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HTML

              
                <div class="patterns">
  <div class="space"></div>
  <div class="pattern">
    <svg class="vis"></svg>
    <div class="range"></div>
  </div>
  <div class="pattern">
    <svg class="vis"></svg>
    <div class="range"></div>          
  </div>
  <div class="pattern">
    <svg class="vis"></svg>
    <div class="range"></div>
  </div>
  <div class="pattern">
    <svg class="vis"></svg>
    <div class="range"></div>
  </div>
  <div class="space"></div>
</div>
<footer>
  <a href="http://cgm.cs.mcgill.ca/~godfried/publications/banff.pdf" target="_blank">
    Read more about Euclidean rhythms
  </a> / See the <a href="https://codepen.io/shaunlebron/full/rYGmRv/">Bresenham Rhythms</a> variation by Shaun Lebron
</footer>
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Ubuntu:500);
@import url(https://fonts.googleapis.com/css?family=Ubuntu+Mono);
@import url(https://fonts.googleapis.com/css?family=Raleway:400,800);

* {
  font-family: "Raleway"; /* Ubuntu */
}

html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}

body {
  background: #536976;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to right, #292E49, #536976);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to right, #292E49, #536976); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */  
}
.patterns {
  display: flex;
  width: 100%;
  height: 100%;
}
.space {
  flex: 0.33;
}
.pattern {
  flex: 1;
  padding: 0 20px;

  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: center;
}
.vis {
  width: 100%;
  min-height: 300px;
}
.center {
  fill: white;
  stroke: none;
}
.hand {
  stroke: white;
  stroke-width: 2;
  stroke-linecap: round;
}
.event {
  fill: rgba(150, 150, 150, 0.5);
}
.event.active {
  fill: #EC407A;
}


.range {
  margin: 0 30px;
}
.noUi-target {
  border-width: 0;
}
.noUi-horizontal {
  height: 15px;
}
.noUi-handle {
  outline: none;
  box-shadow: none;
}
.noUi-connect {
  background-color: #EC407A;
  box-shadow: none;
}
.noUi-horizontal .noUi-tooltip {
  top: 110%;
  bottom: -30px;
  font-size: 18px;
  border-width: 0;
  background: none;
  color: white;
}

footer {
  position: absolute;
  left: 0;
  width: 100%;
  bottom: 20px;
  text-align: center;
  color: white;
}
footer a {
  color: white;
}

@media (max-width: 1023px) {
  .patterns {
    flex-direction: column;
  }
  .vis {
    min-height: auto;
  }
  .space {
    flex: 0;
  }
}  
              
            
!

JS

              
                function bjorklund(k, n) {
  let seq = _.times(k, _.constant([1])).concat(_.times(n - k, _.constant([0])));
  while (true) {
    let [head, remainder] = _.partition(seq, i => _.isEqual(i, seq[0]));
    if (remainder.length < 2) break;
    for (let i = 0; i < Math.min(head.length, remainder.length); i++) {
      seq[i] = seq[i].concat(seq.pop());
    }
  }
  return _.flatten(seq);
}

function buildPattern(k, n, visEl, centerX, centerY, radius) {
  let evts = bjorklund(k, n);
  let pattern = evts.map((evt, i) => {
    let angle = i / n * Math.PI * 2;

    let width = evt ? radius / 3 : radius / 5;
    let height = evt ? radius / 7 : radius / 10;
    let x = centerX + Math.cos(angle) * radius;
    let y = centerY + Math.sin(angle) * radius;

    let group = document.createElementNS('http://www.w3.org/2000/svg', 'g');
    group.setAttribute(
      'style',
      `transform-origin: ${x}px ${y}px; transform: rotate(${angle}rad)`
    );
    visEl.appendChild(group);

    let node = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
    node.setAttribute('x', x - width / 2);
    node.setAttribute('y', y - height / 2);
    node.setAttribute('rx', 5);
    node.setAttribute('ry', 5);
    node.setAttribute('width', width);
    node.setAttribute('height', height);
    node.setAttribute('class', `event ${evt ? 'active' : ''}`);
    group.appendChild(node);

    return { evt, angle, node, group };
  });
  return pattern;
}

function startPattern(k, n, players, containerEl) {
  let visEl = containerEl.querySelector('.vis');
  let width = visEl.getBoundingClientRect().width;
  let height = visEl.getBoundingClientRect().height;
  let size = Math.min(width, height);
  let centerX = width / 2;
  let centerY = height / 2;
  let radius = size / 4;

