你知道用于将dxf文件转换为bmp的好库（写在python上）吗？ 我有一个带有“filename_number”dxf文件的文件夹。 我想读它并将其转换为bmp。我还想保留文件的尺寸大小。
答案 0 :(得分：2)
我从here得到答案：
import StringIO, base64, logging, operator
import dxfgrabber
import Image, ImageDraw, ImageFont #PIL
from homcoord import *
def rint(x):return int(round(x))
class BBox:
"""bounding box"""
def __init__(self,pt1=None,pt2=None):
self._corner1=None
self._corner2=None
if pt1: self+=pt1
if pt2: self+=pt2
def __iadd__(self,pt):
if isinstance(pt,BBox):
self+=pt._corner1
self+=pt._corner2
else:
if not self._corner1:
self._corner1=pt
else:
self._corner1=Pt(map(min,zip(self._corner1.xy,pt.xy)))
if not self._corner2:
self._corner2=pt
else:
self._corner2=Pt(map(max,zip(self._corner2.xy,pt.xy)))
return self
def __repr__(self):
return "BBox(%s,%s)"%(self._corner1,self._corner2)
def __call__(self):
""":return: list of flatten corners"""
l=list(self._corner1.xy)
l.extend(list(self._corner2.xy))
return l
def size(self):
""":return: Pt with xy sizes"""
return self._corner2-self._corner1
def center(self):
""":return: Pt center"""
res=self._corner2+self._corner1
return res/2
def trans(self,trans):
"""
:param trans: Xform
:return: BBox = self transformed by trans
"""
return BBox(trans(self._corner1),trans(self._corner2))
def cbox(c,r):
""" bounding box of a circle
:param c: Pt center
:param r: float radius
:return: BBox
"""
rr=Pt(r,r)
return BBox(c+rr,c-rr)
def Trans(scale=1, offset=[0,0], rotation=0):
res=Xform([[scale,0,offset[0]],[0,scale,offset[1]],[0,0,1]])
if rotation:
res=Xrotate(rotation*pi/180.)*res
return res
class DXF:
def __init__(self, file, layers=None, ignore=[]):
"""reads a .dxf file
:param file: string path to .dxf file to read
:param layers: list or dictionary of layers to handle. Empty = all layers
:param ignore: list of strings of entity types to ignore
"""
self.dxf=dxfgrabber.readfile(file)
self.layers=layers
self.ignore=ignore
def entities(self,ent=None):
"""iterator over dxf or block entities"""
if not ent:
ent=self.dxf.entities
for e in ent:
if self.layers and e.layer not in self.layers:
continue
elif e.dxftype in self.ignore:
continue
else:
yield e
def bbox(self):
""":return: :class:BBox dwg enclosing bounding box"""
box=BBox()
for e in self.entities():
if e.dxftype=='LINE':
box+=Pt(e.start[:2])
box+=Pt(e.end[:2])
elif e.dxftype == 'CIRCLE':
box+=cbox(Pt(e.center[:2]),e.radius)
elif e.dxftype == 'ARC':
c=Pt(e.center[:2])
a=e.endangle-e.startangle
if a>0:
start=e.startangle
else: #arc goes clockwise (step will be negative)
start=e.endangle
n=rint(abs(a)/10.) # number of points each 10° approximately
n=max(n,1)
step=a/n #angle between 2 points, might be negative
for i in range(n+1):
box+=c.radial(e.radius,radians(start+i*step))
elif e.dxftype=='POLYLINE':
for v in e.vertices:
box+=Pt(v.location[:2])
elif e.dxftype=='BLOCK':
pass #TODO ...
