cloudvolume.py 文件源码

def slices_from_global_coords(self, slices):
    """
    Used for converting from mip 0 coordinates to upper mip level
    coordinates. This is mainly useful for debugging since the neuroglancer
    client displays the mip 0 coordinates for your cursor.
    """

    maxsize = list(self.mip_volume_size(0)) + [ self.num_channels ]
    minsize = list(self.mip_voxel_offset(0)) + [ 0 ]

    slices = generate_slices(slices, minsize, maxsize)[:3]
    lower = Vec(*map(lambda x: x.start, slices))
    upper = Vec(*map(lambda x: x.stop, slices))
    step = Vec(*map(lambda x: x.step, slices))

    lower /= self.downsample_ratio
    upper /= self.downsample_ratio

    signs = step / np.absolute(step)
    step = signs * max2(np.absolute(step / self.downsample_ratio), Vec(1,1,1))
    step = Vec(*np.round(step))

    return [
      slice(lower.x, upper.x, step.x),
      slice(lower.y, upper.y, step.y),
      slice(lower.z, upper.z, step.z)
    ]