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from matplotlib.path import Path
def custom_box_style(x0, y0, width, height, mutation_size, mutation_aspect=1):
"""
Given the location and size of the box, return the path of
the box around it.
- *x0*, *y0*, *width*, *height* : location and size of the box
- *mutation_size* : a reference scale for the mutation.
- *aspect_ratio* : aspect-ration for the mutation.
"""
# note that we are ignoring mutation_aspect. This is okay in general.
# padding
mypad = 0.3
pad = mutation_size * mypad
# width and height with padding added.
width = width + 2 * pad
height = height + 2 * pad
# boundary of the padded box
x0, y0 = x0 - pad, y0 - pad
x1, y1 = x0 + width, y0 + height
cp = [(x0, y0),
(x1, y0), (x1, y1), (x0, y1),
(x0-pad, (y0+y1)/2.), (x0, y0),
(x0, y0)]
com = [Path.MOVETO,
Path.LINETO, Path.LINETO, Path.LINETO,
Path.LINETO, Path.LINETO,
Path.CLOSEPOLY]
path = Path(cp, com)
return path
import matplotlib.pyplot as plt
fig, ax = plt.subplots(figsize=(3, 3))
ax.text(0.5, 0.5, "Test", size=30, va="center", ha="center",
bbox=dict(boxstyle=custom_box_style, alpha=0.2))
plt.show()
 
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