#!BPY

# """
# Name: 'Drawing eXchange Format (.dxf)'
# Blender: 243
# Group: 'Import'
# Tooltip: 'Import DXF file.'
# """
__author__ = 'Kitsu (Ed Blake)'
__version__ = '0.9 1/2007'
__url__ = ["elysiun.com", "BlenderArtists.org"]
__email__ = ["Kitsune_e@yahoo.com"]
__bpydoc__ = """\
This is a Blender import script for dxf files.

This script imports the dxf Geometery from dxf versions 2007 and earlier.

Supported:<br>
   At this time only mesh based imports are supported.<br>
   Future support for all curve import is planned.<br>
  <br>
Currently Supported DXF Ojects:<br>
     Lines<br>
     LightWeight polylines<br>
     True polylines<br>
     Text<br>
     Mtext<br>
     Circles<br>
     Arcs<br>
     Ellipses<br>
     Blocks<br>
     3Dfaces<br>

Known issues:<br>
   Does not convert perfectly between Object Coordinate System (OCS) 
   and World Coordinate System (WCS).  Only rudimentary support for
   true polylines have been implimented - splines/fitted curves/
   3d plines/polymeshes are not supported.
   No support for most 3d entities. Doesn't support the new style object 
   visability.  There are problems importing some curves/arcs/circles.

Notes:<br>
   This is primarally a 2d drawing release.  Currently only support for
   3d faces has been added.
   Blocks are created on layer 19 then referenced at each insert point.  The
   insert point is designated with a small 3d crosshair.  This handle does not render.

"""

# --------------------------------------------------------------------------
# DXF Import v0.9 by Ed Blake (AKA Kitsu)
# --------------------------------------------------------------------------
# ***** 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 *
Sys = sys

from dxfReader import readDXF, get_name, get_layer
from dxfReader import Object as dxfObject
from dxfColorMap import color_map
from math import *

try:
    import os
    if os.name:# != 'mac':
        import psyco
        psyco.log()
        psyco.full(memory=100)
        psyco.profile(0.05, memory=100)
        psyco.profile(0.2)
except ImportError:
    pass

SCENE = Scene.GetCurrent()
WORLDX = Mathutils.Vector((1,0,0))
AUTO = BezTriple.HandleTypes.AUTO
BYLAYER=256
"""This module provides wrapper objects for dxf entities.
    
    The wrappers expect a "dxf object" as input.  The dxf object is
    an object with a type and a data attribute.  Type is a lowercase 
    string matching the 0 code of a dxf entity.  Data is a list containing
    dxf objects or lists of [code, data] pairs.
    
    This module is not general, and is only for dxf import.
"""

# from Stani's dxf writer v1.1 (c)www.stani.be (GPL)
#---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
class Layer:
    """Class for objects representing dxf layers."""
    
    def __init__(self, obj, name=None, color=None, frozen=None):
        """Expects an entity object of type line as input."""
        self.type = obj.type
        self.data = obj.data[:]
    
        if name:
            self.name = name
        else:
            self.name = obj.get_type(2)[0]
        if color:
            self.color = color
        else:
            self.color = obj.get_type(62)[0]
        if frozen:
            self.frozen = frozen
        else:
            self.flags = obj.get_type(70)[0]
            self.frozen = self.flags&1
            
    def __repr__(self):
        return "%s: name - %s, color - %s" %(self.__class__.__name__, self.name, self.color)
    


class Line:
    """Class for objects representing dxf lines."""
    
    def __init__(self, obj):
        """Expects an entity object of type line as input."""
        if not obj.type == 'line':
            raise TypeError, "Wrong type %s for line object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
        
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
        
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.points = self.get_points(obj.data)
    
    
    
    
    def get_points(self, data):
        """Gets start and end points for a line type object.
        
        Lines have a fixed number of points (two) and fixed codes for each value.
        """
        
        # start x, y, z and end x, y, z = 0
        sx, sy, sz, ex, ey, ez = 0, 0, 0, 0, 0, 0
        for item in data:
            if item[0] == 10:   # 10 = x
                sx = item[1]
            elif item[0] == 20: # 20 = y
                sy = item[1]
            elif item[0] == 30: # 30 = z
                sz = item[1]
            elif item[0] == 11: # 11 = x
                ex = item[1]
            elif item[0] == 21: # 21 = y
                ey = item[1]
            elif item[0] == 31: # 31 = z
                ez = item[1]
        return [[sx, sy, sz], [ex, ey, ez]]
    
    
    
    def __repr__(self):
        return "%s: layer - %s, points - %s" %(self.__class__.__name__, self.layer, self.points)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import lines into Blender."""
        # Generate the geometery
        points = self.points
        edges = [[0, 1]]
        
        me = Mesh.New('line')          # create a new mesh
        
        me.verts.extend(points)          # add vertices to mesh
        me.edges.extend(edges)           # add edges to the mesh
        
        # Now Create an object
        ob = Object.New('Mesh', 'line')  # link mesh to an object
        ob.link(me)
        
        return ob
        
    


class LWpolyline:
    """Class for objects representing dxf LWpolylines."""
    
    def __init__(self, obj):
        """Expects an entity object of type lwpolyline as input."""
        if not obj.type == 'lwpolyline':
            raise TypeError, "Wrong type %s for polyline object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.num_points = obj.get_type(90)[0]
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        self.elevation = obj.get_type(38)
        if self.elevation:
            self.elevation = self.elevation[0]
        else:
            self.elevation = 0
            
        self.flags = obj.get_type(70)
        if self.flags:
            self.flags = self.flags[0]
        else:
            self.flags = 0
        
        self.closed = self.flags&1 # byte coded, 1 = closed, 128 = plinegen
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.points = self.get_points(obj.data)
        self.extrusion = self.get_extrusion(obj.data)
    
    
    
    
    
    
    def get_points(self, data):
        """Gets points for a polyline type object.
        
