forked from aaizemberg's block: Color Interpolate (RGB, HSL & CubeHelix)
Created
November 11, 2018 09:26
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Color Interpolate (RGB, HSL & CubeHelix)
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license: mit |
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<!DOCTYPE html> | |
<html> | |
<head> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
<title>Color Interpolate (RGB, HSL, CubeHelix)</title> | |
</head> | |
<body> | |
<div id="rgb"></div> | |
<div id="hsl"></div> | |
<div id="cubehelix"></div> | |
<script> | |
// https://github.com/d3/d3-plugins/blob/master/cubehelix/cubehelix.js | |
(function() { | |
var radians = Math.PI / 180; | |
d3.scale.cubehelix = function() { | |
return d3.scale.linear() | |
.range([d3.hsl(300, 0.5, 0), d3.hsl(-240, 0.5, 1)]) | |
.interpolate(d3.interpolateCubehelix); | |
}; | |
d3.interpolateCubehelix = d3_interpolateCubehelix(1); | |
d3.interpolateCubehelix.gamma = d3_interpolateCubehelix; | |
function d3_interpolateCubehelix(γ) { | |
return function(a, b) { | |
a = d3.hsl(a); | |
b = d3.hsl(b); | |
var ah = (a.h + 120) * radians, | |
bh = (b.h + 120) * radians - ah, | |
as = a.s, | |
bs = b.s - as, | |
al = a.l, | |
bl = b.l - al; | |
// if (isNaN(bs)) bs = 0, as = isNaN(as) ? b.s : as; | |
// if (isNaN(bh)) bh = 0, ah = isNaN(ah) ? b.h : ah; | |
return function(t) { | |
var h = ah + bh * t, | |
l = Math.pow(al + bl * t, γ), | |
a = (as + bs * t) * l * (1 - l), | |
cosh = Math.cos(h), | |
sinh = Math.sin(h); | |
return "#" + | |
hex(l + a * (-0.14861 * cosh + 1.78277 * sinh)) + | |
hex(l + a * (-0.29227 * cosh - 0.90649 * sinh)) + | |
hex(l + a * (+1.97294 * cosh)); | |
}; | |
}; | |
} | |
function hex(v) { | |
var s = (v = v <= 0 ? 0 : v >= 1 ? 255 : v * 255 | 0).toString(16); | |
return v < 0x10 ? "0" + s : s; | |
} | |
})(); | |
var a = "blue"; | |
var b = "red"; | |
var c1 = d3.interpolateRgb(a, b); | |
var c2 = d3.interpolateHsl(a, b); | |
console.log(c1) | |
// var c3 = d3.interpolateCubehelix("hsl(300,50%,0%)", "hsl(-240,50%,100%)"); | |
// d3.hsl(300, .5, 0) ,d3.hsl(-240, .5, 1) | |
var c3 = d3.scale.cubehelix(); | |
var width = 200, height = 200, radius = Math.min(width, height) / 2; | |
var arc = d3.svg.arc() | |
.outerRadius(radius - 10) | |
.innerRadius(50); | |
var data = [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]; | |
var pie = d3.layout.pie() | |
.sort(null) | |
.value(function(d) { return d; }); | |
function draw(id, color) { | |
var svg = d3.select(id).append("svg") | |
.attr("width", width) | |
.attr("height", height) | |
.append("g") | |
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
var g = svg.selectAll(".arc") | |
.data(pie(data)) | |
.enter().append("g") | |
.attr("class", "arc"); | |
g.append("path") | |
.attr("d", arc) | |
//.attr("stroke", "#fff") | |
.style("fill", function(d,i) {return color(i / data.length);}); | |
} | |
draw("div#rgb", c1); | |
draw("div#hsl", c2); | |
draw("div#cubehelix", c3); | |
</script> | |
</body> | |
</html> |
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