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#include <stdlib.h>
#include <math.h>
#include "eve_platform.h"
#include "eve_phy.h"
/* Constant accelerator */
void eve_phy_acc_init(EVEPhyAcc *param, int a) {
param->a = a;
}
void eve_phy_acc_start(EVEPhyAcc *param, int x0, int y0, int v0x, int v0y) {
double v0 = sqrt(v0x * v0x + v0y * v0y);
param->x0 = x0;
param->y0 = y0;
param->v0x = v0x;
param->v0y = v0y;
param->k = 2 * v0 / param->a * EVE_RTC_FREQ;
}
int eve_phy_acc_tick(EVEPhyAcc *param, int dt, int *x, int *y) {
int k = param->k;
int x0 = param->x0;
int y0 = param->y0;
int v0x = param->v0x;
int v0y = param->v0y;
int more = 1;
if ((k < 0) && (dt >= -k / 2)) {
dt = -k / 2;
more = 0;
}
if (x) *x = x0 + (v0x * dt + v0x * dt / k * dt) / (int)(EVE_RTC_FREQ);
if (y) *y = y0 + (v0y * dt + v0y * dt / k * dt) / (int)(EVE_RTC_FREQ);
return more;
}
/* Linear harmonic oscillator */
void eve_phy_lho_init(EVEPhyLHO *param, 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;
param->x = x;
param->y = y;
param->f = f0 * sqrt(1 - d * d);
param->a = -d * f0;
param->t_max = t_max * EVE_RTC_FREQ / 1000;
}
int eve_phy_lho_start(EVEPhyLHO *param, int x0, int y0) {
param->x0 = x0;
param->y0 = y0;
}
int eve_phy_lho_tick(EVEPhyLHO *param, int dt, int *x, int *y) {
int ax = param->x0 - param->x;
int ay = param->y0 - param->y;
int more = 1;
if (param->t_max && (dt >= param->t_max)) {
dt = param->t_max;
more = 0;
}
if (param->a) {
double e = exp(param->a * dt);
ax = ax * e;
ay = ay * e;
if ((ax == 0) && (ay == 0)) more = 0;
}
if (x) *x = param->x + ax * cos(param->f * dt);
if (y) *y = param->y + ay * cos(param->f * dt);
return more;
}
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