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#include <stdlib.h>
#include <stdio.h>
#include "../umath/vec.h"
#include "fxs.h"
#include "units.h"
void fx_init (fxs *fx) {
fx->bullets = (bullet*)malloc(sizeof(bullet)*1024);
fx->bulletslen = 0;
}
void fx_add_bullet (fxs *fx, bullet *b) {
fx->bullets[fx->bulletslen] = *b;
fx->bulletslen++;
}
void fx_process (fxs *fx, float time) {
for (int i=0; i<fx->bulletslen; i++) {
bullet *b = fx->bullets+i;
if (time > b->endtime) {
// remove by replacing with last, dont care for order
*b = fx->bullets[fx->bulletslen-1];
fx->bulletslen--;
}
}
}
void fx_render (SDL_Renderer *rend, fxs *fx, float cam[], float time) {
for (int i=0; i<fx->bulletslen; i++) {
bullet *b = fx->bullets+i;
float travel_time = b->endtime - b->starttime;
float interval_time = time - b->starttime;
float amt = interval_time / travel_time;
if (amt < 0) amt = 0; if (amt > 1) amt = 1;
float pos[2] = {
b->from[0] *(1-amt) + b->to[0] *amt,
b->from[1] *(1-amt) + b->to[1] *amt
};
float head[2]; vec2_sub(head, b->from, b->to);
float mag = 10;
float dist = amt*vec2_mag(head);
if (dist < 10) { mag = dist; }
vec2_norm(head); vec2_mul(head, head, mag);
SDL_SetRenderDrawColor(rend,
b->color[0],
b->color[1],
b->color[2],
255);
SDL_RenderDrawLine(rend,
-cam[0] + pos[0],
-cam[1] + pos[1],
-cam[0] + pos[0] + head[0],
-cam[1] + pos[1] + head[1]
);
}
}
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