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#include <glib.h>
#include <stdbool.h>
#include "animate.h"
#include "state.h"
#include "log.h"
double quadratic_bezier(double x, double a, double b, double c)
{
g_assert(x >= 0 && x <= 1);
g_assert(a >= 0 && a <= 1);
g_assert(b >= 0 && b <= 1);
g_assert(c >= 0 && c <= 1);
const double t = 1 - x;
return a * t * t + 2 * b * t * x + c * x * x;
}
double cubic_bezier(double x, double a, double b, double c, double d)
{
g_assert(x >= 0 && x <= 1);
g_assert(a >= 0 && a <= 1);
g_assert(b >= 0 && b <= 1);
g_assert(c >= 0 && c <= 1);
g_assert(d >= 0 && d <= 1);
const double t = 1 - x;
return a * (t * t * t) + 3 * b * (t * t * x) + 3 * c * (t * x * x) + d * (x * x * x);
}
typedef struct {
Animation anim;
gint64 start;
gint64 duration;
double x;
} AnimationShine;
bool shine_paint(AnimationShine *anim, cairo_t *cr, const Layout *layout)
{
gint64 now = g_get_monotonic_time();
if (anim->start == 0)
anim->start = now;
gint64 end = anim->start + anim->duration;
anim->x = 1.0;
if (now <= end) {
double t = (double)(now - anim->start) / (end - anim->start);
anim->x = cubic_bezier(t, 0.19, 1.0, 0.22, 1.0);
}
// Draw at x on the surface...
return false;
}
Animation *animation_shine_create(gint64 duration)
{
// Note the 0 initialization
AnimationShine *anim = g_malloc0(sizeof(AnimationShine));
anim->anim.type = ANIM_SHINE;
anim->anim.paint = (DrawFunc)shine_paint;
anim->duration = duration;
return (gpointer)anim;
}
void animation_destroy(Animation *anim)
{
//XXX
g_free(anim);
}
// vim: ts=4 sw=4 et
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