D3 Examples - Music Viz

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="tones.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var size = 10;
    
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
​
    var staff = svg.append("g").attr("class", "staff")
        .attr("transform", "translate(50,50)")
    
    
    svg.append("text")
      .text("Twinkle, twinkle, little star")
      .attr("y", 450)
      .attr("x", 120)
      .style("font-size", 36)
      .style("font-family", "monospace")
    
    function example(){
      tones.play(440);        // plays a 440 hz tone
      tones.play("c");        // plays a C note in the 4th octave.
      tones.play("c#");       // plays a C sharp note in the 4th octave.
      tones.play("eb");       // plays an E flat note in the 4th octave.
      tones.play("c", 2);     // plays a C note in the 2nd octave.
    }
    
    var note = staff.append("g").attr("class", "note")
        .attr("transform", "translate(0,0)")
    
    var noteBody = note.append("circle")
      .attr("class", "note body")
      .attr("r", size)
        .style("fill", "#000");
    
    var noteStem = note.append("line")
        .attr("class", "note stem")
        .attr("x1", size - 1)
        .attr("x2", size - 1)
      .attr("y1", 0)
        .attr("y2", -(4 * size))
      .style("stroke", "#000")
        .style("stroke-width", 2)
    
    var noteLedger = note.append("line")
        .attr("class", "note ledger")
        .attr("x1", -(2 * size))
        .attr("x2", (2 * size))
      .attr("y1", 0)
        .attr("y2", 0)
      .style("stroke", "#000")
        .style("stroke-width", 2);
    
    var linesAndSpaces = d3.cross(
      [2, 3, 4, 5], //, 6, 7, 8, 9], 
      ['c', 'd', 'e', 'f', 'g', 'a', 'b'], (a, b) => a + b);
    
    var pitchPosition = function(note){
        return 4 + note.substring(0, 1);
    }
    
    var pitchs = tones.pitchMap[4]
    
    var trebleClef = ['4e', '4f', '4g', '4a', '4b', '5c', '5d', '5e', '5f'],
            bassClef =   ['2g', '2a', '2b', '3c', '3d', '3e', '3f', '3g', '3a'],
        fullClef = ['4c', '4d', '4e', '4f', '4g', '4a', '4b', '5c', '5d', '5e', '5f'];
    
    console.clear()
    
    var trebleScale = d3.scaleOrdinal()
        .range(d3.range(trebleClef.length * size, 0, -size))
        .domain(trebleClef)
    
    var fullScale = d3.scaleOrdinal()
        .range(d3.range(fullClef.length * size, 0, -size))
        .domain(fullClef)
        
               
    var makeStaff = d3.axisLeft(trebleScale)
        .tickValues(['4e', '4g', '4b', '5d', '5f'])
            .tickSize(-850)
        .tickFormat("")
    
    staff.call(makeStaff)
    
    var pitch = function(note, octave){
       
      if(octave == null) {
        octave = 4;
      }
      return tones.map[octave][note.toLowerCase()]
    }
    
    
    function song() {
        tones.type = "square";
        tones.attack = 20;
        tones.release = 200;
​
        var notes = "ccggaag-ffeeddc-ggffeed-ggffeed-ccggaag-ffeeddc----------",
            timing = 300,
            index = 0;
​
        var prevTime = tones.getTimeMS();
        var elapsed = 0
        play();
​
​
​
        function play() {
            var now = tones.getTimeMS();
            elapsed += now - prevTime;
            if(elapsed > timing) {
                elapsed -= timing;
                var note = notes.charAt(index);
                if(note !== "-") {
                    tones.play(note);
                  
                  d3.select("g.note").attr("transform", 
                                        "translate(" + (index * 15 + 100) + "," + 
                                   fullScale(pitchPosition(note)) + ")")
                                
                  if(fullScale(pitchPosition(note)) >= 
                     fullScale(pitchPosition('4c'))){
                    d3.select(".ledger").style("stroke-width", 2)
                  } else {
                    d3.select(".ledger").style("stroke-width", 0)
                  }
                }
                index++;
                index %= notes.length;
            }
            prevTime = now;
            requestAnimationFrame(play);
​
        }
    }
    
    song()
    
  </script>
</body>
​
    