04-spline_fitter.py 文件源码

def circ(self):
        '''returns a rough estimate of the circumference'''
        if self._circ is None:
            new_pts = si.splev(np.linspace(0, 1, 1000), self.tck, ext=2)
            self._circ = np.sum(np.sqrt(np.sum(np.diff(new_pts, axis=1) ** 2,
                                               axis=0)))
        return self._circ