matplotlib & pandas

Python/matplotlab/gallery/mplot3d/polys3d.md

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+# 生成多边形以填充3D线图
+
+演示如何创建填充线图下空间的多边形。 在这个例子中，多边形是半透明的，产生一种“锯齿状的彩色玻璃”效果。
+
+![生成多边形以填充3D线图示例](https://matplotlib.org/_images/sphx_glr_polys3d_001.png)
+
+```python
+# This import registers the 3D projection, but is otherwise unused.
+from mpl_toolkits.mplot3d import Axes3D  # noqa: F401 unused import
+
+from matplotlib.collections import PolyCollection
+import matplotlib.pyplot as plt
+from matplotlib import colors as mcolors
+import numpy as np
+
+# Fixing random state for reproducibility
+np.random.seed(19680801)
+
+
+def cc(arg):
+    '''
+    Shorthand to convert 'named' colors to rgba format at 60% opacity.
+    '''
+    return mcolors.to_rgba(arg, alpha=0.6)
+
+
+def polygon_under_graph(xlist, ylist):
+    '''
+    Construct the vertex list which defines the polygon filling the space under
+    the (xlist, ylist) line graph.  Assumes the xs are in ascending order.
+    '''
+    return [(xlist[0], 0.), *zip(xlist, ylist), (xlist[-1], 0.)]
+
+
+fig = plt.figure()
+ax = fig.gca(projection='3d')
+
+# Make verts a list, verts[i] will be a list of (x,y) pairs defining polygon i
+verts = []
+
+# Set up the x sequence
+xs = np.linspace(0., 10., 26)
+
+# The ith polygon will appear on the plane y = zs[i]
+zs = range(4)
+
+for i in zs:
+    ys = np.random.rand(len(xs))
+    verts.append(polygon_under_graph(xs, ys))
+
+poly = PolyCollection(verts, facecolors=[cc('r'), cc('g'), cc('b'), cc('y')])
+ax.add_collection3d(poly, zs=zs, zdir='y')
+
+ax.set_xlabel('X')
+ax.set_ylabel('Y')
+ax.set_zlabel('Z')
+ax.set_xlim(0, 10)
+ax.set_ylim(-1, 4)
+ax.set_zlim(0, 1)
+
+plt.show()
+```
+
+## 下载这个示例
+            
+- [下载python源码: polys3d.py](https://matplotlib.org/_downloads/polys3d.py)
+- [下载Jupyter notebook: polys3d.ipynb](https://matplotlib.org/_downloads/polys3d.ipynb)