matplotlib & pandas

Python/matplotlab/gallery/userdemo/annotate_text_arrow.md

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+# 注释文本箭头
+
+```python
+import numpy as np
+import matplotlib.pyplot as plt
+
+fig, ax = plt.subplots(figsize=(5, 5))
+ax.set_aspect(1)
+
+x1 = -1 + np.random.randn(100)
+y1 = -1 + np.random.randn(100)
+x2 = 1. + np.random.randn(100)
+y2 = 1. + np.random.randn(100)
+
+ax.scatter(x1, y1, color="r")
+ax.scatter(x2, y2, color="g")
+
+bbox_props = dict(boxstyle="round", fc="w", ec="0.5", alpha=0.9)
+ax.text(-2, -2, "Sample A", ha="center", va="center", size=20,
+        bbox=bbox_props)
+ax.text(2, 2, "Sample B", ha="center", va="center", size=20,
+        bbox=bbox_props)
+
+
+bbox_props = dict(boxstyle="rarrow", fc=(0.8, 0.9, 0.9), ec="b", lw=2)
+t = ax.text(0, 0, "Direction", ha="center", va="center", rotation=45,
+            size=15,
+            bbox=bbox_props)
+
+bb = t.get_bbox_patch()
+bb.set_boxstyle("rarrow", pad=0.6)
+
+ax.set_xlim(-4, 4)
+ax.set_ylim(-4, 4)
+
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: annotate_text_arrow.py](https://matplotlib.org/_downloads/annotate_text_arrow.py)
+- [下载Jupyter notebook: annotate_text_arrow.ipynb](https://matplotlib.org/_downloads/annotate_text_arrow.ipynb)