uv_export_svg.py: don't group single-chunk objects; move id in front

uv_import_svg.py: reverse matrix multiplication; cosmetics

utils/Modeller/uv_export_svg.py

@@ -16,7 +16,8 @@ script can be used to re-import such a file. Each object and each group of adjac
 faces therein will be made a separate SVG group.
 """
 
-ID_SEPARATOR = '_____'
+ID_SEPARATOR = '_.._'
+FILL_COLOR = 'yellow'
 
 
 import Blender, sys
@@ -27,7 +28,10 @@ class Abort(Exception):
 		self.msg = msg
 
 
-def get_adjacent(pool):
+def get_adjacent_faces(pool):
+	if not len(pool):
+		return []
+
 	i, face = pool.popitem()
 	group = [face]
 
@@ -64,7 +68,7 @@ def write_svg(filename):
 	svg.write('<?xml version="1.0" standalone="no"?>\n')
 	svg.write('<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">\n\n')
 	svg.write('<svg width="%spx" height="%spx" viewBox="0 0 %d %d" xmlns="http://www.w3.org/2000/svg"' \
-			'version="1.1" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">\n'
+			' version="1.1" xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape">\n'
 			% (size, size, size, size))
 	svg.write("\t<desc>uv_export_svg.py: %s</desc>\n" % filename);
 	svg.write('\t<rect x="0" y="0" width="%d" height="%d" fill="none" stroke="blue" stroke-width="%f"/>\n'
@@ -79,25 +83,32 @@ def write_svg(filename):
 		if not mesh.faceUV:
 			continue
 		if mesh.name in unique_meshes:
-			#print "dropping duplicate mesh", mesh.name, "of object", o.name
 			continue
 		unique_meshes[mesh.name] = True
 
-		svg.write('\t<g style="fill:yellow; stroke:black stroke-width:1px" inkscape:label="%s" ' \
-				'id="%s">\n' % (o.name, o.name))
+		svg.write('\t<g style="fill:%s; stroke:black stroke-width:1px" inkscape:label="%s" ' \
+				'id="%s">\n' % (FILL_COLOR, o.name, o.name))
 
 		pool = {}
 		for f in mesh.faces:
 			pool[f.index] = f
 
+		groups = []
 		while len(pool):
-			svg.write('\t\t<g>\n')
-			for f in get_adjacent(pool):
-				svg.write('\t\t\t<polygon points="')
+			groups.append(get_adjacent_faces(pool))
+
+		for faces in groups:
+			indent = '\t\t'
+			if len(groups) > 1:
+				svg.write('\t\t<g>\n')
+				indent = '\t\t\t'
+			for f in faces:
+				svg.write('%s<polygon id="%s%s%d" points="' % (indent, mesh.name, ID_SEPARATOR, f.index))
 				for p in f.uv:
 					svg.write('%.8f,%.8f ' % (p[0] * size, size - p[1] * size))
-				svg.write('" id="%s%s%d"/>\n' % (mesh.name, ID_SEPARATOR, f.index))
-			svg.write('\t\t</g>\n')
+				svg.write('"/>\n')
+			if len(groups) > 1:
+				svg.write('\t\t</g>\n')
 
 		svg.write("\t</g>\n")
 

utils/Modeller/uv_import_svg.py

@@ -19,7 +19,7 @@ The choice has been made when the file was saved!
 """
 
 
-ID_SEPARATOR = '_____'
+ID_SEPARATOR = '_.._'
 
 
 import Blender, sys, math, re
@@ -46,12 +46,12 @@ class Matrix:
 		return "[Matrix %f %f %f %f %f %f]" % (self.a, self.b, self.c, self.d, self.e, self.f)
 
 	def multiply(self, mat):
-		a = self.a * mat.a + self.c * mat.b
-		b = self.b * mat.a + self.d * mat.b
-		c = self.a * mat.c + self.c * mat.d
-		d = self.b * mat.c + self.d * mat.d
-		e = self.a * mat.e + self.c * mat.f + self.e
-		f = self.b * mat.e + self.d * mat.f + self.f
+		a = mat.a * self.a + mat.c * self.b
+		b = mat.b * self.a + mat.d * self.b
+		c = mat.a * self.c + mat.c * self.d
+		d = mat.b * self.c + mat.d * self.d
+		e = mat.a * self.e + mat.c * self.f + mat.e
+		f = mat.b * self.e + mat.d * self.f + mat.f
 		self.a = a; self.b = b; self.c = c; self.d = d; self.e = e; self.f = f
 
 	def transform(self, u, v):
@@ -231,14 +231,12 @@ class import_svg:
 			print('bad polygon "%s"' % ident)
 			return
 
-		sep = ident.find(ID_SEPARATOR)
-		if sep < 0:
+		try:
+			meshname, num = ident.strip().split(ID_SEPARATOR, 2)
+		except:
 			print('broken id "%s"' % ident)
 			return
 
-		meshname = str(ident[:sep])
-		num = int(ident[sep + len(ID_SEPARATOR):])
-
 		if not meshname in self.meshes:
 			print('unknown mesh "%s"' % meshname)
 			return
@@ -254,7 +252,7 @@ class import_svg:
 				u, v = matrix.transform(u, v)
 			transuv.append((u / self.width, 1 - v / self.height))
 
-		for i, uv in enumerate(self.meshes[meshname].faces[num].uv):
+		for i, uv in enumerate(self.meshes[meshname].faces[int(num)].uv):
 			uv[0] = transuv[i][0]
 			uv[1] = transuv[i][1]