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/**
* @license
* Lodash lodash.com/license | Underscore.js 1.8.3 underscorejs.org/LICENSE
*/
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<!DOCTYPE html>
<meta charset='utf-8'>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="style.css">
<h1>Color Curves</h1>
<p>Use <a href='https://www.vis4.net/blog/2013/09/mastering-multi-hued-color-scales/'>Bézier curves</a> through different color spaces to create a scale from the colors below. Based on Gregor Aisch's <a href='https://gka.github.io/palettes'>Color Palette Helper</a>.
<p>Open TKTK in a new window to see your data transformed by the color scale.
<div class='color-input'></div>
<br>
<div class='bands'></div>
<div class='spaces'></div>
<br>
<div class='band'></div>
<div>
<label for='numTicks'>Number of output colors: </label>
<input type='number' class='numTicks' name='numTicks' min='3' max='255'>
</div>
<br>
<div class='output-colors'></div>
<script src='d3_.js'></script>
<script src='init-band.js'></script>
<script src='init-color-input.js'></script>
<script src='init-line.js'></script>
<script src='init-num-ticks.js'></script>
<script src='init-output-colors.js'></script>
<script src='init-spaces.js'></script>
<script src='init-space-band.js'></script>
<script src='init-util.js'></script>
<script src='script.js'></script>
window.initBand = function(){
var sel = d3.select('.band').html('')
var c = d3.conventions({
sel,
height: 100,
margin: {left: 0, right: 0}
})
var s = Math.floor(c.width/state.numTicks)
var rectSel = c.svg.appendMany('rect', d3.range(state.numTicks))
.at({
height: c.height,
width: s,
x: i => s*i
})
function render(tickColors){
rectSel.st({fill: (d, i) => tickColors[i]})
}
return {render}
}
window.initColorInput = function(){
var sel = d3.select('.color-input').html('')
var padding = 10
var wordSpacing = 30
var fontSize = 14
var charWidth = calcCharWidth()
var inputSel = sel.append('input')
.st({padding, 'word-spacing': wordSpacing + 'px', fontSize, width: 1012})
.at({spellcheck: 'false'})
.on('change', onTextChange)
.on('keyup', () => {
if (d3.event.key == 'Enter') onTextChange()
})
var inputNode = inputSel.node()
function onTextChange(){
state.colors = inputNode.value.trim().split(' ').filter(d => d).map(d3.color)
window.render()
}
var colorSel = sel.append('div')
.st({marginLeft: 10, marginTop: 5})
function render(){
inputNode.value = state.colors.map(util.formatHex).join(' ')
var colorsSel = colorSel.selectAll('input')
.data(state.colors)
colorsSel.exit().remove()
colorsSel = colorsSel.enter().append('input')
.at({type: 'color'})
.st({width: charWidth*8.4, marginRight: wordSpacing, padding: 0})
.on('input', function(d, i){
state.colors[i] = d3.color(this.value)
window.render()
})
.merge(colorsSel)
.at({value: util.formatHex})
}
return {render}
function calcCharWidth(){
var spanSel = d3.select('body').selectAppend('span').text('x')
.st({fontFamily: 'monospace', fontSize, position: 'absolute', top: -100})
return spanSel.node().offsetWidth
}
}
window.initLine = function(space, type, sel){
var typeI = space.key.indexOf(type)
sel = sel.append('div')
.st({marginLeft: 10, display: 'inline-block', textAlign: 'center'})
var type2str = {l: 'Lightness', s: 'Saturation', h: 'Hue', c: 'Chroma', r: 'Red', g: 'Green', b: 'Blue'}
sel.append('div')
.html(space.ppKeys ? space.ppKeys[typeI] : type2str[type] || type)
.st({fontSize: 12, color: '#333'})
if (type == 'l') sel.lower()
var c = d3.conventions({
sel,
width: 290,
height: 120,
margin: {top: 0, bottom: 28, left: 25}
})
c.svg.append('rect').at({width: c.width, height: c.height, fill: '#eee'})
c.x.interpolate(d3.interpolateRound)
c.y.domain([space.min ? space.min[typeI] : 0, space.max[typeI]])
.clamp(1)
.interpolate(d3.interpolateRound)
c.yAxis.ticks(5)
c.xAxis.ticks(5).tickValues([0, .25, .5, .75, 1])
d3.drawAxis(c)
c.svg.selectAll('.y .tick')
.append('path').at({d: 'M 0 0 H ' + c.width, stroke: '#fff', strokeWidth: 1})
c.svg.selectAll('.y text').at({x: -3})
c.svg.selectAll('.x .tick')
.append('path').at({d: 'M 0 0 V -' + c.height, stroke: '#fff', strokeWidth: 1})
c.svg.selectAll('.x text').at({y: 2})
var pathSel = c.svg.append('path')
.at({stroke: '#000', fill: 'none'})
var line = d3.line()
.curve(d3.curveStep)
.x((d, i) => c.x(i/(state.numTicks - 1)))
.y(d => c.y(d[type]) || 0)
.defined(d => isFinite(c.y(d[type])))
var cy = i => c.y(space.colors[i][type]) || 0
var drag = d3.drag()
.on('drag', function(i){
var [mx, my] = d3.mouse(c.svg.node())
var tmp = space.colors[i]
tmp[type] = c.y.invert(my)
