dxfLibrary.py

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#dxfLibrary.py : provides functions for generating DXF files
# --------------------------------------------------------------------------
__version__ = "v1.33 - 2009.06.16"
__author__ = "Stani Michiels(Stani), Remigiusz Fiedler(migius)"
__license__ = "GPL"
__url__ = "http://wiki.blender.org/index.php/Scripts/Manual/Export/autodesk_dxf"
__bpydoc__ ="""The library to export geometry data to DXF format r12 version.

Copyright %s
Version %s
License %s
Homepage %s

See the homepage for documentation.
Dedicated thread on BlenderArtists: http://blenderartists.org/forum/showthread.php?t=136439

IDEAs:
-

TODO:
- add support for DXFr14 (needs extended file header)
- add support for SPLINEs (possible first in DXFr14 version)
- add user preset for floating point precision (3-16?)

History
v1.33 - 2009.06.16 by migius
 - modif _point(): converts all coords to floats
 - modif LineType class: implement elements
 - added VPORT class, incl. defaults
 - fix Insert class
v1.32 - 2009.06.06 by migius
 - modif Style class: changed defaults to widthFactor=1.0, obliqueAngle=0.0
 - modif Text class: alignment parameter reactivated
v1.31 - 2009.06.02 by migius
 - modif _Entity class: added paperspace,elevation
v1.30 - 2009.05.28 by migius
 - bugfix 3dPOLYLINE/POLYFACE: VERTEX needs x,y,z coordinates, index starts with 1 not 0
v1.29 - 2008.12.28 by Yorik
 - modif POLYLINE to support bulge segments
v1.28 - 2008.12.13 by Steeve/BlenderArtists
 - bugfix for EXTMIN/EXTMAX to suit Cycas-CAD
v1.27 - 2008.10.07 by migius
 - beautifying output code: keys whitespace prefix
 - refactoring DXF-strings format: NewLine moved to the end of
v1.26 - 2008.10.05 by migius
 - modif POLYLINE to support POLYFACE
v1.25 - 2008.09.28 by migius
 - modif FACE class for r12
v1.24 - 2008.09.27 by migius
 - modif POLYLINE class for r12
 - changing output format from r9 to r12(AC1009)
v1.1 (20/6/2005) by www.stani.be/python/sdxf
 - Python library to generate dxf drawings
______________________________________________________________
""" % (__author__,__version__,__license__,__url__)

# --------------------------------------------------------------------------
# DXF Library: copyright (C) 2005 by Stani Michiels (AKA Stani)
#                       2008/2009 modif by Remigiusz Fiedler (AKA migius)
# --------------------------------------------------------------------------
# ***** BEGIN GPL LICENSE BLOCK *****
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# ***** END GPL LICENCE BLOCK *****


#import Blender
#from Blender import Mathutils, Window, Scene, sys, Draw
#import BPyMessages

try:
        import copy
        #from struct import pack
except:
        copy = None

####1) Private (only for developpers)
_HEADER_POINTS=['insbase','extmin','extmax']

#---helper functions-----------------------------------
def _point(x,index=0):
        """Convert tuple to a dxf point"""
        #print 'deb: _point=', x #-------------
        return '\n'.join([' %s\n%s'%((i+1)*10+index,float(x[i])) for i in range(len(x))])

def _points(plist):
        """Convert a list of tuples to dxf points"""
        out = '\n'.join([_point(plist[i],i)for i in range(len(plist))])
        return out

#---base classes----------------------------------------
class _Call:
        """Makes a callable class."""
        def copy(self):
                """Returns a copy."""
                return copy.deepcopy(self)

        def __call__(self,**attrs):
                """Returns a copy with modified attributes."""
                copied=self.copy()
                for attr in attrs:setattr(copied,attr,attrs[attr])
                return copied

