3D 烟花 - three.js

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(function() {
  var Particles,
    bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

Particles = (function() {
    function Particles() {
      this.render = bind(this.render, this);
      this.rotateRadians = bind(this.rotateRadians, this);
      this.random = bind(this.random, this);
      this.mouseMove = bind(this.mouseMove, this);
      this.mouseDown = bind(this.mouseDown, this);
      this.resize = bind(this.resize, this);
      this.animate = bind(this.animate, this);
      this.setStage = bind(this.setStage, this);
      this.setLighting = bind(this.setLighting, this);
      this.getTexture = bind(this.getTexture, this);
      this.addStars = bind(this.addStars, this);
      this.setActors = bind(this.setActors, this);
      this.getPastelColor = bind(this.getPastelColor, this);
      this.canvasMouse = {
        x: 0,
        y: 0,
        z: 0,
        px: 0,
        py: 0,
        py: 0,
        vx: 0,
        vy: 0,
        pressed: false
      };
      this.colors = ['#da6b00', '#8555d4', '#4ad3b5', '#ffffff'];
      this.particleCount = 500;
      this.initialRadius = 0.1;
      this.movementSpeed = 2;
      this.directions = [];
      this.starSystems = [];
      this.systemCount = 1;
      this.setStage();
      this.setLighting();
      this.setActors();
      setInterval((function(_this) {
        return function() {
          _this.systemCount++;
          return _this.addStars(_this.getPastelColor(), 0, 0);
        };
      })(this), 5000);
      this.animate();
      this.render();
    }

Particles.prototype.getPastelColor = function() {
      this.col = new THREE.Color("hsl(" + (this.random(0, 360)) + ", " + (Math.floor(25 + 70 * Math.random())) + "%, " + (Math.floor(85 + 10 * Math.random())) + "%)");
      return "#" + (this.col.getHexString());
    };

Particles.prototype.setActors = function() {
      return this.addStars(this.getPastelColor(), 0, 0);
    };

Particles.prototype.addStars = function(color, x, y) {
      var angle, i, k, radiusSQ, ref, vertex;
      this.dirs = [];
      this.geometry = new THREE.Geometry();
      this.materials = new THREE.PointsMaterial({
        color: color,
        size: 1,
        transparent: true,
        blending: THREE.AdditiveBlending,
        map: this.getTexture(color),
        depthTest: false
      });
      for (i = k = 0, ref = this.particleCount; 0 <= ref ? k < ref : k > ref; i = 0 <= ref ? ++k : --k) {
        angle = Math.random() * 2 * Math.PI;
        radiusSQ = Math.random() * this.initialRadius * this.initialRadius;
        vertex = new THREE.Vector3();
        vertex.x = x;
        vertex.y = y;
        vertex.z = 0;
        this.dirs.push({
          x: (Math.random() * this.movementSpeed) - (this.movementSpeed / 2),
          y: (Math.random() * this.movementSpeed) - (this.movementSpeed / 2),
          z: (Math.random() * this.movementSpeed) - (this.movementSpeed / 2)
        });
        this.geometry.vertices.push(vertex);
      }
      this.starSystem = new THREE.Points(this.geometry, this.materials);
      this.starSystem.sortParticles = true;
      this.directions.push(this.dirs);
      this.starSystems.push(this.starSystem);
      return this.scene.add(this.starSystem);
    };

Particles.prototype.getTexture = function(color) {
      var canvas, context, gradient, texture;
      canvas = document.createElement('canvas');
      canvas.width = 32;
      canvas.height = 32;
      context = canvas.getContext('2d');
      gradient = context.createRadialGradient(canvas.width / 2, canvas.height / 2, 0, canvas.width / 2, canvas.height / 2, canvas.width / 2);
      gradient.addColorStop(0, 'rgba(255,255,255,1)');
      gradient.addColorStop(0.2, color);
      gradient.addColorStop(0.4, color);
      gradient.addColorStop(1, 'rgba(0,0,0,1)');
      context.fillStyle = gradient;
      context.fillRect(0, 0, canvas.width, canvas.height);
      texture = new THREE.Texture(canvas);
      texture.needsUpdate = true;
      return texture;
    };

Particles.prototype.setLighting = function() {
      this.ambientLight = new THREE.AmbientLight("#ffffff", 0.5);
      return this.scene.add(this.ambientLight);
    };

Particles.prototype.setStage = function() {
      this.renderer = new THREE.WebGLRenderer({
        canvas: document.getElementById("canvas"),
        antialias: true
      });
      this.renderer.setPixelRatio(window.devicePixelRatio);
      this.renderer.autoClear = false;
      this.renderer.setSize(window.innerWidth, window.innerHeight);
      this.scene = new THREE.Scene();
      this.camera = new THREE.PerspectiveCamera(45, window.innerWidth / window.innerHeight, 1, 1000);
      this.camera.position.z = 50;
      this.stats = new Stats();
      this.stats.setMode(0);
      this.stats.domElement.style.position = 'absolute';
      this.stats.domElement.style.left = '0px';
      this.stats.domElement.style.top = '0px';
      document.getElementById("stats").appendChild(this.stats.domElement);
      window.addEventListener('resize', this.resize, false);
      window.addEventListener('mousemove', this.mouseMove, false);
      return window.addEventListener("mousedown", this.mouseDown);
    };

Particles.prototype.animate = function() {
      var i, j, k, l, particle, ref, ref1;
      for (j = k = 0, ref = this.systemCount - 1; 0 <= ref ? k <= ref : k >= ref; j = 0 <= ref ? ++k : --k) {
        for (i = l = 0, ref1 = this.particleCount; 0 <= ref1 ? l < ref1 : l > ref1; i = 0 <= ref1 ? ++l : --l) {
          particle = this.starSystems[j].geometry.vertices[i];
          particle.x += this.directions[j][i].x;
          particle.y += this.directions[j][i].y;
          particle.z += this.directions[j][i].z;
        }
        this.starSystems[j].geometry.verticesNeedUpdate = true;
      }
      this.stats.update();
      this.render();
      return requestAnimationFrame(this.animate);
    };

Particles.prototype.resize = function() {
      this.camera.aspect = window.innerWidth / window.innerHeight;
      this.camera.updateProjectionMatrix();
      this.renderer.setSize(window.innerWidth, window.innerHeight);
      return this.render();
    };

Particles.prototype.mouseDown = function() {
      this.systemCount++;
      return this.addStars(this.getPastelColor(), this.canvasMouse.x, this.canvasMouse.y);
    };

Particles.prototype.mouseMove = function() {
      this.canvasMouse.px = this.canvasMouse.x;
      this.canvasMouse.py = this.canvasMouse.y;
      this.canvasX = (event.clientX / window.innerWidth) * 2 - 1;
      this.canvasY = -(event.clientY / window.innerHeight) * 2 + 1;
      this.vector = new THREE.Vector3(this.canvasX || 0, this.canvasY || 0, 0);
      this.vector.unproject(this.camera);
      this.dir = this.vector.sub(this.camera.position).normalize();
      this.distance = -this.camera.position.z / this.dir.z;
      return this.canvasMouse = this.camera.position.clone().add(this.dir.multiplyScalar(this.distance));
    };

Particles.prototype.random = function(min, max) {
      return Math.floor(Math.random() * max) + min;
    };

Particles.prototype.rotateRadians = function(deg) {
      return deg * (Math.PI / 180);
    };

Particles.prototype.render = function() {
      return this.renderer.render(this.scene, this.camera);
    };

return Particles;

})();

new Particles;

}).call(this);

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