transparatent“叠加” matplotlib stackplot

Question

我有一个简单stackplot：

import matplotlib.pyplot as plt

label, color = ["R", "M"], ["green", "blue"]
X = [x for x in range(101)]
Y1 =  [31.4*x for x in range(101)]
Y2 = [26.51*x-250 if (26.51*x-250)>=0 else 0 for x in range(101)]
Y3 =  [31.4*x if 31.4*x < 2400 else 2400 for x in range(101)]

plt.stackplot(X, Y1, Y2, labels=label, colors = color)
plt.fill_between(X,Y3,[2400 for x in range(101)], color = 'r')
plt.legend(loc=2)
plt.xlim(0,100)
plt.ylim(0,5600)
plt.show()

有可能是显示我想显示什么更好的办法，但我只是想知道怎么回事，如果可能的话，使红色区域透明与matplotlib。

Answer 1

如果我理解正确的话，你需要像下面这样？

在这种情况下，您可以指定fill_between的透明度

import matplotlib.pyplot as plt

label, color = ["R", "M"], ["green", "blue"]
X = [x for x in range(101)]
Y1 =  [31.4*x for x in range(101)]
Y2 = [26.51*x-250 if (26.51*x-250)>=0 else 0 for x in range(101)]
Y3 =  [31.4*x if 31.4*x < 2400 else 2400 for x in range(101)]

plt.stackplot(X, Y1, Y2, labels=label, colors = color)
plt.fill_between(X,Y3,[2400 for x in range(101)], color = 'r', alpha=0.3)
plt.legend(loc=2)
plt.xlim(0,100)
plt.ylim(0,5600)