the-world-engine/dist/esm/box2d.ts/build/particle/b2_particle.js

three.js based, unity like game engine for browser

import { b2_invalidParticleIndex } from "../common/b2_settings.js";

import { b2Clamp, b2Vec2 } from "../common/b2_math.js";

import { b2Color } from "../common/b2_draw.js";

export var b2ParticleFlag;

(function(t) {
    t[t["b2_waterParticle"] = 0] = "b2_waterParticle";
    t[t["b2_zombieParticle"] = 2] = "b2_zombieParticle";
    t[t["b2_wallParticle"] = 4] = "b2_wallParticle";
    t[t["b2_springParticle"] = 8] = "b2_springParticle";
    t[t["b2_elasticParticle"] = 16] = "b2_elasticParticle";
    t[t["b2_viscousParticle"] = 32] = "b2_viscousParticle";
    t[t["b2_powderParticle"] = 64] = "b2_powderParticle";
    t[t["b2_tensileParticle"] = 128] = "b2_tensileParticle";
    t[t["b2_colorMixingParticle"] = 256] = "b2_colorMixingParticle";
    t[t["b2_destructionListenerParticle"] = 512] = "b2_destructionListenerParticle";
    t[t["b2_barrierParticle"] = 1024] = "b2_barrierParticle";
    t[t["b2_staticPressureParticle"] = 2048] = "b2_staticPressureParticle";
    t[t["b2_reactiveParticle"] = 4096] = "b2_reactiveParticle";
    t[t["b2_repulsiveParticle"] = 8192] = "b2_repulsiveParticle";
    t[t["b2_fixtureContactListenerParticle"] = 16384] = "b2_fixtureContactListenerParticle";
    t[t["b2_particleContactListenerParticle"] = 32768] = "b2_particleContactListenerParticle";
    t[t["b2_fixtureContactFilterParticle"] = 65536] = "b2_fixtureContactFilterParticle";
    t[t["b2_particleContactFilterParticle"] = 131072] = "b2_particleContactFilterParticle";
})(b2ParticleFlag || (b2ParticleFlag = {}));

export class b2ParticleDef {
    constructor() {
        this.flags = 0;
        this.position = new b2Vec2;
        this.velocity = new b2Vec2;
        this.color = new b2Color(0, 0, 0, 0);
        this.lifetime = 0;
        this.userData = null;
        this.group = null;
    }
}

export function b2CalculateParticleIterations(t, e, r) {
    const i = 8;
    const a = .01;
    const c = Math.ceil(Math.sqrt(t / (a * e)) * r);
    return b2Clamp(c, 1, i);
}

export class b2ParticleHandle {
    constructor() {
        this.m_index = b2_invalidParticleIndex;
    }
    GetIndex() {
        return this.m_index;
    }
    SetIndex(t) {
        this.m_index = t;
    }
}