matplotlib & pandas

Python/matplotlab/gallery/mplot3d/voxels_torus.md

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+# 具有圆柱坐标的3D体素/体积图
+
+演示使用ax.voxels的x，y，z参数。
+
+![具有圆柱坐标的3D体素/体积图示例](https://matplotlib.org/_images/sphx_glr_voxels_torus_001.png)
+
+```python
+import matplotlib.pyplot as plt
+import matplotlib.colors
+import numpy as np
+
+# This import registers the 3D projection, but is otherwise unused.
+from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+
+
+def midpoints(x):
+    sl = ()
+    for i in range(x.ndim):
+        x = (x[sl + np.index_exp[:-1]] + x[sl + np.index_exp[1:]]) / 2.0
+        sl += np.index_exp[:]
+    return x
+
+# prepare some coordinates, and attach rgb values to each
+r, theta, z = np.mgrid[0:1:11j, 0:np.pi*2:25j, -0.5:0.5:11j]
+x = r*np.cos(theta)
+y = r*np.sin(theta)
+
+rc, thetac, zc = midpoints(r), midpoints(theta), midpoints(z)
+
+# define a wobbly torus about [0.7, *, 0]
+sphere = (rc - 0.7)**2 + (zc + 0.2*np.cos(thetac*2))**2 < 0.2**2
+
+# combine the color components
+hsv = np.zeros(sphere.shape + (3,))
+hsv[..., 0] = thetac / (np.pi*2)
+hsv[..., 1] = rc
+hsv[..., 2] = zc + 0.5
+colors = matplotlib.colors.hsv_to_rgb(hsv)
+
+# and plot everything
+fig = plt.figure()
+ax = fig.gca(projection='3d')
+ax.voxels(x, y, z, sphere,
+          facecolors=colors,
+          edgecolors=np.clip(2*colors - 0.5, 0, 1),  # brighter
+          linewidth=0.5)
+
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: voxels_torus.py](https://matplotlib.org/_downloads/voxels_torus.py)
+- [下载Jupyter notebook: voxels_torus.ipynb](https://matplotlib.org/_downloads/voxels_torus.ipynb)