        Polylines have no fixed number of verts, and 
        each vert can have a number of properties.
        Verts should be coded as 
        10:xvalue
        20:yvalue
        40:startwidth or 0
        41:endwidth or 0
        42:bulge or 0
        for each vert
        """
        num = self.num_points
        point = None
        points = []
        for item in data:
            if item[0] == 10:   # 10 = x
                if point:
                    points.append(point)
                point = Vertex()
                point.x = item[1]
            elif item[0] == 20: # 20 = y
                point.y = item[1]
            elif item[0] == 40: # 40 = start width
                point.swidth = item[1]
            elif item[0] == 41: # 41 = end width
                point.ewidth = item[1]
            elif item[0] == 42: # 42 = bulge
                point.bulge = item[1]
        points.append(point)
        return points
    
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, points - %s" %(self.__class__.__name__, self.layer, self.points)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import plines into Blender."""
        # Generate the geometery
        points = []
        for i in range(len(self.points)):
            point = self.points[i]
            if not point.bulge:
                points.append(point.loc)
            elif point.bulge and i < len(self.points)-1:# > 0:
                center, radius, start, end = solveBulge(point, self.points[i+1])
                #print center, radius, start, end
                verts, nosense = drawArc(center, radius, start, end)
                verts.pop(0) # remove first
                verts.pop() #remove last
                if point.bulge >= 0:
                    verts.reverse()
                points.extend(verts)
        edges = [[num, num+1] for num in range(len(points)-1)]
        if self.closed:
            edges.append([len(self.points)-1, 0])
    
        me = Mesh.New('lwpline')          # create a new mesh
        
        me.verts.extend(points)          # add vertices to mesh
        me.edges.extend(edges)           # add edges to the mesh
        
        # Now Create an object
        ob = Object.New('Mesh', 'lwpline')  # link mesh to an object
        ob.link(me)
        transform(self.extrusion, ob)
        ob.LocZ = self.elevation
        
        return ob
        


class Polyline:
    """Class for objects representing dxf LWpolylines."""
    
    def __init__(self, obj):
        """Expects an entity object of type polyline as input."""
        if not obj.type == 'polyline':
            raise TypeError, "Wrong type %s for polyline object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        self.points = []
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        self.elevation = obj.get_type(30)
        if self.elevation:
            self.elevation = self.elevation[0]
        else:
            self.elevation = 0
            
        self.flags = obj.get_type(70)
        if self.flags:
            self.flags = self.flags[0]
        else:
            self.flags = 0
        
        self.closed = self.flags&1 # byte coded, 1 = closed, 128 = plinegen
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.extrusion = self.get_extrusion(obj.data)
    
    
    
    
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, points - %s" %(self.__class__.__name__, self.layer, self.points)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import plines into Blender."""
        # Generate the geometery
        points = []
        for i in range(len(self.points)):
            point = self.points[i]
            if not point.bulge:
                points.append(point.loc)
            elif point.bulge and i < len(self.points)-1:# > 0:
                center, radius, start, end = solveBulge(point, self.points[i+1])
                #print center, radius, start, end
                verts, nosense = drawArc(center, radius, start, end)
                verts.pop(0) # remove first
                verts.pop() #remove last
                if point.bulge >= 0:
                    verts.reverse()
                points.extend(verts)
        edges = [[num, num+1] for num in range(len(points)-1)]
        if self.closed:
            edges.append([len(self.points)-1, 0])
    
        me = Mesh.New('pline')          # create a new mesh
        
        me.verts.extend(points)          # add vertices to mesh
        me.edges.extend(edges)           # add edges to the mesh
        
        # Now Create an object
        ob = Object.New('Mesh', 'pline')  # link mesh to an object
        ob.link(me)
        transform(self.extrusion, ob)
        ob.LocZ = self.elevation
        
        return ob
        
    


class Vertex(object):
    """Generic vertex object used by polylines (and maybe others)."""
    
    def __init__(self, obj=None):
        """Initializes vertex data.
        
            The optional obj arg is an entity object of type vertex.
        """
        self.loc = [0,0,0]
        self.bulge = 0
        self.swidth = 0
        self.ewidth = 0
        self.flags = 0
        
        if obj is not None:
            if not obj.type == 'vertex':
                raise TypeError, "Wrong type %s for vertex object!" %obj.type
            self.type = obj.type
            self.data = obj.data[:]
            
            self.get_props(obj.data)
    
    
    def get_props(self, data):
        """Gets coords for a vertex type object.
        
        Each vert can have a number of properties.
        Verts should be coded as 
        10:xvalue
        20:yvalue
        40:startwidth or 0
        41:endwidth or 0
        42:bulge or 0
        """
        for item in data:
            if item[0] == 10:   # 10 = x
                self.x = item[1]
            elif item[0] == 20: # 20 = y
                self.y = item[1]
            elif item[0] == 30: # 30 = z
                self.z = item[1]
            elif item[0] == 40: # 40 = start width
                self.swidth = item[1]
            elif item[0] == 41: # 41 = end width
                self.ewidth = item[1]
            elif item[0] == 42: # 42 = bulge
                self.bulge = item[1]
            elif item[0] == 70: # 70 = vert flags
                self.flags = item[1]
    
    
    def __len__(self):
        return 3
    
    
    def __getitem__(self, key):
        return self.loc[key]
    
    
    def __setitem__(self, key, value):
        if key in [0,1,2]:
            self.loc[key]
    
    
    def __iter__(self):
        return self.loc.__iter__()
    
    
    def __str__(self):
        return str(self.loc)
    
    
    def __repr__(self):
        return "Vertex %s, swidth=%s, ewidth=%s, bulge=%s" %(self.loc, self.swidth, self.ewidth, self.bulge)
    
    
    def getx(self):
        return self.loc[0]
    
    def setx(self, value):
        self.loc[0] = value
    
    x = property(getx, setx)
    
    
    def gety(self):
        return self.loc[1]
    
    def sety(self, value):
        self.loc[1] = value
    
    y = property(gety, sety)
    
    
    def getz(self):
        return self.loc[2]
    
    def setz(self, value):
        self.loc[2] = value
    
    z = property(getz, setz)
    


class Text:
    """Class for objects representing dxf Text."""
    
    def __init__(self, obj):
        """Expects an entity object of type text as input."""
        if not obj.type == 'text':
            raise TypeError, "Wrong type %s for text object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.height = obj.get_type(40)[0]
        self.value = obj.get_type(1)[0] # The text string value
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        self.rotation = obj.get_type(50) # radians?
        if not self.rotation:
            self.rotation = 0
        else:
            self.rotation = self.rotation[0]
        
        self.width_factor = obj.get_type(41) # Scaling factor along local x axis
        if not self.width_factor:
            self.width_factor = 1
        else:
            self.width_factor = self.width_factor[0]
        
        self.oblique = obj.get_type(51) # skew in degrees -90 <= oblique <= 90
        if not self.oblique:
            self.oblique = 0
        else:
            self.oblique = self.oblique[0]
        
        self.halignment = obj.get_type(72) # horiz. alignment
        if not self.halignment:  # 0=left, 1=center, 2=right, 3=aligned, 4=middle, 5=fit
            self.halignment = 0
        else:
            self.halignment = self.halignment[0]
            
        self.valignment = obj.get_type(73) # vert. alignment
        if not self.valignment:  # 0=baseline, 1=bottom, 2=middle, 3=top
            self.valignment = 0
        else:
            self.valignment = self.valignment[0]
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.loc = self.get_loc(obj.data, self.halignment, self.valignment)
        self.extrusion = self.get_extrusion(obj.data)
    
    
    
    
    def get_loc(self, data, halign, valign):
        """Gets adjusted location for text type objects.
        