#-------------------------------------------------------
class _Entity(_Call):
        """Base class for _common group codes for entities."""
        def __init__(self,paperspace=None,color=None,layer='0',
                                 lineType=None,lineTypeScale=None,lineWeight=None,
                                 extrusion=None,elevation=None,thickness=None,
                                 parent=None):
                """None values will be omitted."""
                self.paperspace   = paperspace
                self.color                = color
                self.layer                = layer
                self.lineType      = lineType
                self.lineTypeScale  = lineTypeScale
                self.lineWeight  = lineWeight
                self.extrusion    = extrusion
                self.elevation    = elevation
                self.thickness    = thickness
                #self.visible     = visible
                self.parent              = parent

        def _common(self):
                """Return common group codes as a string."""
                if self.parent:parent=self.parent
                else:parent=self
                result =''
                if parent.paperspace==1: result+='  67\n1\n'
                if parent.layer!=None: result+='  8\n%s\n'%parent.layer
                if parent.color!=None: result+=' 62\n%s\n'%parent.color
                if parent.lineType!=None: result+='  6\n%s\n'%parent.lineType
                # TODO: if parent.lineWeight!=None: result+='370\n%s\n'%parent.lineWeight
                # TODO: if parent.visible!=None: result+='60\n%s\n'%parent.visible
                if parent.lineTypeScale!=None: result+=' 48\n%s\n'%parent.lineTypeScale
                if parent.elevation!=None: result+=' 38\n%s\n'%parent.elevation
                if parent.thickness!=None: result+=' 39\n%s\n'%parent.thickness
                if parent.extrusion!=None: result+='%s\n'%_point(parent.extrusion,200)
                return result

#--------------------------
class _Entities:
        """Base class to deal with composed objects."""
        def __dxf__(self):
                return []

        def __str__(self):
                return ''.join([str(x) for x in self.__dxf__()])

#--------------------------
class _Collection(_Call):
        """Base class to expose entities methods to main object."""
        def __init__(self,entities=[]):
                self.entities=copy.copy(entities)
                #link entities methods to drawing
                for attr in dir(self.entities):
                        if attr[0]!='_':
                                attrObject=getattr(self.entities,attr)
                                if callable(attrObject):
                                        setattr(self,attr,attrObject)

####2) Constants
#---color values
BYBLOCK=0
BYLAYER=256

#---block-type flags (bit coded values, may be combined):
ANONYMOUS =1  # This is an anonymous block generated by hatching, associative dimensioning, other internal operations, or an application
NON_CONSTANT_ATTRIBUTES =2  # This block has non-constant attribute definitions (this bit is not set if the block has any attribute definitions that are constant, or has no attribute definitions at all)
XREF =4  # This block is an external reference (xref)
XREF_OVERLAY =8  # This block is an xref overlay
EXTERNAL =16 # This block is externally dependent
RESOLVED =32 # This is a resolved external reference, or dependent of an external reference (ignored on input)
REFERENCED =64 # This definition is a referenced external reference (ignored on input)

#---mtext flags
#attachment point
TOP_LEFT = 1
TOP_CENTER = 2
TOP_RIGHT = 3
MIDDLE_LEFT = 4
MIDDLE_CENTER = 5
MIDDLE_RIGHT    = 6
BOTTOM_LEFT = 7
BOTTOM_CENTER = 8
BOTTOM_RIGHT = 9
#drawing direction
LEFT_RIGHT = 1
TOP_BOTTOM = 3
BY_STYLE = 5 #the flow direction is inherited from the associated text style
#line spacing style (optional):
AT_LEAST = 1 #taller characters will override
EXACT = 2 #taller characters will not override

#---polyline flags
CLOSED =1         # This is a closed polyline (or a polygon mesh closed in the M direction)
CURVE_FIT =2      # Curve-fit vertices have been added
SPLINE_FIT =4     # Spline-fit vertices have been added
POLYLINE_3D =8    # This is a 3D polyline
POLYGON_MESH =16         # This is a 3D polygon mesh
CLOSED_N =32     # The polygon mesh is closed in the N direction
POLYFACE_MESH =64        # The polyline is a polyface mesh
CONTINOUS_LINETYPE_PATTERN =128 # The linetype pattern is generated continuously around the vertices of this polyline

#---text flags
#horizontal
LEFT = 0
CENTER = 1
RIGHT = 2
ALIGNED = 3 #if vertical alignment = 0
MIDDLE = 4 #if vertical alignment = 0
FIT = 5 #if vertical alignment = 0
#vertical
BASELINE = 0
BOTTOM  = 1
MIDDLE = 2
TOP = 3

