraphicsLineItem.ItemIsMovable)
self.setFlag(QtGui.QGraphicsLineItem.ItemSendsGeometryChanges)
self.setCursor(QtCore.Qt.SizeAllCursor)
def shape(self):
path = super(VerticalLine, self).shape()
stroker = QtGui.QPainterPathStroker()
stroker.setWidth(20)
return stroker.createStroke(path)
def boundingRect(self):
return self.shape().boundingRect()
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