def joincmap(cmap1, cmap2, N=256):
"""
Join two colormaps and return one dynamic colormap.
"""
if isinstance(cmap1, str):
cmap1 = plt.get_cmap(cmap1)
if isinstance(cmap2, str):
cmap2 = plt.get_cmap(cmap2)
cmap = ListedColormap(
np.vstack((cmap1(np.linspace(0, 1,
N // 2)), cmap2(np.linspace(0, 1,
N // 2)))),
'->'.join((cmap1.name, cmap2.name)), N)
cmap._init()
cmap.values = np.linspace(-1, 1, N)
cmap.hinge = 0
return DynamicColormap(cmap)