####3) Classes
#---entitities -----------------------------------------------
#--------------------------
class Arc(_Entity):
        """Arc, angles in degrees."""
        def __init__(self,center=(0,0,0),radius=1,
                                 startAngle=0.0,endAngle=90,**common):
                """Angles in degrees."""
                _Entity.__init__(self,**common)
                self.center=center
                self.radius=radius
                self.startAngle=startAngle
                self.endAngle=endAngle
        def __str__(self):
                return '  0\nARC\n%s%s\n 40\n%s\n 50\n%s\n 51\n%s\n'%\
                           (self._common(),_point(self.center),
                                self.radius,self.startAngle,self.endAngle)

#-----------------------------------------------
class Circle(_Entity):
        """Circle"""
        def __init__(self,center=(0,0,0),radius=1,**common):
                _Entity.__init__(self,**common)
                self.center=center
                self.radius=radius
        def __str__(self):
                return '  0\nCIRCLE\n%s%s\n 40\n%s\n'%\
                           (self._common(),_point(self.center),self.radius)

#-----------------------------------------------
class Face(_Entity):
        """3dface"""
        def __init__(self,points,**common):
                _Entity.__init__(self,**common)
                while len(points)<4: #fix for r12 format
                        points.append(points[-1])
                self.points=points
                
        def __str__(self):
                out = '  0\n3DFACE\n%s%s\n' %(self._common(),_points(self.points))
                #print 'deb:out=', out #-------------------
                return out

#-----------------------------------------------
class Insert(_Entity):
        """Block instance."""
        def __init__(self,name,point=(0,0,0),
                                 xscale=None,yscale=None,zscale=None,
                                 cols=None,colspacing=None,rows=None,rowspacing=None,
                                 rotation=None,
                                 **common):
                _Entity.__init__(self,**common)
                self.name=name
                self.point=point
                self.xscale=xscale
                self.yscale=yscale
                self.zscale=zscale
                self.cols=cols
                self.colspacing=colspacing
                self.rows=rows
                self.rowspacing=rowspacing
                self.rotation=rotation

        def __str__(self):
                result='  0\nINSERT\n  2\n%s\n%s%s\n'%\
                                (self.name,self._common(),_point(self.point))
                if self.xscale!=None:result+=' 41\n%s\n'%self.xscale
                if self.yscale!=None:result+=' 42\n%s\n'%self.yscale
                if self.zscale!=None:result+=' 43\n%s\n'%self.zscale
                if self.rotation:result+=' 50\n%s\n'%self.rotation
                if self.cols!=None:result+=' 70\n%s\n'%self.cols
                if self.colspacing!=None:result+=' 44\n%s\n'%self.colspacing
                if self.rows!=None:result+=' 71\n%s\n'%self.rows
                if self.rowspacing!=None:result+=' 45\n%s\n'%self.rowspacing
                return result

#-----------------------------------------------
class Line(_Entity):
        """Line"""
        def __init__(self,points,**common):
                _Entity.__init__(self,**common)
                self.points=points
        def __str__(self):
                return '  0\nLINE\n%s%s\n' %(
                                self._common(), _points(self.points))


#-----------------------------------------------
class PolyLine(_Entity):
        def __init__(self,points,org_point=[0,0,0],flag=0,width=None,**common):
                #width = number, or width = list [width_start=None, width_end=None]
                #for 2d-polyline: points = [ [x, y, z, width_start=None, width_end=None, bulge=0 or None], ...]
                #for 3d-polyline: points = [ [x, y, z], ...]
                #for polyface: points = [points_list, faces_list]
                _Entity.__init__(self,**common)
                self.points=points
                self.org_point=org_point
                self.flag=flag
                self.polyface = False
                self.polyline2d = False
                self.faces = [] # dummy value
                self.width= None # dummy value
                if self.flag & POLYFACE_MESH:
                        self.polyface=True
                        self.points=points[0]
                        self.faces=points[1]
                        self.p_count=len(self.points)
                        self.f_count=len(self.faces)
                elif not self.flag & POLYLINE_3D:
                        self.polyline2d = True
                        if width:
                                if type(width)!='list':
                                        width=[width,width]
                                self.width=width

