15 files changed, 1029 insertions, 1070 deletions
diff --git a/support/dxf_export/__main__.py b/support/dxf_export/__main__.py
index 76c2121..c770a0e 100644
--- a/support/dxf_export/__main__.py
+++ b/support/dxf_export/__main__.py
@@ -1,14 +1,14 @@
 import sys, os, xml.etree.ElementTree, shutil
 from lib import util
-from . import better_dxf_outlines
+from . import effect
 
 
 def _export_dxf(in_path, out_path):
-	dxf_export = better_dxf_outlines.MyEffect()
+	dxf_export = effect.DXFExportEffect()
 	dxf_export.affect(args = [in_path], output = False)
 	
 	with open(out_path, 'w') as file:
-		file.write(dxf_export.dxf)
+		dxf_export.write(file)
 
 
 def _get_inkscape_layer_count(svg_path):
@@ -76,4 +76,10 @@ def main(in_path, out_path):
 		_export_dxf(temp_svg_path, out_path)
 
 
-main(*sys.argv[1:])
+try:
+	main(*sys.argv[1:])
+except util.UserError as e:
+	print 'Error:', e
+	sys.exit(1)
+except KeyboardInterrupt:
+	sys.exit(2)
diff --git a/support/dxf_export/better_dxf_outlines.py b/support/dxf_export/better_dxf_outlines.py
deleted file mode 100755
index 19ec6c8..0000000
--- a/support/dxf_export/better_dxf_outlines.py
+++ /dev/null
@@ -1,123 +0,0 @@
-#!/usr/bin/env python 
-'''
-Copyright (C) 2005,2007 Aaron Spike, aaron@ekips.org
-- template dxf_outlines.dxf added Feb 2008 by Alvin Penner, penner@vaxxine.com
-- layers, transformation, flattening added April 2008 by Bob Cook, bob@bobcookdev.com
-- bug fix for xpath() calls added February 2009 by Bob Cook, bob@bobcookdev.com
-- max value of 10 on path flattening, August 2011 by Bob Cook, bob@bobcookdev.com
-
-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
-'''
-import inkex, simplepath, simpletransform, cubicsuperpath, cspsubdiv, dxf_templates, re
-
-class MyEffect(inkex.Effect):
-
-    def __init__(self):
-    
-        inkex.Effect.__init__(self)
-        self.dxf = ''
-        self.handle = 255
-        self.flatness = 0.1
-        
-    def output(self):
-        print self.dxf
-        
-    def dxf_add(self, str):
-        self.dxf += str
-        
-    def dxf_insert_code(self, code, value):
-        self.dxf += code + "\n" + value + "\n"
-        
-    def dxf_line(self,layer,csp):
-        self.dxf_insert_code(   '0', 'LINE' )
-        self.dxf_insert_code(   '8', layer )
-        self.dxf_insert_code(  '62', '4' )
-        self.dxf_insert_code(   '5', '%x' % self.handle )
-        self.dxf_insert_code( '100', 'AcDbEntity' )
-        self.dxf_insert_code( '100', 'AcDbLine' )
-        self.dxf_insert_code(  '10', '%f' % csp[0][0] )
-        self.dxf_insert_code(  '20', '%f' % csp[0][1] )
-        self.dxf_insert_code(  '30', '0.0' )
-        self.dxf_insert_code(  '11', '%f' % csp[1][0] )
-        self.dxf_insert_code(  '21', '%f' % csp[1][1] )
-        self.dxf_insert_code(  '31', '0.0' )
-        
-    def dxf_point(self,layer,x,y):
-        self.dxf_insert_code(   '0', 'POINT' )
-        self.dxf_insert_code(   '8', layer )
-        self.dxf_insert_code(  '62', '4' )
-        self.dxf_insert_code(   '5', '%x' % self.handle )
-        self.dxf_insert_code( '100', 'AcDbEntity' )
-        self.dxf_insert_code( '100', 'AcDbPoint' )
-        self.dxf_insert_code(  '10', '%f' % x )
-        self.dxf_insert_code(  '20', '%f' % y )
-        self.dxf_insert_code(  '30', '0.0' )
-        
-    def dxf_path_to_lines(self,layer,p):
-        f = self.flatness
-        is_flat = 0
-        while is_flat < 1:
-            if f > 10:
-                break
-            try:
-                cspsubdiv.cspsubdiv(p, f)
-                is_flat = 1
-            except:
-                f += 0.1
-        
-        for sub in p:
-            for i in range(len(sub)-1):
-                self.handle += 1
-                s = sub[i]
-                e = sub[i+1]
-                self.dxf_line(layer,[s[1],e[1]])
-    
-    def dxf_path_to_point(self,layer,p):
-        bbox = simpletransform.roughBBox(p)
-        x = (bbox[0] + bbox[1]) / 2
-        y = (bbox[2] + bbox[3]) / 2
-        self.dxf_point(layer,x,y)
-        
-    def effect(self):
-        self.dxf_insert_code( '999', 'Inkscape export via "Better DXF Output" (bob@bobcookdev.com)' )
-        self.dxf_add( dxf_templates.r14_header )
-        
-        scale = 25.4/90.0
-        h = inkex.unittouu(self.document.getroot().xpath('@height',namespaces=inkex.NSS)[0])
-        
-        path = '//svg:path'
-        for node in self.document.getroot().xpath(path,namespaces=inkex.NSS):
-        
-            layer = node.getparent().get(inkex.addNS('label','inkscape'))
-            if layer == None:
-                layer = 'Layer 1'
-            
-            d = node.get('d')
-            p = cubicsuperpath.parsePath(d)
-            
-            t = node.get('transform')
-            if t != None:
-                m = simpletransform.parseTransform(t)
-                simpletransform.applyTransformToPath(m,p)
-            
-            m = [[scale,0,0],[0,-scale,h*scale]]
-            simpletransform.applyTransformToPath(m,p)
-    
-            if re.search('drill$',layer,re.I) == None:
-                self.dxf_path_to_lines(layer,p)
-            else:    
-                self.dxf_path_to_point(layer,p)
-                    
-        self.dxf_add( dxf_templates.r14_footer )
diff --git a/support/dxf_export/bezmisc.py b/support/dxf_export/bezmisc.py
index e663fa6..b7f5429 100755
--- a/support/dxf_export/bezmisc.py
+++ b/support/dxf_export/bezmisc.py
@@ -243,7 +243,6 @@ def beziertatlength(((bx0,by0),(bx1,by1),(bx2,by2),(bx3,by3)), l = 0.5, toleranc
 bezierlength = bezierlengthSimpson
 
