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hsluv.ts
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hsluv.ts
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export class Hsluv {
private static hexChars: string = "0123456789abcdef";
private static refY: number = 1.0;
private static refU: number = 0.19783000664283;
private static refV: number = 0.46831999493879;
private static kappa: number = 903.2962962;
private static epsilon: number = 0.0088564516;
private static m_r0: number = 3.240969941904521;
private static m_r1: number = -1.537383177570093;
private static m_r2: number = -0.498610760293;
private static m_g0: number = -0.96924363628087;
private static m_g1: number = 1.87596750150772;
private static m_g2: number = 0.041555057407175;
private static m_b0: number = 0.055630079696993;
private static m_b1: number = -0.20397695888897;
private static m_b2: number = 1.056971514242878;
// RGB
public hex: string = '#000000';
public rgb_r: number = 0;
public rgb_g: number = 0;
public rgb_b: number = 0;
// CIE XYZ
public xyz_x: number = 0;
public xyz_y: number = 0;
public xyz_z: number = 0;
// CIE LUV
public luv_l: number = 0;
public luv_u: number = 0;
public luv_v: number = 0;
// CIE LUV LCh
public lch_l: number = 0;
public lch_c: number = 0;
public lch_h: number = 0;
// HSLuv
public hsluv_h: number = 0;
public hsluv_s: number = 0;
public hsluv_l: number = 0;
// HPLuv
public hpluv_h: number = 0;
public hpluv_p: number = 0;
public hpluv_l: number = 0;
// 6 lines in slope-intercept format: R < 0, R > 1, G < 0, G > 1, B < 0, B > 1
public r0s: number = 0;
public r0i: number = 0;
public r1s: number = 0;
public r1i: number = 0;
public g0s: number = 0;
public g0i: number = 0;
public g1s: number = 0;
public g1i: number = 0;
public b0s: number = 0;
public b0i: number = 0;
public b1s: number = 0;
public b1i: number = 0;
private static fromLinear(c: number): number {
if (c <= 0.0031308) {
return 12.92 * c;
} else {
return 1.055 * Math.pow(c, 1 / 2.4) - 0.055;
}
}
private static toLinear(c: number): number {
if (c > 0.04045) {
return Math.pow((c + 0.055) / 1.055, 2.4);
} else {
return c / 12.92;
}
}
private static yToL(Y: number): number {
if (Y <= Hsluv.epsilon) {
return Y / Hsluv.refY * Hsluv.kappa;
} else {
return 116 * Math.pow(Y / Hsluv.refY, 1 / 3) - 16;
}
}
private static lToY(L: number): number {
if (L <= 8) {
return Hsluv.refY * L / Hsluv.kappa;
} else {
return Hsluv.refY * Math.pow((L + 16) / 116, 3);
}
}
private static rgbChannelToHex(chan: number): string {
const c = Math.round(chan * 255);
const digit2 = c % 16;
const digit1 = (c - digit2) / 16 | 0;
return Hsluv.hexChars.charAt(digit1) + Hsluv.hexChars.charAt(digit2);
}
private static hexToRgbChannel(hex: string, offset: number): number {
const digit1 = Hsluv.hexChars.indexOf(hex.charAt(offset));
const digit2 = Hsluv.hexChars.indexOf(hex.charAt(offset + 1));
const n = digit1 * 16 + digit2;
return n / 255.0;
}
private static distanceFromOriginAngle(slope: number, intercept: number, angle: number): number {
const d = intercept / (Math.sin(angle) - slope * Math.cos(angle));
if (d < 0) {
return Infinity;
} else {
return d;
}
}
private static distanceFromOrigin(slope: number, intercept: number): number {
return Math.abs(intercept) / Math.sqrt(Math.pow(slope, 2) + 1);
}
private static min6(f1: number, f2: number, f3: number, f4: number, f5: number, f6: number): number {
return Math.min(f1, Math.min(f2, Math.min(f3, Math.min(f4, Math.min(f5, f6)))));
