如何用Python实现绘制封闭多边形的详细教程？

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数据格式：(polygon.txt) 包含两个多边形，每行一个点 + 0.085, +0.834, +0.024, +0.744, +0, +0.63, +0.024, +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, +0.8

数据格式：（polygon.txt) 里面含有2个多边形，一行是一个点

0.085, 0.834,
0.024, 0.744,
0, 0.63,
0.024, 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,

0.823, 0.061,
0.823, 0.062,
0.826, 0.061,

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,y,'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,y,'b') plt.plot(x,y,'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()

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