在matplotlib中制作高度为0的透明颜色条

import matplotlib.pyplot as plt
import numpy as np

cmap = plt.cm.get_cmap('viridis')  # 选择一个颜色映射
norm = plt.Normalize(vmin=0, vmax=1)  # 设置归一化范围
colorbar = plt.cm.ScalarMappable(norm=norm, cmap=cmap)  # 创建颜色条对象
colorbar.set_array([])  # 设置颜色条的值为空

fig, ax = plt.subplots()
cax = ax.imshow(np.zeros((10, 10)), cmap=cmap, vmin=0, vmax=1)  # 创建一个空的图像
fig.colorbar(colorbar, ax=ax, orientation='horizontal', pad=0.05)  # 添加颜色条到图像中

cax.set_visible(False)  # 隐藏颜色条

import matplotlib.pyplot as plt
import numpy as np

cmap = plt.cm.get_cmap('viridis')
norm = plt.Normalize(vmin=0, vmax=1)
colorbar = plt.cm.ScalarMappable(norm=norm, cmap=cmap)
colorbar.set_array([])

fig, ax = plt.subplots()
cax = ax.imshow(np.zeros((10, 10)), cmap=cmap, vmin=0, vmax=1)
fig.colorbar(colorbar, ax=ax, orientation='horizontal', pad=0.05)
cax.set_visible(False)

plt.show()