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<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8" />
<title>Colors Palette Generator</title>
<style>
body {
font-family: monospace;
}
fieldset { min-width: auto; float: left; }
.slider_block { min-width: auto; } /* add display: inline-block; for compact mode */
</style>
</head>
<body>
<h1>Colors Palette Generator</h1>
<fieldset>
<legend><b>Offset Options:</b></legend>
<div class="slider_block slider_hoffset">
Color wheel offset: <span id="val_hoffset">0</span><br />
<input type="range" min="0" max="30" value="0" step="5" name="hoffset" id="hoffset" />
</div>
<div class="slider_block slider_soffset">
Saturation offset: <span id="val_soffset">0</span><br />
<input type="range" min="0" max="90" value="35" name="soffset" id="soffset" />
</div>
<div class="slider_block slider_loffset">
Luminance offset: <span id="val_loffset">0</span><br />
<input type="range" min="0" max="80" value="50" name="loffset" id="loffset" />
</div>
</fieldset>
<fieldset>
<legend><b>Square Options:</b></legend>
<div class="slider_block slider_size">
Size: <span id="val_size">0</span><br />
<input type="range" min="1" max="100" value="32" name="size" id="size" />
</div>
<div class="slider_block slider_padding">
Padding: <span id="val_padding">0</span><br />
<input type="range" min="0" max="10" value="1" name="padding" id="padding" />
</div>
</fieldset>
<fieldset>
<legend><b>Block Options:</b></legend>
<div class="slider_block slider_number">
Blocks size: <span id="val_number">0</span><br />
<input type="range" min="0" max="20" value="6" name="number" id="number" />
</div>
<div class="slider_block slider_blocks">
Blocks per line: <span id="val_blocks">0</span><br />
<input type="range" min="2" max="40" value="4" step="2" name="blocks" id="blocks" />
</div>
<div class="slider_block slider_hnumber">
Number of blocks: <span id="val_hnumber">0</span><br />
<input type="range" min="0" max="200" value="16" name="hnumber" id="hnumber" />
</div>
</fieldset>
<fieldset>
<legend><b>Pattern Options:</b></legend>
<div class="radio_block radio_number">
Pattern: <input type="radio" id="pattern_on" name="pattern" value="true">
<label for="pattern_on">On</label>
<input type="radio" id="pattern_off" name="pattern" value="false" checked="checked">
<label for="pattern_off">Off</label>
</div>
<div class="radio_block radio_number">
Color: <input type="radio" id="pattern_color_black" name="pattern_color" value="black" checked="checked">
<label for="pattern_color_black">black</label>
<input type="radio" id="pattern_color_grey" name="pattern_color" value="grey">
<label for="pattern_color_grey">grey</label>
<input type="radio" id="pattern_color_white" name="pattern_color" value="white">
<label for="pattern_color_white">white</label>
</div>
<div class="slider_block slider_dsize">
Dash size: <span id="val_dsize">0</span><br />
<input type="range" min="0" max="32" value="3" step="0.5" name="dsize" id="dsize" />
</div>
<div class="slider_block slider_ssize">
Space size: <span id="val_ssize">0</span><br />
<input type="range" min="0" max="32" value="1" step="0.5" name="ssize" id="ssize" />
</div>
</fieldset>
<fieldset>
<legend><b>About:</b></legend>
<p>
Color palette generator have been made by <br /><a href="https://github.com/multiscan">multiscan</a> &
<a href="https://github.com/ponsfrilus">ponsfrilus</a>.<br /><br />
The full source is available on<br />
<a href="https://github.com/epfl-dojo/colors-palette-generator">epfl-dojo/colors-palette-generator</a>.<br /><br />
Like this generator? Give us some stars: <br />
<iframe src="https://ghbtns.com/github-btn.html?user=epfl-dojo&repo=colors-palette-generator&type=star&count=true" frameborder="0" scrolling="0" width="150" height="20" title="GitHub"></iframe>
</p>
</fieldset>
<div style="clear: both"></div>
<hr size="1" color="#eaeaea" />
<canvas id="canvas"></canvas><br />
<a id="download" download="image.png"><button type="button" onClick="download()">Download</button></a>
</body>
<script>
function doPalette() {
const canvas = document.getElementById("canvas")
const ctx = canvas.getContext("2d")
let hoffset = parseInt(document.getElementById("val_hoffset").innerHTML) // color wheel offset
let soffset = parseInt(document.getElementById("val_soffset").innerHTML) // saturation offset
let loffset = parseInt(document.getElementById("val_loffset").innerHTML) // luminance offset
let size = parseInt(document.getElementById("val_size").innerHTML) // size in pixel of squares
let padding = parseInt(document.getElementById("val_padding").innerHTML) // padding between blocks
let blocks = parseInt(document.getElementById("val_blocks").innerHTML) // total number of big blocks by line
let hnumber = parseInt(document.getElementById("val_hnumber").innerHTML) // total number of big blocks
let number = parseInt(document.getElementById("val_number").innerHTML) // number of square in big blocks
