tab_scene.py 文件源码

def addPolyLine(self):
        [[xmin, xmax], [ymin, ymax]] = self.plot.viewRange()
        self.poly_line = pg.PolyLineROI(
            positions=[(xmin+(xmax-xmin)*.4,
                        ymin+(ymax-ymin)*.4),
                       (xmin+(xmax-xmin)*.6,
                        ymin+(ymax-ymin)*.6)],
            pen=pg.mkPen('g', width=2))
        self.plot.addItem(self.poly_line)
        self.updateTransPlot()

        self.poly_line.sigRegionChangeFinished.connect(
            self.updateTransPlot)