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#include <stdlib.h>
#include <math.h>
#include "eve.h"
void eve_track_init(void) {
eve_etrack_set(eve_track_inert_init, eve_track_inert_tick, NULL, NULL);
}
void eve_track_set(uint8_t type, void *param) {
switch (type) {
case EVE_TRACK_TYPE_INERT:
eve_etrack_set(eve_track_inert_init, eve_track_inert_tick, NULL, NULL);
break;
case EVE_TRACK_TYPE_OSC:
eve_etrack_set(NULL, eve_track_osc_tick, NULL, param);
break;
default:
break;
}
}
void eve_track_inert_init(EVETouchTimer *timer, EVETouch *touch) {
double d = sqrt(touch->vx * touch->vx + touch->vy * touch->vy);
int fc = (double)(EVE_RTC_FREQ) * d / EVE_TRACK_FRICTION;
timer->p = (void *)fc;
}
int eve_track_inert_tick(EVETouchTimer *timer, EVETouch *touch) {
int dt = eve_time_get_tick() - touch->t;
int fc = (int)timer->p;
int more = 1;
if (dt >= fc / 2) {
dt = fc / 2;
more = 0;
}
touch->x = timer->x0 + (touch->vx * dt - touch->vx * dt / fc * dt) / (int)(EVE_RTC_FREQ);
touch->y = timer->y0 + (touch->vy * dt - touch->vy * dt / fc * dt) / (int)(EVE_RTC_FREQ);
return more;
}
void eve_track_osc_init(EVETrackOsc *p, int x, int y, uint32_t T, double d, uint32_t t_max) {
double f0 = 2 * M_PI / (T * EVE_RTC_FREQ / 1000);
if (d < 0) d = 0;
if (d > 1) d = 1;
p->x = x;
p->y = y;
p->f = d ? f0 * sqrt(1 - d * d) : f0;
p->d = d;
p->a = -d * f0;
p->t_max = t_max;
}
int eve_track_osc_tick(EVETouchTimer *timer, EVETouch *touch) {
EVETrackOsc *p = (EVETrackOsc *)timer->p;
int dt = eve_time_get_tick() - touch->t;
int ax = timer->x0 - p->x;
int ay = timer->y0 - p->y;
int more = 1;
if (p->t_max && (dt >= p->t_max)) {
dt = p->t_max;
more = 0;
}
if (p->d) {
double e = exp(p->a * dt);
ax = ax * e;
ay = ay * e;
if ((ax == 0) && (ay == 0)) more = 0;
}
touch->x = p->x + ax * cos(p->f * dt);
touch->y = p->y + ay * cos(p->f * dt);
return more;
}
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