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36 lines
1.1 KiB
Markdown
36 lines
1.1 KiB
Markdown
# 3D箭袋图像
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演示在3d网格上的点处绘制方向箭头。
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```python
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# This import registers the 3D projection, but is otherwise unused.
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from mpl_toolkits.mplot3d import Axes3D # noqa: F401 unused import
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import matplotlib.pyplot as plt
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import numpy as np
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fig = plt.figure()
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ax = fig.gca(projection='3d')
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# Make the grid
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x, y, z = np.meshgrid(np.arange(-0.8, 1, 0.2),
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np.arange(-0.8, 1, 0.2),
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np.arange(-0.8, 1, 0.8))
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# Make the direction data for the arrows
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u = np.sin(np.pi * x) * np.cos(np.pi * y) * np.cos(np.pi * z)
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v = -np.cos(np.pi * x) * np.sin(np.pi * y) * np.cos(np.pi * z)
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w = (np.sqrt(2.0 / 3.0) * np.cos(np.pi * x) * np.cos(np.pi * y) *
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np.sin(np.pi * z))
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ax.quiver(x, y, z, u, v, w, length=0.1, normalize=True)
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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: quiver3d.py](https://matplotlib.org/_downloads/quiver3d.py)
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- [下载Jupyter notebook: quiver3d.ipynb](https://matplotlib.org/_downloads/quiver3d.ipynb) |