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"""

======================

Primary 3D view planes

======================

This example generates an "unfolded" 3D plot that shows each of the primary 3D

view planes. The elevation, azimuth, and roll angles required for each view are

labeled. You could print out this image and fold it into a box where each plane

forms a side of the box.

"""

import matplotlib.pyplot as plt

def annotate_axes(ax, text, fontsize=18):

ax.text(x=0.5, y=0.5, z=0.5, s=text,

va="center", ha="center", fontsize=fontsize, color="black")

# (plane, (elev, azim, roll))

views = [('XY', (90, -90, 0)),

('XZ', (0, -90, 0)),

('YZ', (0, 0, 0)),

('-XY', (-90, 90, 0)),

('-XZ', (0, 90, 0)),

('-YZ', (0, 180, 0))]

layout = [['XY', '.', 'L', '.'],

['XZ', 'YZ', '-XZ', '-YZ'],

['.', '.', '-XY', '.']]

fig, axd = plt.subplot_mosaic(layout, subplot_kw={'projection': '3d'},

figsize=(12, 8.5))

for plane, angles in views:

axd[plane].set_xlabel('x')

axd[plane].set_ylabel('y')

axd[plane].set_zlabel('z')

axd[plane].set_proj_type('ortho')

axd[plane].view_init(elev=angles[0], azim=angles[1], roll=angles[2])

axd[plane].set_box_aspect(None, zoom=1.25)

label = f'{plane}\n{angles}'

annotate_axes(axd[plane], label, fontsize=14)

for plane in ('XY', '-XY'):

axd[plane].set_zticklabels([])

axd[plane].set_zlabel('')

for plane in ('XZ', '-XZ'):

axd[plane].set_yticklabels([])

axd[plane].set_ylabel('')

for plane in ('YZ', '-YZ'):

axd[plane].set_xticklabels([])

axd[plane].set_xlabel('')

label = 'mplot3d primary view planes\n' + 'ax.view_init(elev, azim, roll)'

annotate_axes(axd['L'], label, fontsize=18)

axd['L'].set_axis_off()

plt.show()

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