state.colors[i] = tmp
window.render()
})
// .subject(i => ({y: cy(i)}))
var circleSel = c.svg.appendMany('circle', d3.range(state.colors.length))
.at({
r: 7,
cx: i => i/(state.colors.length - 1)*c.width,
fill: 'rgba(0,0,0,0)',
stroke: '#000',
})
.st({cursor: 'pointer',})
.call(drag)
function render(){
pathSel.at({d: line(space.tickColors)})
circleSel.at({cy})
}
return {render}
}
window.initNumColors = function(){
var sel = d3.select('.numTicks')
.on('input', d => {
state.numTicks = d3.clamp(3, +node.value, 255*2)
window.band = initBand()
d3.values(spaces).forEach(d => d.initBands())
render()
})
.at({value: state.numTicks})
var node = sel.node()
}
window.initOutputColors = function(){
var render = _.debounce(tickColors => {
d3.select('.output-colors')
.text('[' + tickColors.map(d => `'${util.formatHex(d)}'`).join(', ') + ']')
}, 500)
return {render}
}
window.initSpaceBand = function(space, type, sel){
sel
.classed('space-band', 1)
.datum({space, type})
.on('click', d => {
state.type = type
state.space = space.keyOrig
console.log(state)
window.render()
})
var c = d3.conventions({
sel,
width: 255*2,
height: 30,
margin: {bottom: 0, top: 10, left: 0, right: 5}
})
c.svg.append('text')
.text(space.ppKey + ' ' + type)
.at({fontSize: 12, y: -2})
var s = Math.floor(c.width/state.numTicks)
var rectSel = c.svg.appendMany('rect', d3.range(state.numTicks))
.at({
height: c.height,
width: s,
x: i => s*i
})
function render(){
var scale = type == 'basis' ?
space.basisInterpolate(state.colors) :
space.linearInterpolate(state.colors)
var tickColors = d3.range(state.numTicks).map(i => scale(i/state.numTicks))
rectSel.st({fill: (d, i) => tickColors[i]})
}
return {render}
}
window.initSpaces = function(){
var spaces = {
lab: {
max: [100, 160, 160],
min: [0, -160, -160],
link: 'https://en.wikipedia.org/wiki/CIELAB_color_space#Cylindrical_representation:_CIELCh_or_CIEHLC',
ppKey: 'L*a*b*',
ppKeys: ['Lightness', 'Red / Green', 'Blue / Yellow']
},
hcl: {
max: [360, 230, 100],
link: 'https://en.wikipedia.org/wiki/HCL_color_space',
},
cubehelix: {
max: [360, 2, 1],
link: 'http://www.mrao.cam.ac.uk/~dag/CUBEHELIX/',
ppKey: 'Cubehelix',
key: 'hsl'
},
hsl: {
max: [360, 1, 1],
link: 'https://en.wikipedia.org/wiki/HSL_and_HSV',
},
rgb: {
max: [255, 255, 255],
link: 'https://en.wikipedia.org/wiki/Color_space',
},
}
var spacesSel = d3.select('.spaces').html('')
var bandsSel = d3.select('.bands').html('')
d3.entries(spaces).forEach(({key, value}) => {
var space = value
space.fn = d3[key]
space.key = space.key || key
space.keyOrig = key
space.ppKey = space.ppKey || key.toUpperCase()
space.interpolate = d3['interpolate' + key[0].toUpperCase() + key.slice(1)]
space.sel = spacesSel.append('div.space')
space.sel.append('div.space-label')
.append('a').text(space.ppKey).at({href: space.link})
var lineSel = space.sel.append('div.lines')
space.lines = space.key.split('').map(type => initLine(space, type, lineSel))
space.basisInterpolate = createBasisInterpolate(space)
space.linearInterpolate = (colors) => d3.scaleLinear()
.domain(colors.map((d, i) => i/(colors.length - 1)))
.range(colors)
.interpolate(space.interpolate)
var bandSel = bandsSel.append('div')
space.initBands = () => {
bandSel.html('')
space.basisBand = initSpaceBand(space, 'basis', bandSel.append('div'))
space.linearBand = initSpaceBand(space, 'linear', bandSel.append('div'))
}
space.initBands()
})
// https://github.com/d3/d3-interpolate/blob/main/src/rgb.js#L54
function createBasisInterpolate(space){
var [aKey, bKey, cKey] = space.key.split('')
return function(colors) {
var n = colors.length,
a = new Array(n),
b = new Array(n),
c = new Array(n),
i, color;
for (i = 0; i < n; ++i) {
color = space.fn(colors[i])
a[i] = color[aKey] || 0
b[i] = color[bKey] || 0
c[i] = color[cKey] || 0
}
a = d3.interpolateBasis(a)
b = d3.interpolateBasis(b)
c = d3.interpolateBasis(c)
color.opacity = 1
return function(t) {
color[aKey] = a(t)
color[bKey] = b(t)
color[cKey] = c(t)
return color + ''
}
}
}
return spaces
}
window.initUtil = function(){
var params = (function(){
var url = new URL(window.location)
var searchParams = new URLSearchParams(url.search)
var rv = {}
var get = key => {
return searchParams.get(key)
}
var set = (key, value) => {
searchParams.set(key, value)
url.search = searchParams.toString()
history.replaceState(null, '', url)
}
var setAll = _.debounce(() => {
set('colors', state.colors.map(formatHex).join('-').replaceAll('#', ''))
set('numTicks', state.numTicks)
set('space', state.space)
set('type', state.type)
}, 200)
var getAll = () => {
var colors = get('colors') ?
