Fairy Dust Mouse Pointer

by vovkasolovev

HTML

<span class="fairy_dust"></span>

CSS

body{background:black;}
fairy_dust{position:absolute;overflow:hidden}

JavaScript

(function fairyDustCursor() {
  
  var possibleColors = ["#0077ff80", "#00117780"]
  var width = window.innerWidth;
  var height = window.innerHeight;
  var cursor = {x: width/2, y: width/2};
  var particles = [];
  
  function init() {
    bindEvents();
    loop();
  }
  
  // Bind events that are needed
  function bindEvents() {
    document.addEventListener('mousemove', onMouseMove);
    document.addEventListener('touchmove', onTouchMove);
    document.addEventListener('touchstart', onTouchMove);
    
    window.addEventListener('resize', onWindowResize);
  }
  
  function onWindowResize(e) {
    width = window.innerWidth;
    height = window.innerHeight;
  }
  
  function onTouchMove(e) {
    if( e.touches.length > 0 ) {
      for( var i = 0; i < e.touches.length; i++ ) {
        addParticle( e.touches[i].clientX, e.touches[i].clientY, possibleColors[Math.floor(Math.random()*possibleColors.length)]);
      }
    }
  }
  
  function onMouseMove(e) {    
    cursor.x = e.clientX;
    cursor.y = e.clientY;
    
    addParticle( cursor.x, cursor.y, possibleColors[Math.floor(Math.random()*possibleColors.length)]);
  }
  
  function addParticle(x, y, color) {
    var particle = new Particle();
    particle.init(x, y, color);
    particles.push(particle);
  }
  
  function updateParticles() {
    
    // Updated
    for( var i = 0; i < particles.length; i++ ) {
      particles[i].update();
    }
    
    // Remove dead particles
    for( var i = particles.length -1; i >= 0; i-- ) {
      if( particles[i].lifeSpan < 0 ) {
        particles[i].die();
        particles.splice(i, 1);
      }
    }
    
  }
  
  function loop() {
    requestAnimationFrame(loop);
    updateParticles();
  }
  
  /**
   * Particles
   */
  
  function Particle() {

    this.character = "·";
    this.lifeSpan = Math.random()*100+50; //ms
    this.initialStyles ={
      "position": "absolute",
      "display": "block",
      "pointerEvents": "none",
      "z-index": "10000000",
     ...