[matplotlib-devel] [PATCH] Discontinuous colormaps are reversed incorrectly

[Stan W. <sta...@nr...>]

import matplotlib as mpl
import matplotlib.pyplot as plt
import matplotlib.cm as mcmap
import numpy as np

def show_cmap_rgb(cmap, axes):
    x = np.linspace(0, 1, 256)
    rgba = cmap(x)
    lines = []
    for (idx, color) in enumerate('rgb'):
        lines.extend(axes.plot(x, rgba[:, idx], ':', color=color))
    axes.set_xlim(0, 1)
    axes.set_ylim(-0.1, 1.1)
    return lines

fig = plt.figure()

axes_f = fig.add_subplot(2, 1, 1)
show_cmap_rgb(mcmap.gist_stern, axes_f)
axes_f.set_title('Forward')

axes_r = fig.add_subplot(2, 1, 2)
show_cmap_rgb(mcmap.gist_stern_r, axes_r)
axes_r.invert_xaxis()
axes_r.set_title('Reversed')