        def __str__(self):
                result= '  0\nPOLYLINE\n%s 70\n%s\n' %(self._common(),self.flag)
                result+=' 66\n1\n'
                result+='%s\n' %_point(self.org_point)
                if self.polyface:
                        result+=' 71\n%s\n' %self.p_count
                        result+=' 72\n%s\n' %self.f_count
                elif self.polyline2d:
                        if self.width!=None: result+=' 40\n%s\n 41\n%s\n' %(self.width[0],self.width[1])
                for point in self.points:
                        result+='  0\nVERTEX\n'
                        result+='  8\n%s\n' %self.layer
                        if self.polyface:
                                result+='%s\n' %_point(point[0:3])
                                result+=' 70\n192\n'
                        elif self.polyline2d:
                                result+='%s\n' %_point(point[0:2])
                                if len(point)>4:
                                        width1, width2 = point[3], point[4]
                                        if width1!=None: result+=' 40\n%s\n' %width1
                                        if width2!=None: result+=' 41\n%s\n' %width2
                                if len(point)==6:
                                        bulge = point[5]
                                        if bulge: result+=' 42\n%s\n' %bulge
                        else:
                                result+='%s\n' %_point(point[0:3])
                for face in self.faces:
                        result+='  0\nVERTEX\n'
                        result+='  8\n%s\n' %self.layer
                        result+='%s\n' %_point(self.org_point)
                        result+=' 70\n128\n'
                        result+=' 71\n%s\n' %face[0]
                        result+=' 72\n%s\n' %face[1]
                        result+=' 73\n%s\n' %face[2]
                        if len(face)==4: result+=' 74\n%s\n' %face[3]
                result+='  0\nSEQEND\n'
                result+='  8\n%s\n' %self.layer
                return result

#-----------------------------------------------
class Point(_Entity):
        """Point."""
        def __init__(self,points=None,**common):
                _Entity.__init__(self,**common)
                self.points=points
        def __str__(self): # TODO:
                return '  0\nPOINT\n%s%s\n' %(self._common(),
                         _points(self.points)
                        )

#-----------------------------------------------
class Solid(_Entity):
        """Colored solid fill."""
        def __init__(self,points=None,**common):
                _Entity.__init__(self,**common)
                self.points=points
        def __str__(self):
                return '  0\nSOLID\n%s%s\n' %(self._common(),
                         _points(self.points[:2]+[self.points[3],self.points[2]])
                        )


#-----------------------------------------------
class Dimension(_Entity):
        """Basic dimension entity"""
        def __init__(self,point,start,end,**common):
                _Entity.__init__(self,**common)
                self.points=[point,start,end]
        def __str__(self):
                result = '  0\nDIMENSION\n%s' %(self._common())
                result+=' 3\nStandard\n'
                result+=' 70\n1\n'
                result+='%s\n' %_point(self.points[0])
                result+='%s\n' %_point(self.points[1],3)
                result+='%s\n' %_point(self.points[2],4)
                print result
                return result

#-----------------------------------------------
class Text(_Entity):
        """Single text line."""
        def __init__(self,text='',point=(0,0,0),alignment=None,
                                 flag=None,height=1,justifyhor=None,justifyver=None,
                                 rotation=None,obliqueAngle=None,style=None,xscale=None,**common):
                _Entity.__init__(self,**common)
                self.text=text
                self.point=point
                self.alignment=alignment
                self.flag=flag
                self.height=height
                self.justifyhor=justifyhor
                self.justifyver=justifyver
                self.rotation=rotation
                self.obliqueAngle=obliqueAngle
                self.style=style
                self.xscale=xscale
        def __str__(self):
                result= '  0\nTEXT\n%s%s\n 40\n%s\n  1\n%s\n'%\
                                (self._common(),_point(self.point),self.height,self.text)
                if self.rotation: result+=' 50\n%s\n'%self.rotation
                if self.xscale: result+=' 41\n%s\n'%self.xscale
                if self.obliqueAngle: result+=' 51\n%s\n'%self.obliqueAngle
                if self.style: result+='  7\n%s\n'%self.style
                if self.flag: result+=' 71\n%s\n'%self.flag
                if self.justifyhor: result+=' 72\n%s\n'%self.justifyhor
                if self.alignment: result+='%s\n'%_point(self.alignment,1)
                if self.justifyver: result+=' 73\n%s\n'%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+='%s\n'%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+='3\n%s\n'%input[:250]
##                      input=input[250:]
##              text+='1\n%s\n'%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\n'%\
##                              (self._common(),_point(self.point),self.charHeight,self.width,
##                               self.attachment,self.direction,text,
##                               self.height,
##                               self.rotation)
##              if self.style:result+='7\n%s\n'%self.style
##              if self.xdirection:result+='%s\n'%_point(self.xdirection,1)
##              if self.charWidth:result+='42\n%s\n'%self.charWidth
##              if self.spacingStyle:result+='73\n%s\n'%self.spacingStyle
##              if self.spacingFactor:result+='44\n%s\n'%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): # TODO:
                e=''.join([str(x)for x in self.entities])
                return '  0\nBLOCK\n  8\n%s\n  2\n%s\n 70\n%s\n%s\n  3\n%s\n%s  0\nENDBLK\n'%\
                           (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\n  2\n%s\n 70\n%s\n 62\n%s\n  6\n%s\n'%\
                           (self.name.upper(),self.flag,self.color,self.lineType)

