88 lines
1.9 KiB
JavaScript
88 lines
1.9 KiB
JavaScript
import Body from './body.mjs';
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import {celestials, particles} from './index.mjs';
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export function createThrustExhaust(thruster) {
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let ship = thruster.ship;
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let [fx, fy] = ship.relativeVector(0, 0.2);
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let [dx, dy] = ship.relativeVector((Math.random() - 0.5) * 0.5, 0.5);
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let [cx, cy] = thruster.com;
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particles.add(new Particle(cx + dx, cy + dy, {
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xvel: ship.xvel + fx,
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yvel: ship.yvel + fy,
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color: '#f4c542',
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lifetime: 5,
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size: 0.07
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}));
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}
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export function createPickupBurst(ship, point) {
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for (let i = 0; i < 20; i++) {
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particles.add(new Particle(...point, {
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xvel: ship.xvel,
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yvel: ship.yvel,
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color: '#eae55d',
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lifetime: Math.random() * 20 + 15,
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friction: 0.95,
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size: Math.random() * 0.2 + 0.05,
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spray: 0.3
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}));
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}
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}
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export function createItemToss(ship) {
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particles.add(new Particle(...ship.com, {
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xvel: ship.xvel,
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yvel: ship.yvel,
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color: '#a87234',
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lifetime: 50,
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size: 0.6,
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spray: 0.4
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}));
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}
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class Particle extends Body {
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constructor(x, y, {
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xvel = 0,
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yvel = 0,
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spray = 0.1,
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fizzle = 0,
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maxFizzle = fizzle * 2,
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color = '#fff',
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gravity = false,
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lifetime = 50,
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size = 0.1,
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friction = 0.99
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}) {
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super(x, y, 0.1);
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this.size = size;
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this.xvel = xvel + (Math.random() - 0.5) * spray;
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this.yvel = yvel + (Math.random() - 0.5) * spray;
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this.friction = friction;
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this.fizzle = fizzle;
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this.maxFizzle = maxFizzle;
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this.color = color;
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this.gravity = gravity;
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this.life = lifetime;
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}
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get com() {
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return [this.x - this.size / 2, this.y - this.size / 2];
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}
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tick() {
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if (this.life-- <= 0) {
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particles.delete(this);
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return;
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}
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this.tickMotion();
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if (this.gravity) this.tickGravity(celestials);
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this.xvel *= this.friction;
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this.yvel *= this.friction;
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this.x += (Math.random() - 0.5) * this.fizzle;
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this.y += (Math.random() - 0.5) * this.fizzle;
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if (this.fizzle < this.mazFizzle) this.fizzle *= 1.05;
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}
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}
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