import matplotlib.pyplot as plt
from matplotlib.collections import PatchCollection
from matplotlib.patches import Polygon

fig, axs = plt.subplots()
p1, p2 = Polygon([[0,0],[100,100],[200,0]], label="p1"), Polygon([[400,0],[500,100],[600,0]], label="p2")
p = PatchCollection([p1,p2], label="asd")
axs.add_collection(p, autolim=True)
axs.set_xlim(right=600)
axs.set_ylim(top=100)
axs.legend()