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HCL linear rainbow scales (for d3)
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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) | |
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html, body { | |
padding: 0; | |
margin: 0; | |
} | |
svg { | |
background: white; | |
} | |
.band { | |
shape-rendering: crispEdges; | |
} |
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<!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> |
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(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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