base.py 文件源码

def orientArrow(self):
        phi = num.median(self.model.scene.phi)
        theta = num.median(self.model.scene.theta)

        angle = -num.rad2deg(phi)
        theta_f = theta / (num.pi/2)

        tipAngle = 30. + theta_f * 20.
        tailLen = 15 + theta_f * 15.

        self.arrow.setStyle(
            angle=angle,
            tipAngle=tipAngle,
            tailLen=tailLen,
            tailWidth=6,
            headLen=25)
        self.arrow.setRotation(self.arrow.opts['angle'])