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Dec 3, 2022
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Shorten demo_axes_grid example. #24582

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167 changes: 61 additions & 106 deletions examples/axes_grid1/demo_axes_grid.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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()