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              <div class="flex items-center vh-100">
  <svg
    xmlns="http://www.w3.org/2000/svg"
    viewBox="0 0 400 400"
    preserveAspectRatio="xMidYMid"
    class="w-100 h-100"
  >
    <g fill="none" stroke-width="2" stroke-linejoin="round">
      <!-- <path id="js-debug" stroke="#F012BE" stroke-width="1" d="" />
      <circle cx="" cy="" r="5" id="js-circum-center" fill="#F012BE" /> -->

      <path id="js-triangle" stroke="#333" d="" />
      <path id="js-centroid-triangle" stroke="#01FF70" d="" />
      <circle cx="" cy="" r="10" id="js-handle-1" fill="#A463F2" opacity="0.55" />
      <circle cx="" cy="" r="10" id="js-handle-2" fill="#A463F2" opacity="0.55" />
      <circle cx="" cy="" r="10" id="js-handle-3" fill="#A463F2" opacity="0.55" />
    </g>
  </svg>
</div>

<a href="http://triangle.life" target="_blank" class="▲">
  त्रिकोण
</a>
            
          
!
            
              body { overflow: hidden; }


.▲ {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  background-color: #0074d9;
  color: #7fdbff;
  width: 4rem;
  display: block;
  height: 2rem;
  border-radius: 0.25rem;
  width: 4rem;
  height: 2rem;
  font-size: 0.875rem;
  line-height: 2rem;
  text-align: center;
  text-decoration: none;
}

.▲ {
  -moz-osx-font-smoothing: grayscale;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: translateZ(0);
  transform: translateZ(0);
  -webkit-transition: -webkit-transform .25s ease-out;
  transition: -webkit-transform .25s ease-out;
  transition: transform .25s ease-out;
  transition: transform .25s ease-out, -webkit-transform .25s ease-out;
}
.▲:hover,
.▲:focus {
  -webkit-transform: scale(1.05);
  transform: scale(1.05);
}
.▲:active {
  -webkit-transform: scale(.90);
  transform: scale(.90);
}

            
          
!
            
              // Dom Nodes
const triangle = document.querySelector('#js-triangle');
const centroidTriangle = document.querySelector('#js-centroid-triangle');
const handle1 = document.querySelector('#js-handle-1');
const handle2 = document.querySelector('#js-handle-2');
const handle3 = document.querySelector('#js-handle-3');
const showDebug = false;

if (showDebug) {
  const debugCC = document.querySelector('#js-circum-center');
  const debug = document.querySelector('#js-debug');
}

const animationFrame$ = Rx.Observable.interval(0, Rx.Scheduler.animationFrame);

// Drag Handler
const drag = (domNode, pan$) =>
  pan$.filter(e => e.type === 'panstart').switchMap(pd => {
    const start = {
      x: +domNode.getAttribute('cx'),
      y: +domNode.getAttribute('cy'),
    };
    const w = document.body.clientWidth;
    const h = document.body.clientHeight;
    domNode.setAttribute('r', 15);

    const svgW = w > h ? 400 * w / h : 400;
    const svgH = w > h ? 400 : 400 * h / w;

    const move$ = pan$
      .filter(e => e.type === 'panmove')
      .map(pm => {
        return {
          x: start.x + linInterp(pm.deltaX, 0, w, 0, svgW),
          y: start.y + linInterp(pm.deltaY, 0, h, 0, svgH),
        };
      })
      .takeUntil(pan$.filter(e => e.type === 'panend'));

    move$.subscribe(null, null, () => domNode.setAttribute('r', 10));

    return move$;
  });

const handleDrag = domNode => {
  const hammerPan = new Hammer(domNode, {
    direction: Hammer.DIRECTION_ALL,
  });

  hammerPan.get('pan').set({ direction: Hammer.DIRECTION_ALL });

  const pan$ = Rx.Observable.fromEventPattern(h =>
    hammerPan.on('panstart panup pandown panmove panend', h),
  );

  const drag$ = drag(domNode, pan$);

  return animationFrame$
    .withLatestFrom(drag$, (_, e) => e)
    .scan(RxCSS.lerp(0.1))
    .map(p => [p.x, p.y]);
};

const points$ = Rx.Observable.combineLatest(
  handleDrag(handle1).startWith([100, 200]),
  handleDrag(handle2).startWith([150, 100]),
  handleDrag(handle3).startWith([300, 200]),
);

const triangle$ = points$
  .distinctUntilChanged((p, n) => Math.abs(addAll(p) - addAll(n)) < 0.1)
  .map(points => ({
    points,
    circumCenter: circumCenter(...points),
  }));

