Code Trái Tim

mail@pastecode.io avatar
unknown
plain_text
2 years ago
8.6 kB
1
Indexable
Never
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">

<HTML>

 <HEAD>

  <TITLE>XAM LOZ VCL AE OI</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 id="pinkboard"></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<c.length&&!window.requestAnimationFrame;++a){window.requestAnimationFrame=window[c[a]+"RequestAnimationFrame"];window.cancelAnimationFrame=window[c[a]+"CancelAnimationFrame"]||window[c[a]+"CancelRequestAnimationFrame"]}if(!window.requestAnimationFrame){window.requestAnimationFrame=function(h,e){var d=new Date().getTime();var f=Math.max(0,16-(d-b));var g=window.setTimeout(function(){h(d+f)},f);b=d+f;return g}}if(!window.cancelAnimationFrame){window.cancelAnimationFrame=function(d){clearTimeout(d)}}}());


/*

 * Point class

 */

var Point = (function() {

  function Point(x, y) {

    this.x = (typeof x !== 'undefined') ? x : 0;

    this.y = (typeof y !== 'undefined') ? y : 0;

  }

  Point.prototype.clone = function() {

    return new Point(this.x, this.y);

  };

  Point.prototype.length = function(length) {

    if (typeof length == 'undefined')

      return Math.sqrt(this.x * this.x + this.y * this.y);

    this.normalize();

    this.x *= length;

    this.y *= length;

    return this;

  };

  Point.prototype.normalize = function() {

    var length = this.length();

    this.x /= length;

    this.y /= length;

    return this;

  };

  return Point;

})();


/*

 * Particle class

 */

var Particle = (function() {

  function Particle() {

    this.position = new Point();

    this.velocity = new Point();

    this.acceleration = new Point();

    this.age = 0;

  }

  Particle.prototype.initialize = function(x, y, dx, dy) {

    this.position.x = x;

    this.position.y = y;

    this.velocity.x = dx;

    this.velocity.y = dy;

    this.acceleration.x = dx * settings.particles.effect;

    this.acceleration.y = dy * settings.particles.effect;

    this.age = 0;

  };

  Particle.prototype.update = function(deltaTime) {

    this.position.x += this.velocity.x * deltaTime;

    this.position.y += this.velocity.y * deltaTime;

    this.velocity.x += this.acceleration.x * deltaTime;

    this.velocity.y += this.acceleration.y * deltaTime;

    this.age += deltaTime;

  };

  Particle.prototype.draw = function(context, image) {

    function ease(t) {

      return (--t) * t * t + 1;

    }

    var size = image.width * ease(this.age / settings.particles.duration);

    context.globalAlpha = 1 - this.age / settings.particles.duration;

    context.drawImage(image, this.position.x - size / 2, this.position.y - size / 2, size, size);

  };

  return Particle;

})();


/*

 * ParticlePool class

 */

var ParticlePool = (function() {

  var particles,

      firstActive = 0,

      firstFree   = 0,

      duration    = settings.particles.duration;

 

  function ParticlePool(length) {

    // create and populate particle pool

    particles = new Array(length);

    for (var i = 0; i < particles.length; i++)

      particles[i] = new Particle();

  }

  ParticlePool.prototype.add = function(x, y, dx, dy) {

    particles[firstFree].initialize(x, y, dx, dy);

   

    // handle circular queue

    firstFree++;

    if (firstFree   == particles.length) firstFree   = 0;

    if (firstActive == firstFree       ) firstActive++;

    if (firstActive == particles.length) firstActive = 0;

  };

  ParticlePool.prototype.update = 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 < particles.length; 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 == particles.length) firstActive = 0;

    }

   

   

  };

  ParticlePool.prototype.draw = 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 < particles.length; 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 = canvas.getContext('2d'),

      particles = new ParticlePool(settings.particles.length),

      particleRate = settings.particles.length / settings.particles.duration, // particles/sec

      time;

 

  // get point on heart with -PI <= t <= PI

  function pointOnHeart(t) {

    return new Point(

      160 * Math.pow(Math.sin(t), 3),

      130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25

    );

  }

 

  // creating the particle image using a dummy canvas

  var image = (function() {

    var canvas  = document.createElement('canvas'),

        context = canvas.getContext('2d');

    canvas.width  = settings.particles.size;

    canvas.height = settings.particles.size;

    // helper function to create the path

    function to(t) {

      var point = pointOnHeart(t);

      point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;

      point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;

      return point;

    }

    // create the path

    context.beginPath();

    var t = -Math.PI;

    var point = to(t);

    context.moveTo(point.x, point.y);

    while (t < Math.PI) {

      t += 0.01; // baby steps!

      point = to(t);

      context.lineTo(point.x, point.y);

    }

    context.closePath();

    // create the fill

    context.fillStyle = '#ea80b0';

    context.fill();

    // create the image

    var image = new Image();

    image.src = canvas.toDataURL();

    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

    context.clearRect(0, 0, canvas.width, canvas.height);

   

    // create new particles

    var amount = particleRate * deltaTime;

    for (var i = 0; i < amount; i++) {

      var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());

      var dir = pos.clone().length(settings.particles.velocity);

      particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);

    }

   

    // update and draw particles

    particles.update(deltaTime);

    particles.draw(context, image);

  }

 

  // handle (re-)sizing of the canvas

  function onResize() {

    canvas.width  = canvas.clientWidth;

    canvas.height = canvas.clientHeight;

  }

  window.onresize = onResize;

 

  // delay rendering bootstrap

  setTimeout(function() {

    onResize();

    render();

  }, 10);

})(document.getElementById('pinkboard'));

  </script>

 </BODY>

</HTML>