static Rgb hisToRgb(double h, double i, double s) {
double m1, m2, i1;
m1 = s * Math.sin(h * Math.PI / 180);
m2 = s * Math.cos(h * Math.PI / 180);
i1 = i / Math.sqrt(3);
Rgb rgb = new Rgb();
rgb.r = m1 * 2 / Math.sqrt(6) + i1 / Math.sqrt(3);
rgb.g = -m1 / Math.sqrt(6) + m2 / Math.sqrt(2) + i1 / Math.sqrt(3);
rgb.b = -m1 / Math.sqrt(6) - m2 / Math.sqrt(2) + i1 / Math.sqrt(3);
rgb.r = rgb.r / 2 + 0.5;
rgb.g = rgb.g / 2 + 0.5;
rgb.b = rgb.b / 2 + 0.5;
if (rgb.r > 1) rgb.r = 1;
if (rgb.r < 0) rgb.r = 0;
if (rgb.g > 1) rgb.g = 1;
if (rgb.g < 0) rgb.g = 0;
if (rgb.b > 1) rgb.b = 1;
if (rgb.b < 0) rgb.b = 0;
return rgb;
}
public static Color rgbColor(int idx) {
double gray_i0 = 0.32;
double gray_i1 = 0.95;
double h1, i1, s1;
double r, g, b;
int i, j, k;
Rgb rgb;
Color color = null;
if (idx == 300)
// TODO, should be background color
idx = 31;
if (idx < 4)
color =
new Color(
(int) (colorValues[3 * idx] * 255),
(int) (colorValues[3 * idx + 1] * 255),
(int) (colorValues[3 * idx + 2] * 255));
else if (idx < 20) {
h1 = 360. * (idx - 4) / 16;
s1 = 1.5;
i1 = 1;
rgb = hisToRgb(h1, i1, s1);
color = new Color((int) (rgb.r * 255), (int) (rgb.g * 255), (int) (rgb.b * 255));
} else if (idx < 60) {
int val;
if (idx < 30 || (50 <= idx && idx < 60)) gray_i0 = 0.25F;
val =
(int)
((gray_i0 + (gray_i1 - gray_i0) * Math.pow((double) (9 - idx % 10) / 9, 0.9)) * 255);
color = new Color(val, val, val);
} else if (idx < 300) {
double i_min, i_max, s, a, h, hk;
i = (idx - 60) / 30;
j = (idx - 60 - i * 30) / 10;
k = 9 - (idx - 60 - i * 30 - j * 10);
h = ctab[i * 14];
hk = ctab[i * 14 + 1];
s = ctab[i * 14 + 2 + j * 4];
i_min = ctab[i * 14 + 2 + j * 4 + 1];
i_max = ctab[i * 14 + 2 + j * 4 + 2];
a = ctab[i * 14 + 2 + j * 4 + 3];
s1 = s;
i1 = i_min + (i_max - i_min) * Math.pow((double) k / 9, a);
h1 = h + hk * k / 9;
if ((i == 0 && j == 2) || (i == 2 && j == 2 && k > 5)) {
// Formula doesn't work for yellow...
rgb = new Rgb();
rgb.r = rgbTab[(i * 10 + k) * 3];
rgb.g = rgbTab[(i * 10 + k) * 3 + 1];
rgb.b = rgbTab[(i * 10 + k) * 3 + 2];
} else rgb = hisToRgb(h1, i1, s1);
color = new Color((int) (rgb.r * 255), (int) (rgb.g * 255), (int) (rgb.b * 255));
}
return color;
}