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/*!

• Fairy Dust Cursor.js
• • 90's cursors collection
• -- https://github.com/tholman/90s-cursor-effects
• -- http://codepen.io/tholman/full/jWmZxZ/
  */

//鼠标点击雪花特效
(function fairyDustCursor() {

var possibleColors = ["#D61C59", "#E7D84B", "#1B8798"]
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 = "霞";//设置显示字体
this.lifeSpan = 120; //ms
this.initialStyles ={
  "position": "fixed",
  "top": "0", //必须加
  "display": "block",
  "pointerEvents": "none",
  "z-index": "10000000",
  "fontSize": "10px",
  "will-change": "transform"
};//20

// Init, and set properties
this.init = function(x, y, color) {

  this.velocity = {
    x:  (Math.random() < 0.5 ? -1 : 1) * (Math.random() / 2),
    y: 1
  };
  
  this.position = {x: x - 10, y: y - 20};
  this.initialStyles.color = color;
  console.log(color);

  this.element = document.createElement('span');
  this.element.innerHTML = this.character;
  applyProperties(this.element, this.initialStyles);
  this.update();
  
  document.body.appendChild(this.element);
};

this.update = function() {
  this.position.x += this.velocity.x;
  this.position.y += this.velocity.y;
  this.lifeSpan--;
  
  this.element.style.transform = "translate3d(" + this.position.x + "px," + this.position.y + "px,0) scale(" + (this.lifeSpan / 120) + ")";
}

this.die = function() {
  this.element.parentNode.removeChild(this.element);
}

/**

• Utils
  */

// Applies css properties to an element.
function applyProperties( target, properties ) {
for( var key in properties ) {
target.style[ key ] = properties[ key ];
}
}

init();
})();****