        If group 72 and/or 73 values are nonzero then the first alignment point values
        are ignored and AutoCAD calculates new values based on the second alignment
        point and the length and height of the text string itself (after applying the
        text style). If the 72 and 73 values are zero or missing, then the second
        alignment point is meaningless.
        
        I don't know how to calc text size...
        """
        # bottom left x, y, z and justification x, y, z = 0
        x, y, z, jx, jy, jz = 0, 0, 0, 0, 0, 0
        for item in data:
            if item[0] == 10:   # 10 = x
                x = item[1]
            elif item[0] == 20: # 20 = y
                y = item[1]
            elif item[0] == 30: # 30 = z
                z = item[1]
            elif item[0] == 11: # 11 = x
                jx = item[1]
            elif item[0] == 21: # 21 = y
                jy = item[1]
            elif item[0] == 31: # 31 = z
                jz = item[1]
                
        if halign or valign:
            x, y, z = jx, jy, jz
        return [x, y, z]
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, value - %s" %(self.__class__.__name__, self.layer, self.value)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import texts into Blender."""
        # Generate the geometery
        txt = Text3d.New("text")
        txt.setSize(1)
        txt.setShear(self.oblique/90)
        txt.setExtrudeDepth(0.5)
        if self.halignment == 0:
            align = Text3d.LEFT
        elif self.halignment == 1:
            align = Text3d.MIDDLE
        elif self.halignment == 2:
            align = Text3d.RIGHT
        elif self.halignment == 3:
            align = Text3d.FLUSH
        else:
            align = Text3d.MIDDLE
        txt.setAlignment(align)
        txt.setText(self.value)
        
        # Now Create an object
        ob = Object.New('Text', 'text')  # link mesh to an object
        ob.link(txt)
        
        transform(self.extrusion, ob)
        
        # move the object center to the text location
        ob.loc = tuple(self.loc)
        # scale it to the text size
        ob.SizeX = self.height*self.width_factor
        ob.SizeY = self.height
        ob.SizeZ = self.height
        # and rotate it around z
        ob.RotZ = radians(self.rotation)
        
        return ob
          
    


class Mtext:
    """Class for objects representing dxf Mtext."""
    
    def __init__(self, obj):
        """Expects an entity object of type mtext as input."""
        if not obj.type == 'mtext':
            raise TypeError, "Wrong type %s for mtext object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.height = obj.get_type(40)[0]
        self.width = obj.get_type(41)[0]
        self.alignment = obj.get_type(71)[0] # alignment 1=TL, 2=TC, 3=TR, 4=ML, 5=MC, 6=MR, 7=BL, 8=BC, 9=BR
        self.value = self.get_text(obj.data) # The text string value
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        self.rotation = obj.get_type(50) # radians
        if not self.rotation:
            self.rotation = 0
        else:
            self.rotation = self.rotation[0]
        
        self.width_factor = obj.get_type(42) # Scaling factor along local x axis
        if not self.width_factor:
            self.width_factor = 1
        else:
            self.width_factor = self.width_factor[0]
        
        self.line_space = obj.get_type(44) # percentage of default
        if not self.line_space:
            self.line_space = 1
        else:
            self.line_space = self.line_space[0]
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.loc = self.get_loc(obj.data)
        self.extrusion = self.get_extrusion(obj.data)
    
    
    
    
    
    def get_text(self, data):
        """Reconstructs mtext data from dxf codes."""
        primary = ''
        secondary = []
        for item in data:
            if item[0] == 1: # There should be only one primary...
                primary = item[1]
            elif item[0] == 3: # There may be any number of extra strings (in order)
                secondary.append(item[1])
        if not primary:
            #raise ValueError, "Empty Mtext Object!"
            string = "Empty Mtext Object!"
        if not secondary:
            string = primary.replace(r'\P', '\n')
        else:
            string = ''.join(secondary)+primary
            string = string.replace(r'\P', '\n')
        return string    
    def get_loc(self, data):
        """Gets location for a mtext type objects.
        
        Mtext objects have only one point indicating location.
        """
        loc = [0,0,0]
        for item in data:
            if item[0] == 10:   # 10 = x
                loc[0] = item[1]
            elif item[0] == 20: # 20 = y
                loc[1] = item[1]
            elif item[0] == 30: # 30 = z
                loc[2] = item[1]
        return loc
    
    
    
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, value - %s" %(self.__class__.__name__, self.layer, self.value)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import mtexts into Blender."""
        # Generate the geometery
        txt = Text3d.New("mtext")
        txt.setSize(1)
        # Blender doesn't give access to its text object width currently
        # only to the text3d's curve width...
        #txt.setWidth(text.width/10)
        txt.setLineSeparation(self.line_space)
        txt.setExtrudeDepth(0.5)
        txt.setText(self.value)
        
        # Now Create an object
        ob = Object.New('Text', 'mtext')  # link mesh to an object
        ob.link(txt)
        
        transform(self.extrusion, ob)
        
        # move the object center to the text location
        ob.loc = tuple(self.loc)
        # scale it to the text size
        ob.SizeX = self.height*self.width_factor
        ob.SizeY = self.height
        ob.SizeZ = self.height
        # and rotate it around z
        ob.RotZ = radians(self.rotation)
        
        return ob
        
    
    
    


class Circle:
    """Class for objects representing dxf Circles."""
    
    def __init__(self, obj):
        """Expects an entity object of type circle as input."""
        if not obj.type == 'circle':
            raise TypeError, "Wrong type %s for circle object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.radius = obj.get_type(40)[0]
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.loc = self.get_loc(obj.data)
        self.extrusion = self.get_extrusion(obj.data)
    
    
    
    
    
    def get_loc(self, data):
        """Gets the center location for circle type objects.
        
        Circles have a single coord location.
        """
        loc = [0, 0, 0]
        for item in data:
            if item[0] == 10:   # 10 = x
                loc[0] = item[1]
            elif item[0] == 20: # 20 = y
                loc[1] = item[1]
            elif item[0] == 30: # 30 = z
                loc[2] = item[1]
        return loc
    
    
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, radius - %s" %(self.__class__.__name__, self.layer, self.radius)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import circles into Blender."""
        # Generate the geometery
        # Now Create an object
        if curves:
            ob = drawCurveCircle(self)
        else:
            center = self.loc
            radius = self.radius
            
            circ = 2 * pi * radius
            if circ < 65: # if circumfrance is too small
                verts = 32 # set a fixed number of 32 verts
            else:
                verts = circ/.5 # figure out how many verts we need
                if verts > 100: # Blender only accepts values
                    verts = 100 # [3:100]
                
            c = Mesh.Primitives.Circle(int(verts), radius*2)
        
            ob = Object.New('Mesh', 'circle')
            ob.link(c)                  # link curve data with this object
            
        ob.loc = tuple(center)
        transform(self.extrusion, ob)
            
        return ob
        
    


class Arc:
    """Class for objects representing dxf arcs."""
    
    def __init__(self, obj):
        """Expects an entity object of type arc as input."""
        if not obj.type == 'arc':
            raise TypeError, "Wrong type %s for arc object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.radius = obj.get_type(40)[0]
        self.start_angle = obj.get_type(50)[0]
        self.end_angle = obj.get_type(51)[0]
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.loc = self.get_loc(obj.data)
        self.extrusion = self.get_extrusion(obj.data)
    
    
    
    
    
    def get_loc(self, data):
        """Gets the center location for arc type objects.
        
