# SPDX-License-Identifier: GPL-2.0-or-later

#dxfLibrary.py : provides functions for generating DXF files
# --------------------------------------------------------------------------
__version__ = "v1.35 - 2010.06.23"
__author__ = "Stani Michiels(Stani), Remigiusz Fiedler(migius)"
__license__ = "GPL"
__url__ = "http://wiki.blender.org/index.php/Extensions:2.4/Py/Scripts/Export/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 version (needs extended file header)
- add support for DXF-SPLINEs (possible first in DXFr14 version)
- add support for DXF-MTEXT
- add user preset for floating point precision (3-16?)

History
v1.35 - 2010.06.23 by migius
 - added (as default) writing to DXF file without RAM-buffering: faster and low-RAM-machines friendly
v1.34 - 2010.06.20 by migius
 - bugfix POLYFACE
 - added DXF-flags for POLYLINE and VERTEX class (NURBS-export)
v1.33 - 2009.07.03 by migius
 - fix MTEXT newline bug (not supported by DXF-Exporter yet)
 - 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)
# --------------------------------------------------------------------------

#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 developers)
_HEADER_POINTS=['insbase','extmin','extmax']

#---helper functions-----------------------------------
def _point(x,index=0):
    """Convert tuple to a dxf point"""
    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 flag 70
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

#---polyline flag 75, = curve type
QUADRIC_NURBS = 5
CUBIC_NURBS = 6
BEZIER_CURVE = 8


#---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))
        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],flag70=0,flag75=0,width=None,**common):
        #width = number, or width = list [width_start=None, width_end=None]
        #for 2d-polyline: points = [ [[x, y, z], vflag=None, [width_start=None, width_end=None], bulge=0 or None] ...]
        #for 3d-polyline: points = [ [[x, y, z], vflag=None], ...]
        #for polyface: points = [points_list, faces_list]
        _Entity.__init__(self,**common)
        self.points=points
        self.org_point=org_point
        self.pflag70 = flag70
        self.pflag75 = flag75
        self.polyface = False
        self.polyline2d = False
        self.faces = [] # dummy value
        self.width= None # dummy value
        if self.pflag70 & 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.pflag70 & 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.pflag70)
        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])
        if self.pflag75:
            result+=' 75\n%s\n' %self.pflag75
        for point in self.points:
            result+='  0\nVERTEX\n'
            result+='  8\n%s\n' %self.layer
            if self.polyface:
                result+='%s\n' %_point(point)
                result+=' 70\n192\n'
            elif self.polyline2d:
                result+='%s\n' %_point(point[0])
                flag = point[1]
                if len(point)>2:
                    [width1, width2] = point[2]
                    if width1!=None: result+=' 40\n%s\n' %width1
                    if width2!=None: result+=' 41\n%s\n' %width2
                if len(point)==4:
                    bulge = point[3]
                    if bulge: result+=' 42\n%s\n' %bulge
                if flag:
                        result+=' 70\n%s\n' %flag
            else:
                result+='%s\n' %_point(point[0])
                flag = point[1]
                if flag:
                        result+=' 70\n%s\n' %flag

        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 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' %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=50.0,
                frontClipping=0.0,
                backClipping=0.0,
                snap_rotation=0.0,
                twist=0.0,
                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=1.0,
            height=1.0,
            center=(0.5,0.5),
            direction=(0.0,0.0,1.0),
            target=(0.0,0.0,0.0),
            lens=50.0,
            frontClipping=0.0,
            backClipping=0.0,
            twist=0.0,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
        #print 'deb: blocks=',blocks #----------
        #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 _write_section(self,file,name,data):
        file.write('  0\nSECTION\n  2\n%s\n'%name.upper())
        for x in data:
            file.write(str(x))
        file.write('  0\nENDSEC\n')

    def saveas(self,fileName,buffer=0):
        """Writes DXF file. Needs target file name. If optional parameter buffer>0, then switch to old behavior: store entire output string in RAM.
        """
        self.fileName=fileName
        if buffer: self.save()
        else: self.export()

    def save(self):
        outfile=open(self.fileName,'w')
        outfile.write(str(self))
        outfile.close()

    def export(self):
        outfile=open(self.fileName,'w')
        header=[self.acadver]+[self._point(attr,getattr(self,attr))+'\n' for attr in _HEADER_POINTS]
        self._write_section(outfile,'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]),
            ]
        self._write_section(outfile,'tables',tables)
        self._write_section(outfile,'blocks',self.blocks)
        self._write_section(outfile,'entities',self.entities)
        outfile.write('  0\nEOF\n')
        outfile.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][0],points[i+1][0]],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()
