[gimp] app: fix angle calculation of generated brushes

[N/A <ell src gnome org>]

commit 27688ee752e225912507a768d4c3893e6e9dc160
Author: Ell <ell_se yahoo com>
Date:   Fri Dec 22 16:27:06 2017 -0500

    app: fix angle calculation of generated brushes
    
    ... so that we don't effectively take the absolute values of
    angles.

 app/core/gimpbrushgenerated.c |   14 +++-----------
 1 files changed, 3 insertions(+), 11 deletions(-)
---
diff --git a/app/core/gimpbrushgenerated.c b/app/core/gimpbrushgenerated.c
index 18bfac8..78e06ac 100644
--- a/app/core/gimpbrushgenerated.c
+++ b/app/core/gimpbrushgenerated.c
@@ -319,13 +319,9 @@ gimp_brush_generated_transform_size (GimpBrush *gbrush,
   if (aspect_ratio < 0.0)
     angle = angle + 0.25;
 
+  angle  = fmod (fmod (angle, 1.0) + 1.0, 1.0);
   angle *= 360;
 
-  if (angle < 0.0)
-    angle = -1.0 * fmod (angle, 180.0);
-  else if (angle > 180.0)
-    angle = fmod (angle, 180.0);
-
   gimp_brush_generated_get_size (brush,
                                  brush->shape,
                                  brush->radius * scale,
@@ -357,13 +353,9 @@ gimp_brush_generated_transform_mask (GimpBrush *gbrush,
   if (aspect_ratio < 0.0)
     angle = angle + 0.25;
 
+  angle  = fmod (fmod (angle, 1.0) + 1.0, 1.0);
   angle *= 360;
 
-  if (angle < 0.0)
-    angle = -1.0 * fmod (angle, 180.0);
-  else if (angle > 180.0)
-    angle = fmod (angle, 180.0);
-
   if (scale    == 1.0                 &&
       ratio    == brush->aspect_ratio &&
       angle    == brush->angle        &&
@@ -605,7 +597,7 @@ gimp_brush_generated_get_size (GimpBrushGenerated      *gbrush,
    * allows for any angle to turn up.
    **/
 
-  angle_in_degrees = ROUND (angle_in_degrees * 1000.0) / 1000.0;
+  angle_in_degrees = RINT (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));