注释文本箭头

  1. import numpy as np
  2. import matplotlib.pyplot as plt
  4. fig, ax = plt.subplots(figsize=(5, 5))
  5. ax.set_aspect(1)
  7. x1 = -1 + np.random.randn(100)
  8. y1 = -1 + np.random.randn(100)
  9. x2 = 1. + np.random.randn(100)
  10. y2 = 1. + np.random.randn(100)
  12. ax.scatter(x1, y1, color="r")
  13. ax.scatter(x2, y2, color="g")
  15. bbox_props = dict(boxstyle="round", fc="w", ec="0.5", alpha=0.9)
  16. ax.text(-2, -2, "Sample A", ha="center", va="center", size=20,
  17.         bbox=bbox_props)
  18. ax.text(2, 2, "Sample B", ha="center", va="center", size=20,
  19.         bbox=bbox_props)
  22. bbox_props = dict(boxstyle="rarrow", fc=(0.8, 0.9, 0.9), ec="b", lw=2)
  23. t = ax.text(0, 0, "Direction", ha="center", va="center", rotation=45,
  24.             size=15,
  25.             bbox=bbox_props)
  27. bb = t.get_bbox_patch()
  28. bb.set_boxstyle("rarrow", pad=0.6)
  30. ax.set_xlim(-4, 4)
  31. ax.set_ylim(-4, 4)
  33. plt.show()

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