shithub: puzzles

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There seems to be some odd behaviour when GTK is asked to draw an
outline polygon with a clipping rectangle active. I don't know or
care whether this is GTK or my X server or what, but I'm working
around it by drawing the lines myself, which seems to sort it out.

[originally from svn r6227]

--- a/gtk.c

+++ b/gtk.c

@@ -373,7 +373,17 @@

     }

     assert(outlinecolour >= 0);

     gdk_gc_set_foreground(fe->gc, &fe->colours[outlinecolour]);

-    gdk_draw_polygon(fe->pixmap, fe->gc, FALSE, points, npoints);

+

+    /*

+     * In principle we ought to be able to use gdk_draw_polygon for

+     * the outline as well. In fact, it turns out to interact badly

+     * with a clipping region, for no terribly obvious reason, so I

+     * draw the outline as a sequence of lines instead.

+     */

+    for (i = 0; i < npoints; i++)

+	gdk_draw_line(fe->pixmap, fe->gc,

+		      points[i].x, points[i].y,

+		      points[(i+1)%npoints].x, points[(i+1)%npoints].y);

     sfree(points);

 }