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HCL 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; | |
| } | |
| #c .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="c"> | |
| <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}, | |
| c: {scale: d3.scale.linear().domain([0, 100]).range([0, width]), x: width / 2}, | |
| l: {scale: d3.scale.linear().domain([0, 150]).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.hcl( | |
| channels.h.scale.invert(channels.h.x), | |
| channels.c.scale.invert(channels.c.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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