 if __name__ == '__main__':
-    import timing
     #print linebezierintersect(((,),(,)),((,),(,),(,),(,)))
     #print linebezierintersect(((0,1),(0,-1)),((-1,0),(-.5,0),(.5,0),(1,0)))
     tol = 0.00000001
@@ -271,4 +270,4 @@ if __name__ == '__main__':
         print beziertatlength(curve,0.5)
 
 
-# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
+# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
diff --git a/support/dxf_export/cubicsuperpath.py b/support/dxf_export/cubicsuperpath.py
index af61acb..925efdb 100755
--- a/support/dxf_export/cubicsuperpath.py
+++ b/support/dxf_export/cubicsuperpath.py
@@ -46,8 +46,8 @@ def ArcToPath(p1,params):
     rx,ry,teta,longflag,sweepflag,x2,y2=params[:]
     teta = teta*pi/180.0
     B=[x2,y2]
-    if rx==0 or ry==0:
-        return([[A,A,A],[B,B,B]])
+    if rx==0 or ry==0 or A==B:
+        return([[A[:],A[:],A[:]],[B[:],B[:],B[:]]])
     mat=matprod((rotmat(teta),[[1/rx,0],[0,1/ry]],rotmat(-teta)))
     applymat(mat, A)
     applymat(mat, B)
@@ -166,4 +166,4 @@ def formatPath(p):
     return simplepath.formatPath(unCubicSuperPath(p))
 
