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Grid of images with shared xaxis and yaxis.
import numpy as npfrom matplotlib import cbookimport matplotlib.colorsimport matplotlib.pyplot as pltfrom mpl_toolkits.axes_grid1 import ImageGriddef add_inner_title(ax, title, loc, **kwargs): from matplotlib.offsetbox import AnchoredText from matplotlib.patheffects import withStroke prop = dict(path_effects=[withStroke(foreground='w', linewidth=3)], size=plt.rcParams['legend.fontsize']) at = AnchoredText(title, loc=loc, prop=prop, pad=0., borderpad=0.5, frameon=False, **kwargs) ax.add_artist(at) return atfig = plt.figure(figsize=(6, 6))# Prepare imagesZ = cbook.get_sample_data("axes_grid/bivariate_normal.npy", np_load=True)extent = (-3, 4, -4, 3)ZS = [Z[i::3, :] for i in range(3)]extent = extent[0], extent[1]/3., extent[2], extent[3]# *** Demo 1: colorbar at each axes ***grid = ImageGrid(fig, 211, # similar to subplot(211) nrows_ncols=(1, 3), axes_pad=0.05, label_mode="1", share_all=True, cbar_location="top", cbar_mode="each", cbar_size="7%", cbar_pad="1%", )for i, (ax, z) in enumerate(zip(grid, ZS)): im = ax.imshow(z, origin="lower", extent=extent) cb = ax.cax.colorbar(im) # Changing the colorbar ticks if i in [1, 2]: cb.set_ticks([-1, 0, 1])for ax, im_title in zip(grid, ["Image 1", "Image 2", "Image 3"]): t = add_inner_title(ax, im_title, loc='lower left') t.patch.set_alpha(0.5)for ax, z in zip(grid, ZS): ax.cax.toggle_label(True)grid[0].set_xticks([-2, 0])grid[0].set_yticks([-2, 0, 2])# *** Demo 2: shared colorbar ***grid2 = ImageGrid(fig, 212, nrows_ncols=(1, 3), axes_pad=0.05, label_mode="1", share_all=True, cbar_location="right", cbar_mode="single", cbar_size="10%", cbar_pad=0.05, )grid2[0].set_xlabel("X")grid2[0].set_ylabel("Y")vmax, vmin = np.max(ZS), np.min(ZS)norm = matplotlib.colors.Normalize(vmax=vmax, vmin=vmin)for ax, z in zip(grid2, ZS): im = ax.imshow(z, norm=norm, origin="lower", extent=extent)# With cbar_mode="single", cax attribute of all axes are identical.ax.cax.colorbar(im)ax.cax.toggle_label(True)for ax, im_title in zip(grid2, ["(a)", "(b)", "(c)"]): t = add_inner_title(ax, im_title, loc='upper left') t.patch.set_ec("none") t.patch.set_alpha(0.5)grid2[0].set_xticks([-2, 0])grid2[0].set_yticks([-2, 0, 2])plt.show()
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