import matplotlib
import matplotlib.pyplot as plt

#定义文本框和箭头格式
decisionNode =dict(boxstyle="sawtooth",fc="0.8")
leafNode=dict(boxstyle="round4",fc="0.8")
arrow_args=dict(arrowstyle="<-")

#绘制带箭头的注解
def plotNode(nodeTxt,centerPt,parentPt,nodeType):
  createPlot.axl.annotate(nodeTxt,xy=parentPt,xycoords='axes fraction',xytext=centerPt,textcoords='axes fraction',va="center",ha="center",bbox=nodeType,arrowprops=arrow_args)

def createPlot():
  fig =plt.figure(1,facecolor='white')
  fig.clf()
  createPlot.axl=plt.subplot(111,frameon=False)
  plotNode(U'决策点',(0.5,0.1),(0.1,0.5),decisionNode)
  plotNode(U'叶节点',(0.8,0.1),(0.3,0.8),leafNode)
  plt.show()

import matplotlib.pyplot as plt
import matplotlib

#定义自定义字体，文件名是系统中文字体
myfont = matplotlib.font_manager.FontProperties(fname='C:/Windows/Fonts/simkai.ttf') 
#解决负号'-'显示为方块的问题 
matplotlib.rcParams['axes.unicode_minus']=False 

decisionNode =dict(boxstyle="sawtooth",fc="0.8")
leafNode=dict(boxstyle="round4",fc="0.8")
arrow_args=dict(arrowstyle="<-")

def plotNode(nodeTxt,centerPt,parentPt,nodeType):
  createPlot.axl.annotate(nodeTxt,xy=parentPt,xycoords='axes fraction',xytext=centerPt,textcoords='axes fraction',va="center",ha="center",bbox=nodeType,arrowprops=arrow_args,fontproperties=myfont)

def createPlot():
  fig =plt.figure(1,facecolor='white')
  fig.clf()
  createPlot.axl=plt.subplot(111,frameon=False)
  plotNode(U'决策点',(0.5,0.1),(0.1,0.5),decisionNode)
  plotNode(U'叶节点',(0.8,0.1),(0.3,0.8),leafNode)
  plt.show()