Matplotlib饼图Mathtext标签/ Autopct

时间:2015-08-28 15:00:50

标签: python text matplotlib pie-chart tex

所以我一直在使用pyplot pie()函数,它运行良好,除了当我尝试在wedge标签中使用mathtext时(如在autopct标签中,我想要数字, a \ pm(+ - )标志和一些相关的数字)。是否可以简单地做到这一点?我是否必须拔出所有楔形对象并操纵它们的文本(可能本身就是一系列Text对象)还是有一些更简单的方法?我不介意一些复杂性,我真的很想能够做到这一点。

编辑:一个例子是matplotlib代码库中的第一个饼图示例:

import matplotlib.pyplot as plt


# The slices will be ordered and plotted counter-clockwise.
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
sizes = [15, 30, 45, 10]
colors = ['yellowgreen', 'gold', 'lightskyblue', 'lightcoral']
explode = (0, 0.1, 0, 0) # only "explode" the 2nd slice (i.e. 'Hogs')

plt.pie(sizes, explode=explode, labels=labels, colors=colors,
        autopct='%1.1f%%', shadow=True, startangle=90)
# Set aspect ratio to be equal so that pie is drawn as a circle.
plt.axis('equal')

plt.show()

我们的想法是让autopct format关键字生成的数字以+ - 和某个数字结尾。

1 个答案:

答案 0 :(得分:4)

我不确定您的问题是使用mathtext还是创建自定义标签。此外,您没有说明在±符号后您想要放置的值的位置。

这里我假设您有一个列表,其中包含您要为每个楔形添加的值。

# The slices will be ordered and plotted counter-clockwise.
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
sizes = [15, 30, 45, 10]
colors = ['yellowgreen', 'gold', 'lightskyblue', 'lightcoral']
explode = (0, 0.1, 0, 0) # only "explode" the 2nd slice (i.e. 'Hogs')

patches, texts, autotexts = plt.pie(sizes, explode=explode, labels=labels, colors=colors,
        autopct='%1.1f%%', shadow=True, startangle=90)
# Set aspect ratio to be equal so that pie is drawn as a circle.
plt.axis('equal')


otherInfo = [3, 5, 3, 4]

for text, info in zip(autotexts, otherInfo):
    text.set_text(u"%s ± %.1f" % (text.get_text(), info)) #you can play here with the format to get the label that you want

enter image description here