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hsp.js
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hsp.js
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/**
* @module color-space/hsp
*/
import rgb from './rgb.js'
const Pr = 0.299,
Pg = 0.587,
Pb = 0.114;
export default {
name: 'hsp',
min: [0, 0, 0],
max: [360, 100, 255],
channel: ['hue', 'saturation', 'perceived_brightness'],
alias: ['HSP'],
rgb: function (hsp) {
var h = hsp[0]/360.0,
s = hsp[1]/100.0,
p = hsp[2],
r, g, b, part,
minOverMax = 1.0 - s;
if (minOverMax > 0.0) {
if (h < 1.0 / 6.0) { // R>G>B
h = 6.0 * (h - 0.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
b = p / Math.sqrt(Pr / minOverMax / minOverMax + Pg * part * part + Pb);
r = (b) / minOverMax;
g = (b) + h * ((r) - (b));
} else if (h < 2.0 / 6.0) { // G>R>B
h = 6.0 * (-h + 2.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
b = p / Math.sqrt(Pg / minOverMax / minOverMax + Pr * part * part + Pb);
g = (b) / minOverMax;
r = (b) + h * ((g) - (b));
} else if (h < 3.0 / 6.0) { // G>B>R
h = 6.0 * (h - 2.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
r = p / Math.sqrt(Pg / minOverMax / minOverMax + Pb * part * part + Pr);
g = (r) / minOverMax;
b = (r) + h * ((g) - (r));
} else if (h < 4.0 / 6.0) { // B>G>R
h = 6.0 * (-h + 4.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
r = p / Math.sqrt(Pb / minOverMax / minOverMax + Pg * part * part + Pr);
b = (r) / minOverMax;
g = (r) + h * ((b) - (r));
} else if (h < 5.0 / 6.0) { // B>R>G
h = 6.0 * (h - 4.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
g = p / Math.sqrt(Pb / minOverMax / minOverMax + Pr * part * part + Pg);
b = (g) / minOverMax;
r = (g) + h * ((b) - (g));
} else { // R>B>G
h = 6.0 * (-h + 6.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
g = p / Math.sqrt(Pr / minOverMax / minOverMax + Pb * part * part + Pg);
r = (g) / minOverMax;
b = (g) + h * ((r) - (g));
}
} else {
if (h < 1.0 / 6.0) { // R>G>B
h = 6.0 * (h - 0.0 / 6.0);
r = Math.sqrt(p * p / (Pr + Pg * h * h));
g = (r) * h;
b = 0.0;
} else if (h < 2.0 / 6.0) { // G>R>B
h = 6.0 * (-h + 2.0 / 6.0);
g = Math.sqrt(p * p / (Pg + Pr * h * h));
r = (g) * h;
b = 0.0;
} else if (h < 3.0 / 6.0) { // G>B>R
h = 6.0 * (h - 2.0 / 6.0);
g = Math.sqrt(p * p / (Pg + Pb * h * h));
b = (g) * h;
r = 0.0;
} else if (h < 4.0 / 6.0) { // B>G>R
h = 6.0 * (-h + 4.0 / 6.0);
b = Math.sqrt(p * p / (Pb + Pg * h * h));
g = (b) * h;
r = 0.0;
} else if (h < 5.0 / 6.0) { // B>R>G
h = 6.0 * (h - 4.0 / 6.0);
b = Math.sqrt(p * p / (Pb + Pr * h * h));
r = (b) * h;
g = 0.0;
} else { // R>B>G
h = 6.0 * (-h + 6.0 / 6.0);
r = Math.sqrt(p * p / (Pr + Pb * h * h));
b = (r) * h;
g = 0.0;
}
}
return [Math.round(r), Math.round(g), Math.round(b)];
}
};
//append rgb
rgb.hsp = function (rgb) {
var r = parseInt(rgb[0], 10),
g = parseInt(rgb[1], 10),
b = parseInt(rgb[2], 10),
h, s, p;
// Calculate the Perceived brightness
p = Math.sqrt(r * r * Pr + g * g * Pg + b * b * Pb);
// Calculate the Hue and Saturation
if (r === g && r === b) {
h = 0.0;
s = 0.0;
} else {
// R is largest
if (r >= g && r >= b) {
if (b >= g) {
h = 6.0 / 6.0 - 1.0 / 6.0 * (b - g) / (r - g);
s = 1.0 - g / r;
} else {
h = 0.0 / 6.0 + 1.0 / 6.0 * (g - b) / (r - b);
s = 1.0 - b / r;
}
}
// G is largest
if (g >= r && g >= b) {
if (r >= b) {
h = 2.0 / 6.0 - 1.0 / 6.0 * (r - b) / (g - b);
s = 1 - b / g;
} else {
h = 2.0 / 6.0 + 1.0 / 6.0 * (b - r) / (g - r);
s = 1.0 - r / g;
}
}
// B is largest
if (b >= r && b >= g) {
if (g >= r) {
h = 4.0 / 6.0 - 1.0 / 6.0 * (g - r) / (b - r);
s = 1.0 - r / b;
} else {
h = 4.0 / 6.0 + 1.0 / 6.0 * (r - g) / (b - g);
s = 1.0 - g / b;
}
}
}
return [Math.round(h*360.0), s*100.0, Math.round(p)];
};