get('colors').split('-').map(d => d3.color('#' + d)) :
['#00429d', '#96ffea', '#cccccc', '#ff005e', '#93003a'].map(d => d3.color(d))
var numTicks = +get('numTicks') || 255
var space = get('space') || 'lab'
var type = get('type') || 'basis'
return {colors, numTicks, space, type}
}
return {get, set, setAll, getAll}
})()
// https://github.com/d3/d3-color
function formatHex(d){
d = d3.color(d)
return "#" + hex(d.r) + hex(d.g) + hex(d.b)
function hex(value) {
value = Math.max(0, Math.min(255, Math.round(value) || 0))
return (value < 16 ? '0' : '') + value.toString(16)
}
}
try {
var bc = new BroadcastChannel('CustomGray')
function broadcastScale(scale){
var n = 1024
bc.postMessage(d3.range(n).map(i => scale(i/n)))
}
} catch {
var broadcastScale = () => null
}
return {params, formatHex, broadcastScale}
}
window.init = function(){
window.util = initUtil()
window.state = window.state || util.params.getAll()
window.prevState = window.state
initNumColors()
window.colorInput = initColorInput()
window.outputColors = initOutputColors()
window.spaces = initSpaces()
window.band = initBand()
window.render()
}
window.render = function(){
if (prevState.colors.length != state.colors.length){
window.spaces = initSpaces()
window.band = initBand()
}
var scale = spaces[state.space][state.type + 'Interpolate'](state.colors)
util.broadcastScale(scale)
var tickColors = d3.range(state.numTicks).map(i => scale(i/state.numTicks))
band.render(tickColors)
outputColors.render(tickColors)
d3.values(spaces).forEach(space => {
space.colors = state.colors.map(d => space.fn(d))
space.tickColors = tickColors.map(d => space.fn(d))
space.lines.forEach(d => d.render())
space.basisBand.render()
space.linearBand.render()
})
d3.selectAll('.space-band')
.classed('active', d => d.space.keyOrig == state.space && d.type == state.type)
colorInput.render()
util.params.setAll()
window.prevState = JSON.parse(JSON.stringify(window.state))
}
init()
window.__onHotServer = () => {
console.clear()
init()
}
body{
margin: 10px auto;
width: 1060px;
font-family: menlo, Consolas, 'Lucida Console', monospace;
min-height: 1200px;
}
input{
font-family: menlo, Consolas, 'Lucida Console', monospace;
padding: 10px;
font-size: 14px;
}
.tooltip {
top: -1000px;
position: fixed;
padding: 10px;
background: rgba(255, 255, 255, .90);
border: 1px solid lightgray;
pointer-events: none;
}
.tooltip-hidden{
opacity: 0;
transition: all .3s;
transition-delay: .1s;
}
@media (max-width: 590px){
div.tooltip{
bottom: -1px;
width: calc(100%);
left: -1px !important;
right: -1px !important;
top: auto !important;
width: auto !important;
}
}
svg{
overflow: visible;
user-select: none;
}
.axis text{
fill: #aaa;
}
.domain{
display: none;
}
.axis line{
display: none;
}
text{
pointer-events: none;
text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, 0 -1px 0 #fff, -1px 0 0 #fff;
}
.hsv-lines{
user-select: none;
}
.spaces{
margin-left: 20px;
user-select: none;
}
.bands{
user-select: none;
}
.space{
margin-bottom: -30px;
}
.space-label{
transform-origin: center;
transform: translate(-120px, 100px) rotate(-90deg);
position: relative;
z-index: 1000;
display: inline-block;
width: 200px !important;
height: 0px;
text-align: center;
margin-bottom: -20px;
}
.bands > div{
width: 1060px;
}
.space-band{
display: inline-block;
margin-right: 10px;
margin-bottom: 10px;
cursor: pointer;
}
.space-band text{
fill: #333;
}
.space-band.active{
}
.space-band.active text{
fill: #000;
font-weight: 900;
/*text-decoration: underline;*/
}
p{
max-width: 600px;
line-height: 1.4em;
}
input[type="color"] {
border: 0;
padding: 0;
border-color: #fff !important;
background: #fff;
height: 30px;
}
.output-colors{
padding: 10px;
background: #eee;
font-size: 12px;
color: #555;
}
a{
color: #000;
}
.numTicks{
text-align: center;
}
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