def on_mouseDoubleClick(self, point): # 鼠标双击事件,调用相应的对话框，设置填充颜色、线条颜色或字体
# QMessageBox.warning(self, "debug","on_mouseDoubleClick!")
pointScene = self.view.mapToScene(point) # 转换到Scene坐标
# QGraphicsItem *item=NULL
item = self.scene.itemAt(pointScene, self.view.transform()) # 获取光标下的绘图项
item_type = item.type()
# QMessageBox.warning(self, "debug",str(item_type)+'<==>'+str(QGraphicsLineItem.Type))
if item == None or item_type == None: # 没有绘图项
QMessageBox.warning(self, "debug", "No item found!")
return
# switch (item_type): #绘图项的类型
if item_type == 3: # QGraphicsRectItem.Type: #矩形框
# 强制类型转换
theItem = QGraphicsRectItem(item)
self.setBrushColor(theItem)
return
elif item_type == 4: # QGraphicsEllipseItem.Type: #椭圆和圆都是 QGraphicsEllipseItem
theItem = QGraphicsEllipseItem(item)
self.setBrushColor(theItem)
return
elif item_type == 5: # QGraphicsPolygonItem.Type: #梯形和三角形
theItem = QGraphicsPolygonItem(item)
self.setBrushColor(theItem)
return
elif item_type == 6: # QGraphicsLineItem.Type: #直线，设置线条颜色
theItem = QGraphicsLineItem(item)
pen = theItem.pen()
color = theItem.pen().color()
color = QColorDialog.getColor(color, self, "选择线条颜色")
if color.isValid():
pen.setColor(color)
theItem.setPen(pen)
return
elif item_type == 8: # QGraphicsTextItem.Type: #文字，设置字体
theItem = QGraphicsTextItem(item)
font = theItem.font()
ok = False
font, ok = QFontDialog.getFont(self)
if ok:
theItem.setFont(font)
return
