Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <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>
              
            
!

CSS

              
                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; 
}
              
            
!

JS

              
                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
      document.addEventListener('mousemove', documentMouseMoveHandler, false);
      document.addEventListener('mousedown', documentMouseDownHandler, false);
      document.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();
  
  
              
            
!
999px

Console