sdxf.py

使用python写的一个关于AutoCAD dxf文件读写的程序

        if self.justifyhor:result+='\n72\n%s'%self.justifyhor
        if self.alignment:result+='\n%s'%_point(self.alignment,1)
        if self.justifyver:result+='\n73\n%s'%self.justifyver
        return result

class Mtext(Text):
    """Surrogate for mtext, generates some Text instances."""
    def __init__(self,text='',point=(0,0,0),width=250,spacingFactor=1.5,down=0,spacingWidth=None,**options):
        Text.__init__(self,text=text,point=point,**options)
        if down:spacingFactor*=-1
        self.spacingFactor=spacingFactor
        self.spacingWidth=spacingWidth
        self.width=width
        self.down=down
    def __str__(self):
        texts=self.text.replace('\r\n','\n').split('\n')
        if not self.down:texts.reverse()
        result=''
        x=y=0
        if self.spacingWidth:spacingWidth=self.spacingWidth
        else:spacingWidth=self.height*self.spacingFactor
        for text in texts:
            while text:
                result+='\n%s'%Text(text[:self.width],
                    point=(self.point[0]+x*spacingWidth,
                           self.point[1]+y*spacingWidth,
                           self.point[2]),
                    alignment=self.alignment,flag=self.flag,height=self.height,
                    justifyhor=self.justifyhor,justifyver=self.justifyver,
                    rotation=self.rotation,obliqueAngle=self.obliqueAngle,
                    style=self.style,xscale=self.xscale,parent=self
                )
                text=text[self.width:]
                if self.rotation:x+=1
                else:y+=1
        return result[1:]
        
##class _Mtext(_Entity):
##    """Mtext not functioning for minimal dxf."""
##    def __init__(self,text='',point=(0,0,0),attachment=1,
##                 charWidth=None,charHeight=1,direction=1,height=100,rotation=0,
##                 spacingStyle=None,spacingFactor=None,style=None,width=100,
##                 xdirection=None,**common):
##        _Entity.__init__(self,**common)
##        self.text=text
##        self.point=point
##        self.attachment=attachment
##        self.charWidth=charWidth
##        self.charHeight=charHeight
##        self.direction=direction
##        self.height=height
##        self.rotation=rotation
##        self.spacingStyle=spacingStyle
##        self.spacingFactor=spacingFactor
##        self.style=style
##        self.width=width
##        self.xdirection=xdirection
##    def __str__(self):
##        input=self.text
##        text=''
##        while len(input)>250:
##            text+='\n3\n%s'%input[:250]
##            input=input[250:]
##        text+='\n1\n%s'%input
##        result= '0\nMTEXT\n%s\n%s\n40\n%s\n41\n%s\n71\n%s\n72\n%s%s\n43\n%s\n50\n%s'%\
##                (self._common(),_point(self.point),self.charHeight,self.width,
##                 self.attachment,self.direction,text,
##                 self.height,
##                 self.rotation)
##        if self.style:result+='\n7\n%s'%self.style
##        if self.xdirection:result+='\n%s'%_point(self.xdirection,1)
##        if self.charWidth:result+='\n42\n%s'%self.charWidth
##        if self.spacingStyle:result+='\n73\n%s'%self.spacingStyle
##        if self.spacingFactor:result+='\n44\n%s'%self.spacingFactor
##        return result
    
#---tables
class Block(_Collection):
    """Use list methods to add entities, eg append."""
    def __init__(self,name,layer='0',flag=0,base=(0,0,0),entities=[]):
        self.entities=copy.copy(entities)
        _Collection.__init__(self,entities)
        self.layer=layer
        self.name=name
        self.flag=0
        self.base=base
    def __str__(self):
        e='\n'.join([str(x)for x in self.entities])
        return '0\nBLOCK\n8\n%s\n2\n%s\n70\n%s\n%s\n3\n%s\n%s\n0\nENDBLK'%\
               (self.layer,self.name.upper(),self.flag,_point(self.base),self.name.upper(),e)
            
class Layer(_Call):
    """Layer"""
    def __init__(self,name='pydxf',color=7,lineType='continuous',flag=64):
        self.name=name
        self.color=color
        self.lineType=lineType
        self.flag=flag
    def __str__(self):
        return '0\nLAYER\n2\n%s\n70\n%s\n62\n%s\n6\n%s'%\
               (self.name.upper(),self.flag,self.color,self.lineType)
    
