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Pending changes exported from your codespace
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@boronine
boronine committed Jun 26, 2024
1 parent a8c1e19 commit 225aacc
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374 changes: 374 additions & 0 deletions src/main/java/org/hsluv/HsluvColorConverter.java
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package org.hsluv;

public class HsluvColorConverter {
private static double refY = 1.0;
private static double refU = 0.19783000664283;
private static double refV = 0.46831999493879;
private static double kappa = 903.2962962;
private static double epsilon = 0.0088564516;
private static double m_r0 = 3.240969941904521;
private static double m_r1 = -1.537383177570093;
private static double m_r2 = -0.498610760293;
private static double m_g0 = -0.96924363628087;
private static double m_g1 = 1.87596750150772;
private static double m_g2 = 0.041555057407175;
private static double m_b0 = 0.055630079696993;
private static double m_b1 = -0.20397695888897;
private static double m_b2 = 1.056971514242878;

// RGB
public String hex = "#000000";
public double rgb_r = 0;
public double rgb_g = 0;
public double rgb_b = 0;

// CIE XYZ
public double xyz_x = 0;
public double xyz_y = 0;
public double xyz_z = 0;

// CIE LUV
public double luv_l = 0;
public double luv_u = 0;
public double luv_v = 0;

// CIE LUV LCh
public double lch_l = 0;
public double lch_c = 0;
public double lch_h = 0;

// HSLuv
public double hsluv_h = 0;
public double hsluv_s = 0;
public double hsluv_l = 0;

// HPLuv
public double hpluv_h = 0;
public double hpluv_p = 0;
public double hpluv_l = 0;

// 6 lines in slope-intercept format: R < 0, R > 1, G < 0, G > 1, B < 0, B > 1
public double r0s = 0;
public double r0i = 0;
public double r1s = 0;
public double r1i = 0;

public double g0s = 0;
public double g0i = 0;
public double g1s = 0;
public double g1i = 0;

public double b0s = 0;
public double b0i = 0;
public double b1s = 0;
public double b1i = 0;

private static double fromLinear(double c) {
if (c <= 0.0031308) {
return 12.92 * c;
} else {
return 1.055 * Math.pow(c, 1 / 2.4) - 0.055;
}
}

private static double toLinear(double c) {
if (c > 0.04045) {
return Math.pow((c + 0.055) / 1.055, 2.4);
} else {
return c / 12.92;
}
}

private static double yToL(double Y) {
if (Y <= HsluvColorConverter.epsilon) {
return Y / HsluvColorConverter.refY * HsluvColorConverter.kappa;
} else {
return 116 * Math.pow(Y / HsluvColorConverter.refY, 1 / 3) - 16;
}
}

private static double lToY(double L) {
if (L <= 8) {
return HsluvColorConverter.refY * L / HsluvColorConverter.kappa;
} else {
return HsluvColorConverter.refY * Math.pow((L + 16) / 116, 3);
}
}

private static String rgbChannelToHex(double chan) {
return String.format("%02x", chan);
}

private static double hexToRgbChannel(String hex, int offset) {
return (double) Integer.parseInt(hex.substring(offset, offset + 2));
}

private static double distanceFromOriginAngle(double slope, double intercept, double angle) {
double d = intercept / (Math.sin(angle) - slope * Math.cos(angle));
if (d < 0) {
return Double.POSITIVE_INFINITY;
} else {
return d;
}
}

private static double distanceFromOrigin(double slope, double intercept) {
return Math.abs(intercept) / Math.sqrt(Math.pow(slope, 2) + 1);
}

private static double min6(double f1, double f2, double f3, double f4, double f5, double f6) {
return Math.min(f1, Math.min(f2, Math.min(f3, Math.min(f4, Math.min(f5, f6)))));
}

public void rgbToHex() {
this.hex = "#";
this.hex += HsluvColorConverter.rgbChannelToHex(this.rgb_r);
this.hex += HsluvColorConverter.rgbChannelToHex(this.rgb_g);
this.hex += HsluvColorConverter.rgbChannelToHex(this.rgb_b);
}

public void hexToRgb() {
this.hex = this.hex.toLowerCase();
this.rgb_r = HsluvColorConverter.hexToRgbChannel(this.hex, 1);
this.rgb_g = HsluvColorConverter.hexToRgbChannel(this.hex, 3);
this.rgb_b = HsluvColorConverter.hexToRgbChannel(this.hex, 5);
}

public void xyzToRgb() {
this.rgb_r = HsluvColorConverter.fromLinear(HsluvColorConverter.m_r0 * this.xyz_x
+ HsluvColorConverter.m_r1 * this.xyz_y + HsluvColorConverter.m_r2 * this.xyz_z);
this.rgb_g = HsluvColorConverter.fromLinear(HsluvColorConverter.m_g0 * this.xyz_x
+ HsluvColorConverter.m_g1 * this.xyz_y + HsluvColorConverter.m_g2 * this.xyz_z);
this.rgb_b = HsluvColorConverter.fromLinear(HsluvColorConverter.m_b0 * this.xyz_x
+ HsluvColorConverter.m_b1 * this.xyz_y + HsluvColorConverter.m_b2 * this.xyz_z);
}

public void rgbToXyz() {
double lr = HsluvColorConverter.toLinear(this.rgb_r);
double lg = HsluvColorConverter.toLinear(this.rgb_g);
double lb = HsluvColorConverter.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 void xyzToLuv() {
double divider = this.xyz_x + 15 * this.xyz_y + 3 * this.xyz_z;
double varU = 4 * this.xyz_x;
double varV = 9 * this.xyz_y;
if (divider != 0) {
varU /= divider;
varV /= divider;
} else {
varU = Double.NaN;
varV = Double.NaN;
}
this.luv_l = HsluvColorConverter.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 - HsluvColorConverter.refU);
this.luv_v = 13 * this.luv_l * (varV - HsluvColorConverter.refV);
}
}