#-----------------------------------------------
class LineType(_Call):
        """Custom linetype"""
        def __init__(self,name='CONTINUOUS',description='Solid line',elements=[0.0],flag=0):
                self.name=name
                self.description=description
                self.elements=copy.copy(elements)
                self.flag=flag
        def __str__(self):
                result = '  0\nLTYPE\n  2\n%s\n 70\n%s\n  3\n%s\n 72\n65\n'%\
                        (self.name.upper(),self.flag,self.description)
                if self.elements:
                        elements = ' 73\n%s\n' %(len(self.elements)-1)
                        elements += ' 40\n%s\n' %(self.elements[0])
                        for e in self.elements[1:]:
                                elements += ' 49\n%s\n' %e
                        result += elements
                return result
                 

#-----------------------------------------------
class Style(_Call):
        """Text style"""
        def __init__(self,name='standard',flag=0,height=0,widthFactor=1.0,obliqueAngle=0.0,
                                 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\n  2\n%s\n 70\n%s\n 40\n%s\n 41\n%s\n 50\n%s\n 71\n%s\n 42\n%s\n 3\n%s\n 4\n%s\n'%\
                           (self.name.upper(),self.flag,self.flag,self.widthFactor,
                                self.obliqueAngle,self.mirror,self.lastHeight,
                                self.font.upper(),self.bigFont.upper())

#-----------------------------------------------
class VPort(_Call):
        def __init__(self,name,flag=0,
                                leftBottom=(0.0,0.0),
                                rightTop=(1.0,1.0),
                                center=(0.5,0.5),
                                snap_base=(0.0,0.0),
                                snap_spacing=(0.1,0.1),
                                grid_spacing=(0.1,0.1),
                                direction=(0.0,0.0,1.0),
                                target=(0.0,0.0,0.0),
                                height=1.0,
                                ratio=1.0,
                                lens=50,
                                frontClipping=0,
                                backClipping=0,
                                snap_rotation=0,
                                twist=0,
                                mode=0,
                                circle_zoom=100,
                                fast_zoom=1,
                                ucsicon=1,
                                snap_on=0,
                                grid_on=0,
                                snap_style=0,
                                snap_isopair=0
                                ):
                self.name=name
                self.flag=flag
                self.leftBottom=leftBottom
                self.rightTop=rightTop
                self.center=center
                self.snap_base=snap_base
                self.snap_spacing=snap_spacing
                self.grid_spacing=grid_spacing
                self.direction=direction
                self.target=target
                self.height=float(height)
                self.ratio=float(ratio)
                self.lens=float(lens)
                self.frontClipping=float(frontClipping)
                self.backClipping=float(backClipping)
                self.snap_rotation=float(snap_rotation)
                self.twist=float(twist)
                self.mode=mode
                self.circle_zoom=circle_zoom
                self.fast_zoom=fast_zoom
                self.ucsicon=ucsicon
                self.snap_on=snap_on
                self.grid_on=grid_on
                self.snap_style=snap_style
                self.snap_isopair=snap_isopair
        def __str__(self):
                output = ['  0', 'VPORT',
                        '  2', self.name,
                        ' 70', self.flag,
                        _point(self.leftBottom),
                        _point(self.rightTop,1),
                        _point(self.center,2), # View center point (in DCS)
                        _point(self.snap_base,3),
                        _point(self.snap_spacing,4),
                        _point(self.grid_spacing,5),
                        _point(self.direction,6), #view direction from target (in WCS)
                        _point(self.target,7),
                        ' 40', self.height,
                        ' 41', self.ratio,
                        ' 42', self.lens,
                        ' 43', self.frontClipping,
                        ' 44', self.backClipping,
                        ' 50', self.snap_rotation,
                        ' 51', self.twist,
                        ' 71', self.mode,
                        ' 72', self.circle_zoom,
                        ' 73', self.fast_zoom,
                        ' 74', self.ucsicon,
                        ' 75', self.snap_on,
                        ' 76', self.grid_on,
                        ' 77', self.snap_style,
                        ' 78', self.snap_isopair
                        ]

