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#include <glib.h>
#include <stdbool.h>
#include <math.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;
int width;
cairo_pattern_t *gradient;
} AnimationShine;
// FIXME: Not working for button group
bool shine_paint(AnimationShine *shine, cairo_t *cr, const Layout *layout)
{
gint64 now = g_get_monotonic_time();
if (shine->start == 0)
shine->start = now;
gint64 end = shine->start + shine->duration;
if (now > end) return false;
double t = (double)(now - shine->start) / (end - shine->start);
double pos = cubic_bezier(t, 0.19, 1.0, 0.22, 1.0);
double angle = atan((double)layout->height / layout->width);
// Make it double just to be sure
int h = 2 * (double)layout->height / cos(angle);
int x = layout->x + pos * layout->width - shine->width;
int y = layout->y;
cairo_matrix_t matrix;
cairo_matrix_init_translate(&matrix, -x, -y);
cairo_pattern_set_matrix(shine->gradient, &matrix);
int dx = layout->x + layout->width / 2;
int dy = layout->y + layout->height / 2;
cairo_translate(cr, dx, dy);
cairo_rotate(cr, -angle);
cairo_translate(cr, -dx, -dy);
cairo_set_operator(cr, CAIRO_OPERATOR_ATOP);
cairo_set_source(cr, shine->gradient);
cairo_rectangle(cr, x, y - (h - layout->height) / 2, shine->width, h);
cairo_fill(cr);
return true;
}
Animation *animation_shine_create(gint64 duration)
{
// Note the 0 initialization
AnimationShine *shine = g_malloc0(sizeof(AnimationShine));
shine->anim.type = ANIM_SHINE;
shine->anim.paint = (DrawFunc)shine_paint;
shine->duration = duration;
// TODO: Change it depending on container size
shine->width = 20;
shine->gradient = cairo_pattern_create_linear(0, 0, shine->width, 0);
cairo_pattern_add_color_stop_rgba(shine->gradient, 0, 1, 1, 1, 0);
cairo_pattern_add_color_stop_rgba(shine->gradient, 0.5, 1, 1, 1, 0.333);
cairo_pattern_add_color_stop_rgba(shine->gradient, 1, 1, 1, 1, 0);
return (gpointer)shine;
}
//XXX
void animation_destroy(Animation *anim)
{
if (anim == NULL) return;
if (anim->type == ANIM_SHINE)
cairo_pattern_destroy(CAST(anim, AnimationShine)->gradient);
g_free(anim);
}
// vim: ts=4 sw=4 et
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