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64 lines (51 loc) · 1.42 KB
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import "color";
import "rgb";
d3.hsl = function(h, s, l) {
return arguments.length === 1
? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l)
: d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl))
: d3_hsl(+h, +s, +l);
};
function d3_hsl(h, s, l) {
return new d3_Hsl(h, s, l);
}
function d3_Hsl(h, s, l) {
this.h = h;
this.s = s;
this.l = l;
}
var d3_hslPrototype = d3_Hsl.prototype = new d3_Color;
d3_hslPrototype.brighter = function(k) {
k = Math.pow(0.7, arguments.length ? k : 1);
return d3_hsl(this.h, this.s, this.l / k);
};
d3_hslPrototype.darker = function(k) {
k = Math.pow(0.7, arguments.length ? k : 1);
return d3_hsl(this.h, this.s, k * this.l);
};
d3_hslPrototype.rgb = function() {
return d3_hsl_rgb(this.h, this.s, this.l);
};
function d3_hsl_rgb(h, s, l) {
var m1,
m2;
/* Some simple corrections for h, s and l. */
h = isNaN(h) ? 0 : (h %= 360) < 0 ? h + 360 : h;
s = isNaN(s) ? 0 : s < 0 ? 0 : s > 1 ? 1 : s;
l = l < 0 ? 0 : l > 1 ? 1 : l;
/* From FvD 13.37, CSS Color Module Level 3 */
m2 = l <= .5 ? l * (1 + s) : l + s - l * s;
m1 = 2 * l - m2;
function v(h) {
if (h > 360) h -= 360;
else if (h < 0) h += 360;
if (h < 60) return m1 + (m2 - m1) * h / 60;
if (h < 180) return m2;
if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;
return m1;
}
function vv(h) {
return Math.round(v(h) * 255);
}
return d3_rgb(vv(h + 120), vv(h), vv(h - 120));
}