如何在Matplotlib中将值转换为圆形的颜色信息？

Question

I am trying to convert values into color information in Colormap. I have z values and would like to map z value into circle shape. For example, I have a coordinate (xi,yi) and would like to draw a circle centering this coordinate with z value mapped into colormap. However, it is not drawing any circle. Below is my code.

r = 100
color_map = cm.Oranges
norm = Normalize(vmin=1, vmax=100)
rgba = color_map(norm(zi))

CS = plt.Circle((xi, yi), r, color=rgba[0])

Answer 1

You have couple of issues actually. You didn't create any axes and you are using color map incorrectly. So, create your circles and note how color_map is used. Then add it to a created axes object.

import matplotlib.pyplot as plt

r = 100
color_map = plt.get_cmap("Oranges")
circle1 = plt.Circle((0, 0), 0.2, color=color_map(0.66))
circle2 = plt.Circle((0.5, 0.5), 0.2, color=color_map(0.45))
circle3 = plt.Circle((1, 1), 0.2, color=color_map(0.2), clip_on=True)

fig, ax = plt.subplots()
ax.add_artist(circle1)
ax.add_artist(circle2)
ax.add_artist(circle3)