prtools.ellipse#

ellipse(shape, xradius, yradius, shift=(0, 0), angle=0, antialias=True, indexing='ij')[source]#

Draw an ellipse

Parameters:

shape (array_like) – Size of output in pixels (nrows, ncols)
xradius (float) – Semi-axis of the ellipse in pixels in the x (horizontal) direction.
yradius (float) – Semi-axis of the ellipse in pixels in the y (vertical) direction.
shift ((2,) array_like, optional) – How far to shift center. Default is (0, 0).
angle (float, optional) – Mesh rotation in degrees. When indexing = 'xy' the rotation is measured from the +x axis toward the +y axis. When indexing = 'ij' the rotation is measured from the +i axis toward the +j axis. Note that rotations occur about the shifted center if shift is nonzero. Default is 0.
antialias (bool, optional) – If True (default), the shape edges are antialiased.
indexing ({'ij', 'xy'}, optional) – Matrix (‘ij’, default) or cartesian (‘xy’) indexing of shift.

Return type:

ndarray

Examples

>>> ell = prtools.ellipse(shape=(256, 256), xradius=100, yradius=50)
>>> plt.imshow(ell, cmap='gray')

>>> ell = prtools.ellipse(shape=(256, 256), xradius=100, yradius=50, angle=30)
>>> plt.imshow(ell, cmap='gray')