在matplotlib中组合补丁以获得单一透明度

import matplotlib.patches as patches

import matplotlib.pyplot as plt
import matplotlib.patches as patches

# 创建一个Figure对象和一个Axes对象
fig, ax = plt.subplots()

# 创建一个矩形补丁
rect = patches.Rectangle((0.2, 0.2), 0.6, 0.6, facecolor='blue', alpha=0.5)

# 创建一个圆形补丁
circle = patches.Circle((0.5, 0.5), 0.3, facecolor='red', alpha=0.5)

# 创建一个组合补丁，将矩形和圆形补丁组合在一起
composite_patch = patches.Patch(facecolor='none')
composite_patch.set_path([rect.get_path(), circle.get_path()])

# 将组合补丁添加到Axes对象中
ax.add_patch(composite_patch)

# 设置坐标轴范围
ax.set_xlim(0, 1)
ax.set_ylim(0, 1)

# 显示图形
plt.show()