io_import_scene_dxf.py

# ##### 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####

bl_info = {
    'name': 'Import Autocad DXF (.dxf)',
    'author': 'Thomas Larsson, Remigiusz Fiedler',
    'version': (0, 1, 5),
    'blender': (2, 5, 6),
    'api': 34600,
    'location': 'File > Import',
    'description': 'Import files in the Autocad DXF format (.dxf)',
    'warning': 'only a part of DXF specification is supported, WIP',
    'wiki_url': 'http://wiki.blender.org/index.php/Extensions:2.5/Py/'\
        'Scripts/Import-Export/DXF_Importer',
    'tracker_url': 'https://projects.blender.org/tracker/index.php?'\
        'func=detail&aid=23480',
    'support': 'OFFICIAL',
    'category': 'Import-Export',
    }

"""
Release note by migius (DXF support maintainer) 2011.01.02:
Script supports only a small part of DXF specification:
- imports LINE, ARC, CIRCLE, ELLIPSE, SOLID, TRACE, POLYLINE, LWPOLYLINE
- imports TEXT, MTEXT
- supports 3d-rotation of entities (210 group)
- supports THICKNESS for SOLID, TRACE, LINE, ARC, CIRCLE, ELLIPSE
- ignores WIDTH, THICKNESS, BULGE in POLYLINE/LWPOLYLINE
- ignores face-data in POLYFACE / POLYMESH
- ignores TEXT 2d-rotation
- ignores hierarchies (BLOCK, INSERT, GROUP)
- ignores LAYER
- ignores COLOR, LINEWIDTH, LINESTYLE

This script is a temporary solution.
Probably no more improvements will be done to this script.
The full-feature importer script from 2.49 will be back in 2.6 release.

Installation:
Place this file to Blender addons directory
  (on Windows it is %Blender_directory%\2.53\scripts\addons\)
You must activate the script in the "Add-Ons" tab (user preferences).
Access it from File > Import menu.

History:
ver 0.1.5 - 2011.02.05 by migius for r.34661
- changed support level to OFFICIAL
- fixed missing last point at building Mesh-ARCs (by pildanovak)
- fixed for changes in API and mathutils by campbell
ver 0.1.4 - 2011.01.13 by migius
- modified for latest API in rev.34300 (by Filiciss Muhgue)
ver 0.1.3 - 2011.01.02 by migius
- added draw curves as sequence for "Draw_as_Curve"
- added toggle "Draw as one" as user preset in UI
- added draw POINT as mesh-vertex
- added draw_THICKNESS for LINE, ARC, CIRCLE, ELLIPSE, LWPOLYLINE and POLYLINE
- added draw_THICKNESS for SOLID, TRACE
ver 0.1.2 - 2010.12.27 by migius
- added draw() for TRACE
- fixed wrong vertex order in SOLID
- added CIRCLE resolution as user preset in UI
- added closing segment for circular LWPOLYLINE and POLYLINE
- fixed registering for 2.55beta
ver 0.1.1 - 2010.09.07 by migius
- fixed dxf-file names recognition limited to ".dxf"
- fixed registering for 2.53beta
ver 0.1 - 2010.06.10 by Thomas Larsson
"""

__version__ = '.'.join([str(s) for s in bl_info['version']])

import os
import codecs
import math
from math import sin, cos, radians
import bpy
import mathutils
from mathutils import Vector, Matrix

#
#    Global flags
#

T_Merge = 0x01
T_NewScene = 0x02
T_Curves = 0x04
T_DrawOne = 0x08
T_Debug = 0x10
T_Verbose = 0x20
T_ThicON = 0x40

toggle = T_Merge | T_NewScene | T_DrawOne | T_ThicON
theCircleRes = 32
theMergeLimit = 1e-5

#
#    class CSection:
#

class CSection:
    type = None

    def __init__(self):
        self.data = []

    def display(self):
        print("Section", self.type)
        for datum in self.data:
            datum.display()

#
#    class CTable:
#

class CTable:
    def __init__(self):
        self.type = None
        self.name = None
        self.handle = None
        self.owner = None
        self.subclass = None
        self.nEntries = 0
    def display(self):
        print("Table %s %s %s %s %s %d" % (self.type, self.name, self.handle, self.owner, self.subclass, self.nEntries))

#
#    class CEntity:
#
class CEntity:
    def __init__(self, typ, drawtype):
        self.type = typ
        self.drawtype = drawtype
        self.handle = None
        self.owner = None
        self.subclass = None
        self.layer = 0
        self.color = 0
        self.invisible = 0
        self.linetype_name = ''
        self.linetype_scale = 1.0
        self.paperspace = 0
        #self.normal = Vector((0,0,1))

    def display(self):
        print("Entity %s %s %s %s %s %s %x" % 
            (self.type, self.handle, self.owner, self.subclass, self.layer, self.color, self.invisible))

    def build(self, vn=0):
        global toggle
        if toggle & T_Debug:
            raise NameError("Warning: can not build - unsupported entity type: %s" % self.type)
        return(([], [], [], vn)) 

    def draw(self):
        global toggle
        if toggle & T_Debug:
            raise NameError("Warning: can not draw - unsupported entity type: %s" % self.type)
        return


DxfCommonAttributes = {
    5 : 'handle',
    6 : 'linetype_name',
    8 : 'layer',
    48 : 'linetype_scale',
    60 : 'invisible',
    62 : 'color',
    67 : 'paperspace',
    100 : 'subclass',
    330 : 'owner',
    360 : 'owner',
}

#
#    class C3dFace(CEntity):
#    10 : 'point0.x', 20 : 'point0.y', 30 : 'point0.z', 
#    11 : 'point1.x', 21 : 'point1.y', 31 : 'point1.z', 
#    12 : 'point2.x', 22 : 'point2.y', 32 : 'point2.z', 
#    13 : 'point3.x', 23 : 'point3.y', 33 : 'point3.z', 
#    70 : 'flags',
#

class C3dFace(CEntity):
    def __init__(self):
        CEntity.__init__(self, '3DFACE', 'Mesh')