content/hifi-public/scripts/particles.js

(function() {
    var spawnPoint = Vec3.sum(MyAvatar.position, Vec3.multiply(3, Quat.getFront(Camera.getOrientation())));

    // constructor

    function TestBox() {
        this.entity = Entities.addEntity({
            type: "Box",
            position: spawnPoint,
            dimentions: {
                x: 1,
                y: 1,
                z: 1
            },
            color: {
                red: 100,
                green: 100,
                blue: 255
            },
            gravity: {
                x: 0,
                y: 0,
                z: 0
            },
            visible: true,
            locked: false,
            lifetime: 6000
        });
        var self = this;
        this.timer = Script.setInterval(function() {
            var colorProp = {
                color: {
                    red: Math.random() * 255,
                    green: Math.random() * 255,
                    blue: Math.random() * 255
                }
            };
            Entities.editEntity(self.entity, colorProp);
        }, 1000);
    }

    TestBox.prototype.Destroy = function() {
        Script.clearInterval(this.timer);
        Entities.editEntity(this.entity, {
            locked: false
        });
        Entities.deleteEntity(this.entity);
    }

    // constructor

    function TestFx(color, emitDirection, emitRate, emitStrength, blinkRate) {
        var PI = 3.141593;
        var DEG_TO_RAD = PI / 180.0;

        this.entity = Entities.addEntity({
            type: "ParticleEffect",
            isEmitting: true,
            position: spawnPoint,
            dimensions: {
                x: 2,
                y: 2,
                z: 2
            },
            emitSpeed: 0.05,
            maxParticles: 2,
            speedSpread: 2,
            polarFinish: 30 * DEG_TO_RAD,
            emitAcceleration: {
                x: 0,
                y: -9.8,
                z: 0
            },
            textures: "https://hifi-public.s3.amazonaws.com/alan/Particles/Particle-Sprite-Smoke-1.png",
            color: color,
            lifespan: 1.0,
            visible: true,
            locked: false
        });

        this.isPlaying = true;

        var self = this;
        this.timer = Script.setInterval(function() {
            // flip is playing state
            self.isPlaying = !self.isPlaying;
            var emittingProp = {
                isEmitting: self.isPlaying
            };
            Entities.editEntity(self.entity, emittingProp);
        }, (1 / blinkRate) * 1000);
    }

    TestFx.prototype.Destroy = function() {
        Script.clearInterval(this.timer);
        Entities.editEntity(this.entity, {
            locked: false
        });
        Entities.deleteEntity(this.entity);
    }

    var objs = [];

    function Init() {
        objs.push(new TestBox());
        objs.push(new TestFx({
                red: 255,
                green: 0,
                blue: 0
            }, {
                x: 0.5,
                y: 1.0,
                z: 0.0
            },
            100, 3, 1));
        objs.push(new TestFx({
                red: 0,
                green: 255,
                blue: 0
            }, {
                x: 0,
                y: 1,
                z: 0
            },
            1000, 5, 0.5));
        objs.push(new TestFx({
                red: 0,
                green: 0,
                blue: 255
            }, {
                x: -0.5,
                y: 1,
                z: 0
            },
            100, 3, 1));
    }

    function ShutDown() {
        var i, len = objs.length;
        for (i = 0; i < len; i++) {
            objs[i].Destroy();
        }
        objs = [];
    }

    Init();
    Script.scriptEnding.connect(ShutDown);
})();