至于dxf文件的格式在之前的博文中已经有详细的叙述，在此将不做赘述。

from Point import Point

class DXFReaderImpl:

def __init__(self,file):

self.file = file

self.points = [] ## 用于记录点实体的坐标值

self.points_line = [] ## 用于记录线段的各端点坐标值，包括直线和折线两种线型

self.points_polygon = [] ## 用于纪录多边形的顶点坐标值

def readDXF(self):

firstLine =""

secondLine = ""

secondLine = self.file.readline().strip()

while secondLine != "EOF":

if firstLine.strip() == "0" and secondLine.strip()== "LWPOLYLINE":

self.readPolyline()

if firstLine.strip() == "0" and secondLine.strip() == "LINE":

self.readLines()

if firstLine.strip() == "0" and secondLine.strip() == "POINT":

pass

firstLine = secondLine

secondLine = self.file.readline().strip()

print "there are " + str(i) + "polyline"

##

## def readPolygon(self):

## pass

## read polyline. In dxf file,polygon is a closed polyline

def readPolyline(self):

counter = 0

numofvertex = 1

flagofPolygon = 0

x = 0

y = 0

firstLine = "LWPOLYLINE"

secondLine = self.file.readline().strip()

pointList = []

while counter<=numofvertex:

if firstLine == "90":

numofvertex = int(secondLine)

if firstLine == "70":

flagofPolygon = int(secondLine)

if firstLine == "10":

x = float(secondLine)

if firstLine == "20":

y = float(secondLine)

pointList.append(Point(x,y))

counter = counter + 1

firstLine = secondLine

secondLine = self.file.readline().strip()

if flagofPolygon == 0:

self.points_line.append(pointList)

else:

self.points_polygon.append(pointList)

def readPoint(self):

firstLine = "POINT"

secondLine = self.file.readline().strip()

x = 0.0

y = 0.0

while firstLine != "30":

if firstLine == "10":

x = float(secondLine)

if firstLine == "20":

y = float(secondLine)

firstLine = secondLine

secondList = self.file.readline().strip();

self.points.append(Point(x,y))

## read straight line

def readLines(self):

x1 = 0.0

y1 = 0.0

x2 = 0.0

y2 = 0.0

firstLine = "POINT"

## secondLine = ""

seondLine = self.file.readline().strip()

while firstLine != "31":

if firstLine == "10":

x1 = float(secondLine)

if firstLine == "20":

y1 = float(secondLine)

if firstLine == "11":

x2 = float(secondLine)

if firstLine == "21":

y2 = float(secondLine)

firstLine = secondLine

secondLine = self.file.readline().strip()

tempLine = []

tempLine.append(Point(x1,y1))

tempLine.append(Point(x2,y2))

self.points_line.append(tempLine)

if __name__=="__main__":

file = open("D:\\test.dxf","r")

reader = DXFReaderImpl(file)

reader.readDXF()

i = 1

for temp in reader.points_polygon:

print " this is the " + str(i) + " polygon"

for points in temp:

print str(points.x) + " " + str(points.y)

i = i + 1

## i = 1

## for temp in reader.points_line:

## print " this is the " + str(i) + " polyline"

## for points in temp:

## print str(points.x) + " " + str(points.y)

## i += 1

print "over"

此段代码主要用于读取点，直线，折线，多边形等四种实体的坐标值。

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2009-10-07 14:42

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