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Last active August 29, 2015 14:03
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HCL linear rainbow scales (for d3)
Raw
index.coffee
hcl_linear_rainbow = () ->
# H and L are linear, C is quadratic
domain = [0,1]
hue_range = [340, 340-480]
chroma_range = [0, 40]
luminance_range = [0, 100]
scale = (x) ->
ext = domain[1]-domain[0]
xn = (x-domain[0]) / ext
return d3.hcl(hue_range[0] + (hue_range[1]-hue_range[0])*xn, chroma_range[0] + (chroma_range[1]-chroma_range[0]) * (1 - Math.pow(1 - 2*xn, 2) ), luminance_range[0] + (luminance_range[1]-luminance_range[0]) *xn)
scale.domain = (x) ->
return domain if(!arguments.length)
domain = x
return scale
scale.hue_range = (x) ->
return hue_range if(!arguments.length)
hue_range = x
return scale
scale.chroma_range = (x) ->
return chroma_range if(!arguments.length)
chroma_range = x
return scale
scale.luminance_range = (x) ->
return luminance_range if(!arguments.length)
luminance_range = x
return scale
return scale
scales = [
hcl_linear_rainbow(),
hcl_linear_rainbow().hue_range([340-480,340]).luminance_range([100,0]),
hcl_linear_rainbow().hue_range([0,0]),
hcl_linear_rainbow().hue_range([0,0+50]),
hcl_linear_rainbow().hue_range([0,0+100]),
hcl_linear_rainbow().hue_range([90,90+180]),
hcl_linear_rainbow().hue_range([90,90+180]).luminance_range([5,95]).chroma_range([10,40]),
hcl_linear_rainbow().hue_range([-90,-90+180]),
hcl_linear_rainbow().hue_range([-90,-90+180]).chroma_range([0,35]),
hcl_linear_rainbow().hue_range([-90,-90+180]).chroma_range([0,20])
]
scales.forEach (scale) -> scale.domain([0,255])
n = scales.length
svg = d3.select('svg')
width = svg.node().getBoundingClientRect().width - 20
height = svg.node().getBoundingClientRect().height - 10
palettes = svg.selectAll('.palette')
.data(scales)
.enter().append('g')
.attr
class: 'palette'
transform: (d,i) -> "translate(10,#{10+i*height/n})"
palettes.selectAll('.band')
.data(d3.range(256))
.enter().append('rect')
.attr
class: 'band'
x: (d,i) -> i*width/256
width: width/256
height: height/n-10
fill: (d) -> d3.select(this.parentNode).datum()(d)
Raw
index.css
html, body {
padding: 0;
margin: 0;
}
svg {
background: white;
}
.band {
shape-rendering: crispEdges;
}
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="description" content="HCL linear rainbow scales (for d3)" />
<title>HCL linear rainbow scales (for d3)</title>
<link rel="stylesheet" href="index.css">
<script src="http://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<svg height="500" width="960"></svg>
<script src="index.js"></script>
</body>
</html>
Raw
index.js
(function() {
var hcl_linear_rainbow, height, n, palettes, scales, svg, width;
hcl_linear_rainbow = function() {
var chroma_range, domain, hue_range, luminance_range, scale;
domain = [0, 1];
hue_range = [340, 340 - 480];
chroma_range = [0, 40];
luminance_range = [0, 100];
scale = function(x) {
var ext, xn;
ext = domain[1] - domain[0];
xn = (x - domain[0]) / ext;
return d3.hcl(hue_range[0] + (hue_range[1] - hue_range[0]) * xn, chroma_range[0] + (chroma_range[1] - chroma_range[0]) * (1 - Math.pow(1 - 2 * xn, 2)), luminance_range[0] + (luminance_range[1] - luminance_range[0]) * xn);
};
scale.domain = function(x) {
if (!arguments.length) {
return domain;
}
domain = x;
return scale;
};
scale.hue_range = function(x) {
if (!arguments.length) {
return hue_range;
}
hue_range = x;
return scale;
};
scale.chroma_range = function(x) {
if (!arguments.length) {
return chroma_range;
}
chroma_range = x;
return scale;
};
scale.luminance_range = function(x) {
if (!arguments.length) {
return luminance_range;
}
luminance_range = x;
return scale;
};
return scale;
};
scales = [hcl_linear_rainbow(), hcl_linear_rainbow().hue_range([340 - 480, 340]).luminance_range([100, 0]), hcl_linear_rainbow().hue_range([0, 0]), hcl_linear_rainbow().hue_range([0, 0 + 50]), hcl_linear_rainbow().hue_range([0, 0 + 100]), hcl_linear_rainbow().hue_range([90, 90 + 180]), hcl_linear_rainbow().hue_range([90, 90 + 180]).luminance_range([5, 95]).chroma_range([10, 40]), hcl_linear_rainbow().hue_range([-90, -90 + 180]), hcl_linear_rainbow().hue_range([-90, -90 + 180]).chroma_range([0, 35]), hcl_linear_rainbow().hue_range([-90, -90 + 180]).chroma_range([0, 20])];
scales.forEach(function(scale) {
return scale.domain([0, 255]);
});
n = scales.length;
svg = d3.select('svg');
width = svg.node().getBoundingClientRect().width - 20;
height = svg.node().getBoundingClientRect().height - 10;
palettes = svg.selectAll('.palette').data(scales).enter().append('g').attr({
"class": 'palette',
transform: function(d, i) {
return "translate(10," + (10 + i * height / n) + ")";
}
});
palettes.selectAll('.band').data(d3.range(256)).enter().append('rect').attr({
"class": 'band',
x: function(d, i) {
return i * width / 256;
},
width: width / 256,
height: height / n - 10,
fill: function(d) {
return d3.select(this.parentNode).datum()(d);
}
});
}).call(this);
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