 
-# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
+# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
diff --git a/support/dxf_export/dxf_footer.txt b/support/dxf_export/dxf_footer.txt
new file mode 100644
index 0000000..a225dd7
--- /dev/null
+++ b/support/dxf_export/dxf_footer.txt
@@ -0,0 +1,62 @@
+0
+ENDSEC
+0
+SECTION
+2
+OBJECTS
+0
+DICTIONARY
+5
+C
+330
+0
+100
+AcDbDictionary
+3
+ACAD_GROUP
+350
+D
+3
+ACAD_MLINESTYLE
+350
+17
+0
+DICTIONARY
+5
+D
+330
+C
+100
+AcDbDictionary
+0
+DICTIONARY
+5
+1A
+330
+C
+100
+AcDbDictionary
+0
+DICTIONARY
+5
+17
+330
+C
+100
+AcDbDictionary
+3
+STANDARD
+350
+18
+0
+DICTIONARY
+5
+19
+330
+C
+100
+AcDbDictionary
+0
+ENDSEC
+0
+EOF
diff --git a/support/dxf_export/dxf_header.txt b/support/dxf_export/dxf_header.txt
new file mode 100644
index 0000000..341cb1b
--- /dev/null
+++ b/support/dxf_export/dxf_header.txt
@@ -0,0 +1,580 @@
+0
+SECTION
+2
+HEADER
+9
+$ACADVER
+1
+AC1014
+9
+$HANDSEED
+5
+FFFF
+0
+ENDSEC
+0
+SECTION
+2
+TABLES
+0
+TABLE
+2
+VPORT
+5
+8
+330
+0
+100
+AcDbSymbolTable
+70
+4
+0
+VPORT
+5
+2E
+330
+8
+100
+AcDbSymbolTableRecord
+100
+AcDbViewportTableRecord
+2
+*ACTIVE
+70
+0
+10
+0.0
+20
+0.0
+11
+1.0
+21
+1.0
+12
+4.25
+22
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+14
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+0
+TABLE
+2
+LTYPE
+5
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+330
+0
+100
+AcDbSymbolTable
+70
+1
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+LTYPE
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+330
+5
+100
+AcDbSymbolTableRecord
+100
+AcDbLinetypeTableRecord
+2
+BYBLOCK
+70
+0
+3
+
+72
+65
+73
+0
+40
+0.0
+0
+LTYPE
+5
+15
+330
+5
+100
+AcDbSymbolTableRecord
+100
+AcDbLinetypeTableRecord
+2
+BYLAYER
+70
+0
+3
+
+72
+65
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+0
+40
+0.0
+0
+LTYPE
+5
+16
+330
+5
+100
+AcDbSymbolTableRecord
+100
+AcDbLinetypeTableRecord
+2
+CONTINUOUS
+70
+0
+3
+Solid line
+72
+65
+73
+0
+40
+0.0
+0
+ENDTAB
+0
+TABLE
+2
+LAYER
+5
+2
+330
+0
+100
+AcDbSymbolTable
+70
+1
+0
+LAYER
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+10
+330
+2
+100
+AcDbSymbolTableRecord
+100
+AcDbLayerTableRecord
+2
+0
+70
+0
+62
+7
+6
+CONTINUOUS
+0
+ENDTAB
+0
+TABLE
+2
+STYLE
+5
+3
+330
+0
+100
+AcDbSymbolTable
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+AcDbSymbolTableRecord
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+AcDbTextStyleTableRecord
+2
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+70
+0
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+0
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+
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+TABLE
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+330
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+BLOCK_RECORD
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+AcDbBlockTableRecord
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+*MODEL_SPACE
+0
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+AcDbSymbolTableRecord
+100
+AcDbBlockTableRecord
+2
+*PAPER_SPACE
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+2
+BLOCKS
+0
+BLOCK
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+AcDbBlockBegin
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+*PAPER_SPACE
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+ENTITIES
diff --git a/support/dxf_export/dxf_templates.py b/support/dxf_export/dxf_templates.py
deleted file mode 100755
index fb26632..0000000
--- a/support/dxf_export/dxf_templates.py
+++ /dev/null
@@ -1,645 +0,0 @@
-r14_header = '''  0
-SECTION
-  2
-HEADER
-  9
-$ACADVER
-  1
-AC1014
-  9
-$HANDSEED
-  5
-FFFF
-  0
-ENDSEC
-  0
-SECTION
-  2
-TABLES
-  0
-TABLE
-  2
-VPORT
-  5
-8
-330
-0
-100
-AcDbSymbolTable
- 70
-     4
-  0
-VPORT
-  5
-2E
-330
-8
-100
-AcDbSymbolTableRecord
-100
-AcDbViewportTableRecord
-  2
-*ACTIVE
- 70
-     0
- 10
-0.0
- 20
-0.0
- 11
-1.0
- 21
-1.0
- 12
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- 22
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-
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-  4
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-  0
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-  2
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-  5
-6
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-AcDbSymbolTable
- 70
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-  0
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- 70
-     0
-  0
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-  0
-TABLE
-  2
-APPID
-  5
-9
-330
-0
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-AcDbSymbolTable
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-AcDbRegAppTableRecord
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-TABLE
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-0.625
- 71
-     0
- 72
-     0
- 73
-     0
- 74
-     0
- 75
-     0
- 76
-     0
- 77
-     1
- 78
-     8
-170
-     0
-171
-     3
-172
-     1
-173
-     0
-174
-     0
-175
-     0
-176
-     0
-177
-     0
-178
-     0
-270
-     2
-271
-     2
-272
-     2
-273
-     2
-274
-     3
-340
-11
-275
-     0
-280
-     0
-281
-     0
-282
-     0
-283
-     0
-284
-     8
-285
-     0
-286
-     0
-287
-     3
-288
-     0
-  0
-ENDTAB
-  0
-TABLE
-  2
-BLOCK_RECORD
-  5
-1
-330
-0
-100
-AcDbSymbolTable
- 70
-     1
-  0
-BLOCK_RECORD
-  5
-1F
-330
-1
-100
-AcDbSymbolTableRecord
-100
-AcDbBlockTableRecord
-  2
-*MODEL_SPACE
-  0
-BLOCK_RECORD
-  5
-1B
-330
-1
-100
-AcDbSymbolTableRecord
-100
-AcDbBlockTableRecord
-  2
-*PAPER_SPACE
-  0
-ENDTAB
-  0
-ENDSEC
-  0
-SECTION
-  2
-BLOCKS
-  0
-BLOCK
-  5
-20
-330
-1F
-100
-AcDbEntity
-  8
-0
-100
-AcDbBlockBegin
-  2
-*MODEL_SPACE
- 70
-     0
- 10
-0.0
- 20
-0.0
- 30
-0.0
-  3
-*MODEL_SPACE
-  1
-
-  0
-ENDBLK
-  5
-21
-330
-1F
-100
-AcDbEntity
-  8
-0
-100
-AcDbBlockEnd
-  0
-BLOCK
-  5
-1C
-330
-1B
-100
-AcDbEntity
- 67
-     1
-  8
-0
-100
-AcDbBlockBegin
-  2
-*PAPER_SPACE
-  1
-
-  0
-ENDBLK
-  5
-1D
-330
-1B
-100
-AcDbEntity
- 67
-     1
-  8
-0
-100
-AcDbBlockEnd
-  0
-ENDSEC
-  0
-SECTION
-  2
-ENTITIES
-'''
-
-
-r14_footer = '''  0
