skimage2.draw.disk#

skimage2.draw.disk(center, radius, *, shape=None)[source]#

Generate coordinates of pixels within circle.

Parameters:

centertuple: Center coordinate of disk.
radiusdouble: Radius of disk.
shapetuple, optional: Image shape as a tuple of size 2. Determines the maximum extent of output pixel coordinates. This is useful for disks that exceed the image size. If None, the full extent of the disk is used. The shape might result in negative coordinates and wraparound behaviour.

Returns:

rr, ccndarray of int: Pixel coordinates of disk. May be used to directly index into an array, e.g. img[rr, cc] = 1.

Examples

>>> import numpy as np
>>> from _skimage2.draw import disk
>>> shape = (4, 4)
>>> img = np.zeros(shape, dtype=np.uint8)
>>> rr, cc = disk((0, 0), 2, shape=shape)
>>> img[rr, cc] = 1
>>> img
array([[1, 1, 0, 0],
       [1, 1, 0, 0],
       [0, 0, 0, 0],
       [0, 0, 0, 0]], dtype=uint8)
>>> img = np.zeros(shape, dtype=np.uint8)
>>> # Negative coordinates in rr and cc perform a wraparound
>>> rr, cc = disk((0, 0), 2, shape=None)
>>> img[rr, cc] = 1
>>> img
array([[1, 1, 0, 1],
       [1, 1, 0, 1],
       [0, 0, 0, 0],
       [1, 1, 0, 1]], dtype=uint8)
>>> img = np.zeros((10, 10), dtype=np.uint8)
>>> rr, cc = disk((4, 4), 5)
>>> img[rr, cc] = 1
>>> img
array([[0, 0, 1, 1, 1, 1, 1, 0, 0, 0],
       [0, 1, 1, 1, 1, 1, 1, 1, 0, 0],
       [1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
       [1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
       [1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
       [1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
       [1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
       [0, 1, 1, 1, 1, 1, 1, 1, 0, 0],
       [0, 0, 1, 1, 1, 1, 1, 0, 0, 0],
       [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]], dtype=uint8)