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Python的ezdxf包操作dxf文件 获取属性 计算 长度，角度，面积，中心点

pip install ezdxf==1.0.2 -i https://pypi.mirrors.ustc.edu.cn/simple/

代码如下：

import math

#from shapely.geometry import Polygon

import ezdxf

def get_line_length_angle(e):

#return math.atan2(start[1]-end[1], start[0]-end[0])*180/math.pi

start=e.dxf.start

end=e.dxf.end

l=ezdxf.math.distance(start,end)

a= math.degrees(math.atan2(end[1]-start[1], end[0]-start[0]))

x=(start[0]+end[0])/2

y=(start[1]+end[1])/2

line_mid=x,y

return l,a if a>=0 else a+360,line_mid

# helper function

def print_entity_line(e):

print(e.dxf.dxftype)

print(e.dxf.all_existing_dxf_attribs())

print(“LINE on layer: %s\n” % e.dxf.layer)

print(“LINE on color: %s\n” % e.dxf.color)

print(“start point: %s\n” % e.dxf.start)

print(“end point: %s\n” % e.dxf.end)

print(“LINE on linetype: %s\n” % e.dxf.linetype)

print(“LINE on color: %s\n” % e.dxf.lineweight)

print(“LINE on lineweight: %s\n” % e.dxf.handle)

#print(“长度: %s\n” % math.dist(e.dxf.start, e.dxf.end))

l,a,line_mid=get_line_length_angle(e)

print(“长度: %s\n” % l)

print(“角度: %s\n” % a)

print(line_mid)

def print_entity_lwpolyline(e):

print(e.dxf.dxftype)

print(e.dxf.all_existing_dxf_attribs())

print(“LWPOLYLINE on layer: %s\n” % e.dxf.layer)

print(“LWPOLYLINE on color: %s\n” % e.dxf.color)

print(“LWPOLYLINE on linetype: %s\n” % e.dxf.linetype)

print(“LWPOLYLINE on lineweight: %s\n” % e.dxf.lineweight)

mlength=[]

#分解,炸开

for i in e.explode():

mlength.append(ezdxf.math.distance(i.dxf.start, i.dxf.end))

with e.points(‘xy’) as points:

print(points)

print(“长度: %s\n” % sum(mlength))

#print(“面积: %s\n” % Polygon(points).area)

print(“面积: %s\n” % ezdxf.math.area(points))

def get_arc_length_area(e):

end_a = e.dxf.end_angle

start_a=e.dxf.start_angle

r=e.dxf.radius

#弧长l = A * np.pi * R / 180

a=end_a+(360 if start_a>end_a else 0)-start_a

l=a*r*math.pi/180

#圆弧面积

area=l*r/2

#CAD圆弧面积=圆弧面积 加或减 三角面积

arc_delta=ezdxf.math.area([e.start_point,e.end_point,e.dxf.center])

cad_area=area – (arc_delta if end_a-start_a<180 else -1*arc_delta)

#圆弧中点坐标

x= e.dxf.center[0]+r*math.cos(math.radians(a/2+start_a));

y= e.dxf.center[1]+r*math.sin(math.radians(a/2+start_a));

arc_mid=x,y

return l,area,cad_area,arc_mid

def print_entity_arc(e):

print(e.dxf.dxftype)

print(e.dxf.all_existing_dxf_attribs())

print(“ARC on layer: %s\n” % e.dxf.layer)

print(“ARC on color: %s\n” % e.dxf.color)

print(“ARC on color: %s\n” % e.dxf.linetype)

print(“ARC on color: %s\n” % e.dxf.lineweight)

print(“center point: %s\n” % e.dxf.center)

print(“ARC on radius: %s\n” % e.dxf.radius)

print(“ARC on start_angle: %s\n” % e.dxf.start_angle)

print(“ARC on end_angle: %s\n” % e.dxf.end_angle)

l,area,cad_area,arc_mid=get_arc_length_area(e)

print(“弧长: %s\n” % l)

print(“圆弧面积: %s\n” % area)

print(“CAD计算圆弧面积: %s\n” % cad_area)

print(arc_mid)

def print_entity_circle(e):

print(e.dxf.dxftype)

print(e.dxf.all_existing_dxf_attribs())

print(“CIRCLE on layer: %s\n” % e.dxf.layer)

print(“CIRCLE on color: %s\n” % e.dxf.color)

print(“CIRCLE on linetype: %s\n” % e.dxf.linetype)

print(“CIRCLE on lineweight: %s\n” % e.dxf.lineweight)

print(“center point: %s\n” % e.dxf.center)

print(“CIRCLE on radius: %s\n” % e.dxf.radius)

print(“圆的周长: %s\n” % str(math.pi*e.dxf.radius*2))

print(“圆的面积: %s\n” % str(math.pi*e.dxf.radius**2))

#print(e.dxf.get(‘layer’))

def print_entity_polyline(e):

print(e.dxf.dxftype)

print(e.dxf.all_existing_dxf_attribs())

print(“POLYLINE on layer: %s\n” % e.dxf.layer)

print(“POLYLINE on color: %s\n” % e.dxf.color)

print(“POLYLINE on linetype: %s\n” % e.dxf.linetype)

print(“POLYLINE on lineweight: %s\n” % e.dxf.lineweight)

points=[]

for i in e.vertices:

print(i.dxf.all_existing_dxf_attribs())

points.append(i.dxf.location)

mlength=[]

arc_areas=[]

#分解,炸开

for i in e.explode():

#print_entity_line(i)

#points.append(i.dxf.start)

#points.append(i.dxf.end)

#print(i.dxftype)

if i.dxftype()==”ARC”:

l,area,cad_area,m_mid=get_arc_length_area(i)

mlength.append(l)

arc_areas.append(cad_area)

if i.dxftype()==”LINE”:

mlength.append(ezdxf.math.distance(i.dxf.start, i.dxf.end))

print(points)

print(mlength)

print(“长度: %s\n” % sum(mlength))

#print(“面积: %s\n” % Polygon(points).area)

print(“面积: %s\n” % str(ezdxf.math.area(points)+sum(arc_areas)))

”’

if e.is_poly_face_mesh:

mesh = MeshBuilder.from_polyface(e)

print(mesh.vertices)

print(mesh.faces)

”’

#读取 dxf 格式 r12

doc = ezdxf.readfile(“sample.dxf”)

# iterate over all entities in modelspace

msp = doc.modelspace()

”’

for e in msp:

if e.dxftype() == “LINE”:

print_entity(e)

”’

# entity query for all LINE entities in modelspace

for e in msp.query(“LINE”):

print_entity_line(e)

for e in msp.query(“LWPOLYLINE”):

print_entity_lwpolyline(e)

for e in msp.query(“ARC”):

print_entity_arc(e)

for e in msp.query(“CIRCLE”):

print_entity_circle(e)

for e in msp.query(“POLYLINE”):

print_entity_polyline(e)