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40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
# 改变与盒子相交的线条的颜色
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与矩形相交的线条用红色着色，而其他线条用蓝色线条留下。此示例展示了intersect_bbox函数。
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```python
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import numpy as np
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import matplotlib.pyplot as plt
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from matplotlib.transforms import Bbox
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from matplotlib.path import Path
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# Fixing random state for reproducibility
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np.random.seed(19680801)
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left, bottom, width, height = (-1, -1, 2, 2)
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rect = plt.Rectangle((left, bottom), width, height, facecolor="#aaaaaa")
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fig, ax = plt.subplots()
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ax.add_patch(rect)
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bbox = Bbox.from_bounds(left, bottom, width, height)
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for i in range(12):
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vertices = (np.random.random((2, 2)) - 0.5) * 6.0
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path = Path(vertices)
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if path.intersects_bbox(bbox):
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color = 'r'
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else:
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color = 'b'
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ax.plot(vertices[:, 0], vertices[:, 1], color=color)
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plt.show()
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```
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## 下载这个示例
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- [下载python源码: bbox_intersect.py](https://matplotlib.org/_downloads/bbox_intersect.py)
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- [下载Jupyter notebook: bbox_intersect.ipynb](https://matplotlib.org/_downloads/bbox_intersect.ipynb) |