src/moon-curves.h

   1 /*
   2  * moon-curves.h: A set of primitives + alghos for solving Y at X problmem
   3  *                for cubic curves. This is used ONLY for KeySpline animation,
   4  *                not used in any way for drawing.
   5  *
   6  * Contact:
   7  *   Moonlight List (moonlight-list@lists.ximian.com)
   8  *
   9  * Copyright 2007 Novell, Inc. (http://www.novell.com)
  10  *
  11  * See the LICENSE file included with the distribution for details.
  12  *
  13  */
  14
  15 #ifndef __MOON_CURVES_H__
  16 #define __MOON_CURVES_H__
  17
  18 #include <math.h>
  19 #include <glib.h>
  20
  21 G_BEGIN_DECLS
  22
  23 typedef struct
  24 {
  25         double x;
  26         double y;
  27 } moon_point;
  28
  29 typedef struct
  30 {
  31         moon_point c0;
  32         moon_point c1;
  33         moon_point c2;
  34         moon_point c3;
  35 } moon_cubic;
  36
  37 typedef struct
  38 {
  39         moon_point c0;
  40         moon_point c1;
  41         moon_point c2;
  42 } moon_quadratic;
  43
  44 void    moon_quadratic_from_cubic               (moon_quadratic *dest, moon_cubic *src);
  45 double  moon_quadratic_y_for_x                  (double x, moon_quadratic *src);
  46 double  moon_quadratic_array_y_for_x            (moon_quadratic *qarr, double x, int count);
  47 void    moon_convert_cubics_to_quadratics       (moon_quadratic *dest_array, moon_cubic *src_array, int count);
  48 void    moon_subdivide_cubic                    (moon_cubic *dest1, moon_cubic *dest2, moon_cubic *src);
  49 void    moon_subdivide_cubic_at_level           (moon_cubic *b, int lvl, moon_cubic *src);
  50
  51 G_END_DECLS
  52
  53 #endif
  54
  55
  56