绘制甜甜圈

Draw donuts (miam!) using Paths and PathPatches. This example shows the effect of the path’s orientations in a compound path.

  1. import numpy as np
  2. import matplotlib.path as mpath
  3. import matplotlib.patches as mpatches
  4. import matplotlib.pyplot as plt
  7. def wise(v):
  8.     if v == 1:
  9.         return "CCW"
  10.     else:
  11.         return "CW"
  14. def make_circle(r):
  15.     t = np.arange(0, np.pi * 2.0, 0.01)
  16.     t = t.reshape((len(t), 1))
  17.     x = r * np.cos(t)
  18.     y = r * np.sin(t)
  19.     return np.hstack((x, y))
  21. Path = mpath.Path
  23. fig, ax = plt.subplots()
  25. inside_vertices = make_circle(0.5)
  26. outside_vertices = make_circle(1.0)
  27. codes = np.ones(
  28.     len(inside_vertices), dtype=mpath.Path.code_type) * mpath.Path.LINETO
  29. codes[0] = mpath.Path.MOVETO
  31. for i, (inside, outside) in enumerate(((1, 1), (1, -1), (-1, 1), (-1, -1))):
  32.     # Concatenate the inside and outside subpaths together, changing their
  33.     # order as needed
  34.     vertices = np.concatenate((outside_vertices[::outside],
  35.                                inside_vertices[::inside]))
  36.     # Shift the path
  37.     vertices[:, 0] += i * 2.5
  38.     # The codes will be all "LINETO" commands, except for "MOVETO"s at the
  39.     # beginning of each subpath
  40.     all_codes = np.concatenate((codes, codes))
  41.     # Create the Path object
  42.     path = mpath.Path(vertices, all_codes)
  43.     # Add plot it
  44.     patch = mpatches.PathPatch(path, facecolor='#885500', edgecolor='black')
  45.     ax.add_patch(patch)
  47.     ax.annotate("Outside %s,\nInside %s" % (wise(outside), wise(inside)),
  48.                 (i * 2.5, -1.5), va="top", ha="center")
  50. ax.set_xlim(-2, 10)
  51. ax.set_ylim(-3, 2)
  52. ax.set_title('Mmm, donuts!')
  53. ax.set_aspect(1.0)
  54. plt.show()

绘制甜甜圈示例

参考

此示例中显示了以下函数，方法，类和模块的使用：

  1. import matplotlib
  2. matplotlib.path
  3. matplotlib.path.Path
  4. matplotlib.patches
  5. matplotlib.patches.PathPatch
  6. matplotlib.patches.Circle
  7. matplotlib.axes.Axes.add_patch
  8. matplotlib.axes.Axes.annotate
  9. matplotlib.axes.Axes.set_aspect
  10. matplotlib.axes.Axes.set_xlim
  11. matplotlib.axes.Axes.set_ylim
  12. matplotlib.axes.Axes.set_title

下载这个示例