I stumbled upon this link describing the use of the Diagonal (45 degree diagonal from each corner of an image) as the optimum crop guide ("better" than rule-of-thirds or golden rule).
http://www.diagonaalmethode.nl/
I hacked together a patch to add the Diagonal crop guide. So, should I open an enhancement bugzilla and include the patch? My patch isn't perfect - hence posting here since it requires some discussion. If the crop box is a portrait, then it works, if landscape (X > Y) then the guides extend beyond the crop rectangle. I don't know how to fix this cleanly (using an if statement doesn't seem efficient).
Any guidance (on or off list) would be appreciated. Thanks...Tim
--
Tim Jedlicka, Network Entomologist
bonzo@xxxxxxxxxxxx, http://www.galifree.com
Patch against gimp-2.4.1
--- gimprectangletool.c 2007-11-05 00:37:39.000000000 -0600
+++ gimprectangletool.c.diag 2007-11-05 17:06:49.000000000 -0600
@@ -1746,6 +1746,25 @@ gimp_rectangle_tool_draw_guides (GimpDra
((1 + SQRT5) * x1 + 2 * x2) / (3 + SQRT5),
y2, FALSE);
break;
+
+ case GIMP_RECTANGLE_GUIDE_DIAGONAL:
+ gimp_draw_tool_draw_line (draw_tool,
+ x1,y1,
+ x2,y1 + (x2 - x1),
+ FALSE);
+ gimp_draw_tool_draw_line (draw_tool,
+ x1,y2,
+ x2,y2 - (x2 - x1),
+ FALSE);
+ gimp_draw_tool_draw_line (draw_tool,
+ x2,y1,
+ x1,y1 + (x2 - x1),
+ FALSE);
+ gimp_draw_tool_draw_line (draw_tool,
+ x2,y2,
+ x1,y2 - (x2 - x1),
+ FALSE);
+ break;
}
}
--- tools-enums.h 2007-11-05 16:56:47.000000000 -0600
+++ tools-enums.h.diag 2007-11-05 16:57:56.000000000 -0600
@@ -45,7 +45,8 @@ typedef enum
GIMP_RECTANGLE_GUIDE_NONE, /*< desc="No guides" >*/
GIMP_RECTANGLE_GUIDE_CENTER_LINES, /*< desc="Center lines" >*/
GIMP_RECTANGLE_GUIDE_THIRDS, /*< desc="Rule of thirds" >*/
- GIMP_RECTANGLE_GUIDE_GOLDEN /*< desc="Golden sections" >*/
+ GIMP_RECTANGLE_GUIDE_GOLDEN, /*< desc="Golden sections" >*/
+ GIMP_RECTANGLE_GUIDE_DIAGONAL /*< desc="Diagonal lines" >*/
} GimpRectangleGuide;
--- tools-enums.c 2007-11-05 16:56:38.000000000 -0600
+++ tools-enums.c.diag 2007-11-05 16:59:07.000000000 -0600
@@ -50,6 +50,7 @@ gimp_rectangle_guide_get_type (void)
{ GIMP_RECTANGLE_GUIDE_CENTER_LINES, "GIMP_RECTANGLE_GUIDE_CENTER_LINES", "center-lines" },
{ GIMP_RECTANGLE_GUIDE_THIRDS, "GIMP_RECTANGLE_GUIDE_THIRDS", "thirds" },
{ GIMP_RECTANGLE_GUIDE_GOLDEN, "GIMP_RECTANGLE_GUIDE_GOLDEN", "golden" },
+ { GIMP_RECTANGLE_GUIDE_DIAGONAL, "GIMP_RECTANGLE_GUIDE_DIAGONAL", "diagonal" },
{ 0, NULL, NULL }
};
@@ -59,6 +60,7 @@ gimp_rectangle_guide_get_type (void)
{ GIMP_RECTANGLE_GUIDE_CENTER_LINES, N_("Center lines"), NULL },
{ GIMP_RECTANGLE_GUIDE_THIRDS, N_("Rule of thirds"), NULL },
{ GIMP_RECTANGLE_GUIDE_GOLDEN, N_("Golden sections"), NULL },
+ { GIMP_RECTANGLE_GUIDE_DIAGONAL, N_("Diagonal lines"), NULL },
{ 0, NULL, NULL }
};
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