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#include <glib.h>
#include <stdbool.h>
#include <math.h>
#include "animate.h"
#include "state.h"
#include "log.h"
double clamp(double x, double min, double max)
{
const double t = x < min ? min : x;
return t > max ? max : t;
}
double smoothstep(double x, double edge0, double edge1)
{
x = clamp((x - edge0) / (edge1 - edge0), 0, 1);
return x * x * (3.0 - 2.0 * x);
}
double quadratic_bezier(double x, double a, double b, double c)
{
g_assert(x >= 0 && x <= 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);
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;
int width;
cairo_pattern_t *gradient;
} AnimationShine;
static bool shine_func(AnimationShine *shine, Layout *layout, cairo_t *cr)
{
gint64 end = shine->anim.start + shine->anim.duration;
gint64 now = g_get_monotonic_time();
if (now > end) return false;
double t = (double)(now - shine->anim.start) / (end - shine->anim.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.after_func = (DrawFunc)shine_func;
shine->anim.duration = duration;
// TODO: Change it depending on container size
shine->width = 25;
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, 0.2);
cairo_pattern_add_color_stop_rgba(shine->gradient, 1, 1, 1, 1, 0);
return (gpointer)shine;
}
static bool pulse_func(Animation *pulse, Layout *layout, cairo_t *cr)
{
gint64 end = pulse->start + pulse->duration;
gint64 now = g_get_monotonic_time();
if (now > end) return false;
// After half the duration we invert direction
gint64 mid = pulse->start + pulse->duration / 2;
double t = now <= mid
? (double)(now - pulse->start) / (mid - pulse->start)
: 1.0 - (double)(now - mid) / (end - mid);
double pos = cubic_bezier(t, 0.19, 1.0, 0.22, 1.0);
int max = 0.15 * layout->height;
layout->x_pad = layout->btn->x_pad + max * pos;
layout->y_pad = layout->btn->y_pad + max * pos;
return true;
}
Animation *animation_pulse_create(gint64 duration)
{
// Note the 0 initialization
Animation *pulse = g_malloc0(sizeof(Animation));
pulse->type = ANIM_PULSE;
pulse->before_func = (DrawFunc)pulse_func;
pulse->duration = duration;
return pulse;
}
static bool shrink_func(Animation *shrink, Layout *layout)
{
g_assert_false(layout->btn->simple);
ButtonGroup *group = (gpointer)layout->btn;
gint64 end = shrink->start + shrink->duration;
gint64 now = g_get_monotonic_time();
if (now > end) {
// NOTE: Actually remove the buttons from the group after the animation's end
// This part is quite rough around the edges...
if (group->children->next) {
g_list_free(g_list_remove_link(group->children, group->children));
g_list_free_full(g_list_remove_link(layout->children, layout->children), (GDestroyNotify)layout_destroy);
layout->width = CAST(layout->children->data, Layout)->width;
return true;
}
return false;
}
double t = (double)(now - shrink->start) / (end - shrink->start);
double pos = smoothstep(t, 0, 1);
int target_w = CAST(layout->children->data, Layout)->width;
int width = layout->width - pos * (layout->width - target_w);
layout->width = width;
for (GList *it = layout->children, *next = it->next; it; it = next, next = it ? it->next : NULL) {
Layout *child = it->data;
if (child->x + child->width <= layout->x + width) continue;
layout_destroy(it->data);
layout->children = g_list_delete_link(layout->children, it);
}
return true;
}
Animation *animation_group_shrink_create(gint64 duration)
{
// Note the 0 initialization
Animation *shrink = g_malloc0(sizeof(Animation));
shrink->type = ANIM_GROUP_SHRINK;
shrink->layout_func = (LayoutFunc)shrink_func;
shrink->duration = duration;
return shrink;
}
static bool grow_func(Animation *grow, Layout *layout)
{
g_assert_false(layout->btn->simple);
ButtonGroup *group = (gpointer)layout->btn;
gint64 end = grow->start + grow->duration;
gint64 now = g_get_monotonic_time();
if (now > end) return false;
double t = (double)(now - grow->start) / (end - grow->start);
double pos = smoothstep(t, 0, 1);
int start_w = CAST(layout->children->data, Layout)->width;
int width = start_w + pos * (layout->width - start_w);
layout->width = width;
for (GList *it = layout->children->next, *next = it->next; it; it = next, next = it ? it->next : NULL) {
Layout *child = it->data;
if (child->x + child->width <= layout->x + width) continue;
layout_destroy(it->data);
layout->children = g_list_delete_link(layout->children, it);
}
return true;
}
Animation *animation_group_grow_create(gint64 duration)
{
// Note the 0 initialization
Animation *grow = g_malloc0(sizeof(Animation));
grow->type = ANIM_GROUP_GROW;
grow->layout_func = (LayoutFunc)grow_func;
grow->duration = duration;
return grow;
}
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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