-ENDSEC
-  0
-SECTION
-  2
-OBJECTS
-  0
-DICTIONARY
-  5
-C
-330
-0
-100
-AcDbDictionary
-  3
-ACAD_GROUP
-350
-D
-  3
-ACAD_MLINESTYLE
-350
-17
-  0
-DICTIONARY
-  5
-D
-330
-C
-100
-AcDbDictionary
-  0
-DICTIONARY
-  5
-1A
-330
-C
-100
-AcDbDictionary
-  0
-DICTIONARY
-  5
-17
-330
-C
-100
-AcDbDictionary
-  3
-STANDARD
-350
-18
-  0
-DICTIONARY
-  5
-19
-330
-C
-100
-AcDbDictionary
-  0
-ENDSEC
-  0
-EOF'''
diff --git a/support/dxf_export/effect.py b/support/dxf_export/effect.py
new file mode 100644
index 0000000..206ce9d
--- /dev/null
+++ b/support/dxf_export/effect.py
@@ -0,0 +1,175 @@
+"""
+Based on code from Aaron Spike. See http://www.bobcookdev.com/inkscape/inkscape-dxf.html
+"""
+
+import pkgutil, re
+from . import inkex, simpletransform, cubicsuperpath, cspsubdiv
+
+
+def _get_unit_factors_map():
+	# Fluctuates somewhat between Inkscape releases.
+	pixels_per_inch = 96.
+	pixels_per_mm = pixels_per_inch / 25.4
+	
+	return {
+		'px': 1.0,
+		'mm': pixels_per_mm,
+		'cm': pixels_per_mm * 10,
+      'm' : pixels_per_mm * 1e3,
+      'km': pixels_per_mm * 1e6,
+		'pt': pixels_per_inch / 72,
+      'pc': pixels_per_inch / 6,
+		'in': pixels_per_inch,
+      'ft': pixels_per_inch * 12,
+      'yd': pixels_per_inch * 36 }
+
+
+class DXFExportEffect(inkex.Effect):
+	_unit_factors = _get_unit_factors_map()
+	
+	def __init__(self):
+		inkex.Effect.__init__(self)
+		
+		self._dxf_instructions = []
+		self._handle = 255
+		self._flatness = 0.1
+	
+	def _get_user_unit(self):
+		"""
+		Return the size in pixels of the unit used for measures without an explicit unit.
+		"""
+		
+		document_height = self._measure_to_pixels(self._get_document_height_attr())
+		view_box_attr = self.document.getroot().get('viewBox')
+		
+		if view_box_attr:
+			_, _, _, view_box_height = map(float, view_box_attr.split())
+		else:
+			view_box_height = document_height
+		
+		return document_height / view_box_height
+	
+	def _get_document_unit(self):
+		"""
+		Return the size in pixels that the user is working with in Inkscape.
+		"""
+		
+		inkscape_unit_attrs = self.document.getroot().xpath('./sodipodi:namedview/@inkscape:document-units', namespaces = inkex.NSS)
+		
+		if inkscape_unit_attrs:
+			unit = inkscape_unit_attrs[0]
+		else:
+			_, unit = self._parse_measure(self._get_document_height_attr())
+		
+		return self._get_unit_factor(unit)
+	
+	def _get_document_height_attr(self):
+		return self.document.getroot().xpath('@height', namespaces = inkex.NSS)[0]
+	
+	def _add_instruction(self, code, value):
+		self._dxf_instructions.append((code, str(value)))
+	
+	def _add_dxf_line(self, layer, csp):
+		self._add_instruction(0, 'LINE')
+		self._add_instruction(8, layer)
+		self._add_instruction(62, 4)
+		self._add_instruction(5, '{:x}'.format(self._handle))
+		self._add_instruction(100, 'AcDbEntity')
+		self._add_instruction(100, 'AcDbLine')
+		self._add_instruction(10, repr(csp[0][0]))
+		self._add_instruction(20, repr(csp[0][1]))
+		self._add_instruction(30, 0.0)
+		self._add_instruction(11, repr(csp[1][0]))
+		self._add_instruction(21, repr(csp[1][1]))
+		self._add_instruction(31, 0.0)
+	
+	def _add_dxf_path(self, layer, path):
+		cspsubdiv.cspsubdiv(path, self._flatness)
+		
+		for sub in path:
+			for i in range(len(sub) - 1):
+				self._handle += 1
+				s = sub[i]
+				e = sub[i + 1]
+				self._add_dxf_line(layer, [s[1], e[1]])
+	
+	def _add_dxf_shape(self, node, document_transform, element_transform):
+		layer = self._get_inkscape_layer(node)
+		path = cubicsuperpath.parsePath(node.get('d'))
+		
+		transform = simpletransform.composeTransform(
+			document_transform,
+			simpletransform.composeParents(node, element_transform))
+		
+		simpletransform.applyTransformToPath(transform, path)
+		
+		self._add_dxf_path(layer, path)
+	
+	def effect(self):
+		user_unit = self._get_user_unit()
+		document_unit = self._get_document_unit()
+		height = self._measure_to_pixels(self._get_document_height_attr())
+		
+		document_transform = simpletransform.composeTransform(
+			[[1 / document_unit, 0, 0], [0, 1 / document_unit, 0]],
+			[[1, 0, 0], [0, -1, height]])
+		
+		element_transform = [[user_unit, 0, 0], [0, user_unit, 0]]
+		
+		for node in self.document.getroot().xpath('//svg:path', namespaces = inkex.NSS):
+			self._add_dxf_shape(node, document_transform, element_transform)
+	
+	def write(self, file):
+		file.write(pkgutil.get_data(__name__, 'dxf_header.txt'))
+		
+		for code, value in self._dxf_instructions:
+			print >> file, code
+			print >> file, value
+		
+		file.write(pkgutil.get_data(__name__, 'dxf_footer.txt'))
+	
+	@classmethod
+	def _parse_measure(cls, string):
+		value_match = re.match(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)', string)
+		unit_match = re.search('(%s)$' % '|'.join(cls._unit_factors.keys()), string)	
+		
+		value = float(string[value_match.start():value_match.end()])
+		
+		if unit_match:
+			unit = string[unit_match.start():unit_match.end()]
+		else:
+			unit = None
+
+		return value, unit
+	
+	@classmethod
+	def _measure_to_pixels(cls, string, default_unit_factor = None):
+		"""
+		Parse a string containing a measure and return it's value converted to pixels. If the measure has no unit, it will be assumed that the unit has the size of the specified number of pixels.
+		"""
+		
+		value, unit = cls._parse_measure(string)
+		
+		return value * cls._get_unit_factor(unit, default_unit_factor)
+	
+	@classmethod
+	def _get_inkscape_layer(cls, node):
+		while node is not None:
+			layer = node.get(inkex.addNS('label', 'inkscape'))
+			
+			if layer is not None:
+				return layer
+			
+			node = node.getparent()
+		
+		return ''
+	
+	@classmethod
+	def _get_unit_factor(cls, unit, default = None):
+		if unit is None:
+			if default is None:
+				default = 1
+			
+			return default
+		else:
+			return cls._unit_factors[unit]
diff --git a/support/dxf_export/ffgeom.py b/support/dxf_export/ffgeom.py
index 1983586..ef8799b 100755
--- a/support/dxf_export/ffgeom.py
+++ b/support/dxf_export/ffgeom.py
@@ -138,4 +138,4 @@ def dot(s1, s2):
     return s1.delta_x() * s2.delta_x() + s1.delta_y() * s2.delta_y()
 