                output_str = ''
                for s in output:
                        output_str += '%s\n' %s
                return output_str



#-----------------------------------------------
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=float(width)
                self.height=float(height)
                self.center=center
                self.direction=direction
                self.target=target
                self.lens=float(lens)
                self.frontClipping=float(frontClipping)
                self.backClipping=float(backClipping)
                self.twist=float(twist)
                self.mode=mode
        def __str__(self):
                output = ['  0', 'VIEW',
                        '  2', self.name,
                        ' 70', self.flag,
                        ' 40', self.height,
                        _point(self.center),
                        ' 41', self.width,
                        _point(self.direction,1),
                        _point(self.target,2),
                        ' 42', self.lens,
                        ' 43', self.frontClipping,
                        ' 44', self.backClipping,
                        ' 50', self.twist,
                        ' 71', self.mode
                        ]
                output_str = ''
                for s in output:
                        output_str += '%s\n' %s
                return output_str

#-----------------------------------------------
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=(0.0,0.0,0.0),extmax=(0.0,0.0,0.0),
                                 layers=[Layer()],linetypes=[LineType()],styles=[Style()],blocks=[],
                                 views=[],vports=[],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.vports=copy.copy(vports)
                self.blocks=copy.copy(blocks)
                self.fileName=fileName
                #private
                #self.acadver='9\n$ACADVER\n1\nAC1006\n'
                self.acadver='  9\n$ACADVER\n  1\nAC1009\n'
                """DXF AutoCAD-Release format codes
                AC1021  2008, 2007 
                AC1018  2006, 2005, 2004 
                AC1015  2002, 2000i, 2000 
                AC1014  R14,14.01 
                AC1012  R13    
                AC1009  R12,11 
                AC1006  R10    
                AC1004  R9    
                AC1002  R2.6  
                AC1.50  R2.05 
                """

        def _name(self,x):
                """Helper function for self._point"""
                return '  9\n$%s\n' %x.upper()

        def _point(self,name,x):
                """Point setting from drawing like extmin,extmax,..."""
                return '%s%s' %(self._name(name),_point(x))

        def _section(self,name,x):
                """Sections like tables,blocks,entities,..."""
                if x: xstr=''.join(x)
                else: xstr=''
                return '  0\nSECTION\n  2\n%s\n%s  0\nENDSEC\n'%(name.upper(),xstr)

        def _table(self,name,x):
                """Tables like ltype,layer,style,..."""
                if x: xstr=''.join(x)
                else: xstr=''
                return '  0\nTABLE\n  2\n%s\n 70\n%s\n%s  0\nENDTAB\n'%(name.upper(),len(x),xstr)

        def __str__(self):
                """Returns drawing as dxf string."""
                header=[self.acadver]+[self._point(attr,getattr(self,attr))+'\n' for attr in _HEADER_POINTS]
                header=self._section('header',header)

                tables=[self._table('vport',[str(x) for x in self.vports]),
                                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=''.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+= Solid(points=points[:-1],parent=self.solid)
                if self.line:
                        for i in range(4):
                                result+= 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=[],org_point=[0,0,0],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+= Line(points=[points[i],points[i+1]],parent=self)
                return result[1:]

#-----------------------------------------------------
def test():
        #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)],flag=1,color=1))

        #d.saveas('c:\\test.dxf')
        d.saveas('test.dxf')

#-----------------------------------------------------
if __name__=='__main__':
        if not copy:
                Draw.PupMenu('Error%t|This script requires a full python install')
        else: test()