unharmonious/range.html at master · Watilin/unharmonious · GitHub

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<!DOCTYPE html>
<html lang="fr">
<head>
  <meta charset="utf-8">
  <title>Harmonieux… Ou pas</title>
</head>
<body>

<p>
  <label>
    <input type="checkbox" /> Play
  </label>
</p>

<p>
  <label>
    Rapport&#x202F;:
    <input type="range" min="1" max="2" step="0.0001" />
  </label>
  <code>&nbsp;</code>
</p>


<p>
  Gamme pythagoricienne&#x202F;:
  <button> 1                       </button>
  <button> 9/8 (ton majeur)        </button>
  <button> 6/5 (tierce mineure)    </button>
  <button> 5/4 (tierce majeure)    </button>
  <button> 4/3 (quarte)            </button>
  <button> 7/5                     </button>
  <button> 3/2 (quinte juste)      </button>
  <button> 8/5 (sixte mineure)     </button>
  <button> 5/3 (sixte majeure)     </button>
  <button> 7/4                     </button>
  <button> 9/5 (septième mineure)  </button>
  <button> 15/8 (septième majeure) </button>
  <button> 2 (octave)              </button>
</p>

<p>
  Tempérament égal&#x202F;:
  <button> 1 (la)      </button>
  <button> 1.059       </button>
  <button> 1.122 (si)  </button>
  <button> 1.189 (do)  </button>
  <button> 1.259       </button>
  <button> 1.334 (ré)  </button>
  <button> 1.414       </button>
  <button> 1.498 (mi)  </button>
  <button> 1.587 (fa)  </button>
  <button> 1.681       </button>
  <button> 1.781 (sol) </button>
  <button> 1.887       </button>
  <button> 2 (la)      </button>
</p>

<p>
  Gamme dégueulasse&#x202F;:
  <button> 1    </button>
  <button> 8/7  </button>
  <button> 9/7  </button>
  <button> 10/7 </button>
  <button> 11/7 </button>
  <button> 12/7 </button>
  <button> 13/7 </button>
  <button> 2    </button>
</p>

<p>
  <canvas id="freq-canvas" width="600" height="200"></canvas>
</p>
<p>
  <canvas id="signal-canvas" width="600" height="200"></canvas>
</p>

<ul>
  <li>
    <a target="_blank" rel="noopener noreferrer nofollow" href="https://youtu.be/cTYvCpLRwao">https://youtu.be/cTYvCpLRwao</a>
  </li>
  <li>
  <a target="_blank" rel="noopener noreferrer nofollow" href="https://fr.wikipedia.org/wiki/Intervalle_%28musique%29#Intervalles_purs">https://fr.wikipedia.org/wiki/Intervalle_%28musique%29#Intervalles_purs</a>
  </li>
</ul>

<script> "use strict";

const MAGNETIC_SENSITIVITY = 1/48;

var $checkbox     = document.querySelector("input[type='checkbox']");
var $range        = document.querySelector("input[type='range']");
var $code         = document.querySelector("code");
var $freqCanvas   = document.querySelector("#freq-canvas");
var $signalCanvas = document.querySelector("#signal-canvas");

$checkbox.checked = false;
$code.textContent = $range.value;

var acx = new AudioContext();
var primOscillator;
var secOscillator;
var analyser = acx.createAnalyser();
analyser.connect(acx.destination);

var fcx = $freqCanvas.getContext("2d");
var scx = $signalCanvas.getContext("2d");

var animId = NaN;

function drawFrequency() {
  fcx.clearRect(0, 0, $freqCanvas.width, $freqCanvas.height);

  var xScale = 4.2 * Math.PI / $freqCanvas.width;
  var xLabelScale = $freqCanvas.width / 4.2;
  var xOffset = -0.1 * Math.PI;
  var yScale = -$freqCanvas.height / 2 + 4;
  var yOffset = $freqCanvas.height / 2;
  var intYOffset = yOffset | 0;
  var ratio = Number.parseFloat($range.value);

  fcx.beginPath();
  fcx.moveTo(0,             intYOffset - 0.5);
  fcx.lineTo($freqCanvas.width, intYOffset - 0.5);
  for (let i = 0; i <= 4; i++) {
    fcx.moveTo(((0.1 + i) * xLabelScale | 0) - 0.5, intYOffset - 6);
    fcx.lineTo(((0.1 + i) * xLabelScale | 0) - 0.5, intYOffset + 6);
    fcx.moveTo(((0.6 + i) * xLabelScale | 0) - 0.5, intYOffset - 3);
    fcx.lineTo(((0.6 + i) * xLabelScale | 0) - 0.5, intYOffset + 3);
  }
  fcx.strokeStyle = "black";
  fcx.lineWidth = 1;
  fcx.stroke();

  fcx.beginPath();
  fcx.moveTo(0, yOffset + yScale * Math.sin(xOffset));
  for (let x = 1; x < $freqCanvas.width; x++) {
    fcx.lineTo(x, yOffset + yScale * Math.sin(xOffset + x * xScale));
  }
  fcx.strokeStyle = "#D00";
  fcx.lineWidth = 2;
  fcx.stroke();

  fcx.beginPath();
  fcx.moveTo(0, yOffset + yScale * Math.sin(ratio * xOffset));
  for (let x = 1; x < $freqCanvas.width; x++) {
    fcx.lineTo(x, yOffset + yScale * Math.sin(ratio * (xOffset + x * xScale)));
  }
  fcx.strokeStyle = "#04F";
  fcx.lineWidth = 1;
  fcx.stroke();
}

function updateSecFrequency() {
  var ratio = Number.parseFloat($range.value);
  var freq = 440 * ratio;
  if (secOscillator) {
    secOscillator.frequency.value = freq;
  }
  drawFrequency();
}

