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#include <math.h>
#include "effect.h"
#include "any_log.h"
double cubic_bezier(double x, double a, double b, double c, double d)
{
const double t = 1 - x;
return a * (t * t * t) + 3 * b * (t * t * x) + 3 * c * (t * x * x) + d * (x * x * x);
}
static void effect_pulse_pre(effect_t *effect, layout_t *layout, cairo_t *cr)
{
struct timespec now;
timespec_get(&now, TIME_UTC);
// After half the duration we invert direction
struct timespec midpoint = timespec_div(effect->duration, 2);
struct timespec diff = timespec_diff(now, effect->start);
double t = timespec_greater(midpoint, diff)
? (double)timespec_to_ms(diff) / timespec_to_ms(midpoint)
: 1.0 - (double)timespec_to_ms(timespec_diff(diff, midpoint)) / timespec_to_ms(midpoint);
// Make it customizable
double s = cubic_bezier(t, 0.19, 1.0, 0.22, 1.0);
// Make it a parameter
const double amplitude = 0.12;
// FIXME: The intent was to scale the animation for long blocks, but it needs more love
//
int x_max = amplitude * (layout->height + (layout->width / (double)layout->height) - 1);
int y_max = amplitude * layout->height;
layout->x_padding = layout->block->x_padding + x_max * s;
layout->y_padding = layout->block->y_padding + y_max * s;
}
effect_t *effect_pulse(struct timespec duration)
{
effect_t *effect = calloc(1, sizeof(effect_t));
effect->type = EFFECT_PULSE;
effect->duration = duration;
effect->pre = effect_pulse_pre;
return effect;
}
void effect_free(effect_t *effect)
{
free(effect);
}
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