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"""
=====================================
Project contour profiles onto a graph
=====================================
Demonstrates displaying a 3D surface while also projecting contour 'profiles'
onto the 'walls' of the graph.
See :doc:`contourf3d_2` for the filled version.
"""
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import axes3d
ax = plt.figure().add_subplot(projection='3d')
X, Y, Z = axes3d.get_test_data(0.05)
# Plot the 3D surface
ax.plot_surface(X, Y, Z, edgecolor='royalblue', lw=0.5, rstride=8, cstride=8,
alpha=0.3)
# Plot projections of the contours for each dimension. By choosing offsets
# that match the appropriate axes limits, the projected contours will sit on
# the 'walls' of the graph.
ax.contour(X, Y, Z, zdir='z', offset=-100, cmap='coolwarm')
ax.contour(X, Y, Z, zdir='x', offset=-40, cmap='coolwarm')
ax.contour(X, Y, Z, zdir='y', offset=40, cmap='coolwarm')
ax.set(xlim=(-40, 40), ylim=(-40, 40), zlim=(-100, 100),
xlabel='X', ylabel='Y', zlabel='Z')
plt.show()
# %%
# .. tags::
# plot-type: 3D,
# component: axes,
# level: intermediate
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