cssAudio - Activefile-genericCSS - ActiveGeneric - ActiveHTML - ActiveImage - ActiveJS - ActiveSVG - ActiveText - Activefile-genericVideo - ActiveLovehtmlicon-new-collectionicon-personicon-teamlog-outoctocatpop-outspinnerstartv

Pen Settings

CSS Base

Vendor Prefixing

Add External CSS

These stylesheets will be added in this order and before the code you write in the CSS editor. You can also add another Pen here, and it will pull the CSS from it. Try typing "font" or "ribbon" below.

Quick-add: + add another resource

Add External JavaScript

These scripts will run in this order and before the code in the JavaScript editor. You can also link to another Pen here, and it will run the JavaScript from it. Also try typing the name of any popular library.

Quick-add: + add another resource

Code Indentation

     

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.

            
              <main class="overflow-hidden vh-100 flex items-stretch overflow-hidden">
  <svg class="w-100 h-100" viewBox="0 0 1200 1200" preserveAspectRatio="xMidYMid slice">
    <g stroke-width="6" fill="#fff" stroke="#333">
      <circle id="js-circle1" cx="400" cy="600" r="96" />
      <circle id="js-circle2" cx="400" cy="600" r="64" stroke="none" />
      <path id="js-connector" d="" fill="#333" />
    </g>
  </svg>
</main>
            
          
!
            
              // Dom Nodes

const circle1 = document.querySelector('#js-circle1');
const circle2 = document.querySelector('#js-circle2');
const connector = document.querySelector('#js-connector');
const VIEWBOX_SIZE = { W: 1200, H: 1200 };
const SIZES = {
  CIRCLE1: 96,
  CIRCLE2: 64,
};

const circle1$ = Rx.Observable.of([600, 600])
  .do(loc => { moveTo(loc, circle1); });

const circle2$ = Rx.Observable.interval(0, Rx.Scheduler.animationFrame)
  .map(frame => 200 * Math.sin(frame / 500))
  .map(x => [600 + x, 600])
  // Rx.Observable.of([712.5, 600])
  .do(loc => { moveTo(loc, circle2); });

Rx.Observable
  .combineLatest(circle1$, circle2$, (circle1Loc, circle2Loc) =>
    metaball(SIZES.CIRCLE1, SIZES.CIRCLE2, circle1Loc, circle2Loc),
  )
  .subscribe(([path, p1, p2, p3, p4, h1, h2, h3, h4]) => {
    connector.setAttribute('d', path);
  });


/**
 * Based on Metaball script by SATO Hiroyuki
 * http://shspage.com/aijs/en/#metaball
 */
function metaball(
  radius1,
  radius2,
  center1,
  center2,
  handleLenRate = 2.4,
  v = 0.5,
) {
  const HALF_PI = Math.PI / 2;
  const d = dist(center1, center2);
  const maxDist = radius1 + radius2 * 2.5;
  let u1, u2;

  if (radius1 === 0 || radius2 === 0) {
    return [''];
  }

  if (d > maxDist) {
    return [''];
  } else if (d <= Math.abs(radius1 - radius2)) {
    return [''];
  }
    
  // if (radius1 === 0 || radius2 === 0 || d > maxDist || d <= Math.abs(radius1 - radius2)) {
  //   return '';
  // }
    
  if (d < radius1 + radius2) {
    u1 = Math.acos(
      (radius1 * radius1 + d * d - radius2 * radius2) / (2 * radius1 * d),
    );
    u2 = Math.acos(
      (radius2 * radius2 + d * d - radius1 * radius1) / (2 * radius2 * d),
    );
  } else {
    u1 = 0;
    u2 = 0;
  }

  // All the angles
  const angleBetweenCenters = angle(center2, center1);
  const spread = Math.acos((radius1 - radius2) / d);
  
  const angle1 = angleBetweenCenters + u1 + (spread - u1) * v;
  const angle2 = angleBetweenCenters - u1 - (spread - u1) * v;
  const angle3 = angleBetweenCenters + Math.PI - u2 - (Math.PI - u2 - spread) * v;
  const angle4 = angleBetweenCenters - Math.PI + u2 + (Math.PI - u2 - spread) * v;
  // Points
  const p1 = getVector(center1, angle1, radius1);
  const p2 = getVector(center1, angle2, radius1);
  const p3 = getVector(center2, angle3, radius2);
  const p4 = getVector(center2, angle4, radius2);

  // Define handle length by the
  // distance between both ends of the curve
  const totalRadius = radius1 + radius2;
  const d2Base = Math.min(v * handleLenRate, dist(p1, p3) / totalRadius);

  // Take into account when circles are overlapping
  const d2 = d2Base * Math.min(1, d * 2 / (radius1 + radius2));

  const r1 = radius1 * d2;
  const r2 = radius2 * d2;

  const h1 = getVector(p1, angle1 - HALF_PI, r1);
  const h2 = getVector(p2, angle2 + HALF_PI, r1);
  const h3 = getVector(p3, angle3 + HALF_PI, r2);
  const h4 = getVector(p4, angle4 - HALF_PI, r2);

  const path = metaballToPath(
    p1, p2, p3, p4,
    h1, h2, h3, h4,
    d > radius1,
    radius2,
  );
    
  return [path, p1, p2, p3, p4, h1, h2, h3, h4];
}

function metaballToPath(p1, p2, p3, p4, h1, h2, h3, h4, escaped, r) {
  // prettier-ignore
  return [
    'M', p1,
    'C', h1, h3, p3,
    'A', r, r, 0, escaped ? 1 : 0, 0, p4,
    'C', h4, h2, p2,
  ].join(' ');
}

/**
 * Utils
 */
function moveTo([x, y] = [0, 0], element) {
  element.setAttribute('cx', x);
  element.setAttribute('cy', y);
}

function line([x1, y1] = [0, 0], [x2, y2] = [0, 0], element) {
  element.setAttribute('x1', x1);
  element.setAttribute('y1', y1);
  element.setAttribute('x2', x2);
  element.setAttribute('y2', y2);
}

function dist([x1, y1], [x2, y2]) {
  return ((x1 - x2) ** 2 + (y1 - y2) ** 2) ** 0.5;
}

function angle([x1, y1], [x2, y2]) {
  return Math.atan2(y1 - y2, x1 - x2);
}

function getVector([cx, cy], a, r) {
  return [cx + r * Math.cos(a), cy + r * Math.sin(a)];
}

            
          
!
999px
Loading ..................

Console