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colour-picker.js
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colour-picker.js
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/*
//
/ Knobs JS
/
/ Credits: https://www.youtube.com/watch?v=ELUSz0L8vTA
/ https://css-tricks.com/converting-color-spaces-in-javascript/
//
*/
// Get reference to <body> element to change background colour with knobs
const body = document.querySelector('#body');
// Create array of knob elements
let knobs = document.querySelectorAll('.knob');
// Global scope
var rad;
var deg;
let buffer;
let intBuffer;
var hexOutputValue = '#ff0000';
var hslOutputValue = 'hsl(0, 100%, 50%)';
var rgbOutputValue = 'rgb(255, 0, 0)';
var pos360;
//
// Selectors
//
// Buttons
const hslButton = document.querySelector('#hsl-button');
const rgbButton = document.querySelector('#rgb-button');
// Knob text
const knob1Text = document.querySelector('#knob1-text');
const knob2Text = document.querySelector('#knob2-text');
const knob3Text = document.querySelector('#knob3-text');
// Knob values
const knob1Value = document.querySelector('#knob1-value');
const knob2Value = document.querySelector('#knob2-value');
const knob3Value = document.querySelector('#knob3-value');
// Outputs
const hexOutput = document.querySelector('#hex-output');
const hslOutput = document.querySelector('#hsl-output');
const rgbOutput = document.querySelector('#rgb-output');
// Mode
var mode = 'hsl';
var hue = 0;
var saturation = 100;
var lightness = 50;
var red = 255;
var green = 0;
var blue = 0;
// Maintain colour when switching modes
function toggleKnobs() {
if (mode == 'rgb') {
buffer = rgbOutputValue;
buffer = buffer.replace('rgb(', '').replaceAll(' ','').replace(')', '');
buffer = buffer.split(',');
intBuffer = buffer.map((item) => {
return parseInt(item);
});
red = intBuffer[0];
green = intBuffer[1];
blue = intBuffer[2];
}
if (mode == 'hsl') {
buffer = hslOutputValue;
buffer = buffer.replace('hsl(', '').replaceAll(' ', '').replaceAll('%', '').replace(')', '');
buffer = buffer.split(',');
intBuffer = buffer.map((item) => {
return parseInt(item);
});
hue = intBuffer[0];
saturation = intBuffer[1];
lightness = intBuffer[2];
}
knobs.forEach(function(knob, i=0) {
knob.style.transform = `rotate(${intBuffer[i]+10}deg)`;
i++;
});
}
// Switch mode
hslButton.addEventListener('click', function() {
if (mode == 'rgb') {
mode = 'hsl';
console.log('Mode changed to ' + mode);
toggleKnobs();
knob1Text.textContent = 'Hue';
knob2Text.textContent = 'Saturation';
knob3Text.textContent = 'Lightness';
knob1Value.textContent = `${hue}`;
knob2Value.textContent = `${saturation}%`;
knob3Value.textContent = `${lightness}%`;
body.style.backgroundColor = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
rgbButton.classList.remove('selected');
hslButton.classList.add('selected');
}
});
rgbButton.addEventListener('click', function() {
if (mode == 'hsl') {
mode = 'rgb';
console.log('Mode changed to ' + mode);
toggleKnobs();
knob1Text.textContent = 'Red';
knob2Text.textContent = 'Green';
knob3Text.textContent = 'Blue';
knob1Value.textContent = `${red}`;
knob2Value.textContent = `${green}`;
knob3Value.textContent = `${blue}`;
body.style.backgroundColor = `rgb(${red}, ${green}, ${blue})`;
hslButton.classList.remove('selected');
rgbButton.classList.add('selected');
}
});
//
// Converters
//
// RGB to hex
function rgbToHex(r, g, b) {
r = r.toString(16);
g = g.toString(16);
b = b.toString(16);
if (r.length == 1) {
r = "0" + r;
}
if (g.length == 1) {
g = "0" + g;
}
if (b.length == 1) {
b = "0" + b;
}
return "#" + r + g + b;
}
