資料格式：（polygon.txt) 裡面含有2個多邊形，一行是一個點

0.085,0.834,
0.024,0.744,
0,0.63,0.516,
0.085,0.427,
0.5,0.02,
0.675,0.191,
0.795,0.071,
0.815,0.052,
0.835,0.032,
0.84,0.026,
0.844,0.022,
0.856,0.012,
0.871,0.005,
0.886,0.001,
0.903,

0.823,0.061,
0.823,0.062,
0.826,

import pylab as py
import time
from pylab import *
from matplotlib.font_manager import FontProperties
import matplotlib.pyplot as plt
font = FontProperties(fname=r"c:\windows\fonts\simsun.ttc",size=14)
def readdata(ls):
  l = ls.split(',')
  if len(l)>2:
    return [l[0],l[1]]
  else:
    return None

if "__main__"==__name__:
  print(9)
  file_obj=open('fanmaker.txt')
  k=0
  line=file_obj.readline()
  polygon =[]
  while line:
      k+=1
      px=[]
      py=[] 
      while line:
        row = readdata(line)
        print (line)
        px.append(row[0])
        py.append(row[1])
        line=file_obj.readline()
        if line=='\n':
          ps=[]
          px.append(px[0])
          py.append(py[0])
          ps.append(px)
          ps.append(py)
          polygon.append(ps)
          line=file_obj.readline()
          break
  x=np.array(polygon[0][0])
  y=np.array(polygon[0][1])
##  plt.fill(x,y,'b')
  plt.plot(x,'b-',linewidth=2)
  for i in range(len(polygon)-1):
    x=np.array(polygon[i+1][0])
    y=np.array(polygon[i+1][1])
##    plt.fill(x,'b')
    plt.plot(x,'r-',linewidth=2)
    plt.hold(True)
##  plt.show()

  x1=[-0.5,1.5]
  x2=[-0.5,-0.5]
  x3=[1.5,-0.5]
  x4=[1.5,1.5]
  plt.plot(x1,x2,'-')
  plt.plot(x2,x3,'-')
  plt.plot(x3,x4,'-')
  plt.plot(x4,x1,'-')
  plt.axis([-0.5,1.5,-0.5,1.5])
  plt.show()
  #   plt.axis('tight')
  file_obj.close()

以上這篇python繪製封閉多邊形教程就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支援我們。