        Arcs have a single coord location.
        """
        loc = [0, 0, 0]
        for item in data:
            if item[0] == 10:   # 10 = x
                loc[0] = item[1]
            elif item[0] == 20: # 20 = y
                loc[1] = item[1]
            elif item[0] == 30: # 30 = z
                loc[2] = item[1]
        return loc
    
    
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, radius - %s" %(self.__class__.__name__, self.layer, self.radius)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import arcs into Blender."""
        # Generate the geometery
        # Now Create an object
        if curves:
            ob = drawCurveArc(self)
        else:
            center = self.loc
            radius = self.radius
            start = self.start_angle
            end = self.end_angle
            verts, edges = drawArc(None, radius, start, end)
            
            a = Mesh.New('arc')
            
            a.verts.extend(verts)          # add vertices to mesh
            a.edges.extend(edges)           # add edges to the mesh
            
            ob = Object.New('Mesh', 'arc')
            ob.link(a)                  # link curve data with this object
            ob.loc = tuple(center)
            ob.RotX = radians(180)
        
        transform(self.extrusion, ob)
        ob.size = (1,1,1)
        
        return ob
          

class BlockRecord:
    """Class for objects representing dxf block_records."""
    
    def __init__(self, obj):
        """Expects an entity object of type block_record as input."""
        if not obj.type == 'block_record':
            raise TypeError, "Wrong type %s for block_record object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.name = obj.get_type(2)[0]
        
        # optional data (with defaults)
        self.insertion_units = obj.get_type(70)
        if not self.insertion_units:
            self.insertion_units = None
        else:
            self.insertion_units = self.insertion_units[0]
            
        self.insert_units = obj.get_type(1070)
        if not self.insert_units:
            self.insert_units = None
        else:
            self.insert_units = self.insert_units[0]
        
    
    
    
    
    
    def __repr__(self):
        return "%s: name - %s, insert units - %s" %(self.__class__.__name__, self.name, self.insertion_units)
    



class Block:
    """Class for objects representing dxf blocks."""
    
    def __init__(self, obj):
        """Expects an entity object of type block as input."""
        if not obj.type == 'block':
            raise TypeError, "Wrong type %s for block object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        self.name = obj.name
        
        # required data
        self.flags = obj.get_type(70)[0]
        self.entities = dxfObject('block_contents')
        self.entities.data = objectify([ent for ent in obj.data if type(ent) != list])
        
        # optional data (with defaults)
        self.path = obj.get_type(1)
        if self.path:
            self.path = self.path[0]
        else:
            self.path = ''
            
        self.discription = obj.get_type(4)
        if self.discription:
            self.discription = self.discription[0]
        else:
            self.discription = ''
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.loc = self.get_loc(obj.data)
    
    
    
    
    def get_loc(self, data):
        """Gets the insert point of the block."""
        loc = [0, 0, 0]
        for item in data:
            if type(item) != list:
                continue
            if item[0] == 10:   # 10 = x
                loc[0] = item[1]
            elif item[0] == 20: # 20 = y
                loc[1] = item[1]
            elif item[0] == 30: # 30 = z
                loc[2] = item[1]
        return loc
    
    
    
    def __repr__(self):
        return "%s: name - %s, description - %s, xref-path - %s" %(self.__class__.__name__, self.name, self.discription, self.path)
    



class Insert:
    """Class for objects representing dxf inserts."""
    
    def __init__(self, obj):
        """Expects an entity object of type insert as input."""
        if not obj.type == 'insert':
            raise TypeError, "Wrong type %s for insert object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.block = obj.get_type(2)[0]
        
        # optional data (with defaults)
        self.rotation = obj.get_type(50)
        if self.rotation:
            self.rotation = self.rotation[0]
        else:
            self.rotation = 0
        
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.loc = self.get_loc(obj.data)
        self.scale = self.get_scale(obj.data)
        self.rows, self.columns = self.get_array(obj.data)
        self.extrusion = self.get_extrusion(obj.data)
    
    
    
    
    
    def get_loc(self, data):
        """Gets the center location for circle type objects.
        
        Circles have a single coord location.
        """
        loc = [0, 0, 0]
        for item in data:
            if item[0] == 10:   # 10 = x
                loc[0] = item[1]
            elif item[0] == 20: # 20 = y
                loc[1] = item[1]
            elif item[0] == 30: # 30 = z
                loc[2] = item[1]
        return loc
    
    
    
    def get_scale(self, data):
        """Gets the x/y/z scale factor for the block.
        """
        scale = [1, 1, 1]
        for item in data:
            if item[0] == 41:   # 41 = x scale
                scale[0] = item[1]
            elif item[0] == 42: # 42 = y scale
                scale[1] = item[1]
            elif item[0] == 43: # 43 = z scale
                scale[2] = item[1]
        return scale
    
    
    
    def get_array(self, data):
        """Returns the pair (row number, row spacing), (column number, column spacing)."""
        columns = 1
        rows = 1
        cspace = 0
        rspace = 0
        for item in data:
            if item[0] == 70:   # 70 = columns
                columns = item[1]
            elif item[0] == 71: # 71 = rows
                rows = item[1]
            if item[0] == 44:   # 44 = columns
                cspace = item[1]
            elif item[0] == 45: # 45 = rows
                rspace = item[1]
        return (rows, rspace), (columns, cspace)
    
    
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, block - %s" %(self.__class__.__name__, self.layer, self.block)
    
    
    def draw(self, handle, settings):
        """Do all the specific things needed to import blocks into Blender.
        
        Blocks are made of three objects:
            the block_record in the tables section
            the block in the blocks section
            the insert object in the entities section
        
        block_records give the insert units, blocks provide the objects drawn in the
        block, and the insert object gives the location/scale/rotation of the block 
        instances.  To draw a block you must first get a group with all the
        blocks entities drawn in it, then scale the entities to match the world
        units, then dupligroup that data to an object matching each insert object."""
        