 
-# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
+# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
diff --git a/support/dxf_export/inkex.py b/support/dxf_export/inkex.py
index e487822..19e860b 100755
--- a/support/dxf_export/inkex.py
+++ b/support/dxf_export/inkex.py
@@ -1,9 +1,16 @@
 #!/usr/bin/env python
+# -*- coding: utf-8 -*-
 """
 inkex.py
 A helper module for creating Inkscape extensions
 
-Copyright (C) 2005,2007 Aaron Spike, aaron@ekips.org
+Copyright (C) 2005,2010 Aaron Spike <aaron@ekips.org> and contributors
+
+Contributors:
+  Aurélio A. Heckert <aurium(a)gmail.com>
+  Bulia Byak <buliabyak@users.sf.net>
+  Nicolas Dufour, nicoduf@yahoo.fr
+  Peter J. R. Moulder <pjrm@users.sourceforge.net>
 
 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
@@ -19,10 +26,14 @@ 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
 """
-import sys, copy, optparse, random, re
+import copy
 import gettext
+import optparse
+import os
+import random
+import re
+import sys
 from math import *
-_ = gettext.gettext
 
 #a dictionary of all of the xmlns prefixes in a standard inkscape doc
 NSS = {
@@ -37,34 +48,35 @@ u'xlink'    :u'http://www.w3.org/1999/xlink',
 u'xml'      :u'http://www.w3.org/XML/1998/namespace'
 }
 
-#a dictionary of unit to user unit conversion factors
-uuconv = {'in':90.0, 'pt':1.25, 'px':1, 'mm':3.5433070866, 'cm':35.433070866, 'm':3543.3070866,
-          'km':3543307.0866, 'pc':15.0, 'yd':3240 , 'ft':1080}
-def unittouu(string):
-    '''Returns userunits given a string representation of units in another system'''
-    unit = re.compile('(%s)$' % '|'.join(uuconv.keys()))
-    param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
-
-    p = param.match(string)
-    u = unit.search(string)    
-    if p:
-        retval = float(p.string[p.start():p.end()])
+def localize():
+    domain = 'inkscape'
+    if sys.platform.startswith('win'):
+        import locale
+        current_locale, encoding = locale.getdefaultlocale()
+        os.environ['LANG'] = current_locale
+        try:
+            localdir = os.environ['INKSCAPE_LOCALEDIR'];
+            trans = gettext.translation(domain, localdir, [current_locale], fallback=True)
+        except KeyError:
+            trans = gettext.translation(domain, fallback=True)
+    elif sys.platform.startswith('darwin'):
+        try:
+            localdir = os.environ['INKSCAPE_LOCALEDIR'];
+            trans = gettext.translation(domain, localdir, fallback=True)
+        except KeyError:
+            try:
+                localdir = os.environ['PACKAGE_LOCALE_DIR'];
+                trans = gettext.translation(domain, localdir, fallback=True)
+            except KeyError:
+                trans = gettext.translation(domain, fallback=True)
     else:
-        retval = 0.0
-    if u:
         try:
-            return retval * uuconv[u.string[u.start():u.end()]]
+            localdir = os.environ['PACKAGE_LOCALE_DIR'];
+            trans = gettext.translation(domain, localdir, fallback=True)
         except KeyError:
-            pass
-    return retval
-
-def uutounit(val, unit):
-    return val/uuconv[unit]
-
-try:
-    from lxml import etree
-except:
-    sys.exit(_('The fantastic lxml wrapper for libxml2 is required by inkex.py and therefore this extension. Please download and install the latest version from http://cheeseshop.python.org/pypi/lxml/, or install it through your package manager by a command like: sudo apt-get install python-lxml'))
+            trans = gettext.translation(domain, fallback=True)
+    #sys.stderr.write(str(localdir) + "\n")
+    trans.install()
 
 def debug(what):
     sys.stderr.write(str(what) + "\n")
@@ -79,13 +91,31 @@ def errormsg(msg):
       
        Note that this should always be combined with translation:
 
-         import gettext
-         _ = gettext.gettext
+         import inkex
+         inkex.localize()
          ...
          inkex.errormsg(_("This extension requires two selected paths."))
     """
-    sys.stderr.write((unicode(msg) + "\n").encode("UTF-8"))
+    if isinstance(msg, unicode):
+        sys.stderr.write(msg.encode("UTF-8") + "\n")
+    else:
+        sys.stderr.write((unicode(msg, "utf-8", errors='replace') + "\n").encode("UTF-8"))
+
+def are_near_relative(a, b, eps):
+    if (a-b <= a*eps) and (a-b >= -a*eps):
+        return True
+    else:
+        return False
 
+
+# third party library
+try:
+    from lxml import etree
+except Exception, e:
+    localize()
+    errormsg(_("The fantastic lxml wrapper for libxml2 is required by inkex.py and therefore this extension. Please download and install the latest version from http://cheeseshop.python.org/pypi/lxml/, or install it through your package manager by a command like: sudo apt-get install python-lxml\n\nTechnical details:\n%s" % (e,)))
+    sys.exit()
+    
 def check_inkbool(option, opt, value):
     if str(value).capitalize() == 'True':
         return True
@@ -128,20 +158,37 @@ class Effect:
         """Collect command line arguments"""
         self.options, self.args = self.OptionParser.parse_args(args)
 
-    def parse(self,file=None):
+    def parse(self, filename=None):
         """Parse document in specified file or on stdin"""
-        try:
+
+        # First try to open the file from the function argument
+        if filename != None:
             try:
-                stream = open(file,'r')
-            except:
-                stream = open(self.svg_file,'r')
-        except:
+                stream = open(filename, 'r')
+            except Exception:
+                errormsg(_("Unable to open specified file: %s") % filename)
+                sys.exit()
+
+        # If it wasn't specified, try to open the file specified as
+        # an object member
+        elif self.svg_file != None:
+            try:
+                stream = open(self.svg_file, 'r')
+            except Exception:
+                errormsg(_("Unable to open object member file: %s") % self.svg_file)
+                sys.exit()
+
+        # Finally, if the filename was not specified anywhere, use
+        # standard input stream
+        else:
             stream = sys.stdin
+
         p = etree.XMLParser(huge_tree=True)
         self.document = etree.parse(stream, parser=p)
         self.original_document = copy.deepcopy(self.document)
         stream.close()
 
