117 lines
2.4 KiB
JavaScript
117 lines
2.4 KiB
JavaScript
var Color = use('color')
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var ex = {}
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var emitter = {};
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emitter.life = 10;
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emitter.scale = 1;
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emitter.grow_for = 0;
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emitter.spawn_timer = 0;
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emitter.pps = 0;
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emitter.color = Color.white;
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emitter.kill = function () {
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emitters.remove(this);
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};
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var std_step = function (p) {
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if (p.time < this.grow_for) {
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var s = Math.lerp(0, this.scale, p.time / this.grow_for);
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p.transform.scale = s;
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} else if (p.time > p.life - this.shrink_for) {
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var s = Math.lerp(0, this.scale, (p.life - p.time) / this.shrink_for);
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p.transform.scale = s;
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} else p.transform.scale = [this.scale, this.scale, this.scale];
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};
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emitter.step_hook = std_step;
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emitter.spawn = function (t) {
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t ??= this.transform;
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var par = this.dead.shift();
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if (par) {
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par.transform.unit();
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par.transform.pos = t.pos;
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par.transform.scale = this.scale;
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this.particles.push(par);
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par.time = 0;
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this.spawn_hook?.(par);
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par.life = this.life;
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return;
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}
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par = {
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transform: os.make_transform(),
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life: this.life,
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time: 0,
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color: this.color,
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body:{},
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};
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par.transform.scale = this.scale;
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this.particles.push(par);
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this.spawn_hook(par);
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};
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emitter.step = function step(dt) {
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// update spawning particles
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if (this.on && this.pps > 0) {
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this.spawn_timer += dt;
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var pp = 1 / this.pps;
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while (this.spawn_timer > pp) {
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this.spawn_timer -= pp;
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this.spawn();
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}
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}
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// update all particles
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for (var p of this.particles) {
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p.time += dt;
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p.transform.move(p.body.velocity?.scale(dt));
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this.step_hook?.(p);
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if (this.kill_hook?.(p) || p.time >= p.life) {
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this.die_hook?.(p);
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this.dead.push(p);
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this.particles.remove(p);
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}
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}
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// for (var p of this.particles)
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// p.transform.clean();
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};
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emitter.burst = function (count, t) {
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for (var i = 0; i < count; i++) this.spawn(t);
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};
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var emitters = [];
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ex.make = function make_emitter() {
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var e = Object.create(emitter);
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e.particles = [];
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e.dead = [];
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emitters.push(e);
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return e;
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};
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ex.update = function update_emitters(dt) {
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for (var e of emitters) e.step(dt);
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}
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ex.stat = function stat_emitters()
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{
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var stat = {};
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stat.emitters = emitters.length;
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var particles = 0;
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for (var e of emitters) particles += e.particles.length;
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stat.particles = particles;
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return stat;
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}
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ex.all = function all_emitters() { return emitters; }
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return ex
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