1 : "C3",

2 : "D3",

4 : "E3",

8 : "F3",

64 : "G3",

128 : "A3",

256 : "B3",

512 : "C4",

3 : "C3maj",

6 : "D3maj",

12 : "E3maj",

72 : "F3maj",

192 : "G3maj",

384 : "A3maj",

768 : "B3maj",

513 : "C4maj",

5 : "C3min",

10 : "D3min",

68 : "E3min",

136 : "F3min",

320 : "G3min",

640 : "A3min",

257 : "B3min",

514 : "C4min",

7 : "C3pow",

14 : "D3pow",

76 : "E3pow",

200 : "F3pow",

448 : "G3pow",

896 : "A3pow",

769 : "B3pow",

515 : "C4pow",

11 : "C3aug",

70 : "D3aug",

140 : "E3aug",

328 : "F3aug",

704 : "G3aug",

385 : "A3aug",

770 : "B3aug",

517 : "C4aug",

15  : "C37th",

78  : "D37th",

204 : "E37th",

456 : "F37th",

960 : "G37th",

897 : "A37th",

771 : "B37th",

519 : "C47th"

}

​

var keydisp = [];

​

var strumming = 0;

var hist = {

  0 :0,

  1 :0,

  2 :0,

  3 :0,

  4 :0,

  5 :0,

  6 :0,

  7 :0

}

​

var key2id = {

  "A" : 0,

  "S" : 1,

  "D" : 2,

  "F" : 3,

  "V" : 4,

  "N" : 5,

  "J" : 6,

  "K" : 7,

  "L" : 8,

  "º" : 9,

  " " : 10

};

​

dict_notes = {  

  "C":0,

  "D":1,

  "E":2,

  "F":3,

  "G":4,

  "A":5,

  "B":6,

};

​

note_symb = {

  0: "C",

  1: "C#",

  2: "D",

  3: "D#",

  4: "E",

  5: "F",

  6: "F#",

  7: "G",

  8: "G#",

  9: "A",

  10: "A#",

  11: "B"

}

​

chords = {

  "" : [0],

  "maj" : [0, 4, 7],

  "min" : [0, 3, 7],

  "7th" : [0, 4, 8],

  "aug" : [0, 4, 7, 10],

  "pow" : [0, 7, 12]

}

​

dict_octave = {

  0 : -12,

  1 : 0,

  2 : +12

}

var basenote;

var scale_switch = 0;

​

var id2key = {

  0  : 65,

  1  : 83,

  2  : 68,

  3  : 70,

  4  : 86,

  5  : 78,

  6  : 74,

  7  : 75,

  8  : 76,

  9  : 186,

  10  : 32

}

​

var osc = [];

var env = [];

var bufid = 0;

var scales;

var scale_len = 0;

​

function preload() {

  scales = {

    0    : {

        0: "major" ,

        1: [0, 2, 4, 5, 7, 9, 11, 12]

    },

    1 : {

        0: "natural minor" ,

        1: [0, 2, 3, 5, 7, 8, 10, 12]

    },

    2    : {

        0: "harmonic minor" ,

        1: [0, 2, 3, 5, 7, 8, 11, 12]

    },

    3    : {

        0: "blue scale shoes",

        1: [0, 3, 5, 6, 7, 10, 12, 24]

    },

    4    : {

        0: "lacadaemonian",

        1: [0,3,4,5,9,10,11,12]

    },

    5    : {

        0: "kubb",

        1: [5,5,5,5,5,5,5,5]

    },

    6    : {

        0: "bbuk",

        1: [12,11,9,7,5,4,2,0]

    },

    7    : {

        0: "blue scale shoes",

        1: [0, 3, 5, 6, 7, 10, 12, 24]

    },

    8    : {

        0: "blue scale shoes",

        1: [0, 3, 5, 6, 7, 10, 12, 24]

    }

  }

}

​

function setup() {

  console.log("setting up");

  for (var s in scales) {

    scale_len++;

  }

  basenote = 36;

  createCanvas(400,150);

  for (var i = 0; i < 10; i++) {

    osc.push(new p5.TriOsc());

    osc[i].start();

    osc[i].amp(0);

    env.push(new p5.Env());

    env[i].setADSR(0.005, 0.5, 0.1, 0.5);

    env[i].setRange(0.5, 0);

  }

  for (i = 0; i < 50; i++){

    keydisp[i] = 1;

  }

}

​

// A function to play a note

function playNote(id) {

  osc[bufid].freq(midiToFreq(id));

  // Fade it in

  env[bufid].play(osc[bufid],0,0.1);

  bufid = (bufid+1) % osc.length;

}

​

function draw() {

  background(255);

  // min id is 0, max is 40ish?

  stroke(0);

  for (var i = 0; i<50 ; i++){

    fill(keydisp[i]*255);

    keydisp[i] = constrain(keydisp[i]+0.05,0,1);

    rect(i*width/50,0,width/50-1,39);

  }

  var comb = 0;

  if (!strumming){

    var oct_sw = 1;

    for (i = 0; i < 10; i++){

      if (keyIsDown(id2key[10])){

        if (i>5 || i<4){

          if (keyIsDown(id2key[i])){

            comb += pow(2,i);

          }

        } else {

          if (keyIsDown(id2key[i])){

            oct_sw = (i==4) ? 0 : 2;

          }

        }

      }

    }

    var chord = finger_pattern[comb];

    if (comb>0){

      console.log(comb);

    }

    if (chord){

      console.log(chord);

      var base = dict_notes[chord.slice(0,1)];

      base = scales[scale_switch][1][base];

      base += dict_octave[oct_sw];

      if (chord.slice(1,2)==="4"){

        base += 12;

      }

      base += basenote;

      var toplay = [];

      for (var notes_of_chord in chords[chord.slice(2,5)]){

        toplay.push(base + chords[chord.slice(2,5)][notes_of_chord]);

      }

      for (var id in toplay) {

        playNote(toplay[id]+24);

        keydisp[toplay[id]-basenote+12] = 0;

      }

    }

    strumming = 1;

  }

  if(!keyIsDown(id2key[10])){

    strumming = 0;

  }

  noStroke();

  fill(0);

  var basenote_symb = note_symb[(basenote%12)] + " " + (round(floor(basenote/12))).toString();

  text(basenote_symb,10,height-60);

  text(scales[scale_switch][0],10,height-45);

}

​

function getBase(name){

    return dict_notes[name]

}

function getMaj(idx){

    return [idx, idx+4, idx+7]

}

​

function getMin(idx){

    return [idx, idx+3, idx+7]

}

​

function getAug(idx){

    return [idx, idx+4, idx+8]

}

​

function get7th(idx){

  return [idx, idx+4, idx+7, idx+10]

}

​

function keyPressed() {

  if (keyCode === UP_ARROW){

    basenote += 1;

  } else if (keyCode === DOWN_ARROW) {

    basenote -= 1;

  } else if (keyCode === LEFT_ARROW) {

    scale_switch = ((scale_switch - 1 + scale_len)%scale_len);

  } else if (keyCode === RIGHT_ARROW) {

    scale_switch = ((scale_switch + 1 + scale_len)%scale_len); // not necessary but more readable

  }

}

​