+    # defines view_center in terms of document units
     def getposinlayer(self):
         #defaults
         self.current_layer = self.document.getroot()
@@ -156,10 +203,10 @@ class Effect:
 
         xattr = self.document.xpath('//sodipodi:namedview/@inkscape:cx', namespaces=NSS)
         yattr = self.document.xpath('//sodipodi:namedview/@inkscape:cy', namespaces=NSS)
-        doc_height = unittouu(self.document.getroot().get('height'))
         if xattr and yattr:
-            x = xattr[0]
-            y = yattr[0]
+            x = self.unittouu( xattr[0] + 'px' )
+            y = self.unittouu( yattr[0] + 'px')
+            doc_height = self.unittouu(self.document.getroot().get('height'))
             if x and y:
                 self.view_center = (float(x), doc_height - float(y)) # FIXME: y-coordinate flip, eliminate it when it's gone in Inkscape
 
@@ -236,6 +283,88 @@ class Effect:
             errormsg(_("No matching node for expression: %s") % path)
             retval = None
         return retval
+
+    #a dictionary of unit to user unit conversion factors
+    __uuconv = {'in':96.0, 'pt':1.33333333333, 'px':1.0, 'mm':3.77952755913, 'cm':37.7952755913,
+                'm':3779.52755913, 'km':3779527.55913, 'pc':16.0, 'yd':3456.0 , 'ft':1152.0}
+
+    # Function returns the unit used for the values in SVG.
+    # For lack of an attribute in SVG that explicitly defines what units are used for SVG coordinates,
+    # try to calculate the unit from the SVG width and SVG viewbox.
+    # Defaults to 'px' units.
+    def getDocumentUnit(self):
+        svgunit = 'px' #default to pixels
+
+        svgwidth = self.document.getroot().get('width')
+        viewboxstr = self.document.getroot().get('viewBox')
+        if viewboxstr:
+            unitmatch = re.compile('(%s)$' % '|'.join(self.__uuconv.keys()))
+            param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
+
+            p = param.match(svgwidth)
+            u = unitmatch.search(svgwidth)    
             
+            width = 100 #default
+            viewboxwidth = 100 #default
+            svgwidthunit = 'px' #default assume 'px' unit
+            if p:
+                width = float(p.string[p.start():p.end()])
+            else:
+                errormsg(_("SVG Width not set correctly! Assuming width = 100"))
+            if u:
+                svgwidthunit = u.string[u.start():u.end()]
+
+            viewboxnumbers = []
+            for t in viewboxstr.split():
+                try:
+                    viewboxnumbers.append(float(t))
+                except ValueError:
+                    pass
+            if len(viewboxnumbers) == 4:  #check for correct number of numbers
+                viewboxwidth = viewboxnumbers[2]
+
+            svgunitfactor = self.__uuconv[svgwidthunit] * width / viewboxwidth
+
+            # try to find the svgunitfactor in the list of units known. If we don't find something, ...
+            eps = 0.01 #allow 1% error in factor
+            for key in self.__uuconv:
+                if are_near_relative(self.__uuconv[key], svgunitfactor, eps):
+                    #found match!
+                    svgunit = key;
+
+        return svgunit
+
+
+    def unittouu(self, string):
+        '''Returns userunits given a string representation of units in another system'''
+        unit = re.compile('(%s)$' % '|'.join(self.__uuconv.keys()))
+        param = re.compile(r'(([-+]?[0-9]+(\.[0-9]*)?|[-+]?\.[0-9]+)([eE][-+]?[0-9]+)?)')
+
+        p = param.match(string)
+        u = unit.search(string)    
+        if p:
+            retval = float(p.string[p.start():p.end()])
+        else:
+            retval = 0.0
+        if u:
+            try:
+                return retval * (self.__uuconv[u.string[u.start():u.end()]] / self.__uuconv[self.getDocumentUnit()])
+            except KeyError:
+                pass
+        else: # default assume 'px' unit
+            return retval / self.__uuconv[self.getDocumentUnit()]
+
+        return retval
+
+    def uutounit(self, val, unit):
+        return val / (self.__uuconv[unit] / self.__uuconv[self.getDocumentUnit()])
+
+    def addDocumentUnit(self, value):
+        ''' Add document unit when no unit is specified in the string '''
+        try:
+            float(value)
+            return value + self.getDocumentUnit()
+        except ValueError:
+            return value
 
-# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
+# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
diff --git a/support/dxf_export/simplepath.py b/support/dxf_export/simplepath.py
index f62b1b4..94ab092 100755
--- a/support/dxf_export/simplepath.py
+++ b/support/dxf_export/simplepath.py
@@ -209,4 +209,4 @@ def rotatePath(p, a, cx = 0, cy = 0):
                     params[i + 1] = (r * math.sin(theta)) + cy
 