let pattern = document.querySelector('input[name="pattern"]:checked').value
let pattern_color = document.querySelector('input[name="pattern_color"]:checked').value
let dsize = parseFloat(document.getElementById("val_dsize").innerHTML) // dashes size
let ssize = parseFloat(document.getElementById("val_ssize").innerHTML) // spaces size
console.debug(`doPalette options:
hoffset: ${hoffset}, soffset: ${soffset}, loffset: ${loffset},
size: ${size}, padding: ${padding}, number: ${number},
blocks: ${blocks}, hnumber: ${hnumber},
pattern: ${pattern}, pattern_color: ${pattern_color}`)
canvas.width = (size + padding) * number * blocks + size + padding
canvas.height = (size + padding) * number * (hnumber / blocks) + size + padding
for (let h = 0; h < hnumber; h++) {
x0 = (h % blocks) * (size + padding) * number
y0 = Math.floor(h / blocks) * (size + padding) * number
hh = hoffset + (h * 360) / hnumber
for (let s = 0; s < number; s++) {
x = x0 + (size + padding) * s
ss = soffset + (s * (90 - soffset)) / number
for (let l = 0; l < number; l++) {
y = y0 + (size + padding) * l
ll = loffset + (l * (80 - loffset)) / number
ctx.fillStyle = hslToRgbHex(hh, ss, ll)
ctx.fillRect(x, y, size, size)
if (pattern == 'true') {
ctx.beginPath()
ctx.setLineDash([dsize, ssize])
for (let d=1; d <= size; d+=4) {
ctx.moveTo(x+1, y+d)
ctx.lineTo(x+size-1, y+d)
}
ctx.strokeStyle = pattern_color
ctx.stroke()
}
}
}
}
y = canvas.height - size - padding
for (let l = 0; l < number * blocks; l++) {
ll = (l * 100) / (number * blocks)
x = l * (size + padding)
ctx.fillStyle = hslToRgbHex(0, 0, ll)
ctx.fillRect(x, y, size, size)
if (pattern == 'true') {
ctx.beginPath()
ctx.setLineDash([dsize, ssize])
for (let d=1; d <= size; d+=4) {
ctx.moveTo(x+1, y+d)
ctx.lineTo(x+size-1, y+d)
}
ctx.strokeStyle = pattern_color
ctx.stroke()
}
}
x = canvas.width - size - padding
for (let l = 0; l < number * (hnumber / blocks); l++) {
ll = (l * 100) / (number * (hnumber / blocks))
y = l * (size + padding)
ctx.fillStyle = hslToRgbHex(0, 0, ll)
ctx.fillRect(x, y, size, size)
if (pattern == 'true') {
ctx.beginPath()
ctx.setLineDash([dsize, ssize])
for (let d=1; d <= size; d+=4) {
ctx.moveTo(x+1, y+d)
ctx.lineTo(x+size-1, y+d)
}
ctx.strokeStyle = pattern_color
ctx.stroke()
}
}
if (pattern == 'true') {
ctx.beginPath()
ctx.setLineDash([dsize, ssize])
for (let d=1; d <= size; d+=4) {
ctx.moveTo(canvas.width - size - padding, canvas.height - size + d - padding)
ctx.lineTo(canvas.width - padding, canvas.height - size + d - padding)
}
ctx.strokeStyle = pattern_color
ctx.stroke()
}
}
/* https://stackoverflow.com/a/42546234/960623 */
function download() {
var download = document.getElementById("download")
var image = document.getElementById("canvas").toDataURL("image/png").replace("image/png", "image/octet-stream")
download.setAttribute("href", image)
var fileName = `colors-palette
_${parseInt(document.getElementById("val_hoffset").innerHTML)}
_${parseInt(document.getElementById("val_soffset").innerHTML)}
_${parseInt(document.getElementById("val_loffset").innerHTML)}
_${parseInt(document.getElementById("val_size").innerHTML)}
_${parseInt(document.getElementById("val_padding").innerHTML)}
_${parseInt(document.getElementById("val_number").innerHTML)}
_${parseInt(document.getElementById("val_blocks").innerHTML)}
_${parseInt(document.getElementById("val_hnumber").innerHTML)}.png`
download.setAttribute("download", fileName)
}
// color manipulation functions taken from https://github.com/bgrins/TinyColor
function pad2(c) {
return c.length == 1 ? "0" + c : "" + c
}
function rgbToHex(r, g, b) {
var hex = [pad2(Math.round(r).toString(16)), pad2(Math.round(g).toString(16)), pad2(Math.round(b).toString(16))]
return hex.join("")
}
function hslToRgbHex(h, s, l) {
var r, g, b
h = h / 360
s = s / 100
l = l / 100
function hue2rgb(p, q, t) {
if (t < 0) t += 1
if (t > 1) t -= 1
if (t < 1 / 6) return p + (q - p) * 6 * t
if (t < 1 / 2) return q
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6
return p
}
if (s === 0) {
r = g = b = l // achromatic
} else {
var q = l < 0.5 ? l * (1 + s) : l + s - l * s
var p = 2 * l - q
r = hue2rgb(p, q, h + 1 / 3)
g = hue2rgb(p, q, h)
b = hue2rgb(p, q, h - 1 / 3)
}
return "#" + rgbToHex(r * 255, g * 255, b * 255)
}
// Your code to run since DOM is loaded and ready
document.addEventListener("DOMContentLoaded", function (event) {
// sliders
var sliders = document.querySelectorAll('div.slider_block')
sliders.forEach((e,i) => {
let spa = e.querySelector('span')
let inp = e.querySelector('input')
spa.innerHTML = inp.value // Display the default slider value
inp.oninput = () => { // Update the current slider value (each time you drag the slider handle)
spa.innerHTML = inp.value
doPalette()
}
})
// radios
var radios = document.querySelectorAll('input[type=radio]')
for (let i=0, rLen=radios.length; i<rLen; i++) {
radios[i].oninput = function () { doPalette() }
}
// load the palette on first load
doPalette()
})
</script>
</html>