$checkbox.addEventListener("change", function (event) {
  if (this.checked) {
    primOscillator = acx.createOscillator();
    primOscillator.connect(analyser);
    primOscillator.start();
    visualize();

    secOscillator = acx.createOscillator();
    secOscillator.connect(analyser);
    updateSecFrequency();
    secOscillator.start();
  }
  else if (primOscillator) {
    primOscillator.stop();
    secOscillator.stop();
    cancelAnimationFrame(animId);
  }
});

$range.addEventListener("change", function (event) {
  $code.textContent = $range.value;
  updateSecFrequency();
});

var isRangeSliding = false;
$range.addEventListener("mousedown", function (event) {
  isRangeSliding = true;
});

document.addEventListener("mouseup", function (event) {
  isRangeSliding = false;
});

document.addEventListener("mousemove", function (event) {
  if (isRangeSliding) {
    $code.textContent = $range.value;
    updateSecFrequency();
  }
});

document.addEventListener("click", function (event) {
  var $target = event.target;
  if ("BUTTON" === $target.tagName) {
    let match = $target.textContent.match(/([\d.]+)(?:\/(\d+))?/);
    if (match[2]) {
      $range.value = Number.parseFloat(match[1]) / Number.parseFloat(match[2]);
    }
    else {
      $range.value = Number.parseFloat(match[1]);
    }
    $code.textContent = $range.value;
    updateSecFrequency();
  }
});

// fonction plagiée depuis https://mdn.github.io/voice-change-o-matic/
function visualize() {
  var w = $signalCanvas.width;
  var h = $signalCanvas.height;

  //var visualSetting = visualSelect.value;
  var visualSetting = "sinewave";
  //console.log(visualSetting);

  if(visualSetting == "sinewave") {
    analyser.fftSize = 2048;
    var bufferLength = analyser.fftSize;
    console.log(bufferLength);
    var dataArray = new Uint8Array(bufferLength);

    scx.clearRect(0, 0, w, h);

    var draw = function () {
      animId = requestAnimationFrame(draw);

      analyser.getByteTimeDomainData(dataArray);

      scx.fillStyle = 'rgb(200, 200, 200)';
      scx.fillRect(0, 0, w, h);

      scx.lineWidth = 2;
      scx.strokeStyle = 'rgb(0, 0, 0)';

      scx.beginPath();

      var sliceWidth = w * 1.0 / bufferLength;
      var x = 0;

      for(var i = 0; i < bufferLength; i++) {

        var v = dataArray[i] / 128.0;
        var y = v * h/2;

        if(i === 0) {
          scx.moveTo(x, y);
        } else {
          scx.lineTo(x, y);
        }

        x += sliceWidth;
      }

      scx.lineTo(w, h/2);
      scx.stroke();
    };

    draw();
  }

  //else if(visualSetting == "frequencybars") {
  //  analyser.fftSize = 256;
  //  var bufferLengthAlt = analyser.frequencyBinCount;
  //  console.log(bufferLengthAlt);
  //  var dataArrayAlt = new Uint8Array(bufferLengthAlt);
  //
  //  scx.clearRect(0, 0, WIDTH, HEIGHT);
  //
  //  var drawAlt = function() {
  //    drawVisual = requestAnimationFrame(drawAlt);
  //
  //    analyser.getByteFrequencyData(dataArrayAlt);
  //
  //    scx.fillStyle = 'rgb(0, 0, 0)';
  //    scx.fillRect(0, 0, WIDTH, HEIGHT);
  //
  //    var barWidth = (WIDTH / bufferLengthAlt) * 2.5;
  //    var barHeight;
  //    var x = 0;
  //
  //    for(var i = 0; i < bufferLengthAlt; i++) {
  //      barHeight = dataArrayAlt[i];
  //
  //      scx.fillStyle = 'rgb(' + (barHeight+100) + ',50,50)';
  //      scx.fillRect(x,HEIGHT-barHeight/2,barWidth,barHeight/2);
  //
  //      x += barWidth + 1;
  //    }
  //  };
  //
  //  drawAlt();
  //
  //} else if(visualSetting == "off") {
  //  scx.clearRect(0, 0, WIDTH, HEIGHT);
  //  scx.fillStyle = "red";
  //  scx.fillRect(0, 0, WIDTH, HEIGHT);
  //}

}

</script>
</body>
</html>