python - Matplotlib-Venn 中准确的颜色混合

Question

使用以下代码:

from matplotlib import pyplot as plt
from matplotlib_venn import venn2
from collections import OrderedDict

named_sets = {'x1': set(['foo','foo','bar',"pax"]), "x3" : set(['foo','qux','bar',"zoo"])}
od = OrderedDict(sorted(named_sets.iteritems()))

circlenm = ()
circlels = []
for k,v in od.iteritems():
    circlenm = circlenm + (k,)
    circlels.append(v)


c = venn2(subsets = circlels,set_labels = circlenm)
c.get_patch_by_id('10').set_color('red')
c.get_patch_by_id('01').set_color('blue')
c.get_patch_by_id('10').set_edgecolor('none')
c.get_patch_by_id('01').set_edgecolor('none')
c.get_patch_by_id('10').set_alpha(0.4)
c.get_patch_by_id('01').set_alpha(0.4)
plt.show()

我可以得到下图:

在这里，我想将“蓝色”圆圈与“红色”圆圈混合。请注意，混合的结果是棕色。

但实际值应该是light magenta(下图是使用默认matplotlib_venn.venn3创建的):

我怎样才能正确地做到这一点？

Answer 1

添加这 3 行以设置交叉点的颜色和显示属性:

c.get_patch_by_id('11').set_color('magenta')
c.get_patch_by_id('11').set_edgecolor('none')
c.get_patch_by_id('11').set_alpha(0.4)

如果你想要一个准确的颜色那么你可以这样设置:

c.get_patch_by_id('11').set_color('#e098e1')

补丁 ID 是一个位掩码，显示该区域位于哪个圆圈内。