艺术家中的艺术家

重写基本方法，以便一个艺术家对象可以包含另一个艺术家对象。在这种情况下，该行包含一个文本实例来为其添加标签。

  1. import numpy as np
  2. import matplotlib.pyplot as plt
  3. import matplotlib.lines as lines
  4. import matplotlib.transforms as mtransforms
  5. import matplotlib.text as mtext
  8. class MyLine(lines.Line2D):
  9.     def __init__(self, *args, **kwargs):
  10.         # we'll update the position when the line data is set
  11.         self.text = mtext.Text(0, 0, '')
  12.         lines.Line2D.__init__(self, *args, **kwargs)
  14.         # we can't access the label attr until *after* the line is
  15.         # initiated
  16.         self.text.set_text(self.get_label())
  18.     def set_figure(self, figure):
  19.         self.text.set_figure(figure)
  20.         lines.Line2D.set_figure(self, figure)
  22.     def set_axes(self, axes):
  23.         self.text.set_axes(axes)
  24.         lines.Line2D.set_axes(self, axes)
  26.     def set_transform(self, transform):
  27.         # 2 pixel offset
  28.         texttrans = transform + mtransforms.Affine2D().translate(2, 2)
  29.         self.text.set_transform(texttrans)
  30.         lines.Line2D.set_transform(self, transform)
  32.     def set_data(self, x, y):
  33.         if len(x):
  34.             self.text.set_position((x[-1], y[-1]))
  36.         lines.Line2D.set_data(self, x, y)
  38.     def draw(self, renderer):
  39.         # draw my label at the end of the line with 2 pixel offset
  40.         lines.Line2D.draw(self, renderer)
  41.         self.text.draw(renderer)
  43. # Fixing random state for reproducibility
  44. np.random.seed(19680801)
  47. fig, ax = plt.subplots()
  48. x, y = np.random.rand(2, 20)
  49. line = MyLine(x, y, mfc='red', ms=12, label='line label')
  50. #line.text.set_text('line label')
  51. line.text.set_color('red')
  52. line.text.set_fontsize(16)
  54. ax.add_line(line)
  56. plt.show()

艺术家中的艺术家

参考

此示例显示了以下函数、方法、类和模块的使用：

  1. import matplotlib
  2. matplotlib.lines
  3. matplotlib.lines.Line2D
  4. matplotlib.lines.Line2D.set_data
  5. matplotlib.artist
  6. matplotlib.artist.Artist
  7. matplotlib.artist.Artist.draw
  8. matplotlib.artist.Artist.set_transform
  9. matplotlib.text
  10. matplotlib.text.Text
  11. matplotlib.text.Text.set_color
  12. matplotlib.text.Text.set_fontsize
  13. matplotlib.text.Text.set_position
  14. matplotlib.axes.Axes.add_line
  15. matplotlib.transforms
  16. matplotlib.transforms.Affine2D

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