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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <p>Double-click to add new nodes. Drag to move them. <br>Change skin: <a id="prevSkin" href="#">Previous</a> / <a id="nextSkin" href="#">Next</a>.</p>

<canvas id='world'></canvas>
            
          
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              body { 
  background-color: #000; 
  padding: 0; 
  margin: 0; 
  overflow: hidden; 
}

p { 
  position: absolute; 
  z-index: 99; 
  color: #ccc; 
  margin: 10px; 
  padding: 0; 
  font-family: Arial; 
  font-size: 11px; 
}

a { 
  color: #24cad6; 
}
            
          
!
            
              Magnetic = new function() {
  
  var SCREEN_WIDTH = window.innerWidth;
  var SCREEN_HEIGHT = window.innerHeight;
  
  var MAGNETS_AT_START = 4;
  var PARTICLES_PER_MAGNET = 20;
  var MAGNETIC_FORCE_THRESHOLD = 300;

  var canvas;
  var context;
  var particles = [];
  var magnets = [];
  
  var mouseX = (window.innerWidth - SCREEN_WIDTH);
  var mouseY = (window.innerHeight - SCREEN_HEIGHT);
  var mouseIsDown = false;
  var mouseDownTime = 0;
  
  var skinIndex = 0;
  var skins = [
     { glowA: 'rgba(0,200,250,0.3)', glowB: 'rgba(0,200,250,0.0)', particleFill: '#ffffff', fadeFill: 'rgba(22,22,22,.6)', useFade: true },
     { glowA: 'rgba(230,0,0,0.3)', glowB: 'rgba(230,0,0,0.0)', particleFill: '#ffffff', fadeFill: 'rgba(22,22,22,.6)', useFade: true },
     { glowA: 'rgba(0,230,0,0.3)', glowB: 'rgba(0,230,0,0.0)', particleFill: 'rgba(0,230,0,0.7)', fadeFill: 'rgba(22,22,22,.6)', useFade: true },
     { glowA: 'rgba(0,0,0,0.3)', glowB: 'rgba(0,0,0,0.0)', particleFill: '#333333', fadeFill: 'rgba(255,255,255,.6)', useFade: true },
     { glowA: 'rgba(0,0,0,0.0)', glowB: 'rgba(0,0,0,0.0)', particleFill: '#333333', fadeFill: 'rgba(255,255,255,.2)', useFade: true },
     { glowA: 'rgba(230,230,230,0)', glowB: 'rgba(230,230,230,0.0)', particleFill: '#ffffff', fadeFill: '', useFade: false }
  ];
  
  this.init = function() {
    
    canvas = document.getElementById( 'world' );
    
    if (canvas && canvas.getContext) {
      context = canvas.getContext('2d');
      
      // Register event listeners
      window.addEventListener('mousemove', documentMouseMoveHandler, false);
      window.addEventListener('mousedown', documentMouseDownHandler, false);
      window.addEventListener('mouseup', documentMouseUpHandler, false);
      document.getElementById( 'prevSkin' ).addEventListener('click', previousSkinClickHandler, false);
      document.getElementById( 'nextSkin' ).addEventListener('click', nextSkinClickHandler, false);
      window.addEventListener('resize', windowResizeHandler, false);
      
      createMagnets();
      
      windowResizeHandler();
      
      setInterval( loop, 1000 / 60 );
    }
  }

  function createMagnets() {
    var w = 300;
    var h = 300;
    
    for (var i = 0; i < MAGNETS_AT_START; i++) {
      var position = {
        x: ( SCREEN_WIDTH - w ) * 0.5 + (Math.random() * w), 
        y: ( SCREEN_HEIGHT - h ) * 0.5 + (Math.random() * h)
      };
      
      createMagnet( position );
    }
  }
  
  function createMagnet( position ) {
    var m = new Magnet();
    m.position.x = position.x;
    m.position.y = position.y;
    
    magnets.push( m );
    