// HSL to hex
function hslToHex(h, s, l) {
s /= 100;
l /= 100;
let c = (1 - Math.abs(2 * l - 1)) * s,
x = c * (1 - Math.abs((h / 60) % 2 - 1)),
m = l - c/2,
r = 0,
g = 0,
b = 0;
if (0 <= h && h < 60) {
r = c; g = x; b = 0;
} else if (60 <= h && h < 120) {
r = x; g = c; b = 0;
} else if (120 <= h && h < 180) {
r = 0; g = c; b = x;
} else if (180 <= h && h < 240) {
r = 0; g = x; b = c;
} else if (240 <= h && h < 300) {
r = x; g = 0; b = c;
} else if (300 <= h && h < 360) {
r = c; g = 0; b = x;
}
r = Math.round((r + m) * 255).toString(16);
g = Math.round((g + m) * 255).toString(16);
b = Math.round((b + m) * 255).toString(16);
if (r.length == 1) {
r = "0" + r;
}
if (g.length == 1) {
g = "0" + g;
}
if (b.length == 1) {
b = "0" + b;
}
return "#" + r + g + b;
}
// HSL to RGB
function hslToRGB(h, s, l) {
s /= 100;
l /= 100;
let c = (1 - Math.abs(2 * l - 1)) * s,
x = c * (1 - Math.abs((h / 60) % 2 - 1)),
m = l - c/2,
r = 0,
g = 0,
b = 0;
if (0 <= h && h < 60) {
r = c; g = x; b = 0;
} else if (60 <= h && h < 120) {
r = x; g = c; b = 0;
} else if (120 <= h && h < 180) {
r = 0; g = c; b = x;
} else if (180 <= h && h < 240) {
r = 0; g = x; b = c;
} else if (240 <= h && h < 300) {
r = x; g = 0; b = c;
} else if (300 <= h && h < 360) {
r = c; g = 0; b = x;
}
r = Math.round((r + m) * 255);
g = Math.round((g + m) * 255);
b = Math.round((b + m) * 255);
return "rgb(" + r + "," + g + "," + b + ")";
}
// RGB to HSL
function rgbToHSL(r, g, b) {
r /= 255;
g /= 255;
b /= 255;
let cmin = Math.min(r, g, b),
cmax = Math.max(r, g, b),
delta = cmax - cmin,
h = 0,
s = 0,
l = 0;
if (delta == 0) {
h = 0;
} else if (cmax == r) {
h = ((g - b) / delta) % 6;
} else if (cmax == g) {
h = (b - r) / delta + 2;
} else {
h = (r - g) / delta + 4;
}
h = Math.round(h * 60);
if (h < 0) {
h += 360;
}
l = (cmax + cmin) / 2;
s = delta == 0 ? 0 : delta / (1 - Math.abs(2 * l - 1));
s = +(s * 100).toFixed(1);
l = +(l * 100).toFixed(1);
return "hsl(" + h + ", " + s + "%, " + l + "%)";
}
// Copy to clipboard
var copyButtons = document.querySelectorAll('.copy');
copyButtons.forEach(function(button) {
button.addEventListener('click', function() {
switch(button) {
case copyButtons[0]:
var copyText = document.querySelector("#hex-output");
navigator.clipboard.writeText(copyText.textContent);
button.textContent = 'copied!';
setTimeout(function(){button.textContent = 'COPY';}, 1000);
break;
case copyButtons[1]:
var copyText = document.querySelector("#hsl-output");
navigator.clipboard.writeText(copyText.textContent);
button.textContent = 'copied!';
setTimeout(function(){button.textContent = 'COPY';}, 1000);
break;
case copyButtons[2]:
var copyText = document.querySelector("#rgb-output");
navigator.clipboard.writeText(copyText.textContent);
button.textContent = 'copied!';
setTimeout(function(){button.textContent = 'COPY';}, 1000);
break;
}
});
});
// Calculate the position of the little white knob in degrees, in a circle around the knob center
function calculateDegree(e, knob) {
// Get knob centers
var x1 = knob.offsetLeft + knob.offsetWidth / 2;
var y1 = knob.offsetTop + knob.offsetHeight / 2;
const x2 = e.clientX;
const y2 = e.clientY;
const deltaX = x1 - x2;
const deltaY = y1 - y2;
rad = Math.atan2(deltaY, deltaX);
deg = rad * (180 / Math.PI);
pos360 = Math.floor(deg - 90);
if (deg >= -180 && deg <= 90) {
pos360 += 360;
}
console.log('rad: ' + rad);
console.log('deg: ' + deg);
console.log('pos360: ' + pos360);
return deg;
}
// Loop over knobs, add event listeners, give output
knobs.forEach(function(knob) {
knob.addEventListener('mousedown', function () {
knob.addEventListener('mousemove', rotate);
