pyplot饼图绘制（北理大嵩天MOOC课程笔记）

例1：

import matplotlib.pyplot as plt 
labels1='Frogs','Hogs','Dogs','Logs'
size1=[10,25,30,18]
explode1=(0,0.1,0,0)
plt.pie(size1,explode=explode1,labels=labels1,autopct='%1.1f%%',shadow=False,startangle=90)
plt.show()

结果：

例2：shadow为True

import matplotlib.pyplot as plt 
labels1='Frogs','Hogs','Dogs','Logs'
size1=[10,25,30,18]
explode1=(0,0.1,0,0)
plt.pie(size1,explode=explode1,labels=labels1,autopct='%1.1f%%',shadow=True,startangle=90)
plt.show()

结果：

例三：调整startangle

import matplotlib.pyplot as plt 
labels1='Frogs','Hogs','Dogs','Logs'
size1=[10,25,30,18]
explode1=(0,0.1,0,0)
plt.pie(size1,explode=explode1,labels=labels1,autopct='%1.1f%%',shadow=True,startangle=0)
plt.show()

结果：

例四：plt.axis('equal')

import matplotlib.pyplot as plt 
labels1='Frogs','Hogs','Dogs','Logs'
size1=[10,25,30,18]
explode1=(0,0.1,0,0)
plt.pie(size1,explode=explode1,labels=labels1,autopct='%1.1f%%',shadow=False,startangle=90)
plt.axis('equal')
plt.show()

例五：设置explode的不同结果

import matplotlib.pyplot as plt 
labels1='Frogs','Hogs','Dogs','Logs'
size1=[10,25,30,18]
explode1=(0,1,0,0)
plt.pie(size1,explode=explode1,labels=labels1,autopct='%1.1f%%',shadow=False,startangle=90)
plt.show()

• 直接把官网说明拿下来：

matplotlib.pyplot.pie

• matplotlib.pyplot.pie(x, explode=None, labels=None, colors=None, autopct=None, pctdistance=0.6, shadow=False, labeldistance=1.1, startangle=None, radius=None, counterclock=True, wedgeprops=None, textprops=None, center=(0, 0), frame=False, rotatelabels=False, *, data=None)

• Plot a pie chart.

  • Make a pie chart of array x. The fractional area of each wedge is given by x/sum(x). If sum(x) < 1, then the values of x give the fractional area directly and the array will not be normalized. The resulting pie will have an empty wedge of size 1 - sum(x).
    制作x阵列饼图。每个楔形的分数面积由x/sum(X)表示。如果和(X)<1，则x的值直接给出分数区域，并且数组不会被规范化。得到的饼将有一个大小为1和(X)的空楔形。

  • The wedges are plotted counterclockwise, by default starting from the x-axis.
    楔形是逆时针绘制的，默认情况下从x轴开始。

Parameters:

• x : array-like

  • The wedge sizes.

• explode : array-like, optional, default: None

  • If not None, is a len(x) array which specifies(具体说明) the fraction of the radius with which to offset each wedge.（如果没有，则为len(X)数组，该数组指定(具体说明)用于偏移每个楔形的半径的部分。）

• labels : list, optional, default: None

  • A sequence of strings providing the labels for each wedge（一系列字符串，为每个楔形提供标签）

• colors : array-like, optional, default: None

  • A sequence of matplotlib color args through which the pie chart will cycle. If None, will use the colors in the currently active cycle.（一种颜色均匀的序列，饼形图将通过该序列循环。如果没有，将在当前活动周期中使用颜色。）

• autopct : None (default), string, or function, optional

  • If not None, is a string or function used to label the wedges with their numeric value. The label will be placed inside the wedge. If it is a format string, the label will be fmt%pct. If it is a function, it will be called.（如果不是无，则是一个字符串或函数，用于用数字值标记该值。标签将放置在楔子内。如果是格式字符串，则标签为fmt％pct。如果它是一个函数，它将被调用。）

• pctdistance : float, optional, default: 0.6

  • The ratio between the center of each pie slice and the start of the text generated by autopct. Ignored if autopct is None.（每个饼图切片的中心与autopct生成的文本的开头之间的比率。如果autopct为None，则忽略。）

• shadow : bool, optional, default: False

  • Draw a shadow beneath the pie.

• labeldistance : float, optional, default: 1.1

  • The radial distance at which the pie labels are drawn.(绘制饼图标签的径向距离。)

• startangle : float, optional, default: None

  • If not None, rotates the start of the pie chart by angle degrees counterclockwise from the x-axis.（如果不是None，则将饼图的起点从x轴逆时针旋转角度。）

• radius : float, optional, default: None

The radius of the pie, if radius is None it will be set to 1.（饼图的半径，如果半径为None，则将其设置为1。）

• counterclock : bool, optional, default: True

Specify fractions direction, clockwise or counterclockwise.（指定分数方向，顺时针或逆时针。）

• wedgeprops : dict, optional, default: None

  • Dict of arguments passed to the wedge objects making the pie. For example, you can pass in wedgeprops = {'linewidth': 3} to set the width of the wedge border lines equal to 3. For more details, look at the doc/arguments of the wedge object. By default clip_on=False.（传递给制作饼状图的对象的参数的Dict。例如，可以传入wedgeprops={'linewidth': 3}来设置楔形边框线的宽度为3。有关更多详细信息，请查看wedge对象的doc / arguments。默认情况下clip_on = False。）

• textprops : dict, optional, default: None

  • Dict of arguments to pass to the text objects.（以字典形式传递给文本对象作为参数。）

• center : list of float, optional, default: (0, 0)

  • Center position of the chart. Takes value (0, 0) or is a sequence of 2 scalars.（图表的中心位置。取值（0,0）或是2个标量的序列。）

• frame : bool, optional, default: False

  • Plot axes frame with the chart if true.（如果为真，则绘制轴与图表的框架。）

• rotatelabels : bool, optional, default: False

  • Rotate each label to the angle of the corresponding slice if true.（如果为true，则将每个标签旋转到相应切片的角度。）

Returns:

• patches : list

  • A sequence of matplotlib.patches.Wedge instances.(一系列matplotlib.patches.Wedge实例。)

• texts : list

  • A list of the label matplotlib.text.Text instances.(标签matplotlib.text.Text实例的列表。)

• autotexts : list

  • A list of Text instances for the numeric labels. This will only be returned if the parameter autopct is not None.(数字标签的文本实例列表。仅当参数autopct不是None时才会返回。)