.. only:: html
.. note::
:class: sphx-glr-download-link-note
Click :ref:`here ` to download the full example code
.. rst-class:: sphx-glr-example-title
.. _sphx_glr_gallery_mplot3d_polys3d.py:
=============================================
Generate polygons to fill under 3D line graph
=============================================
Demonstrate how to create polygons which fill the space under a line
graph. In this example polygons are semi-transparent, creating a sort
of 'jagged stained glass' effect.
.. image:: /gallery/mplot3d/images/sphx_glr_polys3d_001.png
:alt: polys3d
:class: sphx-glr-single-img
.. code-block:: default
from matplotlib.collections import PolyCollection
import matplotlib.pyplot as plt
import numpy as np
# Fixing random state for reproducibility
np.random.seed(19680801)
def polygon_under_graph(xlist, ylist):
"""
Construct the vertex list which defines the polygon filling the space under
the (xlist, ylist) line graph. Assumes the xs are in ascending order.
"""
return [(xlist[0], 0.), *zip(xlist, ylist), (xlist[-1], 0.)]
fig = plt.figure()
ax = fig.gca(projection='3d')
# Make verts a list such that verts[i] is a list of (x, y) pairs defining
# polygon i.
verts = []
# Set up the x sequence
xs = np.linspace(0., 10., 26)
# The ith polygon will appear on the plane y = zs[i]
zs = range(4)
for i in zs:
ys = np.random.rand(len(xs))
verts.append(polygon_under_graph(xs, ys))
poly = PolyCollection(verts, facecolors=['r', 'g', 'b', 'y'], alpha=.6)
ax.add_collection3d(poly, zs=zs, zdir='y')
ax.set_xlabel('X')
ax.set_ylabel('Y')
ax.set_zlabel('Z')
ax.set_xlim(0, 10)
ax.set_ylim(-1, 4)
ax.set_zlim(0, 1)
plt.show()
.. _sphx_glr_download_gallery_mplot3d_polys3d.py:
.. only :: html
.. container:: sphx-glr-footer
:class: sphx-glr-footer-example
.. container:: sphx-glr-download sphx-glr-download-python
:download:`Download Python source code: polys3d.py `
.. container:: sphx-glr-download sphx-glr-download-jupyter
:download:`Download Jupyter notebook: polys3d.ipynb `
.. only:: html
.. rst-class:: sphx-glr-signature
Keywords: matplotlib code example, codex, python plot, pyplot
`Gallery generated by Sphinx-Gallery
`_