Mathplotlib Draw Triangle With Gradient Fill

I have to draw a triangle in Python using mathplotlib. This is how it should eventually look like: My objective is, once drawn the triangle, to plot some points on it. At the mome

Solution 1:

There is an example on the matplotlib page showing how to use a clip path for an image. Adapting this to your case would give this:

import matplotlib.pyplot as plt 
import numpy as np
from matplotlib.path import Path
from matplotlib.patches import PathPatch


fig = plt.figure() 
ax = fig.add_subplot(111, aspect='equal') 
path = Path([[0,0],[0,1],[1,0],[0,0]])
patch = PathPatch(path, facecolor='none')
ax.add_patch(patch) 
Z, Z2 = np.meshgrid(np.linspace(0,1), np.linspace(0,1))
im = plt.imshow(Z-Z2, interpolation='bilinear', cmap=plt.cm.RdYlGn,
                origin='lower', extent=[0, 1, 0, 1],
                clip_path=patch, clip_on=True)
im.set_clip_path(patch)
ax.set_xlim((0,1)) 
ax.set_ylim((0,1)) 
plt.show()