// State: Main Triangle, Equilateral triangles and Centroid Triangle
const state$ = triangle$
  .map(({ points: [u, v, w], circumCenter }) => ({
    triangle: [u, v, w],
    a: eqTriangle(u, v, circumCenter, w),
    b: eqTriangle(v, w, circumCenter, u),
    c: eqTriangle(w, u, circumCenter, v),
    circumCenter,
  }))
  .map(({ triangle, a, b, c, circumCenter }) => ({
    triangle,
    a,
    b,
    c,
    centroidTriangle: [centroid(a), centroid(b), centroid(c)],
    cc: circumCenter,
  }));

// Convert state to SVG geometry and render
const svgGeometry$ = state$.map(
  ({ triangle, a, b, c, centroidTriangle, cc }) => {
    return {
      triangleD: [
        'M',
        triangle.join('L'),
        'L',
        a.join('L'),
        'L',
        b.join('L'),
        'L',
        c.join('L'),
      ],
      cc,
      debugD: [
        'M',
        ...triangle[0],
        'L',
        ...cc,
        'L',
        ...triangle[1],
        'M',
        ...cc,
        'L',
        ...triangle[2],
        'M',
        ...a[1],
        'L',
        ...cc,
        'L',
        ...b[1],
        'M',
        ...cc,
        'L',
        ...c[1],
      ].join(' '),
      centroidTriangleD: ['M', centroidTriangle.join('L'), 'Z'],
      handles: [triangle[0], triangle[1], triangle[2]],
    };
  },
);

svgGeometry$.subscribe(
  ({ triangleD, centroidTriangleD, handles: [h1, h2, h3], cc, debugD }) => {
    triangle.setAttribute('d', triangleD.join(''));
    centroidTriangle.setAttribute('d', centroidTriangleD.join(''));
    handle1.setAttribute('cx', h1[0]);
    handle1.setAttribute('cy', h1[1]);
    handle2.setAttribute('cx', h2[0]);
    handle2.setAttribute('cy', h2[1]);
    handle3.setAttribute('cx', h3[0]);
    handle3.setAttribute('cy', h3[1]);

    if (showDebug) {
      debugCC.setAttribute('cx', cc[0]);
      debugCC.setAttribute('cy', cc[1]);
      debug.setAttribute('d', debugD);
    }
  },
);

/**
 * Geometry
 */
function eqTriangle(u, v, cc) {
  return [u, apex(u, v, cc), v];
}

function apex([ux, uy], [vx, vy], [ccx, ccy]) {
  const [mpx, mpy] = [(vx + ux) / 2, (vy + uy) / 2];
  const dir = sign([ccx, ccy], [ux, uy], [vx, vy]) > 0 ? 1 : -1;
  const ccMp = [mpx - ccx, mpy - ccy].map(x => x * dir);

  const h = triangleHeight([ux, uy], [vx, vy]);
  const m = magnitude(ccMp);

  const [nx, ny] = ccMp.map(s => s * (h + dir * m) / m);

  return [nx + ccx, ny + ccy];
}

function circumCenter([ax, ay], [bx, by], [cx, cy]) {
  const d = (ax - cx) * (by - cy) - (bx - cx) * (ay - cy);
  const x =
    (((ax - cx) * (ax + cx) + (ay - cy) * (ay + cy)) / 2 * (by - cy) -
      ((bx - cx) * (bx + cx) + (by - cy) * (by + cy)) / 2 * (ay - cy)) /
    d;
  const y =
    (((bx - cx) * (bx + cx) + (by - cy) * (by + cy)) / 2 * (ax - cx) -
      ((ax - cx) * (ax + cx) + (ay - cy) * (ay + cy)) / 2 * (bx - cx)) /
    d;

  return [Math.round(x * 100) / 100, Math.round(y * 100) / 100];
}

function centroid([[ux, uy], [vx, vy], [wx, wy]]) {
  return [avg(ux, vx, wx), avg(uy, vy, wy)];
}

/**
 * Utils
 */
function magnitude([x, y]) {
  return (x ** 2 + y ** 2) ** 0.5;
}

function triangleHeight([ux, uy], [vx, vy]) {
  return 3 ** 0.5 * dist([ux, uy], [vx, vy]) / 2;
}

function dist([ux, uy], [vx, vy]) {
  return Math.sqrt((ux - vx) * (ux - vx) + (uy - vy) * (uy - vy));
}

function avg(t0, t1, t2) {
  return (t0 + t1 + t2) / 3;
}

function linInterp(x, x1, x2, y1, y2) {
  return (x - x1) * ((y2 - y1) / (x2 - x1)) + y1;
}

function add(a, b) {
  return a + b;
}

function addAll(list) {
  return list.map(x => x.reduce(add, 0)).reduce(add, 0);
}

function sign([p1x, p1y], [p2x, p2y], [p3x, p3y]) {
  return (p1x - p3x) * (p2y - p3y) - (p2x - p3x) * (p1y - p3y);
}

            
          
!
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