情人节快乐 - 爱心

            
            body {
  margin: 0;
  padding: 0;
  background: white;
}

#myCanvas {
  display: block;
}
        

            
            window.requestAnimFrame = (function () {
 return  window.requestAnimationFrame ||
  window.webkitRequestAnimationFrame ||
  window.mozRequestAnimationFrame ||
  window.oRequestAnimationFrame ||
  window.msRequestAnimationFrame ||
  function (callback) {
   window.setTimeout(callback, 1000 / 60);
  };
})();


/*
 * basic stuff
 */
var FX = {
  config : {
    background  : 'rgba(250,250,250,0.2)',
    color   : 'rgb(250,20,75)',
    highlight : 'rgb(250,20,20)'
  },
  dots : []
};

FX.canvas = document.getElementById('myLove');
FX.ctx = FX.canvas.getContext('2d');


/*
 * Extend Math Object
 */ 
Math.TO_RAD = Math.PI/180;

Math.getDistance = function( x1, y1, x2, y2 ) {
  
  var   xs = 0,
    ys = 0;
   
  xs = x1 - x2;
  ys = y1 - y2;   
  xs = xs * xs;
  ys = ys * ys;
   
  return Math.sqrt( xs + ys );
};

Math.getDegree = function( x1, y1, x2, y2 ) {
    
  var dx = x2 - x1,
    dy = y2 - y1;
  
  return Math.atan2(dy,dx) / Math.TO_RAD;
};



/*
 * Dot Object
 */
var Dot = function( opts ) {

  this.color = opts.color;

  this.x = 0;
  this.y = 0;
  this.dest_x = (opts.dest_x - 75);
  this.dest_y = (opts.dest_y - 75);
};

Dot.prototype.update = function() {

  var   d = this,
    dist_x = d.dest_x - d.x,
    dist_y = d.dest_y - d.y;

  d.x += dist_x * 0.05;
  d.y += dist_y * 0.05;

  FX.ctx.fillStyle = d.color;
  FX.ctx.fillRect( d.x-2, d.y-2, 4, 4 );
};



/*
 * full screen canvas
 */
FX.setFullscreen = function() {
  FX.width = FX.canvas.width = window.innerWidth;
  FX.height = FX.canvas.height = window.innerHeight;
};

/*
 * Mouse
 */
FX.handleMouseEvent = function(e, power) {

  var   radius = 75,
    k = FX.dots.length,
    i=0,
    mx, my, 
    dist, degree,
    d;

  if(e.offsetX) {
    mx = e.offsetX;
    my = e.offsetY;
  } else if(e.layerX) {
    mx = e.layerX;
    my = e.layerY;
  }

  mx -= FX.width/2;
  my -= FX.height/2;

  for( ;i<k;i=i+1 ) {

    d = FX.dots[i];

    dist = Math.getDistance( mx, my, d.x, d.y);   

    if( dist < radius ) {

      degree = Math.getDegree( d.x, d.y, mx, my );

      d.x += (Math.cos( degree * Math.TO_RAD ) * ((radius-dist) * power));
      d.y += (Math.sin( degree * Math.TO_RAD ) * ((radius-dist) * power));

      d.color = FX.config.highlight;

    } else {
      d.color = FX.config.color;
    }
  }
};

/*
 * create the heart
 */
FX.createHeart = function() {
  var   coords = [[1,4],[1,5],[1,6],[1,7],[1,8],[2,3],[2,4],[2,5],[2,6],[2,7],[2,8],[2,9],[3,2],[3,3],[3,4],[3,5],[3,6],[3,7],[3,8],[3,9],[3,10],[4,2],[4,3],[4,4],[4,5],[4,6],[4,7],[4,8],[4,9],[4,10],[4,11],[5,2],[5,3],[5,4],[5,5],[5,6],[5,7],[5,8],[5,9],[5,10],[5,11],[6,2],[6,3],[6,4],[6,5],[6,6],[6,7],[6,8],[6,9],[6,10],[6,11],[6,12],[7,3],[7,4],[7,5],[7,6],[7,7],[7,8],[7,9],[7,10],[7,11],[7,12],[8,3],[8,4],[8,5],[8,6],[8,7],[8,8],[8,9],[8,10],[8,11],[8,12],[8,13],[9,2],[9,3],[9,4],[9,5],[9,6],[9,7],[9,8],[9,9],[9,10],[9,11],[9,12],[10,2],[10,3],[10,4],[10,5],[10,6],[10,7],[10,8],[10,9],[10,10],[10,11],[11,2],[11,3],[11,4],[11,5],[11,6],[11,7],[11,8],[11,9],[11,10],[11,11],[12,2],[12,3],[12,4],[12,5],[12,6],[12,7],[12,8],[12,9],[12,10],[13,3],[13,4],[13,5],[13,6],[13,7],[13,8],[13,9],[14,4],[14,5],[14,6],[14,7],[14,8]],
    k = coords.length,
    raster = 10,
    i = 0;

  for( ;i<k;i=i+1 ) {
    FX.dots.push( new Dot({
      dest_x : coords[i][0] * raster,
      dest_y : coords[i][1] * raster,
      color: FX.config.color
    }) );
  }
};

/*
 * main loop
 */
FX.loop = function() {

  var   ctx = FX.ctx,
    k = FX.dots.length,
    i = 0;

  ctx.fillStyle = FX.config.background;
  ctx.fillRect(0,0, FX.width, FX.height );


  ctx.save();
  ctx.translate( FX.width/2, FX.height/2 );

  for( ;i<k;i=i+1 ) {
    FX.dots[i].update();
  }

  ctx.restore();
  
  requestAnimFrame( FX.loop );
};

/*
 * Event bindings
 */
window.addEventListener('resize', FX.setFullscreen );
FX.canvas.addEventListener('mousemove', function(e) { FX.handleMouseEvent(e, -0.1); } );
FX.canvas.addEventListener('mousedown', function(e) { FX.handleMouseEvent(e, 1); } );


/*
 * Init
 */
FX.setFullscreen();
FX.createHeart();
FX.loop();



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