  let handEl = document.createElementNS('http://www.w3.org/2000/svg', 'line');
  handEl.setAttribute('x1', centerX);
  handEl.setAttribute('y1', centerY);
  handEl.setAttribute('x2', centerX + radius + 10);
  handEl.setAttribute('y2', centerY);
  handEl.setAttribute('class', 'hand');
  visEl.appendChild(handEl);

  let centerEl = document.createElementNS(
    'http://www.w3.org/2000/svg',
    'circle'
  );
  centerEl.setAttribute('cx', centerX);
  centerEl.setAttribute('cy', centerY);
  centerEl.setAttribute('r', 3);
  centerEl.setAttribute('class', 'center');
  visEl.appendChild(centerEl);

  let pattern = buildPattern(k, n, visEl, centerX, centerY, radius);

  let seq = new Tone.Sequence(
    (time, { evt, angle, node }) => {
      if (evt === 1) {
        let sample = _.sample(['1', '2', '3', '4']);
        players.get(sample).start(time);
      }
      if (evt) {
        Tone.Draw.schedule(() => {
          node.setAttribute('transform', `translate(0, 15)`);
          dynamics.animate(
            node,
            { translateX: 0, translateY: 0 },
            { type: dynamics.spring, frequency: 400 }
          );
        }, time);
      }
    },
    pattern,
    '16n'
  );
  seq.humanize = 0.01;
  seq.start();

  let rangeEl = containerEl.querySelector('.range');
  noUiSlider.create(rangeEl, {
    range: { min: 0, max: 16 },
    start: [k, n],
    margin: 0,
    connect: true,
    behaviour: 'tap-drag',
    tooltips: true,
    step: 1,
    format: {
      to: v => Math.round(v),
      from: v => Math.round(v)
    }
  });
  rangeEl.noUiSlider.on('update', ([k, n]) => {
    seq.removeAll();
    pattern.forEach(({ group }) => group.remove());
    pattern = buildPattern(k, n, visEl, centerX, centerY, radius);
    pattern.forEach((v, i) => seq.add(i, v));
    seq.loopEnd = `${pattern.length} * 16n`;
  });

  return { centerX, centerY, seq, handEl };
}

let e3Players = new Tone.Players({
  '1': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-e3-2.mp3',
  '2': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-e3-2.mp3',
  '3': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-e3-3.mp3',
  '4': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-e3-4.mp3'
}).connect(new Tone.Panner(-0.6).connect(new Tone.Gain(0.5).toMaster()));
let fs4Players = new Tone.Players({
  '1': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-fs3-1.mp3',
  '2': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-fs3-2.mp3',
  '3': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-fs3-3.mp3',
  '4': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-fs3-4.mp3'
}).connect(new Tone.Panner(-0.2).connect(new Tone.Gain(0.5).toMaster()));
let a3Players = new Tone.Players({
  '1': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-a3-1.mp3',
  '2': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-a3-2.mp3',
  '3': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-a3-3.mp3',
  '4': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-a3-4.mp3'
}).connect(new Tone.Panner(0.2).connect(new Tone.Gain(0.5).toMaster()));
let cs4Players = new Tone.Players({
  '1': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-cs4-1.mp3',
  '2': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-cs4-2.mp3',
  '3': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-cs4-3.mp3',
  '4': 'https://s3-us-west-2.amazonaws.com/s.cdpn.io/969699/eucl-cs4-4.mp3'
}).connect(new Tone.Panner(0.6).connect(new Tone.Gain(0.5).toMaster()));

Tone.Buffer.on('load', () => {
  const patternElements = Array.from(document.querySelectorAll('.pattern'));
  let e3Pattern = startPattern(3, 7, e3Players, patternElements[0]);
  let fs4Pattern = startPattern(1, 8, fs4Players, patternElements[1]);
  let a3Pattern = startPattern(4, 10, a3Players, patternElements[2]);
  let cs4Pattern = startPattern(2, 5, cs4Players, patternElements[3]);
  Tone.Transport.start();

  function updateHand({ handEl, centerX, centerY, seq }) {
    handEl.setAttribute(
      'transform',
      `translate(${centerX} ${centerY}) rotate(${seq.progress *
        360}) translate(${-centerX} ${-centerY})`
    );
  }

  function animateHands() {
    updateHand(e3Pattern);
    updateHand(fs4Pattern);
    updateHand(a3Pattern);
    updateHand(cs4Pattern);
    requestAnimationFrame(animateHands);
  }
  requestAnimationFrame(animateHands);
});

StartAudioContext(Tone.context, document.documentElement);

              
            
!
999px

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