Merge pull request matplotlib#24582 from anntzer/dag

Shorten demo_axes_grid example.

Author: tacaswell

examples/axes_grid1/demo_axes_grid.py

@@ -3,123 +3,78 @@
 Demo Axes Grid
 ==============
 
-Grid of 2x2 images with single or own colorbar.
+Grid of 2x2 images with a single colorbar or with one colorbar per axes.
 """
 
 from matplotlib import cbook
 import matplotlib.pyplot as plt
 from mpl_toolkits.axes_grid1 import ImageGrid
 
 
-def get_demo_image():
-    z = cbook.get_sample_data("axes_grid/bivariate_normal.npy", np_load=True)
-    # z is a numpy array of 15x15
-    return z, (-3, 4, -4, 3)
-
-
-def demo_simple_grid(fig):
-    """
-    A grid of 2x2 images with 0.05 inch pad between images and only
-    the lower-left axes is labeled.
-    """
-    grid = ImageGrid(fig, 141,  # similar to subplot(141)
-                     nrows_ncols=(2, 2),
-                     axes_pad=0.05,
-                     label_mode="1",
-                     )
-    Z, extent = get_demo_image()
-    for ax in grid:
-        ax.imshow(Z, extent=extent)
-    # This only affects axes in first column and second row as share_all=False.
-    grid.axes_llc.set_xticks([-2, 0, 2])
-    grid.axes_llc.set_yticks([-2, 0, 2])
-
-
-def demo_grid_with_single_cbar(fig):
-    """
-    A grid of 2x2 images with a single colorbar
-    """
-    grid = ImageGrid(fig, 142,  # similar to subplot(142)
-                     nrows_ncols=(2, 2),
-                     axes_pad=0.0,
-                     share_all=True,
-                     label_mode="L",
-                     cbar_location="top",
-                     cbar_mode="single",
-                     )
-
-    Z, extent = get_demo_image()
-    for ax in grid:
-        im = ax.imshow(Z, extent=extent)
-    grid.cbar_axes[0].colorbar(im)
-
-    for cax in grid.cbar_axes:
-        cax.toggle_label(False)
-
-    # This affects all axes as share_all = True.
-    grid.axes_llc.set_xticks([-2, 0, 2])
-    grid.axes_llc.set_yticks([-2, 0, 2])
-
-
-def demo_grid_with_each_cbar(fig):
-    """
-    A grid of 2x2 images. Each image has its own colorbar.
-    """
-    grid = ImageGrid(fig, 143,  # similar to subplot(143)
-                     nrows_ncols=(2, 2),
-                     axes_pad=0.1,
-                     label_mode="1",
-                     share_all=True,
-                     cbar_location="top",
-                     cbar_mode="each",
-                     cbar_size="7%",
-                     cbar_pad="2%",
-                     )
-    Z, extent = get_demo_image()
-    for ax, cax in zip(grid, grid.cbar_axes):
-        im = ax.imshow(Z, extent=extent)
-        cax.colorbar(im)
-        cax.toggle_label(False)
-
-    # This affects all axes because we set share_all = True.
-    grid.axes_llc.set_xticks([-2, 0, 2])
-    grid.axes_llc.set_yticks([-2, 0, 2])
-
-
-def demo_grid_with_each_cbar_labelled(fig):
-    """
-    A grid of 2x2 images. Each image has its own colorbar.
-    """
-    grid = ImageGrid(fig, 144,  # similar to subplot(144)
-                     nrows_ncols=(2, 2),
-                     axes_pad=(0.45, 0.15),
-                     label_mode="1",
-                     share_all=True,
-                     cbar_location="right",
-                     cbar_mode="each",
-                     cbar_size="7%",
-                     cbar_pad="2%",
-                     )
-    Z, extent = get_demo_image()
-
-    # Use a different colorbar range every time
-    limits = ((0, 1), (-2, 2), (-1.7, 1.4), (-1.5, 1))
-    for ax, cax, vlim in zip(grid, grid.cbar_axes, limits):
-        im = ax.imshow(Z, extent=extent, vmin=vlim[0], vmax=vlim[1])
-        cb = cax.colorbar(im)
-        cb.set_ticks((vlim[0], vlim[1]))
-
-    # This affects all axes because we set share_all = True.
-    grid.axes_llc.set_xticks([-2, 0, 2])
-    grid.axes_llc.set_yticks([-2, 0, 2])
+Z = cbook.get_sample_data(  # (15, 15) array
+    "axes_grid/bivariate_normal.npy", np_load=True)
+extent = (-3, 4, -4, 3)
 
