Bug#590857: fig export has wrong threshold for linewidth mapping

[Heine Larsen]

Package: dia
Version: 0.97.1-6




This is handled in plug-ins/xfig/xfig-export.c by the following:
...
   if (renderer->linewidth <= 0.3175) width = 1;
   else width = (int)((renderer->linewidth / 2.54) * 80.0);
...

Inserting the threshold-value in the scaling expression gives:
  0.3175/2.54*80 = 10

Changing the threshold to 0.03175 makes it possible to generate fig-files with
linewidths between 1 and 10.
See attached patch.

lines.dia shows some lines of different widths and lines.fig shows the result
of exporting to fig after applying the patch to dia.

--
Heine Larsen


--- dia-0.97.1.orig/plug-ins/xfig/xfig-export.c
+++ dia-0.97.1/plug-ins/xfig/xfig-export.c
@@ -295,7 +295,7 @@ figLineWidth(XfigRenderer *renderer)
 {
   int width = 0;
   /* Minimal line width in fig diagrams. */
-  if (renderer->linewidth <= 0.3175) width = 1;
+  if (renderer->linewidth <= 0.03175) width = 1;
   else width = (int)((renderer->linewidth / 2.54) * 80.0);
   return width;
 }

When exporting to fig format, small linewidths from 2-10 (in XFig 1/80 inch units) can not be generated and all gets mapped to width 1.

lines.dia
Description: application/dia-diagram

lines.fig
Description: application/xfig