    createParticles( m.position );
  }

  function createParticles( position ) {
    for (var i = 0; i < PARTICLES_PER_MAGNET; i++) {
      var p = new Particle();
      p.position.x = position.x;
      p.position.y = position.y;
      p.shift.x = position.x;
      p.shift.y = position.y;
      p.color = skins[skinIndex].particleFill;
      
      particles.push( p );
    }
  }

  function documentMouseMoveHandler(event) {
    mouseX = event.clientX - (window.innerWidth - SCREEN_WIDTH) * .5;
    mouseY = event.clientY - (window.innerHeight - SCREEN_HEIGHT) * .5;
  }
  
  function documentMouseDownHandler(event) {
    event.preventDefault();
    
    mouseIsDown = true;
    
    if( new Date().getTime() - mouseDownTime < 300 ) {
      // The mouse was pressed down twice with a < 300 ms interval: add a magnet
      createMagnet( { x: mouseX, y: mouseY } );
      
      mouseDownTime = 0;
    }
    
    mouseDownTime = new Date().getTime();
    
    for( var i = 0, len = magnets.length; i < len; i++ ) {
      magnet = magnets[i];
      
      if( distanceBetween( magnet.position, { x: mouseX, y: mouseY } ) < magnet.orbit * .5 ) {
        magnet.dragging = true;
        break;
      }
    }
  }
  
  function documentMouseUpHandler(event) {
    mouseIsDown = false;
    
    for( var i = 0, len = magnets.length; i < len; i++ ) {
      magnet = magnets[i];
      magnet.dragging = false;
    }
  }
    
  function previousSkinClickHandler(event) {
    event.preventDefault();
    --skinIndex;
    updateSkin();
  }
    
  function nextSkinClickHandler(event) {
    event.preventDefault();
    ++skinIndex;
    updateSkin();
  }
  
  function updateSkin() {
    skinIndex = skinIndex < 0 ? skins.length-1 : skinIndex;
    skinIndex = skinIndex > skins.length-1 ? 0 : skinIndex;

    for (var i = 0, len = particles.length; i < len; i++) {
      particles[i].color = skins[skinIndex].particleFill;
    }
  }
  
  function windowResizeHandler() {
    SCREEN_WIDTH = window.innerWidth;
    SCREEN_HEIGHT = window.innerHeight;
    
    canvas.width = SCREEN_WIDTH;
    canvas.height = SCREEN_HEIGHT;
    
    canvas.style.position = 'absolute';
    canvas.style.left = (window.innerWidth - SCREEN_WIDTH) * .5 + 'px';
    canvas.style.top = (window.innerHeight - SCREEN_HEIGHT) * .5 + 'px';
  }

  function loop() {
    
    if( skins[skinIndex].useFade) {
      context.fillStyle = skins[skinIndex].fadeFill;
         context.fillRect(0, 0, context.canvas.width, context.canvas.height);
    }
    else {
      context.clearRect(0,0,canvas.width,canvas.height);
    }
    
    var particle, magnet;
    var i, j, ilen, jlen;
    
    // Render the magnets
    for( j = 0, jlen = magnets.length; j < jlen; j++ ) {
      magnet = magnets[j];
      
      if( magnet.dragging ) {
        magnet.position.x += ( mouseX - magnet.position.x ) * 0.2;
        magnet.position.y += ( mouseY - magnet.position.y ) * 0.2;
      }
      
