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86 lines
2.3 KiB
Markdown
86 lines
2.3 KiB
Markdown
# 自定义Boxstyle02
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```python
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from matplotlib.path import Path
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from matplotlib.patches import BoxStyle
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import matplotlib.pyplot as plt
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# we may derive from matplotlib.patches.BoxStyle._Base class.
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# You need to override transmute method in this case.
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class MyStyle(BoxStyle._Base):
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"""
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A simple box.
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"""
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def __init__(self, pad=0.3):
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"""
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The arguments need to be floating numbers and need to have
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default values.
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*pad*
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amount of padding
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"""
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self.pad = pad
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super().__init__()
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def transmute(self, x0, y0, width, height, mutation_size):
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"""
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Given the location and size of the box, return the path of
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the box around it.
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- *x0*, *y0*, *width*, *height* : location and size of the box
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- *mutation_size* : a reference scale for the mutation.
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Often, the *mutation_size* is the font size of the text.
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You don't need to worry about the rotation as it is
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automatically taken care of.
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"""
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# padding
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pad = mutation_size * self.pad
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# width and height with padding added.
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width, height = width + 2.*pad, \
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height + 2.*pad,
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# boundary of the padded box
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x0, y0 = x0-pad, y0-pad,
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x1, y1 = x0+width, y0 + height
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cp = [(x0, y0),
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(x1, y0), (x1, y1), (x0, y1),
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(x0-pad, (y0+y1)/2.), (x0, y0),
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(x0, y0)]
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com = [Path.MOVETO,
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Path.LINETO, Path.LINETO, Path.LINETO,
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Path.LINETO, Path.LINETO,
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Path.CLOSEPOLY]
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path = Path(cp, com)
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return path
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# register the custom style
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BoxStyle._style_list["angled"] = MyStyle
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fig, ax = plt.subplots(figsize=(3, 3))
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ax.text(0.5, 0.5, "Test", size=30, va="center", ha="center", rotation=30,
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bbox=dict(boxstyle="angled,pad=0.5", alpha=0.2))
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del BoxStyle._style_list["angled"]
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plt.show()
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```
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## 下载这个示例
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- [下载python源码: custom_boxstyle02.py](https://matplotlib.org/_downloads/custom_boxstyle02.py)
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- [下载Jupyter notebook: custom_boxstyle02.ipynb](https://matplotlib.org/_downloads/custom_boxstyle02.ipynb)
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