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ref: 96626d9c10bd37d060f9cf843b717350c222a344
parent: e2b35b2fc4a2758b09cd2d556d5c058486e91573
author: Simon Tatham <anakin@pobox.com>
date: Wed Oct 9 16:44:50 EDT 2013 

Faintly highlight the leading diagonal of Group's grid.

This makes it easier to spot elements whose square is known, which is
useful in turn for identifying subgroups.

[originally from svn r10050]


--- a/unfinished/group.c
+++ b/unfinished/group.c
@@ -62,6 +62,7 @@
     COL_HIGHLIGHT,
     COL_ERROR,
     COL_PENCIL,
+    COL_DIAGONAL,
     NCOLOURS
 };
 
@@ -1495,6 +1496,10 @@
     ret[COL_PENCIL * 3 + 1] = 0.5F * ret[COL_BACKGROUND * 3 + 1];
     ret[COL_PENCIL * 3 + 2] = ret[COL_BACKGROUND * 3 + 2];
 
+    ret[COL_DIAGONAL * 3 + 0] = 0.95F * ret[COL_BACKGROUND * 3 + 0];
+    ret[COL_DIAGONAL * 3 + 1] = 0.95F * ret[COL_BACKGROUND * 3 + 1];
+    ret[COL_DIAGONAL * 3 + 2] = 0.95F * ret[COL_BACKGROUND * 3 + 2];
+
     *ncolours = NCOLOURS;
     return ret;
 }
@@ -1561,7 +1566,8 @@
 
     /* background needs erasing */
     draw_rect(dr, cx, cy, cw, ch,
-	      (tile & DF_HIGHLIGHT) ? COL_HIGHLIGHT : COL_BACKGROUND);
+	      (tile & DF_HIGHLIGHT) ? COL_HIGHLIGHT :
+              (x == y) ? COL_DIAGONAL : COL_BACKGROUND);
 
     /* dividers */
     if (tile & DF_DIVIDER_TOP)