 
-# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
+# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 fileencoding=utf-8 textwidth=99
diff --git a/support/dxf_export/simplestyle.py b/support/dxf_export/simplestyle.py
deleted file mode 100755
index 3ec971e..0000000
--- a/support/dxf_export/simplestyle.py
+++ /dev/null
@@ -1,244 +0,0 @@
-#!/usr/bin/env python
-"""
-simplestyle.py
-Two simple functions for working with inline css
-and some color handling on top.
-
-Copyright (C) 2005 Aaron Spike, aaron@ekips.org
-
-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
-"""
-
-svgcolors={
-    'aliceblue':'#f0f8ff',
-    'antiquewhite':'#faebd7',
-    'aqua':'#00ffff',
-    'aquamarine':'#7fffd4',
-    'azure':'#f0ffff',
-    'beige':'#f5f5dc',
-    'bisque':'#ffe4c4',
-    'black':'#000000',
-    'blanchedalmond':'#ffebcd',
-    'blue':'#0000ff',
-    'blueviolet':'#8a2be2',
-    'brown':'#a52a2a',
-    'burlywood':'#deb887',
-    'cadetblue':'#5f9ea0',
-    'chartreuse':'#7fff00',
-    'chocolate':'#d2691e',
-    'coral':'#ff7f50',
-    'cornflowerblue':'#6495ed',
-    'cornsilk':'#fff8dc',
-    'crimson':'#dc143c',
-    'cyan':'#00ffff',
-    'darkblue':'#00008b',
-    'darkcyan':'#008b8b',
-    'darkgoldenrod':'#b8860b',
-    'darkgray':'#a9a9a9',
-    'darkgreen':'#006400',
-    'darkgrey':'#a9a9a9',
-    'darkkhaki':'#bdb76b',
-    'darkmagenta':'#8b008b',
-    'darkolivegreen':'#556b2f',
-    'darkorange':'#ff8c00',
-    'darkorchid':'#9932cc',
-    'darkred':'#8b0000',
-    'darksalmon':'#e9967a',
-    'darkseagreen':'#8fbc8f',
-    'darkslateblue':'#483d8b',
-    'darkslategray':'#2f4f4f',
-    'darkslategrey':'#2f4f4f',
-    'darkturquoise':'#00ced1',
-    'darkviolet':'#9400d3',
-    'deeppink':'#ff1493',
-    'deepskyblue':'#00bfff',
-    'dimgray':'#696969',
-    'dimgrey':'#696969',
-    'dodgerblue':'#1e90ff',
-    'firebrick':'#b22222',
-    'floralwhite':'#fffaf0',
-    'forestgreen':'#228b22',
-    'fuchsia':'#ff00ff',
-    'gainsboro':'#dcdcdc',
-    'ghostwhite':'#f8f8ff',
-    'gold':'#ffd700',
-    'goldenrod':'#daa520',
-    'gray':'#808080',
-    'grey':'#808080',
-    'green':'#008000',
-    'greenyellow':'#adff2f',
-    'honeydew':'#f0fff0',
-    'hotpink':'#ff69b4',
-    'indianred':'#cd5c5c',
-    'indigo':'#4b0082',
-    'ivory':'#fffff0',
-    'khaki':'#f0e68c',
-    'lavender':'#e6e6fa',
-    'lavenderblush':'#fff0f5',
-    'lawngreen':'#7cfc00',
-    'lemonchiffon':'#fffacd',
-    'lightblue':'#add8e6',
-    'lightcoral':'#f08080',
-    'lightcyan':'#e0ffff',
-    'lightgoldenrodyellow':'#fafad2',
-    'lightgray':'#d3d3d3',
-    'lightgreen':'#90ee90',
-    'lightgrey':'#d3d3d3',
-    'lightpink':'#ffb6c1',
-    'lightsalmon':'#ffa07a',
-    'lightseagreen':'#20b2aa',
-    'lightskyblue':'#87cefa',
-    'lightslategray':'#778899',
-    'lightslategrey':'#778899',
-    'lightsteelblue':'#b0c4de',
-    'lightyellow':'#ffffe0',
-    'lime':'#00ff00',
-    'limegreen':'#32cd32',
-    'linen':'#faf0e6',
-    'magenta':'#ff00ff',
-    'maroon':'#800000',
-    'mediumaquamarine':'#66cdaa',
-    'mediumblue':'#0000cd',
-    'mediumorchid':'#ba55d3',
-    'mediumpurple':'#9370db',
-    'mediumseagreen':'#3cb371',
-    'mediumslateblue':'#7b68ee',
-    'mediumspringgreen':'#00fa9a',
-    'mediumturquoise':'#48d1cc',
-    'mediumvioletred':'#c71585',
-    'midnightblue':'#191970',
-    'mintcream':'#f5fffa',
-    'mistyrose':'#ffe4e1',
-    'moccasin':'#ffe4b5',
-    'navajowhite':'#ffdead',
-    'navy':'#000080',
-    'oldlace':'#fdf5e6',
-    'olive':'#808000',
-    'olivedrab':'#6b8e23',
-    'orange':'#ffa500',
-    'orangered':'#ff4500',
-    'orchid':'#da70d6',
-    'palegoldenrod':'#eee8aa',
-    'palegreen':'#98fb98',
-    'paleturquoise':'#afeeee',
-    'palevioletred':'#db7093',
-    'papayawhip':'#ffefd5',
-    'peachpuff':'#ffdab9',
-    'peru':'#cd853f',
-    'pink':'#ffc0cb',
-    'plum':'#dda0dd',
-    'powderblue':'#b0e0e6',
-    'purple':'#800080',
-    'red':'#ff0000',
-    'rosybrown':'#bc8f8f',
-    'royalblue':'#4169e1',
-    'saddlebrown':'#8b4513',
-    'salmon':'#fa8072',
-    'sandybrown':'#f4a460',
-    'seagreen':'#2e8b57',
-    'seashell':'#fff5ee',
-    'sienna':'#a0522d',
-    'silver':'#c0c0c0',
-    'skyblue':'#87ceeb',
-    'slateblue':'#6a5acd',
-    'slategray':'#708090',
-    'slategrey':'#708090',
-    'snow':'#fffafa',
-    'springgreen':'#00ff7f',
-    'steelblue':'#4682b4',
-    'tan':'#d2b48c',
-    'teal':'#008080',
-    'thistle':'#d8bfd8',
-    'tomato':'#ff6347',
-    'turquoise':'#40e0d0',
-    'violet':'#ee82ee',
-    'wheat':'#f5deb3',
-    'white':'#ffffff',
-    'whitesmoke':'#f5f5f5',
-    'yellow':'#ffff00',
-    'yellowgreen':'#9acd32'
-}
-
-def parseStyle(s):
-    """Create a dictionary from the value of an inline style attribute"""
-    if s is None:
-      return {}
-    else:
-      return dict([[x.strip() for x in i.split(":")] for i in s.split(";") if len(i.strip())])
-
-def formatStyle(a):
-    """Format an inline style attribute from a dictionary"""
-    return ";".join([att+":"+str(val) for att,val in a.iteritems()])
-
-def isColor(c):
-    """Determine if its a color we can use. If not, leave it unchanged."""
-    if c.startswith('#') and (len(c)==4 or len(c)==7):
-        return True
-    if c.lower() in svgcolors.keys():
-        return True
-    #might be "none" or some undefined color constant or rgb()
-    #however, rgb() shouldnt occur at this point
-    return False
-
-def parseColor(c):
-    """Creates a rgb int array"""
-    tmp = svgcolors.get(c.lower())
-    if tmp is not None:
-        c = tmp
-    elif c.startswith('#') and len(c)==4:
-        c='#'+c[1:2]+c[1:2]+c[2:3]+c[2:3]+c[3:]+c[3:]
-    elif c.startswith('rgb('):
-        # remove the rgb(...) stuff
-        tmp = c.strip()[4:-1]
-        numbers = [number.strip() for number in tmp.split(',')]
-        converted_numbers = []
-        if len(numbers) == 3:
-            for num in numbers:
-                if num.endswith(r'%'):
-                    converted_numbers.append(int(float(num[0:-1])*255/100))
-                else:
-                    converted_numbers.append(int(num))
-            return tuple(converted_numbers)
-        else:    
-            return (0,0,0)
-    try:
-        r=int(c[1:3],16)
-        g=int(c[3:5],16)
-        b=int(c[5:],16)
-    except:
-        # unknown color ...
-        # Return a default color. Maybe not the best thing to do but probably
-        # better than raising an exception. 
-       return(0,0,0)
-    return (r,g,b)
-
-def formatColoria(a):
-    """int array to #rrggbb"""
-    return '#%02x%02x%02x' % (a[0],a[1],a[2])
-
-def formatColorfa(a):
-    """float array to #rrggbb"""
-    return '#%02x%02x%02x' % (int(round(a[0]*255)),int(round(a[1]*255)),int(round(a[2]*255)))
-
-def formatColor3i(r,g,b):
-    """3 ints to #rrggbb"""
-    return '#%02x%02x%02x' % (r,g,b)
-
-def formatColor3f(r,g,b):
-    """3 floats to #rrggbb"""
-    return '#%02x%02x%02x' % (int(round(r*255)),int(round(g*255)),int(round(b*255)))
-
-
-# vim: expandtab shiftwidth=4 tabstop=8 softtabstop=4 encoding=utf-8 textwidth=99
diff --git a/support/dxf_export/simpletransform.py b/support/dxf_export/simpletransform.py
index 47cc61e..55082ed 100755
--- a/support/dxf_export/simpletransform.py
+++ b/support/dxf_export/simpletransform.py
@@ -21,8 +21,8 @@ barraud@math.univ-lille1.fr
 This code defines several functions to make handling of transform
 attribute easier.
 '''
-import inkex, cubicsuperpath, bezmisc, simplestyle
-import copy, math, re
+import inkex, cubicsuperpath
+import math, re
 
