matplotlib图例标签在键下

Question

如何调整标签位置与键的关系？我重新分类了数据，并显示了一个离散的corbar，它看起来像多个句柄的图例。实际上，我找不到任何关于标签位置（文本或数字）的参数。默认设置是左键，右键。我能换个位置吗？例如键下或键上的标签。我的目的是显示图例如下（键下的标签和键之间没有空格：

import matplotlib.patches as mpatches
import matplotlib.pyplot as plt
import numpy as np

data  = np.random.randint(8, size=(100,100))
cmap = plt.cm.get_cmap('PiYG', 8) 
plt.pcolormesh(data,cmap = cmap,alpha = 0.75)
# Set borders in the interval [0, 1]
bound = np.linspace(0, 1, 9)
# Preparing borders for the legend
bound_prep = np.round(bound * 7, 2)
# Creating 8 Patch instances
plt.legend([mpatches.Patch(color=cmap(b)) for b in bound[:-1]],
       ['{}'.format(bound_prep[i]) for i in range(8)],
       bbox_to_anchor=(0,-0.25,1,0.2),ncol=len(bound))

似乎没有参数来调整标签的位置。你知道吗

Answer 1

import matplotlib.pyplot as plt
import numpy as np

data  = np.random.randint(8, size=(100,100))
cmap = plt.cm.get_cmap('PiYG', 8)
fig, ax = plt.subplots()
pcm = ax.pcolormesh(data,cmap = cmap,alpha = 0.75, vmin=0, vmax=8)
fig.colorbar(pcm, ax=ax)
plt.show()