public void luvToXyz() {
if (this.luv_l == 0) {
this.xyz_x = 0;
this.xyz_y = 0;
this.xyz_z = 0;
return;
}
double varU = this.luv_u / (13 * this.luv_l) + HsluvColorConverter.refU;
double varV = this.luv_v / (13 * this.luv_l) + HsluvColorConverter.refV;
this.xyz_y = HsluvColorConverter.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 void luvToLch() {
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 {
double 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 void lchToLuv() {
double 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 void calculateBoundingLines(double l) {
double sub1 = Math.pow(l + 16, 3) / 1560896;
double sub2 = sub1 > HsluvColorConverter.epsilon ? sub1 : l / HsluvColorConverter.kappa;
double s1r = sub2 * (284517 * HsluvColorConverter.m_r0 - 94839 * HsluvColorConverter.m_r2);
double s2r = sub2 * (838422 * HsluvColorConverter.m_r2 + 769860 * HsluvColorConverter.m_r1
+ 731718 * HsluvColorConverter.m_r0);
double s3r = sub2 * (632260 * HsluvColorConverter.m_r2 - 126452 * HsluvColorConverter.m_r1);
double s1g = sub2 * (284517 * HsluvColorConverter.m_g0 - 94839 * HsluvColorConverter.m_g2);
double s2g = sub2 * (838422 * HsluvColorConverter.m_g2 + 769860 * HsluvColorConverter.m_g1
+ 731718 * HsluvColorConverter.m_g0);
double s3g = sub2 * (632260 * HsluvColorConverter.m_g2 - 126452 * HsluvColorConverter.m_g1);
double s1b = sub2 * (284517 * HsluvColorConverter.m_b0 - 94839 * HsluvColorConverter.m_b2);
double s2b = sub2 * (838422 * HsluvColorConverter.m_b2 + 769860 * HsluvColorConverter.m_b1
+ 731718 * HsluvColorConverter.m_b0);
double s3b = sub2 * (632260 * HsluvColorConverter.m_b2 - 126452 * HsluvColorConverter.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 double calcMaxChromaHpluv() {
double r0 = HsluvColorConverter.distanceFromOrigin(this.r0s, this.r0i);
double r1 = HsluvColorConverter.distanceFromOrigin(this.r1s, this.r1i);
double g0 = HsluvColorConverter.distanceFromOrigin(this.g0s, this.g0i);
double g1 = HsluvColorConverter.distanceFromOrigin(this.g1s, this.g1i);
double b0 = HsluvColorConverter.distanceFromOrigin(this.b0s, this.b0i);
double b1 = HsluvColorConverter.distanceFromOrigin(this.b1s, this.b1i);
return HsluvColorConverter.min6(r0, r1, g0, g1, b0, b1);
}

public double calcMaxChromaHsluv(double h) {
double hueRad = h / 360 * Math.PI * 2;
double r0 = HsluvColorConverter.distanceFromOriginAngle(this.r0s, this.r0i, hueRad);
double r1 = HsluvColorConverter.distanceFromOriginAngle(this.r1s, this.r1i, hueRad);
double g0 = HsluvColorConverter.distanceFromOriginAngle(this.g0s, this.g0i, hueRad);
double g1 = HsluvColorConverter.distanceFromOriginAngle(this.g1s, this.g1i, hueRad);
double b0 = HsluvColorConverter.distanceFromOriginAngle(this.b0s, this.b0i, hueRad);
double b1 = HsluvColorConverter.distanceFromOriginAngle(this.b1s, this.b1i, hueRad);
return HsluvColorConverter.min6(r0, r1, g0, g1, b0, b1);
}

public void hsluvToLch() {
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);
double max = this.calcMaxChromaHsluv(this.hsluv_h);
this.lch_c = max / 100 * this.hsluv_s;
}
this.lch_h = this.hsluv_h;
}

public void lchToHsluv() {
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);
double 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 void hpluvToLch() {
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);
double max = this.calcMaxChromaHpluv();
this.lch_c = max / 100 * this.hpluv_p;
}
this.lch_h = this.hpluv_h;
}

public void lchToHpluv() {
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);
double max = this.calcMaxChromaHpluv();
this.hpluv_p = this.lch_c / max * 100;
this.hpluv_l = this.lch_l;
}
this.hpluv_h = this.lch_h;
}

public void hsluvToRgb() {
this.hsluvToLch();
this.lchToLuv();
this.luvToXyz();
this.xyzToRgb();
}

public void hpluvToRgb() {
this.hpluvToLch();
this.lchToLuv();
this.luvToXyz();
this.xyzToRgb();
}

public void hsluvToHex() {
this.hsluvToRgb();
this.rgbToHex();
}

public void hpluvToHex() {
this.hpluvToRgb();
this.rgbToHex();
}

public void rgbToHsluv() {
this.rgbToXyz();
this.xyzToLuv();
this.luvToLch();
this.lchToHpluv();
this.lchToHsluv();
}

public void rgbToHpluv() {
this.rgbToXyz();
this.xyzToLuv();
this.luvToLch();
this.lchToHpluv();
this.lchToHpluv();
}

public void hexToHsluv() {
this.hexToRgb();
this.rgbToHsluv();
}

public void hexToHpluv() {
this.hexToRgb();
this.rgbToHpluv();
}
}
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