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/*
* animation.c
*
* Created by buzzert <buzzert@buzzert.net> 2019-01-20
*/
#include "animation.h"
#include <stdlib.h>
#include <sys/param.h>
/*
* Easing functions
*/
double anim_identity(double p)
{
return p;
}
double anim_qubic_ease_out(double p)
{
double f = (p - 1.0);
return (f * f * f) + 1;
}
double anim_quad_ease_out(double p)
{
return -(p * (p - 2.0));
}
/*
* Convenience calculation functions
*/
anim_time_interval_t anim_now()
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
long ms = (ts.tv_sec * 1000) + (ts.tv_nsec / 1000000);
return (ms / 1000.0);
}
double anim_progress_ease(animation_t *anim, const double duration, AnimationEasingFunc easing_f)
{
const anim_time_interval_t now = anim_now();
double progress = MAX(0.0, now - anim->start_time) / duration;
progress = easing_f(progress);
return (anim->direction == IN) ? progress : (1.0 - progress);
}
double anim_progress(animation_t *anim, const double duration)
{
return anim_progress_ease(anim, duration, anim_identity);
}
bool anim_complete(animation_t *anim, const double progress)
{
return (anim->direction == IN) ? progress >= 1.0 : progress <= 0.0;
}
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