Generate polygons to fill under 3D line graphΒΆ

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.

from matplotlib.collections import PolyCollection
import matplotlib.pyplot as plt
import numpy as np
from scipy.stats import poisson

# Fixing random state for reproducibility

def polygon_under_graph(x, y):
    Construct the vertex list which defines the polygon filling the space under
    the (x, y) line graph. This assumes x is in ascending order.
    return [(x[0], 0.), *zip(x, y), (x[-1], 0.)]

ax = plt.figure().add_subplot(projection='3d')

x = np.linspace(0., 10., 31)
lambdas = range(1, 9)

# verts[i] is a list of (x, y) pairs defining polygon i.
verts = [polygon_under_graph(x, poisson.pmf(l, x)) for l in lambdas]
facecolors = plt.colormaps['viridis_r'](np.linspace(0, 1, len(verts)))

poly = PolyCollection(verts, facecolors=facecolors, alpha=.7)
ax.add_collection3d(poly, zs=lambdas, zdir='y')

ax.set(xlim=(0, 10), ylim=(1, 9), zlim=(0, 0.35),
       xlabel='x', ylabel=r'$\lambda$', zlabel='probability')

Total running time of the script: ( 0 minutes 1.312 seconds)

Keywords: matplotlib code example, codex, python plot, pyplot Gallery generated by Sphinx-Gallery