Multi-Objects: UV_OT_export_layout (80%)

"""
Apart from the 'export as PNG' all seems to be working ok.

'Export to PNG' also seems to work but doesn't look acceptable because the mesh
wireframe modifier is used  to draw UV wireframes (I was going to see if a curve
object would be usable to draw wireframes). Something in setting the renderer up
could also be wrong or missing.
"""

D3507 by @Al

Note from reviewer: I can't get this addon to show in the menus. But the syntax
seems correct, and it's pep8 friendly, so no harm in committing it so I can
ask other devs to see why the addon is never registering here.

Also, some changes I made include making it pep8 friendly and replace:
['foo', 'bar'] with {'foo', 'bar'}.

1 files changed, 63 insertions, 54 deletions

diff --git a/io_mesh_uv_layout/export_uv_eps.py b/io_mesh_uv_layout/export_uv_eps.py
index a15dc266..d00e998a 100644
--- a/io_mesh_uv_layout/export_uv_eps.py
+++ b/io_mesh_uv_layout/export_uv_eps.py
@@ -21,66 +21,75 @@
 import bpy
 
 
-def write(fw, mesh, image_width, image_height, opacity, face_iter_func):
-    fw("%!PS-Adobe-3.0 EPSF-3.0\n")
-    fw("%%%%Creator: Blender %s\n" % bpy.app.version_string)
-    fw("%%Pages: 1\n")
-    fw("%%Orientation: Portrait\n")
-    fw("%%%%BoundingBox: 0 0 %d %d\n" % (image_width, image_height))
-    fw("%%%%HiResBoundingBox: 0.0 0.0 %.4f %.4f\n" %
-       (image_width, image_height))
-    fw("%%EndComments\n")
-    fw("%%Page: 1 1\n")
-    fw("0 0 translate\n")
-    fw("1.0 1.0 scale\n")
-    fw("0 0 0 setrgbcolor\n")
-    fw("[] 0 setdash\n")
-    fw("1 setlinewidth\n")
-    fw("1 setlinejoin\n")
-    fw("1 setlinecap\n")
+class Export_UV_EPS:
+    def begin(self, fw, image_size, opacity):
 
-    polys = mesh.polygons
+        self.fw = fw
+        self.image_width = image_size[0]
+        self.image_height = image_size[1]
+        self.opacity = opacity
 
-    if opacity > 0.0:
-        for i, mat in enumerate(mesh.materials if mesh.materials else [None]):
-            fw("/DRAW_%d {" % i)
-            fw("gsave\n")
-            if mat:
-                color = tuple((1.0 - ((1.0 - c) * opacity))
-                              for c in mat.diffuse_color)
-            else:
-                color = 1.0, 1.0, 1.0
-            fw("%.3g %.3g %.3g setrgbcolor\n" % color)
-            fw("fill\n")
-            fw("grestore\n")
-            fw("0 setgray\n")
-            fw("} def\n")
+        fw("%!PS-Adobe-3.0 EPSF-3.0\n")
+        fw("%%%%Creator: Blender %s\n" % bpy.app.version_string)
+        fw("%%Pages: 1\n")
+        fw("%%Orientation: Portrait\n")
+        fw("%%%%BoundingBox: 0 0 %d %d\n" % (self.image_width, self.image_height))
+        fw("%%%%HiResBoundingBox: 0.0 0.0 %.4f %.4f\n" %
+           (self.image_width, self.image_height))
+        fw("%%EndComments\n")
+        fw("%%Page: 1 1\n")
+        fw("0 0 translate\n")
+        fw("1.0 1.0 scale\n")
+        fw("0 0 0 setrgbcolor\n")
+        fw("[] 0 setdash\n")
+        fw("1 setlinewidth\n")
+        fw("1 setlinejoin\n")
+        fw("1 setlinecap\n")
 
-        # fill
+    def build(self, mesh, face_iter_func):
+        polys = mesh.polygons
+
+        if self.opacity > 0.0:
+            for i, mat in enumerate(mesh.materials if mesh.materials else [None]):
+                self.fw("/DRAW_%d {" % i)
+                self.fw("gsave\n")
+                if mat:
+                    color = tuple((1.0 - ((1.0 - c) * self.opacity))
+                                  for c in mat.diffuse_color)
+                else:
+                    color = 1.0, 1.0, 1.0
+                self.fw("%.3g %.3g %.3g setrgbcolor\n" % color)
+                self.fw("fill\n")
+                self.fw("grestore\n")
+                self.fw("0 setgray\n")
+                self.fw("} def\n")
+
+            # fill
+            for i, uvs in face_iter_func():
+                self.fw("newpath\n")
+                for j, uv in enumerate(uvs):
+                    uv_scale = (uv[0] * self.image_width, uv[1] * self.image_height)
+                    if j == 0:
+                        self.fw("%.5f %.5f moveto\n" % uv_scale)
+                    else:
+                        self.fw("%.5f %.5f lineto\n" % uv_scale)
+
+                self.fw("closepath\n")
+                self.fw("DRAW_%d\n" % polys[i].material_index)
+
+        # stroke only
         for i, uvs in face_iter_func():
-            fw("newpath\n")
+            self.fw("newpath\n")
             for j, uv in enumerate(uvs):
-                uv_scale = (uv[0] * image_width, uv[1] * image_height)
+                uv_scale = (uv[0] * self.image_width, uv[1] * self.image_height)
                 if j == 0:
-                    fw("%.5f %.5f moveto\n" % uv_scale)
+                    self.fw("%.5f %.5f moveto\n" % uv_scale)
                 else:
-                    fw("%.5f %.5f lineto\n" % uv_scale)
-
-            fw("closepath\n")
-            fw("DRAW_%d\n" % polys[i].material_index)
-
-    # stroke only
-    for i, uvs in face_iter_func():
-        fw("newpath\n")
-        for j, uv in enumerate(uvs):
-            uv_scale = (uv[0] * image_width, uv[1] * image_height)
-            if j == 0:
-                fw("%.5f %.5f moveto\n" % uv_scale)
-            else:
-                fw("%.5f %.5f lineto\n" % uv_scale)
+                    self.fw("%.5f %.5f lineto\n" % uv_scale)
 
-        fw("closepath\n")
-        fw("stroke\n")
+            self.fw("closepath\n")
+            self.fw("stroke\n")
 
-    fw("showpage\n")
-    fw("%%EOF\n")
+    def end(self):
+        self.fw("showpage\n")
+        self.fw("%%EOF\n")