Source: particles/particle_set.js

  1. /* 
  2.  * File: particle_set.js
  3.  * a set of Particles
  4.  * 
  5.  * Subclass of GameObjectSet: 
  6.  *     GameObjectSet: a set of objects that support: update() and draw() functions
  7.  *                     Particle satisfies!
  8.  */
  9. "use strict";
  11. import * as glSys from "../core/gl.js";
  12. import GameObjectSet from "../game_objects/game_object_set.js";
  13. import FlameEmitter from "./localized/flame_emitter.js";
  14. import ParticleEmitter from "./particle_emitter.js";
  15. import RainEmitter from "./ambient/rain_emitter.js";
  16. import SnowEmitter from "./ambient/snow_emitter.js";
  17. import DustEmitter from "./ambient/dust_emitter.js";
  18. import BurstEmitter from "./localized/burst_emitter.js";
  19. import ElectricityEmitter from "./localized/electricity_emitter.js";
  21. /**
  22.  * @constructor ParticleSet
  23.  */
  24. class ParticleSet extends GameObjectSet {
  25.     constructor() {
  26.         super();
  27.         this.mEmitterSet = [];
  28.     }
  29.     /**
  30.      * @function draw() - Draws to the given camera.
  31.      * @param {Camera} aCamera - The camera to draw to
  32.      */
  33.     draw(aCamera) {
  34.         let gl = glSys.get();
  35.         gl.blendFunc(gl.ONE, gl.ONE);  // for additive blending!
  36.         super.draw(aCamera);
  37.         gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA); // restore alpha blending
  38.     }
  39.     /**
  40.      * @function addEmitterAt() - Adds a default emitter to the given position
  41.      * @param {float} x - The x coordinate of the emitter position
  42.      * @param {float} y - The y coordinate of the emitter position
  43.      * @param {int} n - The number of particles to create in the emitter
  44.      * @returns {ParticleEmitter} e - The newly added default emitter
  45.      */
  46.     addEmitterAt(x, y, n) {
  47.         let e = new ParticleEmitter(x, y, n);
  48.         this.mEmitterSet.push(e);
  49.         return e;
  50.     }
  51.     /**
  52.      * @function addFlameAt() - Adds a new flame emitter to the given position
  53.      * @param {float} x - The x coordinate of the emitter position
  54.      * @param {float} y - The y coordinate of the emitter position
  55.      * @param {int} n - The number of particles to create in the emitter
  56.      * @param {float} life - The lifespan of the emitter
  57.      * @returns {FlameEmitter} e - The newly added flame emitter
  58.      */
  59.     addFlameAt(x,y,n,life) {
  60.         let e = new FlameEmitter(x, y, n, life);
  61.         this.mEmitterSet.push(e);
  62.         return e;
  63.     }
  64.     /**
  65.      * @function addRain() - Creates a new rain emitter
  66.      * @param {int} n - The number of particles to emit
  67.      * @param {float} life - The lifespan of the emitter
  68.      * @returns {RainEmitter} e - The newly added rain emitter
  69.      */
  70.     addRain(n,life) {
  71.         let e = new RainEmitter(n, life);
  72.         this.mEmitterSet.push(e);
  73.         return e;
  74.     }
  75.     /**
  76.      * @function addSnow() - Creates a new snow emitter
  77.      * @param {int} n - The number of particles to emit
  78.      * @param {float} life - The lifespan of the emitter
  79.      * @returns {SnowEmitter} e - The newly added snow emitter
  80.      */
  81.     addSnow(n,life) {
  82.         let e = new SnowEmitter(n, life);
  83.         this.mEmitterSet.push(e);
  84.         return e;
  85.     }
  86.     /**
  87.      * @function addDust() - Creates a new dust emitter
  88.      * @param {int} n - The number of particles to emit
  89.      * @param {float} life - The lifespan of the emitter
  90.      * @returns {DustEmitter} e - The newly added dust emitter
  91.      */
  92.     addDust(n,life) {
  93.         let e = new DustEmitter(n, life);
  94.         this.mEmitterSet.push(e);
  95.         return e;
  96.     }
  97.     /**
  98.      * @function addBurstAt() - Adds a new burst emitter at the given position
  99.      * @param {float} x - The x coordinate of the emitter position
  100.      * @param {float} y - The y coordinate of the emitter position
  101.      * @param {int} n - The number of particles to create in the emitter
  102.      * @returns {BurstEmitter} e - The newly created burst emitter
  103.      */
  104.     addBurstAt(x,y,n) {
  105.         let e = new BurstEmitter(x, y, n);
  106.         this.mEmitterSet.push(e);
  107.         return e;
  108.     }
  109.     /**
  110.      * @function addElectricityAt() - Adds a new electric emitter at the given position
  111.      * @param {float} x - The x coordinate of the emitter position
  112.      * @param {float} y - The y coordinate of the emitter position
  113.      * @param {int} n - The number of particles to create in the emitter
  114.      * @returns {ElectricityEmitter} e - The newly created electric emitter
  115.      */
  116.     addElectricityAt(x,y,n) {
  117.         let e = new ElectricityEmitter(x, y, n);
  118.         this.mEmitterSet.push(e);
  119.         return e;
  120.     }
  122.     drawMarkers(aCamera) {
  123.         let i;
  124.         for (i = 0; i < this.mSet.length; i++) {
  125.             this.mSet[i].drawMarker(aCamera);
  126.         }
  127.     }
  129.     /**
  130.      * @function update() - Cleans up and emits particles in the set
  131.      */
  132.     update() {
  133.         super.update();
  134.         // Cleanup Particles
  135.         let i, obj;
  136.         for (i = 0; i < this.size(); i++) {
  137.             obj = this.getObjectAt(i);
  138.             if (obj.hasExpired()) {
  139.                 this.removeFromSet(obj);
  140.             }
  141.         }
  143.         // Emit new particles
  144.         for (i = 0; i < this.mEmitterSet.length; i++) {
  145.             let e = this.mEmitterSet[i];
  146.             e.emitParticles(this);
  147.             if (e.expired()) {  // delete the emitter when done
  148.                 this.mEmitterSet.splice(i, 1);
  149.             }
  150.         }
  151.     }
  152. }
  154. export default ParticleSet;