function rotate(e) {
const result = Math.floor(calculateDegree(e, knob) - 90);
switch(knob) {
case knobs[0]:
console.log('rotating first knob');
if (mode == 'hsl') {
hue = pos360;
knob1Value.textContent = `${hue}`;
console.log('hue: ' + hue);
body.style.backgroundColor = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
// Outputs
hexOutputValue = hslToHex(hue, saturation, lightness);
hexOutput.textContent = hexOutputValue;
hslOutputValue = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
hslOutput.textContent = hslOutputValue;
rgbOutputValue = hslToRGB(hue, saturation, lightness);
rgbOutput.textContent = rgbOutputValue;
} else if (mode == 'rgb') {
red = Math.floor(pos360 * 255 / 360);
knob1Value.textContent = `${red}`;
console.log('red: ' + red);
body.style.backgroundColor = `rgb(${red}, ${green}, ${blue})`;
// Outputs
hexOutputValue = rgbToHex(red, green, blue);
hexOutput.textContent = hexOutputValue;
hslOutputValue = rgbToHSL(red, green, blue);
hslOutput.textContent = hslOutputValue;
rgbOutputValue = `rgb(${red}, ${green}, ${blue})`;
rgbOutput.textContent = rgbOutputValue;
}
break;
case knobs[1]:
console.log('rotating second knob');
if (mode == 'hsl') {
saturation = -Math.floor(pos360 * 100 / 360) + 100;
knob2Value.textContent = `${saturation}%`;
console.log('saturation: ' + saturation);
body.style.backgroundColor = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
// Outputs
hexOutputValue = hslToHex(hue, saturation, lightness);
hexOutput.textContent = hexOutputValue;
hslOutputValue = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
hslOutput.textContent = hslOutputValue;
rgbOutputValue = hslToRGB(hue, saturation, lightness);
rgbOutput.textContent = rgbOutputValue;
} else if (mode == 'rgb') {
green = Math.floor(pos360 * 255 / 360);
knob2Value.textContent = `${green}`;
console.log('green: ' + green);
body.style.backgroundColor = `rgb(${red}, ${green}, ${blue})`;
// Outputs
hexOutputValue = rgbToHex(red, green, blue);
hexOutput.textContent = hexOutputValue;
hslOutputValue = rgbToHSL(red, green, blue);
hslOutput.textContent = hslOutputValue;
rgbOutputValue = `rgb(${red}, ${green}, ${blue})`;
rgbOutput.textContent = rgbOutputValue;
}
break;
case knobs[2]:
console.log('rotating third knob');
if (mode == 'hsl') {
lightness = Math.floor((result + 180) * 100 / 360);
if (pos360 >= 90 && pos360 <= 180 && deg != 180) {
lightness += 100;
}
knob3Value.textContent = `${lightness}%`;
console.log('lightness: ' + lightness);
body.style.backgroundColor = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
// Outputs
hexOutputValue = hslToHex(hue, saturation, lightness);
hexOutput.textContent = hexOutputValue;
hslOutputValue = `hsl(${hue}, ${saturation}%, ${lightness}%)`;
hslOutput.textContent = hslOutputValue;
rgbOutputValue = hslToRGB(hue, saturation, lightness);
rgbOutput.textContent = rgbOutputValue;
} else if (mode == 'rgb') {
blue = Math.floor(pos360 * 255 / 360);
knob3Value.textContent = `${blue}`;
console.log('blue: ' + blue);
body.style.backgroundColor = `rgb(${red}, ${green}, ${blue})`;
// Outputs
hexOutputValue = rgbToHex(red, green, blue);
hexOutput.textContent = hexOutputValue;
hslOutputValue = rgbToHSL(red, green, blue);
hslOutput.textContent = hslOutputValue;
rgbOutputValue = `rgb(${red}, ${green}, ${blue})`;
rgbOutput.textContent = rgbOutputValue;
}
break;
default:
console.log('Select a knob');
}
knob.style.transform = `rotate(${result}deg)`;
console.log('result: ' + result);
console.log('\n');
}
knob.addEventListener('mouseup', function () {
knob.removeEventListener('mousemove', rotate);
});
});
});