// incorporating elements of tone.js library

// Inspiration: https://editor.p5js.org/asd0999/sketches/r1od2atFQ

​

// ------------- setting global variables -------------

​

​

// set some colors ----

let buttonColor = "#7c3f58";

let textColor = "#e2f3e4";

let bpmTextColor = "#e2f3e4";

let canvasColor = "#ee8695";

let gridColor = "##e2f3e4";

// -----------

​

// vars to control playback ----

let numSteps = 8; // number of columns / loop (x-axis)

let currentStep = 0;

let numSamples = 4; // number of sounds / kit (y-axis)

let beat = 0;

let value = 0;

let cells = []; // stores cells as list

​

// grid drawing settings ----

let a = 40; // cell height variable

let b = 25; // cell width variable

let gridW, gridH, cellW, cellH; // initializing values for grid

let colors = ["#292831", "#333f58", "#4a7a96", "#96b0b3" ]; // array of colors

// -----------

​

// button for play/pause, slider for controlling BPM / speed

let playButton;

let slider;

let w = 800;

let h = 700;

// -----------

// bpm/mascot/ settings ----

let drummingSpeed = 5.5;

//let drumMap;

let swayingSpeed = 0.1;

// -----------

​

// sample kits/sounds ----

let beats; // kit 1

let trap; // kit 2

let mix; // kit 3

let kitChosen; // variable for choosing drum kit

let soundNames = ["kick", "snare", "hat", "other"]; //one of each in each kit

// associate different sounds with each kit

//Tone.Player is a way to load and play back an audio file

// -----------

​

// create three sets of beat sounds ----

// these can be replaced with different kit sounds

beats = new Tone.Players({

  kick: "sounds/beats/kick1.wav",

  snare: "sounds/beats/snare1.wav",

  hat: "sounds/beats/hat1.wav",

  other: "sounds/beats/other1.wav",

});

​

trap = new Tone.Players({

  kick: "sounds/trap/kick2.wav",

  snare: "sounds/trap/snare2.wav",

  hat: "sounds/trap/hat2.wav",

  other: "sounds/trap/other2.wav",

});

mix = new Tone.Players({

  kick: "sounds/mix/kick3.mp3",

  snare: "sounds/mix/snare3.mp3",

  hat: "sounds/mix/hat3.mp3",

  other: "sounds/mix/other3.mp3",

});

​

​

// toMaster function connects the output to the context's destination node

beats.toMaster();

trap.toMaster();

mix.toMaster();

​

// transport is a timekeeper function in tone.js

//8th means 8th note

Tone.Transport.scheduleRepeat(onTheBeat, "8n");

​

// ------------- end of setting global variables ---------------

​

function setup() {

  mascot = new mascot(350, 600);

  // slider for bpm

  slider = createSlider(50, 200, 100);

  slider.position(540, 445);

  slider.input(speedVisualization)

  slider.style("width", "200px");

  // mapping slider to bpm ----

​

  // drop down menu to select kit ----

  menu = createSelect();

  menu.position(70, 395);

  menu.size(150, 70);

  menu.style('background-color', buttonColor);

  menu.style("font-family", "Fredoka One");

  menu.style("font-size", "30px");

  menu.style("text-align", "center");

  menu.style("border-width", "0px") // get rid of border width

  menu.style("color", textColor)

  menu.style("border-radius", "20px")

  menu.selected("beats");

  menu.option("beats");

  menu.option("trap");

  menu.option("mix");

  menu.changed(mySelectEvent);

  kitChosen = menu.value(); // set kit chosen to be menu item selected

​

  // initialize cells

  // OFF = 0, ON = 1

  for (let sample = 0; sample < numSamples; sample++) {

    cells[sample] = []; // make empty list of 4 rows

    //

    for (let step = 0; step < numSteps; step++) {

      cells[sample][step] = 0; // set each cell in row to 0

    }

  }

  // visual settings for grid ----

  createCanvas(800, 700);

  gridW = w - 2 * b;

  gridH = w / 2 - 2 * a;

  cellW = gridW / numSteps;

  cellH = gridH / numSamples;