        # Create an object
        ob = Object.New('Mesh', self.block)
        ob.link(handle) # Give the object a handle
        
        if settings.drawTypes['blocks']:
            # get our block group
            block = settings.blocks(self.block)
       
            ob.DupGroup = block
            ob.enableDupGroup = True
            
        ob.loc = tuple(self.loc)
        transform(self.extrusion, ob)
        ob.RotZ += radians(self.rotation)
        ob.size = tuple(self.scale)
                
        return ob
        



class Ellipse:
    """Class for objects representing dxf ellipses."""
    
    def __init__(self, obj):
        """Expects an entity object of type ellipse as input."""
        if not obj.type == 'ellipse':
            raise TypeError, "Wrong type %s for ellipse object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # required data
        self.ratio = obj.get_type(40)[0]
        self.start_angle = obj.get_type(41)[0]
        self.end_angle = obj.get_type(42)[0]
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
            
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
            
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.loc = self.get_loc(obj.data)
        self.major = self.get_major(obj.data)
        self.extrusion = self.get_extrusion(obj.data)
        self.radius = sqrt(self.major[0]**2 + self.major[0]**2 + self.major[0]**2)
    
    
    
    
    def get_loc(self, data):
        """Gets the center location for arc type objects.
        
        Arcs have a single coord location.
        """
        loc = [0, 0, 0]
        for item in data:
            if item[0] == 10:   # 10 = x
                loc[0] = item[1]
            elif item[0] == 20: # 20 = y
                loc[1] = item[1]
            elif item[0] == 30: # 30 = z
                loc[2] = item[1]
        return loc
    
    
    
    def get_major(self, data):
        """Gets the major axis for ellipse type objects.
        
        The ellipse major axis defines the rotation of the ellipse and its radius.
        """
        loc = [0, 0, 0]
        for item in data:
            if item[0] == 11:   # 11 = x
                loc[0] = item[1]
            elif item[0] == 21: # 21 = y
                loc[1] = item[1]
            elif item[0] == 31: # 31 = z
                loc[2] = item[1]
        return loc
    
    
    
    def get_extrusion(self, data):
        """Find the axis of extrusion.
        
        Used to get the objects Object Coordinate System (ocs).
        """
        vec = [0,0,1]
        for item in data:
            if item[0] == 210:   # 210 = x
                vec[0] = item[1]
            elif item[0] == 220: # 220 = y
                vec[1] = item[1]
            elif item[0] == 230: # 230 = z
                vec[2] = item[1]
        return vec
    
    
    def __repr__(self):
        return "%s: layer - %s, radius - %s" %(self.__class__.__name__, self.layer, self.radius)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import ellipses into Blender."""
        # Generate the geometery
        # Now Create an object
        if curves:
            ob = drawCurveArc(self)
        else:
            major = Mathutils.Vector(self.major)
            delta = Mathutils.AngleBetweenVecs(major, WORLDX)
            center = self.loc
            radius = major.length
            start = degrees(self.start_angle)
            end = degrees(self.end_angle)
            verts, edges = drawArc(None, radius, start, end)
            
            e = Mesh.New('ellipse')
            
            e.verts.extend(verts)          # add vertices to mesh
            e.edges.extend(edges)           # add edges to the mesh
            
        
            ob = Object.New('Mesh', 'arc')
            ob.link(e)                  # link curve data with this object
            ob.loc = tuple(center)
            ob.SizeY = self.ratio
            #ob.RotZ = radians(delta)
            ob.RotX = radians(180)
    
        
        transform(self.extrusion, ob)
        ob.RotZ = radians(delta)
            
        return ob
        


class Face:
    """Class for objects representing dxf 3d faces."""
    
    def __init__(self, obj):
        """Expects an entity object of type 3dfaceplot as input."""
        if not obj.type == '3dface':
            raise TypeError, "Wrong type %s for 3dface object!" %obj.type
        self.type = obj.type
        self.data = obj.data[:]
        
        # optional data (with defaults)
        self.space = obj.get_type(67)
        if self.space:
            self.space = self.space[0]
        else:
            self.space = 0
        
        self.color_index = obj.get_type(62)
        if self.color_index:
            self.color_index = self.color_index[0]
        else:
            self.color_index = BYLAYER
        
        discard, self.layer = get_layer(obj.data)
        obj.data.remove(discard)
        self.points = self.get_points(obj.data)
    
    
    
    
    def get_points(self, data):
        """Gets 3-4 points for a 3d face type object.
        
        Faces have three or optionally four verts.
        """
        
        a = [0, 0, 0]
        b = [0, 0, 0]
        c = [0, 0, 0]
        d = False
        for item in data:
            # ----------- a -------------
            if item[0] == 10:   # 10 = x
                a[0] = item[1]
            elif item[0] == 20: # 20 = y
                a[1] = item[1]
            elif item[0] == 30: # 30 = z
                a[2] = item[1]
            # ----------- b -------------
            elif item[0] == 11: # 11 = x
                b[0] = item[1]
            elif item[0] == 21: # 21 = y
                b[1] = item[1]
            elif item[0] == 31: # 31 = z
                b[2] = item[1]
            # ----------- c -------------
            elif item[0] == 12: # 12 = x
                c[0] = item[1]
            elif item[0] == 22: # 22 = y
                c[1] = item[1]
            elif item[0] == 32: # 32 = z
                c[2] = item[1]
            # ----------- d -------------
            elif item[0] == 13: # 13 = x
                d = [0, 0, 0]
                d[0] = item[1]
            elif item[0] == 23: # 23 = y
                d[1] = item[1]
            elif item[0] == 33: # 33 = z
                d[2] = item[1]
        out = [a,b,c]
        if d:
            out.append(d)
        return out
    
    
    def __repr__(self):
        return "%s: layer - %s, points - %s" %(self.__class__.__name__, self.layer, self.points)
    
    
    def draw(self, curves=False):
        """Do all the specific things needed to import 3d faces into Blender."""
        # Generate the geometery
        points = self.points
        if len(self.points) > 3:
            faces = [[0, 1, 2, 3]]
        else:
            faces = [[0, 1, 2]]
        
        me = Mesh.New('3dface')          # create a new mesh
        
        me.verts.extend(points)          # add vertices to mesh
        me.faces.extend(faces)           # add faces to the mesh
        
        # Now Create an object
        ob = Object.New('Mesh', '3dface')  # link mesh to an object
        ob.link(me)
        
        return ob
        


# type to object map
type_map = {
    'line':Line,
    'lwpolyline':LWpolyline,
    'text':Text,
    'mtext':Mtext,
    'circle':Circle,
    'arc':Arc,
    'layer':Layer,
    'block_record':BlockRecord,
    'block':Block,
    'insert':Insert,
    'ellipse':Ellipse,
    '3dface':Face
}

def objectify(data):
    """Expects a section type object's data as input.
    
