1 files changed, 81 insertions, 0 deletions
diff --git a/support/dxf_export/effect.py b/support/dxf_export/effect.py
new file mode 100644
index 0000000..09699b0
--- /dev/null
+++ b/support/dxf_export/effect.py
@@ -0,0 +1,81 @@
+"""
+Based on code from Aaron Spike. See http://www.bobcookdev.com/inkscape/inkscape-dxf.html
+"""
+
+import pkgutil
+from . import inkex, simpletransform, cubicsuperpath, cspsubdiv
+
+
+class DXFExportEffect(inkex.Effect):
+	def __init__(self):
+		inkex.Effect.__init__(self)
+		self._dxf_instructions = []
+		self._handle = 255
+		self._flatness = 0.1
+	
+	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_transformation):
+		layer = self._get_inkscape_layer(node)
+		path = cubicsuperpath.parsePath(node.get('d'))
+		
+		transformation = simpletransform.composeTransform(
+			document_transformation,
+			simpletransform.composeParents(node, [[1, 0, 0], [0, 1, 0]]))
+		
+		simpletransform.applyTransformToPath(transformation, path)
+		
+		self._add_dxf_path(layer, path)
+	
+	def effect(self):
+		height = self.unittouu(self.document.getroot().xpath('@height', namespaces = inkex.NSS)[0])
+		document_transformation = [[1, 0, 0], [0, -1, height]]
+		
+		for node in self.document.getroot().xpath('//svg:path', namespaces = inkex.NSS):
+			self._add_dxf_shape(node, document_transformation)
+	
+	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 _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 ''