​

  // create play button ----

  playButton = createButton("PLAY");

  playButton.position(280, 380);

  playButton.mouseClicked(togglePlay);

  playButton.style('background-color', buttonColor);

  playButton.size(200, 100);

  playButton.style("font-family", "Fredoka One");

  playButton.style("color", textColor)

  playButton.style("font-size", "48px");

  playButton.style("border-width", "0px") // get rid of border/stroke

  playButton.style("border-radius", "20px")

​

}

​

function onTheBeat(time) {

  currentStep = beat % numSteps; //beat starts at 0, numSteps is global num of columns

  for (let sample = 0; sample < numSamples; sample++) { //

    if (cells[sample][currentStep]) { // if row at column is 'on'

      let k, k2, k3;

      // grab correct sample from chosen kit

      if (kitChosen == "beats") {

        k = beats.get(soundNames[sample]);

        k.start(time);

      } else if (kitChosen == "trap") {

        k2 = trap.get(soundNames[sample]);

        k2.start(time);

      } else if (kitChosen == "mix") {

        k3 = mix.get(soundNames[sample]);

        k3.start(time);

      }

    }

  }

  beat++; //increase beat for looping

}

​

function draw() {

  // initialize canvas + mascot each time

  background(canvasColor);

  slider.input(speedVisualization)

  mascot.updateSpeedSway(drummingSpeed, swayingSpeed);

  mascot.display();

  mascot.update();

​

  // create bpm slider ---------

  fill("#7c3f58")

  noStroke();

  rect(595, 390, 80,

       45, 20);

  textSize(24);

  fill(bpmTextColor);

  noStroke();

  text('BPM', 610, 420);

  textFont('Fredoka One');

  // make BPM slider control speed of playback

  let maxBpm = slider.value();

  // use Tone.Transport to help with bpm

  Tone.Transport.bpm.value = maxBpm;

  //fill(value);

  // ---------------

​

  // fill the cells in grid

  for (let step = 0; step < numSteps; step++) {

    for (let sample = 0; sample < numSamples; sample++) {

      if (cells[sample][step] == 1) { // if user turned cell 'on'

        fill(colors[sample]); // fill with correct color scheme

        rect(

          b + step * cellW,

          a + sample * cellH,

          cellW,

          cellH

        );

      }

    }

  }

​

  // horizontal lines

  for (let i = 0; i <= numSamples; i++) {

    let y = a + i * cellH;

    right = w - b;

    strokeWeight(3);

    stroke(gridColor);

    line(b, y, right, y);

  }

​

  // vertical lines

  noStroke();

  for (let i = 0; i <= numSteps; i++) {

    right = w - b;

    strokeWeight(3);

    stroke(gridColor);

    line(b + i * cellW, a, b + i * cellW, a + gridH);

​

    // highlight the cell that is playing

    let step = (beat - 1) % numSteps;

    if (i == step && Tone.Transport.state == "started") {

      fill(0,40); // highlight column with a shade of black

      noStroke();

      rect(b + i * cellW, a, cellW, gridH);

    }

  }

}

​

​

function mousePressed() {

  // make sure the mouse is in the grid

  if (

    b < mouseX &&

    mouseX < b + gridW &&

    a < mouseY &&

    mouseY < a + gridH

  ) {

    // margins

    let x = mouseX - b;

    let y = mouseY - a;

​

    // which cell is clicked

    let i = floor(x / cellW);

    let j = floor(y / cellH);

​

    // cell on/off switch

    cells[j][i] = !cells[j][i];

  }

}

// PLAY / PAUSE button

function togglePlay() {

  if (Tone.Transport.state == "started") {

    Tone.Transport.stop();

    playButton.html("PLAY");

  } else {

    if (beats.loaded && trap.loaded) {

      Tone.Transport.start();

      playButton.html("PAUSE");

    }

  }

}

​

// select the kits 'mySelectEvent' is a function in p5.js

function mySelectEvent() {

  if (menu.value() == "beats") {

    kitChosen = "beats";

  } else if (menu.value() == "trap") {

    kitChosen = "trap";

  } else if (menu.value() == "mix") {

    kitChosen = "mix";

  }

  // say which kit is currently selected and playing in console

  console.log("playing kit: " + kitChosen);

}

​

// changes drummer mascot's speed of movement according to BPM

function speedVisualization() {

  // setting new drummingSpeed global 

  let value = slider.value();

  drummingSpeed = value;

  swayingSpeed = value;

}

​