    Maps object data to the correct object type.
    """
    objects = [] # colector for finished objects
    known_types = type_map.keys() # so we don't have to call foo.keys() every iteration
    index = 0
    while index < len(data):
        item = data[index]
        if type(item) != list and item.type in known_types:
            # proccess the object and append the resulting object
            objects.append(type_map[item.type](item))
        elif type(item) != list and item.type == 'table':
            item.data = objectify(item.data) # tables have sub-objects
            objects.append(item)
        elif type(item) != list and item.type == 'polyline':
            pline = Polyline(item)
            while 1:
                index += 1
                item = data[index]
                if item.type == 'vertex':
                    v = Vertex(item)
                    pline.points.append(v)
                elif item.type == 'seqend':
                    break
                else:
                    print "Error: non-vertex found before seqend!"
                    index -= 1
                    break
            objects.append(pline)
        else:
            # we will just let the data pass un-harrased
            objects.append(item)
        index += 1
    return objects

class MatColors:
    """A smart container for color based materials.
    
    This class is a wrapper around a dictionary mapping color indicies to materials.
    When called with a color index it returns a material corrisponding to that index.
    Behind the scenes it checks if that index is in its keys, and if not it creates
    a new material.  It then adds the new index:material pair to its dict and returns
    the material.
    """
    
    def __init__(self, map):
        """Expects a dictionary mapping layer names to color idices."""
        self.map = map
        self.colors = {}
    
    
    def __call__(self, color=None):
        """Return the material associated with color.
        
        If a layer name is provided the color of that layer is used.
        """
        if not color:
            color = 0
        if type(color) == str: # Layer name
            try:
                color = self.map[color].color # color = layer_map[name].color
            except KeyError:
                layer = Layer(name=color, color=0, frozen=False)
                self.map[color] = layer
                color = 0
        color = abs(color)
        if color not in self.colors.keys():
            self.add(color)
        return self.colors[color]
    
    
            
    
    def add(self, color):
        """Create a new material using the provided color index."""
        global color_map
        mat = Material.New('ColorIndex-%s' %color)
        mat.setRGBCol(color_map[color])
        mat.setMode("Shadeless", "Wire")
        self.colors[color] = mat
    



class Blocks:
    """A smart container for blocks.
    
    This class is a wrapper around a dictionary mapping block names to Blender data blocks.
    When called with a name string it returns a block corrisponding to that name.
    Behind the scenes it checks if that name is in its keys, and if not it creates
    a new data block.  It then adds the new name:block pair to its dict and returns
    the block.
    """
    
    def __init__(self, map, settings):
        """Expects a dictionary mapping block names to block objects."""
        self.map = map
        self.settings = settings
        self.blocks = {}
    
    
    def __call__(self, name=None):
        """Return the data block associated with name.
        
        If no name is provided return self.blocks.
        """
        if not name:
            return self.blocks
        if name not in self.blocks.keys():
            self.add(name)
        return self.blocks[name]
    
    
                
    def add(self, name):
        """Create a new block group for the block with name."""
        write = self.settings.write
        group = Group.New(name)
        block = self.map[name]
        write("\nDrawing %s block entities..." %name)
        drawEntities(block.entities, self.settings, group)
        write("Done!")
        self.blocks[name] = group
    
    



class Settings:
    """A container for all the import settings and objects used by the draw functions.
    
    This is like a collection of globally accessable persistant properties and functions.
    """
    # Optimization constants
    MIN = 0
    MID = 1
    PRO = 2
    MAX = 3
    
    def __init__(self, drawing, curves, optimization, **kwds):
        """Given the drawing initialize all the important settings used by the draw functions."""
        self.curves = curves
        self.optimization = optimization
        print "Setting optimization level %s!" %optimization
        self.drawTypes = kwds
        self.layers = True
        self.blocks = True
        
        # First sort out all the sections
        sections = dict([(item.name, item) for item in drawing.data])
        
        # The header section may be omited
        if 'header' in sections.keys():
            self.write("Found header!")
        else:
            self.write("File contains no header!")
                
        # The tables section may be partialy or completely missing.
        if 'tables' in sections.keys():
            self.write("Found tables!")
            tables = dict([(item.name, item) for item in sections["tables"].data])
            if 'layer' in tables.keys():
                self.write("Found layers!")
                # Read the layers table and get the layer colors
                self.colors = getLayers(drawing)
            else:
                self.write("File contains no layers table!")
                self.layers = False
                self.colors = MatColors({})
        else:
            self.write("File contains no tables!")
            self.write("File contains no layers table!")
            self.layers = False
            self.colors = MatColors({})
            
        # The blocks section may be omited
        if 'blocks' in sections.keys():
            self.write("Found blocks!")
            # Read the block definitions and build our block object
            if self.drawTypes['blocks']:
                self.blocks = getBlocks(drawing, self)
        else:
            self.write("File contains no blocks!")
            self.drawTypes['blocks'] = False    
    def write(self, text, newline=True):
        """Wraps the built-in print command in a optimization check."""
        if self.optimization <= self.MID:
            if newline:
                print text
            else:
                print text,
            
    def redraw(self):
        """Update Blender if optimization level is low enough."""
        if self.optimization <= self.MIN:
            Blender.Redraw()
    
    
    def progress(self, done, text):
        """Wrapper for Blender.Window.DrawProgressBar."""
        if self.optimization <= self.PRO:
            Window.DrawProgressBar(done, text)
        
    
    def isOff(self, name):
        """Given a layer name look up the layer object and return its visable status."""
        # colors are negative if layer is off
        try:
            layer = self.colors.map[name]
        except KeyError:
            return False
            
        if layer.frozen or layer.color < 0:
            return True
        else:
            return False
        
    
    

def main(filename=None):
    editmode = Window.EditMode()    # are we in edit mode?  If so ...
    if editmode: Window.EditMode(0) # leave edit mode before
    Window.WaitCursor(True)         # Let the user know we are thinking
    
    try:
        if not filename:
            print "DXF import: error, no file selected.  Attempting to load default file."
            try:
                filename = Sys.expandpath(r".\examples\big-test.dxf")
            except IOError:
                print "DXF import: error finding default test file, exiting..."
                return None
        drawing = readDXF(filename, objectify)
        drawDrawing(drawing)
    finally:
        # restore state even if things didn't work
        Window.WaitCursor(False)
        if editmode: Window.EditMode(1) # and put things back how we fond them
    
def getOCS(az):
    """An implimentation of the Arbitrary Axis Algorithm."""
    # world x, y, and z axis
    wx = WORLDX
    wy = Mathutils.Vector((0,1,0))
    wz = Mathutils.Vector((0,0,1))
    
    #decide if we need to transform our coords
    if az[0] == 0 and az[1] == 0:
        return False
    # elif abs(az[0]) < 0.0001 or abs(az[1]) < 0.0001:
        # return False
    az = Mathutils.Vector(az)
        
    cap = 0.015625 # square polar cap value (1/64.0)
    if abs(az.x) < cap and abs(az.y) < cap:
        ax = Mathutils.CrossVecs(wy, az)
    else:
        ax = Mathutils.CrossVecs(wz, az)
    ax = ax.normalize()
    ay = Mathutils.CrossVecs(az, ax)
    ay = ay.normalize()
    return ax, ay, az
    
def transform(normal, obj):
    """Use the calculated ocs to determine the objects location/orientation in space.
    
