Cubehelix Color Space

A two-dimensional cross section of the Cubehelix color space: from top to bottom, hue ranges from 0° to 360°; from left to right, lightness ranges from 1 to 0. Saturation is a constant 1.

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/* https://github.com/d3/d3-color Copyright 2015 Mike Bostock. */
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s=isNaN(t.h)?e.h:t.h,n=isNaN(t.s)?e.s:t.s,r=t.l,i=isNaN(e.h)?0:e.h-s,a=isNaN(e.s)?0:e.s-n,o=e.l-r;return function(e){return t.h=s+i*e,t.s=n+a*e,t.l=r+o*e,t+""}},tt=function(t,e){t=y(t),e=y(e);var s=isNaN(t.h)?e.h:t.h,n=isNaN(t.s)?e.s:t.s,r=t.l,i=isNaN(e.h)?0:U(e.h,s),a=isNaN(e.s)?0:e.s-n,o=e.l-r;return function(e){return t.h=s+i*e,t.s=n+a*e,t.l=r+o*e,t+""}},et=function(t,e){t=N(t),e=N(e);var s=t.r,r=t.g,i=t.b,a=e.r-s,o=e.g-r,h=e.b-i;return function(t){return n(Math.round(s+a*t),Math.round(r+o*t),Math.round(i+h*t))}};t.color=v,t.rgb=N,t.hsl=y,t.lab=C,t.hcl=P,t.cubehelix=Q,t.interpolateRgb=et,t.interpolateHsl=tt,t.interpolateHslLong=Z,t.interpolateLab=Y,t.interpolateHcl=X,t.interpolateHclLong=W,t.interpolateCubehelix=V,t.interpolateCubehelixLong=T});

var canvas = document.querySelector("canvas"),
    width = canvas.width,
    height = canvas.height,
    context = canvas.getContext("2d"),
    image = context.createImageData(width, height),
    hue,
    y = -1,
    i = -1;

while (++y < height) {
  for (var x = 0, c; x < width; ++x) {
    c = color.cubehelix(360 * y / (height - 1), 1, 1 - x / (width - 1)).rgb();
    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>