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// p5.js drum machine
// 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;
}