    Quote from dxf docs:
        The elevation value stored with an entity and output in DXF files is a sum
    of the Z-coordinate difference between the UCS XY plane and the OCS XY
    plane, and the elevation value that the user specified at the time the entity
    was drawn.
    """
    ocs = getOCS(normal)
    if ocs:
        #print ocs
        x, y, z = ocs
        x = x.resize4D()
        y = y.resize4D()
        z = -z.resize4D()
        x.w = 0
        y.w = 0
        z.w = 0
        o = Mathutils.Vector(obj.loc)
        o = o.resize4D()
        mat = Mathutils.Matrix(x, y, z, o)
        obj.setMatrix(mat)
    
def getLayers(drawing):
    """Build a dictionary of name:color pairs for the given drawing."""
    tables = drawing.tables
    for table in tables.data:
        if table.name == 'layer':
            layers = table
            break
    map = {}
    for item in layers.data:
        if type(item) != list and item.type == 'layer':
            map[item.name] = item
    colors = MatColors(map)
    return colors
def getBlocks(drawing, settings):
    """Build a dictionary of name:block pairs for the given drawing."""
    map = {}
    for item in drawing.blocks.data:
        if type(item) != list and item.type == 'block':
            try:
                map[item.name] = item
            except KeyError:
                # annon block
                print "Cannot map %s - %s!" %(item.name, item)
    blocks = Blocks(map, settings)
    return blocks
def drawDrawing(drawing):
    """Given a drawing object recreate the drawing in Blender."""
    print "Getting settings..."
    Window.WaitCursor(False)
    #width, height = Window.GetScreenSize()
    Window.SetMouseCoords()
    
    # Create a PupBlock to get user preferences
    lines = Draw.Create(1)
    arcs = Draw.Create(1)
    circles = Draw.Create(1)
    polylines = Draw.Create(1)
    text = Draw.Create(1)
    blocks = Draw.Create(1)
    faces = Draw.Create(1)
    optim = Draw.Create(1)
    
    block = []
    block.append("Draw Options:")
    block.append(("Lines", lines, "Toggle drawing of lines"))
    block.append(("Arcs", arcs, "Toggle drawing of arcs"))
    block.append(("Circles", circles, "Toggle drawing of circles"))
    block.append(("Polylines", polylines, "Toggle drawing of polylines"))
    block.append(("Text", text, "Toggle drawing of text"))
    block.append(("Blocks", blocks, "Toggle drawing of blocks"))
    block.append(("Faces", faces, "Toggle drawing of faces"))
    block.append("Update Optimization:")
    block.append(("Level: ", optim, 0, 3))
    
    retval = Draw.PupBlock("DXF Import", block)
    
    Window.WaitCursor(True)         # Let the user know we are thinking
    # The settings object controls how dxf entities are drawn
    settings = Settings(drawing, curves=False, 
                        optimization=int(optim.val),
                        lines=bool(lines.val),
                        arcs=bool(arcs.val),
                        circles=bool(circles.val),
                        polylines=bool(polylines.val),
                        text=bool(text.val),
                        blocks=bool(blocks.val),
                        faces=bool(faces.val)
                        )
    
    settings.write("Drawings entities...")
    # Draw all the know entity types in the current scene
    drawEntities(drawing.entities, settings)
    
    # Set the visable layers
    SCENE.setLayers([i+1 for i in range(18)])
    Blender.Redraw(-1)
    settings.write("Done!")


def drawEntities(entities, settings, group=None):
    """Draw every kind of thing in the entity list.
    
    If provided 'group' is the Blender group new entities are to be added to.
    """
    for _type in type_map.keys():
        # for each known type get a list of that type and call the associated draw function
        drawer(_type, entities.get_type(_type), settings, group)
    

def drawer(_type, entities, settings, group):
    """Call with a list of entities and a settings object to generate Blender geometry."""
    if entities:
        # Break out early if settings says we aren't drawing the current type
        block = False
        skip = False
        if _type == 'block_record':
            skip = True
        if _type == 'line' and not settings.drawTypes['lines']:
            skip = True
        elif _type == 'arc' and not settings.drawTypes['arcs']:
            skip = True
        elif _type == 'circle' and not settings.drawTypes['circles']:
            skip = True
        elif _type in ['lwpolyline', 'polyline'] and not settings.drawTypes['polylines']:
            skip = True
        elif _type in ['text', 'mtext'] and not settings.drawTypes['text']:
            skip = True
        elif _type == 'insert':
            if not settings.drawTypes['blocks']:
                skip = True
            block = True
        elif _type == '3dface' and not settings.drawTypes['faces']:
            skip = True
        if skip:
            settings.write("Skipping %s type entities!" %_type)
            return
        
        message = "Drawing %ss..." %_type
        settings.write(message, False)
        settings.progress(0, message)
            
        if block:
            # create one 'handle' data block to use with all blocks
            handle = Mesh.New('insert')
            handle.verts.extend(
                [(-0.01,0,0),
                (0.01,0,0),
                (0,-0.01,0),
                (0,0.01,0),
                (0,0,-0.01),
                (0,0,0.01)]
            )
            handle.edges.extend([(0,1),(2,3),(4,5)])
            
        # For now we only want model-space objects
        entities = [entity for entity in entities if entity.space == 0]
        
        if group:
            block_def = True
        else:
            block_def = False
        
        tot = len(entities)
        cur = 1.0
        for entity in entities:
            settings.write('\b.', False)
            settings.progress(cur/tot, message)
            cur += 1
            
            # First get the layer group
            if not block_def:
                group = getGroup('layer %s' %entity.layer) # add overhead just to make things a little cleaner
            
            if block:
                ob = entity.draw(handle, settings)
            else:
                ob = entity.draw(settings.curves)
            
            setColor(entity, ob, settings)
            # Link it to the scene and add it to the correct group
            SCENE.link(ob)
            setGroup(group, ob)
            
            # Set the visability
            if settings.isOff(entity.layer):
                ob.layers = [20]
            elif block_def:
                ob.layers = [19]
            else:
                ob.layers = [i+1 for i in range(20)]
            
            # # Set the visability
            # if settings.isOff(entity.layer) or block_def:
                # ob.restrictDisplay = True
                # ob.restrictRender = True
            
            settings.redraw()
        message = "\nFinished drawing %ss!" %entities[0].type
        settings.write(message)
        settings.progress(1, message)
        
    
def getGroup(name):
    """Returns a Blender group object."""
    try:
        group = Group.Get(name)
    except: # What is the exception?
        group = Group.New(name)
    return group
def setColor(entity, ob, settings):
    # Set the color
    if entity.color_index == BYLAYER:
        mat = settings.colors(entity.layer)
    else:
        mat = settings.colors(entity.color_index)
    try:
        ob.setMaterials([mat])
    except ValueError:
        settings.write("material error - %s!" %mat)
    ob.colbits = 0x01 # Set OB materials.
def setGroup(group, it):
    try:
        group.objects.link(it)
    except:
        group.objects.append(it)

def solveBulge(p1, p2):
    """return the center, radius, start angle, and end angle given two points.
    