elif e.dxftype in ['TEXT','INSERT']:
box+=Pt(e.insert[:2])
else:
logging.warning('Unknown entity %s'%e)
return box
def _draw(self,draw,entities,trans,pen="black"):
for e in entities:
if e.dxftype=='LINE':
b=list(trans(Pt(e.start[:2])).xy)
b.extend(list(trans(Pt(e.end[:2])).xy))
draw.line(b,fill=pen)
elif e.dxftype=='CIRCLE':
b=cbox(Pt(e.center[:2]),e.radius)
b=b.trans(trans)
draw.ellipse(b(),outline=pen)
elif e.dxftype=='ARC':
c=Pt(e.center[:2])
b=cbox(c,e.radius)
b=b.trans(trans)
b=map(rint,b())
startangle=degrees(trans.angle(radians(e.startangle)))
endangle=degrees(trans.angle(radians(e.endangle)))
startangle,endangle=endangle,startangle #swap start/end because of Y symmetry
draw.arc(b,int(startangle),int(endangle),fill=pen)
elif e.dxftype=='POLYLINE':
b=[]
for v in e.vertices:
b.extend(list(trans(Pt(v.location[:2])).xy))
draw.line(b,fill=pen)
elif e.dxftype=='TEXT':
h=e.height*trans.mag()
pt=Pt(e.insert[:2])+Pt(0,e.height) #ACAD places texts by top left point...
font=None
try:
font = ImageFont.truetype("c:/windows/fonts/Courier New.ttf", rint(h))
except:
pass
if not font:
h=h*1.4 #magic factor ...
fh=[8,10,12,14,16,18,20,22,24,26,28,30,36,40,48,60]
i,h=min(enumerate(fh), key=lambda x: abs(x[1]-h)) #http://stackoverflow.com/questions/9706041/finding-index-of-an-item-closest-to-the-value-in-a-list-thats-not-entirely-sort
import os
path=os.path.realpath(__file__)
path=os.path.dirname(path)
font = ImageFont.load(path+'\\base_pil\\72\\Courier New_%s_72.pil'%h)
draw.text(trans(pt).xy,e.text,font=font,fill=pen)
elif e.dxftype=='INSERT':
t2=Trans(1,e.insert,e.rotation).compose(trans)
self._draw(draw,self.entities(self.dxf.blocks[e.name]._entities),t2,pen)
elif e.dxftype=='BLOCK':
pass # block definition is automatically stored in dxf.blocks dictionary
else:
logging.warning('Unknown entity %s'%e)
def img(self,size=[256,256],back="white",pen="black",border=5,antialias=1):
""":result: :class:`PIL:Image` rasterized image"""
box=self.bbox()
from Goulib.math2 import product
if not product(box.size().xy): # either x or y ==0
return None
s=map(operator.div,[float(x-border)*antialias if x else 1E9 for x in size ],box.size().xy)
trans=Trans(scale=min(s))
size=trans(box.size())+Pt(2*antialias*border,2*antialias*border) #add borders as an offset
offset=size/2-trans(box.center()) #offset in pixel coordinates
trans=trans*Trans(offset=offset.xy)
trans=trans*Xscale(1,-1) #invert y axis
trans=trans*Xlate(0,size.y) #origin is lower left corner
img = Image.new("RGB", map(rint,size.xy), back)
self._draw(ImageDraw.Draw(img), self.entities(), trans, pen)
if antialias>1:
size=size/antialias
img=img.resize(map(rint,size.xy), Image.ANTIALIAS)
return img
def img2base64(img,fmt='PNG'):
"""
:param img: :class:`PIL:Image`
:result: string base64 encoded image content in specified format
:see: http://stackoverflow.com/questions/14348442/django-how-do-i-display-a-pil-image-object-in-a-template
"""
output = StringIO.StringIO()
img.save(output, fmt)
output.seek(0)
output_s = output.read()
return base64.b64encode(output_s)
if __name__ == '__main__':
dxf=DXF("..\\tests\\FERRO_01.DXF")
img=dxf.img(size=[1280,None],border=50)
print img2base64(img)
img.save('..\\tests\\out.png')
答案 1 :(得分：0)