      // Increase the size of the magnet center point depending on # of connections
      magnet.size += ( (magnet.connections/3) - magnet.size ) * 0.025;
      magnet.size = Math.max(magnet.size,2);
      
      var gradientFill = context.createRadialGradient(magnet.position.x,magnet.position.y,0,magnet.position.x,magnet.position.y,magnet.size*10);
      gradientFill.addColorStop(0,skins[skinIndex].glowA);
      gradientFill.addColorStop(1,skins[skinIndex].glowB);
      
      context.beginPath();
      context.fillStyle = gradientFill;
      context.arc(magnet.position.x, magnet.position.y, magnet.size*10, 0, Math.PI*2, true);
      context.fill();
      
      context.beginPath();
      context.fillStyle = '#00000000';
      context.arc(magnet.position.x, magnet.position.y, magnet.size, 0, Math.PI*2, true);
      context.fill();
      
      magnet.connections = 0;
    }
    
    // Render the particles
    for (i = 0, ilen = particles.length; i < ilen; i++) {
      particle = particles[i];
      
      var currentDistance = -1;
      var closestDistance = -1;
      var closestMagnet = null;
      
      var force = { x: 0, y: 0 };
      
      // For each particle, we check what the closes magnet is
      for( j = 0, jlen = magnets.length; j < jlen; j++ ) {
        magnet = magnets[j];
        
        currentDistance = distanceBetween( particle.position, magnet.position ) - ( magnet.orbit * 0.5 );
        
        if( particle.magnet != magnet ) {
          var fx = magnet.position.x - particle.position.x;
          if( fx > -MAGNETIC_FORCE_THRESHOLD && fx < MAGNETIC_FORCE_THRESHOLD ) {
            force.x += fx / MAGNETIC_FORCE_THRESHOLD;
          }
          
          var fy = magnet.position.y - particle.position.y;
          if( fy > -MAGNETIC_FORCE_THRESHOLD && fy < MAGNETIC_FORCE_THRESHOLD ) {
            force.y += fy / MAGNETIC_FORCE_THRESHOLD;
          }
          
        }
          
        if( closestMagnet == null || currentDistance < closestDistance ) {
          closestDistance = currentDistance;
          closestMagnet = magnet;
        }
      }
      
      if( particle.magnet == null || particle.magnet != closestMagnet ) {
        particle.magnet = closestMagnet;
      }
      
      closestMagnet.connections += 1;
      
      // Rotation
      particle.angle += particle.speed;
      
      // Translate towards the magnet position
      particle.shift.x += ( (closestMagnet.position.x+(force.x*8)) - particle.shift.x) * particle.speed;
      particle.shift.y += ( (closestMagnet.position.y+(force.y*8)) - particle.shift.y) * particle.speed;
      
      // Appy the combined position including shift, angle and orbit
      particle.position.x = particle.shift.x + Math.cos(i+particle.angle) * (particle.orbit*particle.force);
      particle.position.y = particle.shift.y + Math.sin(i+particle.angle) * (particle.orbit*particle.force);
      
      // Limit to screen bounds
      particle.position.x = Math.max( Math.min( particle.position.x, SCREEN_WIDTH-particle.size/2 ), particle.size/2 );
      particle.position.y = Math.max( Math.min( particle.position.y, SCREEN_HEIGHT-particle.size/2 ), particle.size/2 );
      
      // Slowly inherit the cloest magnets orbit
      particle.orbit += ( closestMagnet.orbit - particle.orbit ) * 0.1;
      
      context.beginPath();
      context.fillStyle = particle.color;
      context.arc(particle.position.x, particle.position.y, particle.size/2, 0, Math.PI*2, true);
      context.fill();
    }
  }
  
  function distanceBetween(p1,p2) {
    var dx = p2.x-p1.x;
    var dy = p2.y-p1.y;
    return Math.sqrt(dx*dx + dy*dy);
  }
  
};

function Particle() {
  this.size = 0.5+Math.random()*3.5;
  this.position = { x: 0, y: 0 };
  this.shift = { x: 0, y: 0 };
  this.angle = 0;
  this.speed = 0.01 + (this.size/4) * 0.015;
  this.force = 1 - (Math.random()*0.15);
  this.color = '#ffffff';
  this.orbit = 1;
  this.magnet = null;
}

function Magnet() {
  this.orbit = 100;
  this.position = { x: 0, y: 0 };
  this.dragging = false;
  this.connections = 0;
  this.size = 1;
}


Magnetic.init();
  
  
            
          
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