 
 fig = plt.figure(figsize=(10.5, 2.5))
 fig.subplots_adjust(left=0.05, right=0.95)
 
-demo_simple_grid(fig)
-demo_grid_with_single_cbar(fig)
-demo_grid_with_each_cbar(fig)
-demo_grid_with_each_cbar_labelled(fig)
+
+# A grid of 2x2 images with 0.05 inch pad between images and only the
+# lower-left axes is labeled.
+grid = ImageGrid(
+    fig, 141,  # similar to fig.add_subplot(141).
+     nrows_ncols=(2, 2), axes_pad=0.05, label_mode="1")
+for ax in grid:
+    ax.imshow(Z, extent=extent)
+# This only affects axes in first column and second row as share_all=False.
+grid.axes_llc.set_xticks([-2, 0, 2])
+grid.axes_llc.set_yticks([-2, 0, 2])
+
+
+# A grid of 2x2 images with a single colorbar
+grid = ImageGrid(
+    fig, 142,  # similar to fig.add_subplot(142).
+    nrows_ncols=(2, 2), axes_pad=0.0, label_mode="L", share_all=True,
+    cbar_location="top", cbar_mode="single")
+for ax in grid:
+    im = ax.imshow(Z, extent=extent)
+grid.cbar_axes[0].colorbar(im)
+for cax in grid.cbar_axes:
+    cax.toggle_label(False)
+# This affects all axes as share_all = True.
+grid.axes_llc.set_xticks([-2, 0, 2])
+grid.axes_llc.set_yticks([-2, 0, 2])
+
+
+# A grid of 2x2 images. Each image has its own colorbar.
+grid = ImageGrid(
+    fig, 143,  # similar to fig.add_subplot(143).
+    nrows_ncols=(2, 2), axes_pad=0.1, label_mode="1", share_all=True,
+    cbar_location="top", cbar_mode="each", cbar_size="7%", cbar_pad="2%")
+for ax, cax in zip(grid, grid.cbar_axes):
+    im = ax.imshow(Z, extent=extent)
+    cax.colorbar(im)
+    cax.toggle_label(False)
+# This affects all axes because we set share_all = True.
+grid.axes_llc.set_xticks([-2, 0, 2])
+grid.axes_llc.set_yticks([-2, 0, 2])
+
+
+# A grid of 2x2 images. Each image has its own colorbar.
+grid = ImageGrid(
+    fig, 144,  # similar to fig.add_subplot(144).
+    nrows_ncols=(2, 2), axes_pad=(0.45, 0.15), label_mode="1", share_all=True,
+    cbar_location="right", cbar_mode="each", cbar_size="7%", cbar_pad="2%")
+# Use a different colorbar range every time
+limits = ((0, 1), (-2, 2), (-1.7, 1.4), (-1.5, 1))
+for ax, cax, vlim in zip(grid, grid.cbar_axes, limits):
+    im = ax.imshow(Z, extent=extent, vmin=vlim[0], vmax=vlim[1])
+    cb = cax.colorbar(im)
+    cb.set_ticks((vlim[0], vlim[1]))
+# This affects all axes because we set share_all = True.
+grid.axes_llc.set_xticks([-2, 0, 2])
+grid.axes_llc.set_yticks([-2, 0, 2])
+
 
 plt.show()