 def parseTransform(transf,mat=[[1.0, 0.0, 0.0], [0.0, 1.0, 0.0]]):
     if transf=="" or transf==None:
diff --git a/support/lib/util.py b/support/lib/util.py
index bede240..8b65e58 100644
--- a/support/lib/util.py
+++ b/support/lib/util.py
@@ -1,6 +1,10 @@
 import contextlib, subprocess, tempfile, shutil, re, os
 
 
+class UserError(Exception):
+	pass
+
+
 @contextlib.contextmanager
 def TemporaryDirectory():
 	dir = tempfile.mkdtemp()
@@ -15,7 +19,8 @@ def command(args):
 	process = subprocess.Popen(args)
 	process.wait()
 	
-	assert not process.returncode
+	if process.returncode:
+		raise UserError('Command failed: {}'.format(' '.join(args)))
 
 
 def bash_escape_string(string):
diff --git a/support/openscad/__main__.py b/support/openscad/__main__.py
index 08b2ab6..3c103e5 100644
--- a/support/openscad/__main__.py
+++ b/support/openscad/__main__.py
@@ -21,17 +21,32 @@ def main(in_path, out_path, deps_path):
 		temp_mk_path = os.path.join(temp_dir, 'mk')
 		temp_files_path = os.path.join(temp_dir, 'files')
 		
-		_openscad(in_path, out_path, temp_deps_path)
+		# OpenSCAD requires the output file name to end in .stl
+		temp_stl_path = os.path.join(temp_dir, 'out.stl')
+		
+		_openscad(in_path, temp_stl_path, temp_deps_path)
 		
 		mk_content = '%:; echo "$@" >> {}'.format(util.bash_escape_string(temp_files_path))
 		
+		# Use make to parse the dependency makefile written by OpenSCAD
 		util.write_file(temp_mk_path, mk_content.encode())
 		util.command(['make', '-s', '-B', '-f', temp_mk_path, '-f', temp_deps_path])
 		
+		# All dependencies as paths relative to the project root.
 		deps = set(map(relpath, util.read_file(temp_files_path).decode().splitlines()))
-		ignored_files = set(map(relpath, [temp_deps_path, temp_mk_path, in_path, out_path]))
 		
+		# Relative paths to all files that should not appear in the dependency makefile.
+		ignored_files = set(map(relpath, [in_path, temp_deps_path, temp_mk_path, temp_stl_path]))
+		
+		# Write output files.
 		_write_dependencies(deps_path, relpath(out_path), deps - ignored_files)
+		os.rename(temp_stl_path, out_path)
 
 
-main(*sys.argv[1:])
+try:
+	main(*sys.argv[1:])
+except util.UserError as e:
+	print 'Error:', e
+	sys.exit(1)
+except KeyboardInterrupt:
+	sys.exit(2)