}
public rgbToHex(): void {
this.hex = "#";
this.hex += Hsluv.rgbChannelToHex(this.rgb_r);
this.hex += Hsluv.rgbChannelToHex(this.rgb_g);
this.hex += Hsluv.rgbChannelToHex(this.rgb_b);
}
public hexToRgb(): void {
this.hex = this.hex.toLowerCase();
this.rgb_r = Hsluv.hexToRgbChannel(this.hex, 1);
this.rgb_g = Hsluv.hexToRgbChannel(this.hex, 3);
this.rgb_b = Hsluv.hexToRgbChannel(this.hex, 5);
}
public xyzToRgb(): void {
this.rgb_r = Hsluv.fromLinear(Hsluv.m_r0 * this.xyz_x + Hsluv.m_r1 * this.xyz_y + Hsluv.m_r2 * this.xyz_z);
this.rgb_g = Hsluv.fromLinear(Hsluv.m_g0 * this.xyz_x + Hsluv.m_g1 * this.xyz_y + Hsluv.m_g2 * this.xyz_z);
this.rgb_b = Hsluv.fromLinear(Hsluv.m_b0 * this.xyz_x + Hsluv.m_b1 * this.xyz_y + Hsluv.m_b2 * this.xyz_z);
}
public rgbToXyz(): void {
const lr = Hsluv.toLinear(this.rgb_r);
const lg = Hsluv.toLinear(this.rgb_g);
const lb = Hsluv.toLinear(this.rgb_b);
this.xyz_x = 0.41239079926595 * lr + 0.35758433938387 * lg + 0.18048078840183 * lb;
this.xyz_y = 0.21263900587151 * lr + 0.71516867876775 * lg + 0.072192315360733 * lb;
this.xyz_z = 0.019330818715591 * lr + 0.11919477979462 * lg + 0.95053215224966 * lb;
}
public xyzToLuv(): void {
const divider = this.xyz_x + 15 * this.xyz_y + 3 * this.xyz_z;
let varU = 4 * this.xyz_x;
let varV = 9 * this.xyz_y;
if (divider !== 0) {
varU /= divider;
varV /= divider;
} else {
varU = NaN;
varV = NaN;
}
this.luv_l = Hsluv.yToL(this.xyz_y);
if (this.luv_l === 0) {
this.luv_u = 0;
this.luv_v = 0;
} else {
this.luv_u = 13 * this.luv_l * (varU - Hsluv.refU);
this.luv_v = 13 * this.luv_l * (varV - Hsluv.refV);
}
}
public luvToXyz(): void {
if (this.luv_l === 0) {
this.xyz_x = 0;
this.xyz_y = 0;
this.xyz_z = 0;
return;
}
const varU = this.luv_u / (13 * this.luv_l) + Hsluv.refU;
const varV = this.luv_v / (13 * this.luv_l) + Hsluv.refV;
this.xyz_y = Hsluv.lToY(this.luv_l);
this.xyz_x = 0 - 9 * this.xyz_y * varU / ((varU - 4) * varV - varU * varV);
this.xyz_z = (9 * this.xyz_y - 15 * varV * this.xyz_y - varV * this.xyz_x) / (3 * varV);
}
public luvToLch(): void {
this.lch_l = this.luv_l;
this.lch_c = Math.sqrt(this.luv_u * this.luv_u + this.luv_v * this.luv_v);
if (this.lch_c < 0.00000001) {
this.lch_h = 0;
} else {
const hrad = Math.atan2(this.luv_v, this.luv_u);
this.lch_h = hrad * 180.0 / Math.PI;
if (this.lch_h < 0) {
this.lch_h = 360 + this.lch_h;
}
}
}
public lchToLuv(): void {
const hrad = this.lch_h / 180.0 * Math.PI;
this.luv_l = this.lch_l;
this.luv_u = Math.cos(hrad) * this.lch_c;
this.luv_v = Math.sin(hrad) * this.lch_c;
}
public calculateBoundingLines(l: number): void {
const sub1 = Math.pow(l + 16, 3) / 1560896;
const sub2 = sub1 > Hsluv.epsilon ? sub1 : l / Hsluv.kappa;
const s1r = sub2 * (284517 * Hsluv.m_r0 - 94839 * Hsluv.m_r2);
const s2r = sub2 * (838422 * Hsluv.m_r2 + 769860 * Hsluv.m_r1 + 731718 * Hsluv.m_r0);
const s3r = sub2 * (632260 * Hsluv.m_r2 - 126452 * Hsluv.m_r1);
const s1g = sub2 * (284517 * Hsluv.m_g0 - 94839 * Hsluv.m_g2);
const s2g = sub2 * (838422 * Hsluv.m_g2 + 769860 * Hsluv.m_g1 + 731718 * Hsluv.m_g0);
const s3g = sub2 * (632260 * Hsluv.m_g2 - 126452 * Hsluv.m_g1);
const s1b = sub2 * (284517 * Hsluv.m_b0 - 94839 * Hsluv.m_b2);
const s2b = sub2 * (838422 * Hsluv.m_b2 + 769860 * Hsluv.m_b1 + 731718 * Hsluv.m_b0);
const s3b = sub2 * (632260 * Hsluv.m_b2 - 126452 * Hsluv.m_b1);
this.r0s = s1r / s3r;
this.r0i = s2r * l / s3r;
this.r1s = s1r / (s3r + 126452);