class LineType(_Call):
    """Custom linetype"""
    def __init__(self,name='continuous',description='Solid line',elements=[],flag=64):
        # TODO: Implement lineType elements
        self.name=name
        self.description=description
        self.elements=copy.copy(elements)
        self.flag=flag
    def __str__(self):
        return '0\nLTYPE\n2\n%s\n70\n%s\n3\n%s\n72\n65\n73\n%s\n40\n0.0'%\
            (self.name.upper(),self.flag,self.description,len(self.elements))

class Style(_Call):
    """Text style"""
    def __init__(self,name='standard',flag=0,height=0,widthFactor=40,obliqueAngle=50,
                 mirror=0,lastHeight=1,font='arial.ttf',bigFont=''):
        self.name=name
        self.flag=flag
        self.height=height
        self.widthFactor=widthFactor
        self.obliqueAngle=obliqueAngle
        self.mirror=mirror
        self.lastHeight=lastHeight
        self.font=font
        self.bigFont=bigFont
    def __str__(self):
        return '0\nSTYLE\n2\n%s\n70\n%s\n40\n%s\n41\n%s\n50\n%s\n71\n%s\n42\n%s\n3\n%s\n4\n%s'%\
               (self.name.upper(),self.flag,self.flag,self.widthFactor,
                self.obliqueAngle,self.mirror,self.lastHeight,
                self.font.upper(),self.bigFont.upper())

class View(_Call):
    def __init__(self,name,flag=0,width=1,height=1,center=(0.5,0.5),
                 direction=(0,0,1),target=(0,0,0),lens=50,
                 frontClipping=0,backClipping=0,twist=0,mode=0):
        self.name=name
        self.flag=flag
        self.width=width
        self.height=height
        self.center=center
        self.direction=direction
        self.target=target
        self.lens=lens
        self.frontClipping=frontClipping
        self.backClipping=backClipping
        self.twist=twist
        self.mode=mode
    def __str__(self):
        return '0\nVIEW\n2\n%s\n70\n%s\n40\n%s\n%s\n41\n%s\n%s\n%s\n42\n%s\n43\n%s\n44\n%s\n50\n%s\n71\n%s'%\
               (self.name,self.flag,self.height,_point(self.center),self.width,
                _point(self.direction,1),_point(self.target,2),self.lens,
                self.frontClipping,self.backClipping,self.twist,self.mode)

def ViewByWindow(name,leftBottom=(0,0),rightTop=(1,1),**options):
    width=abs(rightTop[0]-leftBottom[0])
    height=abs(rightTop[1]-leftBottom[1])
    center=((rightTop[0]+leftBottom[0])*0.5,(rightTop[1]+leftBottom[1])*0.5)
    return View(name=name,width=width,height=height,center=center,**options)

#---drawing
class Drawing(_Collection):
    """Dxf drawing. Use append or any other list methods to add objects."""
    def __init__(self,insbase=(0.0,0.0,0.0),extmin=(0.0,0.0),extmax=(0.0,0.0),
                 layers=[Layer()],linetypes=[LineType()],styles=[Style()],blocks=[],
                 views=[],entities=None,fileName='test.dxf'):
        # TODO: replace list with None,arial
        if not entities:entities=[]
        _Collection.__init__(self,entities)
        self.insbase=insbase
        self.extmin=extmin
        self.extmax=extmax
        self.layers=copy.copy(layers)
        self.linetypes=copy.copy(linetypes)
        self.styles=copy.copy(styles)
        self.views=copy.copy(views)
        self.blocks=copy.copy(blocks)
        self.fileName=fileName
        #private
        self.acadver='9\n$ACADVER\n1\nAC1006'
    def _name(self,x):
        """Helper function for self._point"""
        return '9\n$%s'%x.upper()
    def _point(self,name,x):
        """Point setting from drawing like extmin,extmax,..."""
        return '%s\n%s'%(self._name(name),_point(x))
    def _section(self,name,x):
        """Sections like tables,blocks,entities,..."""
        if x:xstr='\n'+'\n'.join(x)
        else:xstr=''
        return '0\nSECTION\n2\n%s%s\n0\nENDSEC'%(name.upper(),xstr)
    def _table(self,name,x):
        """Tables like ltype,layer,style,..."""
        if x:xstr='\n'+'\n'.join(x)
        else:xstr=''
        return '0\nTABLE\n2\n%s\n70\n%s%s\n0\nENDTAB'%(name.upper(),len(x),xstr)
    def __str__(self):
        """Returns drawing as dxf string."""
        header=[self.acadver]+[self._point(attr,getattr(self,attr)) for attr in _HEADER_POINTS]
        header=self._section('header',header)
        
