/ accepts parameters * h Object = {h:x, s:y, v:z} * OR * h, s, v/ function HSVtoRGB(h, s, v) { var r, g, b, i, f, p, q, t; if (arguments.length === 1) { s = h.s, v = h.v, h = h.h; } i = Math.floor(h * 6); f = h * 6 - i; p = v * (1 - s); q = v * (1 - f * s); t = v * (1 - (1 - f) * s); switch (i % 6) { case 0: r = v, g = t, b = p; break; case 1: r = q, g = v, b = p; break; case 2: r = p, g = v, b = t; break; case 3: r = p, g = q, b = v; break; case 4: r = t, g = p, b = v; break; case 5: r = v, g = p, b = q; break; } return { r: Math.round(r * 255), g: Math.round(g * 255), b: Math.round(b * 255) }; }
0 <= h, s, v <= 1如果您使用度数或弧度，则此代码应为，请记住将其分开。
返回0 <= r, g, b <= 255的值四舍五入到最接近的 Integer 。如果您不希望出现这种情况，请Math.round从返回的对象中删除。
反之（除法较少）
/* accepts parameters
* r Object = {r:x, g:y, b:z}
* OR
* r, g, b
*/
function RGBtoHSV(r, g, b) {
if (arguments.length === 1) {
g = r.g, b = r.b, r = r.r;
}
var max = Math.max(r, g, b), min = Math.min(r, g, b),
d = max - min,
h,
s = (max === 0 ? 0 : d / max),
v = max / 255;
switch (max) {
case min: h = 0; break;
case r: h = (g - b) + d * (g < b ? 6: 0); h /= 6 * d; break;
case g: h = (b - r) + d * 2; h /= 6 * d; break;
case b: h = (r - g) + d * 4; h /= 6 * d; break;
}
return {
h: h,
s: s,
v: v
};
}
该代码将输出0 <= h, s, v <= 1，但是这次需要任何时间0 <= r, g, b <= 255（不需要是整数）
为了完整性，
function HSVtoHSL(h, s, v) {
if (arguments.length === 1) {
s = h.s, v = h.v, h = h.h;
}
var _h = h,
_s = s * v,
_l = (2 - s) * v;
_s /= (_l <= 1) ? _l : 2 - _l;
_l /= 2;
return {
h: _h,
s: _s,
l: _l
};
}
function HSLtoHSV(h, s, l) {
if (arguments.length === 1) {
s = h.s, l = h.l, h = h.h;
}
var _h = h,
_s,
_v;
l *= 2;
s *= (l <= 1) ? l : 2 - l;
_v = (l + s) / 2;
_s = (2 * s) / (l + s);
return {
h: _h,
s: _s,
v: _v
};
}
所有这些值应在范围0来1。对于 HSL<->RGB_通过去 _HSV 。
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