libanim

changeset 49:fb9659ca5cf2

added ping-pong extrapolator
author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 13 Apr 2013 07:27:32 +0300
parents 9915b036863d
children b92a21c31008
files src/track.c src/track.h
diffstat 2 files changed, 12 insertions(+), 1 deletions(-) [+]
line diff
     1.1 --- a/src/track.c	Sun Mar 10 18:52:57 2013 +0200
     1.2 +++ b/src/track.c	Sat Apr 13 07:27:32 2013 +0300
     1.3 @@ -14,6 +14,7 @@
     1.4  static anm_time_t remap_extend(anm_time_t tm, anm_time_t start, anm_time_t end);
     1.5  static anm_time_t remap_clamp(anm_time_t tm, anm_time_t start, anm_time_t end);
     1.6  static anm_time_t remap_repeat(anm_time_t tm, anm_time_t start, anm_time_t end);
     1.7 +static anm_time_t remap_pingpong(anm_time_t tm, anm_time_t start, anm_time_t end);
     1.8  
     1.9  /* XXX keep this in sync with enum anm_interpolator at track.h */
    1.10  static float (*interp[])(float, float, float, float, float) = {
    1.11 @@ -28,6 +29,7 @@
    1.12  	remap_extend,
    1.13  	remap_clamp,
    1.14  	remap_repeat,
    1.15 +	remap_pingpong,
    1.16  	0
    1.17  };
    1.18  
    1.19 @@ -304,3 +306,11 @@
    1.20  	}
    1.21  	return (tm - start) % interv + start;*/
    1.22  }
    1.23 +
    1.24 +static anm_time_t remap_pingpong(anm_time_t tm, anm_time_t start, anm_time_t end)
    1.25 +{
    1.26 +	anm_time_t interv = end - start;
    1.27 +	anm_time_t x = remap_repeat(tm, start, end + interv);
    1.28 +
    1.29 +	return x > end ? end + interv - x : x;
    1.30 +}
     2.1 --- a/src/track.h	Sun Mar 10 18:52:57 2013 +0200
     2.2 +++ b/src/track.h	Sat Apr 13 07:27:32 2013 +0300
     2.3 @@ -16,7 +16,8 @@
     2.4  enum anm_extrapolator {
     2.5  	ANM_EXTRAP_EXTEND,	/* extend to infinity */
     2.6  	ANM_EXTRAP_CLAMP,	/* clamp to last value */
     2.7 -	ANM_EXTRAP_REPEAT	/* repeat motion */
     2.8 +	ANM_EXTRAP_REPEAT,	/* repeat motion */
     2.9 +	ANM_EXTRAP_PINGPONG	/* repeat with mirroring */
    2.10  };
    2.11  
    2.12  typedef long anm_time_t;