SplineObject.py 文件源码

def _unravel_flat_index(self, i):
        """Unravels a flat index i to multi-indexes.

        :param i: Flat index
        :type i: int or slice
        :rtype: Tuple of np.array
        :raises IndexError: If the index is out of bounds
        """
        # i is int => make sure we deal with negative i properly
        # i is slice => use i.indices to compute the actual indices
        total = len(self)
        if isinstance(i, int):
            indexes = [i] if i >= 0 else [total + i]
        else:
            indexes = list(range(*i.indices(total)))

        # Convert to multi-indexes
        try:
            unraveled = np.unravel_index(indexes, self.controlpoints.shape[:-1], order='F')
        except ValueError:
            raise IndexError

        return unraveled