@Override
public void fromRgb(final Rgb srcColor, final ColorSpace3D dstColor) {
double arithmeticR = srcColor.getFirstChannel() / MAX_RGB;
double arithmeticG = srcColor.getSecondChannel() / MAX_RGB;
double arithmeticB = srcColor.getThirdChannel() / MAX_RGB;
double max = Math.max(arithmeticR, Math.max(arithmeticG, arithmeticB));
double min = Math.min(arithmeticR, Math.min(arithmeticG, arithmeticB));
double delta = max - min;
double h = 0;
if (delta >= EPS) {
if (max == arithmeticR) {
h = DEGREES * ((arithmeticG - arithmeticB) / delta % R_DIVIDER);
} else if (max == arithmeticG) {
h = DEGREES * ((arithmeticB - arithmeticR) / delta + G_OFFSET);
} else if (max == arithmeticB) {
h = DEGREES * ((arithmeticR - arithmeticG) / delta + B_OFFSET);
}
}
double s = max <= 0 ? 0 : 1 - min / max;
double v = max;
dstColor.setChannels(h, s, v);
}
@Override
public Rgb toRgbColor(final ColorSpace3D srcColor) {
double h = srcColor.getFirstChannel();
double s = srcColor.getSecondChannel();
double v = srcColor.getThirdChannel();
final double degrees = 60.0;
final double maxRGB = 255.0;
final int numberOfSection = 6;
int section = (int) (Math.floor(h / degrees)) % numberOfSection;
double fractionalPartOfHue = h / degrees - Math.floor(h / degrees);
double p = v * (1 - s);
double q = v * (1 - fractionalPartOfHue * s);
double t = v * (1 - (1 - fractionalPartOfHue) * s);
final int firstSection = 0;
final int secondSection = 1;
final int thirdSection = 2;
final int fourthSection = 3;
final int fifthSection = 4;
double r, g, b;
switch (section) {
case firstSection:
r = v;
g = t;
b = p;
break;
case secondSection:
r = q;
g = v;
b = p;
break;
case thirdSection:
r = p;
g = v;
b = t;
break;
case fourthSection:
r = p;
g = q;
b = v;
break;
case fifthSection:
r = t;
g = p;
b = v;
break;
default:
r = v;
g = p;
b = q;
}
return new Rgb(r * maxRGB, g * maxRGB, b * maxRGB);
}
