added accidently-deleted particles.js file back

examples/particles.js

@@ -0,0 +1,148 @@
+(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);
+})();