    Needs to take into account bulge sign.
    negative = clockwise
    positive = counter-clockwise
    
    to find center given two points, and arc angle
    calculate radius
        Cord = sqrt(start^2 + end^2)
        S = (bulge*Cord)/2
        radius = ((Cord/2)^2+S^2)/2*S
    angle of arc = 4*atan( bulge )
    angle from p1 to center is (180-angle)/2
    get vector pointing from p1 to p2 (p2 - p1)
    normalize it and multiply by radius
    rotate around p1 by angle to center point to center.
    
    start angle = angle between (center - p1) and worldX
    end angle = start angle + angle of arc
    """
    bulge = p1.bulge
    p2 = Mathutils.Vector(p2.loc)
    p1 = Mathutils.Vector(p1.loc)
    cord = p2 - p1 # vector from p1 to p2
    clength = cord.length
    s = (bulge * clength)/2 # sagitta (height)
    radius = abs(((clength/2)**2 + s**2)/(2*s)) # magic formula
    angle = abs(degrees(4*atan(bulge))) # theta (included angle)
    delta = (180 - angle)/2 # the angle from cord to center
    if bulge > 0:
        delta = -delta
    radial = cord.normalize() * radius # a radius length vector aligned with cord
    rmat = Mathutils.RotationMatrix(delta, 3, 'Z')
    center = p1 + (rmat * radial) # rotate radial by delta degrees, then add to p1 to find center
    if bulge < 0:
        sv = (p1 - center) # start from point 2
    else:
        sv = (p2 - center) # start from point 1
    start = Mathutils.AngleBetweenVecs(sv, WORLDX) # start angle is the angle between the first leg of the section and the x axis
    # The next bit is my cludge to figure out if start should be negative
    rmat = Mathutils.RotationMatrix(start, 3, 'Z')
    rstart = rmat * sv
    if Mathutils.AngleBetweenVecs(rstart, WORLDX) < start:
        start = -start
    # the end angle is just 'angle' more than start angle
    end = start + angle
    return list(center), radius, start, end
def drawArc(center, radius, start, end, step=0.5):
    """Draw a mesh arc with the given parameters."""
    # center is currently set by object
    
    # if start > end:
        # start = start - 360
    if end > 360:
        end = end%360
    startmatrix = Mathutils.RotationMatrix(start, 3, "Z")
    startpoint = startmatrix * Mathutils.Vector((radius, 0, 0))
    endmatrix = Mathutils.RotationMatrix(end, 3, "Z")
    endpoint = endmatrix * Mathutils.Vector((radius, 0, 0))
    points = [startpoint]
    
    if end < start:
        end +=360
    
    delta = end - start
    length = radians(delta) * radius
    if radius < step*10: # if circumfrance is too small
        pieces = int(delta/10) # set a fixed step of 10 degrees
    else:
        pieces = int(length/step) # figure out how many pieces we need for our arc
    if pieces == 0: # stupid way to avoid a div by zero error
        pieces = 1  # what would be a smarter way to fix this?
    step = delta/pieces # set step so pieces * step = degrees in arc
    
    stepmatrix = Mathutils.RotationMatrix(step, 3, "Z")
    point = Mathutils.Vector(startpoint)
    for i in range(int(pieces)):
        point = stepmatrix * point
        points.append(point)
    points.append(endpoint)
    
    if center:
        points = [[point[0]+center[0], point[1]+center[1], point[2]+center[2]] for point in points]
    edges = [[num, num+1] for num in range(len(points)-1)]
    
    return points, edges
# Here are some alternate drawing functions for creating curve geometery.

def drawCurveCircle(circle):
    """Given a dxf circle object return a blender circle object using curves."""
    c = Curve.New('circle')             # create new  curve data
    
    center = circle.loc
    radius = circle.radius
    
    p1 = (0, -radius, 0)
    p2 = (radius, 0, 0)
    p3 = (0, radius, 0)
    p4 = (-radius, 0, 0)
    
    p1 = BezTriple.New(p1)
    p2 = BezTriple.New(p2)
    p3 = BezTriple.New(p3)
    p4 = BezTriple.New(p4)
    
    curve = c.appendNurb(p1)
    curve.append(p2)
    curve.append(p3)
    curve.append(p4)
    for point in curve:
        point.handleTypes = [AUTO, AUTO]
    curve.flagU = 1 # Set curve cyclic
    c.update()
    
    ob = Object.New('Curve', 'circle')    # make curve object
    return ob
    
def drawCurveArc(arc):
    """Given a dxf circle object return a blender circle object using curves."""
    if start > end:
        start = start - 360
    startmatrix = Mathutils.RotationMatrix(start, 3, "Z")
    startpoint = startmatrix * Mathutils.Vector((radius, 0, 0))
    endmatrix = Mathutils.RotationMatrix(end, 3, "Z")
    endpoint = endmatrix * Mathutils.Vector((radius, 0, 0))
    # Note: handles must be tangent to arc and of correct length...

    a = Curve.New('arc')             # create new  curve data
    
    center = circle.loc
    radius = circle.radius
    
    p1 = (0, -radius, 0)
    p2 = (radius, 0, 0)
    p3 = (0, radius, 0)
    p4 = (-radius, 0, 0)
    
    p1 = BezTriple.New(p1)
    p2 = BezTriple.New(p2)
    p3 = BezTriple.New(p3)
    p4 = BezTriple.New(p4)
    
    curve = a.appendNurb(p1)
    curve.append(p2)
    curve.append(p3)
    curve.append(p4)
    for point in curve:
        point.handleTypes = [AUTO, AUTO]
    curve.flagU = 1 # Set curve cyclic
    a.update()
    
    ob = Object.New('Curve', 'arc')    # make curve object
    return ob


if __name__ == "__main__":
    Window.FileSelector(main, 'Import a DXF file', '*.dxf')