[英]How to fill a polygon with a custom hatch in matplotlib?
I'm using python and matplotlib to create several closed polygons.我正在使用 python 和 matplotlib 创建几个封闭的多边形。 I then need to fill them with a hatch, which can be done through set_hatch.
然后我需要用舱口填充它们,这可以通过 set_hatch 完成。
http://matplotlib.org/api/artist_api.html#matplotlib.patches.Patch.set_hatch http://matplotlib.org/api/artist_api.html#matplotlib.patches.Patch.set_hatch
http://matplotlib.org/examples/pylab_examples/hatch_demo.html http://matplotlib.org/examples/pylab_examples/hatch_demo.html
Unfortunately I am working with greyscale images, and I need more hatches than provided by default - I would prefer to provide a bitmap (or some similar image) which could be tiled instead of using these hatches with varying densities.不幸的是,我正在处理灰度图像,我需要比默认提供的更多的阴影 - 我更愿意提供可以平铺的位图(或一些类似的图像),而不是使用这些具有不同密度的阴影。
I am open to other python libraries (pyglet, pygame, PIL, etc) however I would prefer the solution to be in python.我对其他 python 库(pyglet、pygame、PIL 等)持开放态度,但我更喜欢使用 python 的解决方案。
You can subclass matplotlib.hatch.Shapes
and define a custom hatch based on any reference path drawn inside unit square [[-0.5, 0.5] x [-0.5, 0.5]].您可以子类化
matplotlib.hatch.Shapes
并根据在单位正方形 [[-0.5, 0.5] x [-0.5, 0.5]] 内绘制的任何参考路径定义自定义阴影。
Tentative:暂定的:
import numpy as np
import matplotlib.hatch
import matplotlib.pyplot as plt
from matplotlib.patches import Ellipse, Polygon
house_path = Polygon(
[[-0.3, -0.4], [0.3, -0.4], [0.3, 0.1], [0., 0.4], [-0.3, 0.1]],
closed=True, fill=False).get_path()
class CustomHatch(matplotlib.hatch.Shapes):
"""
Custom hatches defined by a path drawn inside [-0.5, 0.5] square.
Identifier 'c'.
"""
filled = True
size = 1.0
path = house_path
def __init__(self, hatch, density):
self.num_rows = (hatch.count('c')) * density
self.shape_vertices = self.path.vertices
self.shape_codes = self.path.codes
matplotlib.hatch.Shapes.__init__(self, hatch, density)
matplotlib.hatch._hatch_types.append(CustomHatch)
fig = plt.figure()
ax = fig.add_subplot(111)
ellipse = ax.add_patch(Ellipse((0.5, 0.5), 0.3, 0.5, fill=False))
ellipse.set_hatch('c')
ellipse.set_color('red')
plt.show()
Giving:给予:
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