ArcItem.py 文件源码

def setPolygon(self):
        '''Calculate position and rotation of the arc arrow head.'''
        rotDeg = 0            
        xlength = self.pos1.x() - self.pos2.x()
        ylength = self.pos1.y() - self.pos2.y()
        d = math.sqrt( math.pow( xlength , 2) + math.pow( ylength , 2) )        
        if d > 0:
            beta = math.acos( xlength / d )
            rotDeg = math.degrees( beta ) 

        self.arrowPolygonObject.setPolygon( QtGui.QPolygonF( [
                                                 QtCore.QPointF( (self.pos2.x() -10),  (self.pos2.y() +5)), 
                                                 QtCore.QPointF( (self.pos2.x() -10) , (self.pos2.y() -5)), 
                                                 QtCore.QPointF(       self.pos2.x() ,      self.pos2.y())
                                                 ] ) ) 

        self.arrowPolygonObject.setBrush( QtGui.QBrush(QtCore.Qt.black) )

        """ self.angle()!!!!!!!!!"""
#         self.arcLinePolygon.angle()
#         self.arcLinePolygon.rotate(rotDeg)
#         self.arcLinePolygon.setPos( self.pos2 ) 

    #------------------------------------------------------------------------------------------------