this.r1i = (s2r - 769860) * l / (s3r + 126452);
this.g0s = s1g / s3g;
this.g0i = s2g * l / s3g;
this.g1s = s1g / (s3g + 126452);
this.g1i = (s2g - 769860) * l / (s3g + 126452);
this.b0s = s1b / s3b;
this.b0i = s2b * l / s3b;
this.b1s = s1b / (s3b + 126452);
this.b1i = (s2b - 769860) * l / (s3b + 126452);
}
public calcMaxChromaHpluv(): number {
const r0 = Hsluv.distanceFromOrigin(this.r0s, this.r0i);
const r1 = Hsluv.distanceFromOrigin(this.r1s, this.r1i);
const g0 = Hsluv.distanceFromOrigin(this.g0s, this.g0i);
const g1 = Hsluv.distanceFromOrigin(this.g1s, this.g1i);
const b0 = Hsluv.distanceFromOrigin(this.b0s, this.b0i);
const b1 = Hsluv.distanceFromOrigin(this.b1s, this.b1i);
return Hsluv.min6(r0, r1, g0, g1, b0, b1);
}
public calcMaxChromaHsluv(h: number): number {
const hueRad = h / 360 * Math.PI * 2;
const r0 = Hsluv.distanceFromOriginAngle(this.r0s, this.r0i, hueRad);
const r1 = Hsluv.distanceFromOriginAngle(this.r1s, this.r1i, hueRad);
const g0 = Hsluv.distanceFromOriginAngle(this.g0s, this.g0i, hueRad);
const g1 = Hsluv.distanceFromOriginAngle(this.g1s, this.g1i, hueRad);
const b0 = Hsluv.distanceFromOriginAngle(this.b0s, this.b0i, hueRad);
const b1 = Hsluv.distanceFromOriginAngle(this.b1s, this.b1i, hueRad);
return Hsluv.min6(r0, r1, g0, g1, b0, b1);
}
public hsluvToLch(): void {
if (this.hsluv_l > 99.9999999) {
this.lch_l = 100;
this.lch_c = 0;
} else if (this.hsluv_l < 0.00000001) {
this.lch_l = 0;
this.lch_c = 0;
} else {
this.lch_l = this.hsluv_l;
this.calculateBoundingLines(this.hsluv_l);
const max = this.calcMaxChromaHsluv(this.hsluv_h);
this.lch_c = max / 100 * this.hsluv_s;
}
this.lch_h = this.hsluv_h;
}
public lchToHsluv(): void {
if (this.lch_l > 99.9999999) {
this.hsluv_s = 0;
this.hsluv_l = 100;
} else if (this.lch_l < 0.00000001) {
this.hsluv_s = 0;
this.hsluv_l = 0;
} else {
this.calculateBoundingLines(this.lch_l);
const max = this.calcMaxChromaHsluv(this.lch_h);
this.hsluv_s = this.lch_c / max * 100;
this.hsluv_l = this.lch_l;
}
this.hsluv_h = this.lch_h;
}
public hpluvToLch(): void {
if (this.hpluv_l > 99.9999999) {
this.lch_l = 100;
this.lch_c = 0;
} else if (this.hpluv_l < 0.00000001) {
this.lch_l = 0;
this.lch_c = 0;
} else {
this.lch_l = this.hpluv_l;
this.calculateBoundingLines(this.hpluv_l);
const max = this.calcMaxChromaHpluv();
this.lch_c = max / 100 * this.hpluv_p;
}
this.lch_h = this.hpluv_h;
}
public lchToHpluv(): void {
if (this.lch_l > 99.9999999) {
this.hpluv_p = 0;
this.hpluv_l = 100;
} else if (this.lch_l < 0.00000001) {
this.hpluv_p = 0;
this.hpluv_l = 0;
} else {
this.calculateBoundingLines(this.lch_l);
const max = this.calcMaxChromaHpluv();
this.hpluv_p = this.lch_c / max * 100;
this.hpluv_l = this.lch_l;
}
this.hpluv_h = this.lch_h;
}
public hsluvToRgb(): void {
this.hsluvToLch();
this.lchToLuv();
this.luvToXyz();
this.xyzToRgb();
}
public hpluvToRgb(): void {
this.hpluvToLch();
this.lchToLuv();
this.luvToXyz();
this.xyzToRgb();
}
public hsluvToHex(): void {
this.hsluvToRgb();
this.rgbToHex();
}
public hpluvToHex(): void {
this.hpluvToRgb();
this.rgbToHex();
}
public rgbToHsluv(): void {
this.rgbToXyz();
this.xyzToLuv();
this.luvToLch();
this.lchToHpluv();
this.lchToHsluv();
}
public rgbToHpluv(): void {
this.rgbToXyz();
this.xyzToLuv();
this.luvToLch();
this.lchToHpluv();
this.lchToHpluv();
}
public hexToHsluv(): void {
this.hexToRgb();
this.rgbToHsluv();
}
public hexToHpluv(): void {
this.hexToRgb();
this.rgbToHpluv();
}
}