Python腳本讀取DXF文件多邊形頂點座標

關於DXF文件格式說明在上一篇已經有較爲詳細的說明，由於這個程序是爲了特定項目所服務的，所以對文件有一定的限制條件：在DXF文件中只存在一個多邊形實體，獲取這個多邊形所有的頂點座標即可。

class Point:
    'this class is used to record coordinate of vertex'
    def __init__(self,x,y):
        self.x = x
        self.y = y

 point是記錄點座標的數據結構

下面是相應的讀取處理代碼：

from Point import Point

class DxfReader:
    def __init__(self,file):
        self.file = file
        #pointList record the vertexes of polyline
        self.pointList = []

    def readDXF(self):

        line1 =""
        line1 = self.file.readline()
        line2=""
        counter = 0
        # record the sum of vertex
        sumofVertext = 1
        x = 0
        y =0

        for line in file:
        #find the polyline
            if line1.strip() == "0" and line.strip()== "LWPOLYLINE":
                for linetemp in file:
                   if line2.strip() =="90":
                       numofVertex = int(linetemp.strip())
                   # while 10 occur,then the x is recorded
                   if line2.strip() == "10":
                       x = float(linetemp.strip())

                   if line2.strip() == "20":
                       y = float(linetemp.strip())
                       point = Point (x,y)
                       self.pointList.append(point)
                       counter += 1
                       if counter >= numofVertex:
                           break

                   line2 = linetemp



            line1 = line

        file.close()

if __name__=="__main__":
    file = open("D:\\test.dxf")
    reader = DxfReader(file)
    reader.readDXF()
    for temp in reader.pointList:
        print str(temp.x) + "  " + str(temp.y)