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HSL Color Picker
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<style> | |
.axis path, | |
.axis line { | |
fill: none; | |
stroke: #000; | |
shape-rendering: crispEdges; | |
} | |
.axis text { | |
font: 10px sans-serif; | |
} | |
#s .tick:last-of-type text, | |
#l .tick:last-of-type text { | |
display: none; | |
} | |
.channel canvas { | |
float: left; | |
margin: 40px 30px 0 30px; | |
width: 900px; | |
height: 90px; | |
} | |
</style> | |
<div class="channel" id="h"> | |
<canvas width="900" height="1"></canvas> | |
<svg width="960" height="20"><g class="axis" transform="translate(30,.5)"></g></svg> | |
</div> | |
<div class="channel" id="s"> | |
<canvas width="900" height="1"></canvas> | |
<svg width="960" height="20"><g class="axis" transform="translate(30,.5)"></g></svg> | |
</div> | |
<div class="channel" id="l"> | |
<canvas width="900" height="1"></canvas> | |
<svg width="960" height="20"><g class="axis" transform="translate(30,.5)"></g></svg> | |
</div> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
var white = d3.rgb("white"), | |
black = d3.rgb("black"), | |
width = d3.select("canvas").property("width"); | |
var channels = { | |
h: {scale: d3.scale.linear().domain([0, 360]).range([0, width]), x: width / 2}, | |
s: {scale: d3.scale.linear().domain([0, 1]).range([0, width]), x: width / 2}, | |
l: {scale: d3.scale.linear().domain([0, 1]).range([0, width]), x: width / 2} | |
}; | |
var channel = d3.selectAll(".channel") | |
.data(d3.entries(channels)); | |
channel.select(".axis") | |
.each(function(d) { d3.select(this).call(d3.svg.axis().scale(d.value.scale).orient("bottom")); }) | |
.append("text") | |
.attr("x", width) | |
.attr("y", 9) | |
.attr("dy", ".72em") | |
.style("text-anchor", "middle") | |
.style("text-transform", "uppercase") | |
.text(function(d) { return d.key; }); | |
var canvas = channel.select("canvas") | |
.call(d3.behavior.drag().on("drag", dragged)) | |
.each(render); | |
function dragged(d) { | |
d.value.x = Math.max(0, Math.min(this.width - 1, d3.mouse(this)[0])); | |
canvas.each(render); | |
} | |
function render(d) { | |
var width = this.width, | |
context = this.getContext("2d"), | |
image = context.createImageData(width, 1), | |
i = -1; | |
var current = d3.hsl( | |
channels.h.scale.invert(channels.h.x), | |
channels.s.scale.invert(channels.s.x), | |
channels.l.scale.invert(channels.l.x) | |
); | |
for (var x = 0, v, c; x < width; ++x) { | |
if (x === d.value.x) { | |
c = white; | |
} else if (x === d.value.x - 1) { | |
c = black; | |
} else { | |
current[d.key] = d.value.scale.invert(x); | |
c = d3.rgb(current); | |
} | |
image.data[++i] = c.r; | |
image.data[++i] = c.g; | |
image.data[++i] = c.b; | |
image.data[++i] = 255; | |
} | |
context.putImageData(image, 0, 0); | |
} | |
</script> |
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