动态爱心--HTML源码

时间：2025-02-25 18:18:42
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
  <style>
  html, body {
  height: 100%;
  padding: 0;
  margin: 0;
  background: #000;
}
canvas {
  position: absolute;
  width: 100%;
  height: 100%;
}
  </style>
 </HEAD>
 
 <BODY>
  <canvas ></canvas>
  <script>
  /*
 * Settings
 */
var settings = {
  particles: {
    length:   500, // maximum amount of particles
    duration:   2, // particle duration in sec
    velocity: 100, // particle velocity in pixels/sec
    effect: -0.75, // play with this for a nice effect
    size:      30, // particle size in pixels
  },
};
 
/*
 * RequestAnimationFrame polyfill by Erik Möller
 */
(function(){var b=0;var c=["ms","moz","webkit","o"];for(var a=0;a<&&!;++a){=window[c[a]+"RequestAnimationFrame"];=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!){=function(h,e){var d=new Date().getTime();var f=(0,16-(d-b));var g=(function(){h(d+f)},f);b=d+f;return g}}if(!){=function(d){clearTimeout(d)}}}());
 
/*
 * Point class
 */
var Point = (function() {
  function Point(x, y) {
    = (typeof x !== 'undefined') ? x : 0;
    = (typeof y !== 'undefined') ? y : 0;
  }
  = function() {
    return new Point(, );
  };
  = function(length) {
    if (typeof length == 'undefined')
      return ( * + * );
    ();
    *= length;
    *= length;
    return this;
  };
  = function() {
    var length = ();
    /= length;
    /= length;
    return this;
  };
  return Point;
})();
 
/*
 * Particle class
 */
var Particle = (function() {
  function Particle() {
    = new Point();
    = new Point();
    = new Point();
    = 0;
  }
  = function(x, y, dx, dy) {
    = x;
    = y;
    = dx;
    = dy;
    = dx * ;
    = dy * ;
    = 0;
  };
  = function(deltaTime) {
    += * deltaTime;
    += * deltaTime;
    += * deltaTime;
    += * deltaTime;
    += deltaTime;
  };
  = function(context, image) {
    function ease(t) {
      return (--t) * t * t + 1;
    }
    var size = * ease( / );
    = 1 - / ;
    (image, - size / 2, - size / 2, size, size);
  };
  return Particle;
})();
 
/*
 * ParticlePool class
 */
var ParticlePool = (function() {
  var particles,
      firstActive = 0,
      firstFree   = 0,
      duration    = ;
   
  function ParticlePool(length) {
    // create and populate particle pool
    particles = new Array(length);
    for (var i = 0; i < ; i++)
      particles[i] = new Particle();
  }
  = function(x, y, dx, dy) {
    particles[firstFree].initialize(x, y, dx, dy);
     
    // handle circular queue
    firstFree++;
    if (firstFree   == ) firstFree   = 0;
    if (firstActive == firstFree       ) firstActive++;
    if (firstActive == ) firstActive = 0;
  };
  = function(deltaTime) {
    var i;
     
    // update active particles
    if (firstActive < firstFree) {
      for (i = firstActive; i < firstFree; i++)
        particles[i].update(deltaTime);
    }
    if (firstFree < firstActive) {
      for (i = firstActive; i < ; i++)
        particles[i].update(deltaTime);
      for (i = 0; i < firstFree; i++)
        particles[i].update(deltaTime);
    }
     
    // remove inactive particles
    while (particles[firstActive].age >= duration && firstActive != firstFree) {
      firstActive++;
      if (firstActive == ) firstActive = 0;
    }
     
     
  };
  = function(context, image) {
    // draw active particles
    if (firstActive < firstFree) {
      for (i = firstActive; i < firstFree; i++)
        particles[i].draw(context, image);
    }
    if (firstFree < firstActive) {
      for (i = firstActive; i < ; i++)
        particles[i].draw(context, image);
      for (i = 0; i < firstFree; i++)
        particles[i].draw(context, image);
    }
  };
  return ParticlePool;
})();
 
/*
 * Putting it all together
 */
(function(canvas) {
  var context = ('2d'),
      particles = new ParticlePool(),
      particleRate = / , // particles/sec
      time;
   
  // get point on heart with -PI <= t <= PI
  function pointOnHeart(t) {
    return new Point(
      160 * ((t), 3),
      130 * (t) - 50 * (2 * t) - 20 * (3 * t) - 10 * (4 * t) + 25
    );
  }
   
  // creating the particle image using a dummy canvas
  var image = (function() {
    var canvas  = ('canvas'),
        context = ('2d');
     = ;
    = ;
    // helper function to create the path
    function to(t) {
      var point = pointOnHeart(t);
      = / 2 + * / 350;
      = / 2 - * / 350;
      return point;
    }
    // create the path
    ();
    var t = -;
    var point = to(t);
    (, );
    while (t < ) {
      t += 0.01; // baby steps!
      point = to(t);
      (, );
    }
    ();
    // create the fill
    = '#ea80b0';
    ();
    // create the image
    var image = new Image();
    = ();
    return image;
  })();
   
  // render that thing!
  function render() {
    // next animation frame
    requestAnimationFrame(render);
     
    // update time
    var newTime   = new Date().getTime() / 1000,
        deltaTime = newTime - (time || newTime);
    time = newTime;
     
    // clear canvas
    (0, 0, , );
     
    // create new particles
    var amount = particleRate * deltaTime;
    for (var i = 0; i < amount; i++) {
      var pos = pointOnHeart( - 2 * * ());
      var dir = ().length();
      ( / 2 + , / 2 - , , -);
    }
     
    // update and draw particles
    (deltaTime);
    (context, image);
  }
   
  // handle (re-)sizing of the canvas
  function onResize() {
     = ;
    = ;
  }
  = onResize;
   
  // delay rendering bootstrap
  setTimeout(function() {
    onResize();
    render();
  }, 10);
})(('pinkboard'));
  </script>
 </BODY>
</HTML>

相关文章