        tables=[self._table('ltype',[str(x) for x in self.linetypes]),
                self._table('layer',[str(x) for x in self.layers]),
                self._table('style',[str(x) for x in self.styles]),
                self._table('view',[str(x) for x in self.views]),
        ]
        tables=self._section('tables',tables)

        blocks=self._section('blocks',[str(x) for x in self.blocks])

        entities=self._section('entities',[str(x) for x in self.entities])
        
        all='\n'.join([header,tables,blocks,entities,'0\nEOF\n'])
        return all
    def saveas(self,fileName):
        self.fileName=fileName
        self.save()
    def save(self):
        test=open(self.fileName,'w')
        test.write(str(self))
        test.close()


#---extras
class Rectangle(_Entity):
    """Rectangle, creates lines."""
    def __init__(self,point=(0,0,0),width=1,height=1,solid=None,line=1,**common):
        _Entity.__init__(self,**common)
        self.point=point
        self.width=width
        self.height=height
        self.solid=solid
        self.line=line
    def __str__(self):
        result=''
        points=[self.point,(self.point[0]+self.width,self.point[1],self.point[2]),
            (self.point[0]+self.width,self.point[1]+self.height,self.point[2]),
            (self.point[0],self.point[1]+self.height,self.point[2]),self.point]
        if self.solid:
            result+='\n%s'%Solid(points=points[:-1],parent=self.solid)
        if self.line:
            for i in range(4):result+='\n%s'%\
                Line(points=[points[i],points[i+1]],parent=self)
        return result[1:]

class LineList(_Entity):
    """Like polyline, but built of individual lines."""
    def __init__(self,points=[],closed=0,**common):
        _Entity.__init__(self,**common)
        self.closed=closed
        self.points=copy.copy(points)
    def __str__(self):
        if self.closed:points=self.points+[self.points[0]]
        else: points=self.points
        result=''
        for i in range(len(points)-1):result+='\n%s'%\
            Line(points=[points[i],points[i+1]],parent=self)
        return result[1:]

PolyLine=LineList
#---test
def main():
    #Blocks
    b=Block('test')
    b.append(Solid(points=[(0,0,0),(1,0,0),(1,1,0),(0,1,0)],color=1))
    b.append(Arc(center=(1,0,0),color=2))
    
    #Drawing
    d=Drawing()
    #tables
    d.blocks.append(b)                      #table blocks
    d.styles.append(Style())                #table styles
    d.views.append(View('Normal'))          #table view
    d.views.append(ViewByWindow('Window',leftBottom=(1,0),rightTop=(2,1)))  #idem

    #entities
    d.append(Circle(center=(1,1,0),color=3))
    d.append(Face(points=[(0,0,0),(1,0,0),(1,1,0),(0,1,0)],color=4))
    d.append(Insert('test',point=(3,3,3),cols=5,colspacing=2))
    d.append(Line(points=[(0,0,0),(1,1,1)]))
    d.append(Mtext('Click on Ads\nmultiple lines with mtext',point=(1,1,1),color=5,rotation=90))
    d.append(Text('Please donate!',point=(3,0,1)))
    d.append(Rectangle(point=(2,2,2),width=4,height=3,color=6,solid=Solid(color=2)))
    d.append(Solid(points=[(4,4,0),(5,4,0),(7,8,0),(9,9,0)],color=3))
    d.append(PolyLine(points=[(1,1,1),(2,1,1),(2,2,1),(1,2,1)],closed=1,color=1))
    
    d.saveas('c:\\test.dxf')

if __name__=='__main__':main()