[gegl] GeglPath: expose lerp and point_dist functions

[Ãyvind KolÃs <ok src gnome org>]

commit d5957c9a10e19a8139a3e474aa6d21f094c45ccd
Author: Michael Murà <batolettre gmail com>
Date:   Thu Jun 30 13:30:24 2011 +0200

    GeglPath: expose lerp and point_dist functions

 gegl/property-types/gegl-path.c |   32 ++++++++++++--------------------
 gegl/property-types/gegl-path.h |   25 +++++++++++++++++++++++++
 2 files changed, 37 insertions(+), 20 deletions(-)
---
diff --git a/gegl/property-types/gegl-path.c b/gegl/property-types/gegl-path.c
index 37e318a..dfa9576 100644
--- a/gegl/property-types/gegl-path.c
+++ b/gegl/property-types/gegl-path.c
@@ -150,13 +150,6 @@ static void             gegl_path_list_calc_values    (GeglPathList     *path,
                                                        gdouble          *ys);
 static gdouble          gegl_path_list_get_length     (GeglPathList     *path);
 
-static void             lerp                          (Point            *dest,
-                                                       Point            *a,
-                                                       Point            *b,
-                                                       gfloat            t);
-static gdouble          point_dist                    (Point            *a,
-                                                       Point            *b);
-
 
 /* FIXME: handling of relative commands should be moved to the flattening stage */
 
@@ -1268,14 +1261,14 @@ bezier2 (GeglPathItem  *prev,
   Point ab,bc,cd,abbc,bccd;
 
   if (prev->type == 'c')
-    lerp (&ab, &prev->point[2], &curve->point[0], t);
+    point_lerp (&ab, &prev->point[2], &curve->point[0], t);
   else
-    lerp (&ab, &prev->point[0], &curve->point[0], t);
-  lerp (&bc, &curve->point[0], &curve->point[1], t);
-  lerp (&cd, &curve->point[1], &curve->point[2], t);
-  lerp (&abbc, &ab, &bc,t);
-  lerp (&bccd, &bc, &cd,t);
-  lerp (dest, &abbc, &bccd, t);
+    point_lerp (&ab, &prev->point[0], &curve->point[0], t);
+  point_lerp (&bc, &curve->point[0], &curve->point[1], t);
+  point_lerp (&cd, &curve->point[1], &curve->point[2], t);
+  point_lerp (&abbc, &ab, &bc,t);
+  point_lerp (&bccd, &bc, &cd,t);
+  point_lerp (dest, &abbc, &bccd, t);
 }
 
 static void
@@ -1461,7 +1454,7 @@ gegl_path_list_calc (GeglPathList *path,
                   Point spot;
                   gfloat ratio = (pos - traveled) / (next_pos - traveled);
 
-                  lerp (&spot, &a, &b, ratio);
+                  point_lerp (&spot, &a, &b, ratio);
 
                   *xd = spot.x;
                   *yd = spot.y;
@@ -1531,7 +1524,7 @@ gegl_path_list_calc_values (GeglPathList *path,
                   Point spot;
                   gfloat ratio = (next_sample - traveled) / (next_pos - traveled);
 
-                  lerp (&spot, &a, &b, ratio);
+                  point_lerp (&spot, &a, &b, ratio);
 
                   xs[i]=spot.x;
                   ys[i]=spot.y;
@@ -1613,9 +1606,8 @@ gegl_path_list_get_length (GeglPathList *path)
 }
 
 /***** Point *****/
-/* linear interpolation between two points */
-static void
-lerp (Point  *dest,
+void
+point_lerp (Point  *dest,
       Point  *a,
       Point  *b,
       gfloat  t)
@@ -1624,7 +1616,7 @@ lerp (Point  *dest,
   dest->y = a->y + (b->y-a->y) * t;
 }
 
-static gdouble
+gdouble
 point_dist (Point *a,
             Point *b)
 {
diff --git a/gegl/property-types/gegl-path.h b/gegl/property-types/gegl-path.h
index 28a1e3d..1e7bb5e 100644
--- a/gegl/property-types/gegl-path.h
+++ b/gegl/property-types/gegl-path.h
@@ -442,6 +442,31 @@ void                  gegl_path_add_flattener (GeglFlattenerFunc func);
  */
 GeglPathList *        gegl_path_get_flat_path (GeglPath *path);
 
+
+/**
+ * point_lerp:
+ * @dest: return location for the result
+ * @a: origin Point
+ * @b: destination Point
+ * @t: ratio between @a and @b
+ *
+ * linear interpolation between two Points
+ */
+void                  point_lerp              (Point            *dest,
+                                               Point            *a,
+                                               Point            *b,
+                                               gfloat            t);
+
+/**
+ * point_dist:
+ * @a: an arbitrary Point
+ * @b: an arbitrary Point
+ *
+ * Compute the distance between Point @a and @b
+ */
+gdouble               point_dist              (Point            *a,
+                                               Point            *b);
+
 G_END_DECLS
 
 #endif /* __GEGL_PATH_H__ */