sheetview.py 文件源码

def update(self, pos=None):
                path = QPainterPath()

                if pos is not None:
                    if self.ioend is None:
                        startpos = self.iostart.pos() + self.iostart.parent.pos()
                        endpos = pos
                    elif self.iostart is None:
                        startpos = pos
                        endpos = self.ioend.pos() + self.ioend.parent.pos()
                else:
                    startpos = self.iostart.pos() + self.iostart.parent.pos()
                    endpos = self.ioend.pos() + self.ioend.parent.pos()

                controlpoint = QPointF(abs((endpos - startpos).x()) * 0.8, 0)

                path.moveTo(startpos)
                path.cubicTo(startpos + controlpoint,
                             endpos - controlpoint,
                             endpos)

                self.setPath(path)