[gimp] app: Fix garbage appearing in generated brushes with dynamic angles

[Alexia Death <alexiade src gnome org>]

commit e79834b75ea9f47853fc0017195b2d8c7bce7fa6
Author: Alexia Death <alexiadeath gmail com>
Date:   Wed Dec 30 15:10:34 2009 +0200

    app: Fix garbage appearing in generated brushes with dynamic angles
    
    Rounds angle used in generated brushes to avoid floating point precision problems.

 app/core/gimpbrushgenerated.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/app/core/gimpbrushgenerated.c b/app/core/gimpbrushgenerated.c
index e18b096..3bde69b 100644
--- a/app/core/gimpbrushgenerated.c
+++ b/app/core/gimpbrushgenerated.c
@@ -558,6 +558,17 @@ gimp_brush_generated_get_half_size (GimpBrushGenerated      *gbrush,
   GimpVector2  x_axis;
   GimpVector2  y_axis;
 
+  /* Since floatongpoint is not really accurate, 
+   * we need to round to limit the errors. 
+   * Errors in some border cases resulted in 
+   * different height and width reported for 
+   * the same input value on calling procedure side.
+   * This became problem at the rise of dynamics that
+   * allows for any angle to turn up.
+   **/
+
+  angle_in_degrees = ROUND (angle_in_degrees * 1000.0) / 1000.0;
+
   s = sin (gimp_deg_to_rad (angle_in_degrees));
   c = cos (gimp_deg_to_rad (angle_in_degrees));