Ruler.py 文件源码

def _moveruler(self, evt):
        x, y = self.mouseCoord(evt)
        txtPosX = (self.rulersStartX + x) * 0.5
        txtPosY = (self.rulersStartY + y) * 0.5
        dx = x - self.rulersStartX
        dy = y - self.rulersStartY
        lenruler = (dx**2 + dy**2)**0.5
        lenruler *= self.scale
        self.rulersLen[-1].setPos(txtPosX, txtPosY)
        if lenruler > 1:
            txt = '%.3f' % lenruler
        else:
            txt = '%s' % lenruler
        if self.pAngle.value():
            txt += ';  angle=%.2f DEG' % np.degrees(np.arctan2(-dy, dx))
        self.rulersLen[-1].setText(txt)
        self.rulers[-1].setData(
            (self.rulersStartX, x),
            (self.rulersStartY, y))