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jeremyabel/README.md

Last active August 29, 2015 14:19
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HSL interpolation
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index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
body {
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
.space {
position: absolute;
}
.space div {
position: absolute;
top: 0;
left: 20px;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
var spaces = [
{name: "HSL", interpolate: d3.interpolateHsl},
{name: "RGB", interpolate: d3.interpolateRgb}
];
var y = d3.scale.ordinal()
.domain(spaces.map(function(d) { return d.name; }))
.rangeRoundBands([0, 500], .09);
var margin = y.range()[0],
width = 960 - margin - margin,
height = y.rangeBand();
var color = d3.scale.linear()
.domain([0, width])
.range(["hsl(62,100%,90%)", "hsl(222,30%,20%)"]);
var space = d3.select("body").selectAll(".space")
.data(spaces)
.enter().append("div")
.attr("class", "space")
.style("width", width + "px")
.style("height", height + "px")
.style("left", margin + "px")
.style("top", function(d, i) { return y(d.name) + "px"; });
space.append("canvas")
.attr("width", width)
.attr("height", 1)
.style("width", width + "px")
.style("height", height + "px")
.each(render);
space.append("div")
.style("line-height", height + "px")
.text(function(d) { return d.name; });
function render(d) {
var context = this.getContext("2d"),
image = context.createImageData(width, 1);
color.interpolate(d.interpolate);
for (var i = 0, j = -1, c; i < width; ++i) {
c = d3.rgb(color(i));
image.data[++j] = c.r;
image.data[++j] = c.g;
image.data[++j] = c.b;
image.data[++j] = 255;
}
context.putImageData(image, 0, 0);
}
</script>
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