简单锚定艺术家对象示例

此示例说明如何使用在 offsetbox 和 Matplotlib axes_grid1 Toolkit 中找到的锚定辅助对象类。类似图形的实现，但不使用工具包，可以在锚定的艺术家对象中找到。

简单锚定艺术家对象示例

  1. import matplotlib.pyplot as plt
  4. def draw_text(ax):
  5.     """
  6.     Draw two text-boxes, anchored by different corners to the upper-left
  7.     corner of the figure.
  8.     """
  9.     from matplotlib.offsetbox import AnchoredText
  10.     at = AnchoredText("Figure 1a",
  11.                       loc='upper left', prop=dict(size=8), frameon=True,
  12.                       )
  13.     at.patch.set_boxstyle("round,pad=0.,rounding_size=0.2")
  14.     ax.add_artist(at)
  16.     at2 = AnchoredText("Figure 1(b)",
  17.                        loc='lower left', prop=dict(size=8), frameon=True,
  18.                        bbox_to_anchor=(0., 1.),
  19.                        bbox_transform=ax.transAxes
  20.                        )
  21.     at2.patch.set_boxstyle("round,pad=0.,rounding_size=0.2")
  22.     ax.add_artist(at2)
  25. def draw_circle(ax):
  26.     """
  27.     Draw a circle in axis coordinates
  28.     """
  29.     from mpl_toolkits.axes_grid1.anchored_artists import AnchoredDrawingArea
  30.     from matplotlib.patches import Circle
  31.     ada = AnchoredDrawingArea(20, 20, 0, 0,
  32.                               loc='upper right', pad=0., frameon=False)
  33.     p = Circle((10, 10), 10)
  34.     ada.da.add_artist(p)
  35.     ax.add_artist(ada)
  38. def draw_ellipse(ax):
  39.     """
  40.     Draw an ellipse of width=0.1, height=0.15 in data coordinates
  41.     """
  42.     from mpl_toolkits.axes_grid1.anchored_artists import AnchoredEllipse
  43.     ae = AnchoredEllipse(ax.transData, width=0.1, height=0.15, angle=0.,
  44.                          loc='lower left', pad=0.5, borderpad=0.4,
  45.                          frameon=True)
  47.     ax.add_artist(ae)
  50. def draw_sizebar(ax):
  51.     """
  52.     Draw a horizontal bar with length of 0.1 in data coordinates,
  53.     with a fixed label underneath.
  54.     """
  55.     from mpl_toolkits.axes_grid1.anchored_artists import AnchoredSizeBar
  56.     asb = AnchoredSizeBar(ax.transData,
  57.                           0.1,
  58.                           r"1$^{\prime}$",
  59.                           loc='lower center',
  60.                           pad=0.1, borderpad=0.5, sep=5,
  61.                           frameon=False)
  62.     ax.add_artist(asb)
  65. ax = plt.gca()
  66. ax.set_aspect(1.)
  68. draw_text(ax)
  69. draw_circle(ax)
  70. draw_ellipse(ax)
  71. draw_sizebar(ax)
  73. plt.show()

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