annotate diagonal python
import matplotlib.pyplot as plt
import numpy as np
def addtext(ax, props):
ax.text(0.5, 0.5, 'text 0', props, rotation=0)
ax.text(1.5, 0.5, 'text 45', props, rotation=45)
ax.text(2.5, 0.5, 'text 135', props, rotation=135)
ax.text(3.5, 0.5, 'text 225', props, rotation=225)
ax.text(4.5, 0.5, 'text -45', props, rotation=-45)
for x in range(0, 5):
ax.scatter(x + 0.5, 0.5, color='r', alpha=0.5)
ax.set_yticks([0, .5, 1])
ax.set_xlim(0, 5)
ax.grid(True)
# the text bounding box
bbox = {'fc': '0.8', 'pad': 0}
fig, axs = plt.subplots(2, 1)
addtext(axs[0], {'ha': 'center', 'va': 'center', 'bbox': bbox})
axs[0].set_xticks(np.arange(0, 5.1, 0.5), [])
axs[0].set_ylabel('center / center')
addtext(axs[1], {'ha': 'left', 'va': 'bottom', 'bbox': bbox})
axs[1].set_xticks(np.arange(0, 5.1, 0.5))
axs[1].set_ylabel('left / bottom')
plt.show()