Converts HSV values to RGB values.

List<int> hsvToRgb(num hue, num saturation, num value) {
 double h = hue.toDouble();
 double s = saturation.toDouble();
 double v = value.toDouble();
 double r, g, b;

 int i = (h * 6).toInt();
 double f = h * 6 - i;
 double p = v * (1 - s);
 double q = v * (1 - f * s);
 double t = v * (1 - (1 - f) * s);

 switch(i % 6) {
   case 0:
     r = v; g = t; b = p;
     break;
   case 1:
     r = q; g = v; b = p;
     break;
   case 2:
     r = p; g = v; b = t;
     break;
   case 3:
     r = p; g = q; b = v;
     break;
   case 4:
     r = t; g = p; b = v;
     break;
   case 5:
     r = v; g = p; b = q;
     break;
 }

 return [(r * 255 + 0.5).toInt(), (g * 255 + 0.5).toInt(), (b * 255 + 0.5).toInt()];
}

Converts HSV values to RGB values.

List<int> hsvListToRgb(List<num> hsv) => hsvToRgb(hsv[0], hsv[1], hsv[2]);

Converts RGB values to HSV values.

List<double> rgbToHsv(int red, int green, int blue) {
 int maxv = max(max(red, green), blue),
     minv = min(min(red, green), blue);
 double h, s, v = maxv / 255;

 var d = maxv - minv;
 s = maxv == 0.0 ? 0.0 : d / maxv;

 if(maxv == minv) {
   h = 0.0; // achromatic
 } else {
   switch(maxv) {
     case red:
       h = (green - blue) / d + (green < blue ? 6 : 0);
       break;
     case green:
       h = (blue - red) / d + 2;
       break;
     case blue:
       h = (red - green) / d + 4;
       break;
   }
   h /= 6.0;
 }

 return [h, s, v];
}

Converts RGB values to HSV values.

List<double> rgbListToHsv(List<int> rgb) => rgbToHsv(rgb[0], rgb[1], rgb[2]);

Converts HSL values to RGB values.

List<int> hslToRgb(num hue, num saturation, num lightness) {
 double h = hue.toDouble();
 double s = saturation.toDouble();
 double l = lightness.toDouble();
 double r;
 double g;
 double b;

 if(s == 0.0) {
   r = g = b = l; // achromatic
 } else {
   Function hue2rgb = (num p, num q, num t) {
     if(t < 0) t += 1;
     if(t > 1) t -= 1;
     if(t < 1 / 6) return p + (q - p) * 6 * t;
     if(t < 1 / 2) return q;
     if(t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
     return p;
   };

   num q = l < 0.5 ? l * (1 + s) : l + s - l * s;
   num p = 2 * l - q;
   r = hue2rgb(p, q, h + 1 / 3);
   g = hue2rgb(p, q, h);
   b = hue2rgb(p, q, h - 1 / 3);
 }

 return [(r * 255 + 0.5).toInt(), (g * 255 + 0.5).toInt(), (b * 255 + 0.5).toInt()];
}

Converts HSL values to RGB values.

List<int> hslListToRgb(List<num> hsl) => hslToRgb(hsl[0], hsl[1], hsl[2]);

Converts RGB values to HSL values.

List<double> rgbToHsl(int red, int green, int blue) {
 int maxv = max(max(red, green), blue),
     minv = min(min(red, green), blue);
 double h, s, l = (maxv + minv) / (2*255);

 if(maxv == minv) {
   h = s = 0.0; // achromatic
 } else {
   num d = maxv - minv;
   s = l > 0.5 ? d / (2*255 - maxv - minv) : d / (maxv + minv);
   switch(maxv) {
     case red:
       h = (green - blue) / d + (green < blue ? 6 : 0);
       break;
     case green:
       h = (blue - red) / d + 2;
       break;
     case blue:
       h = (red - green) / d + 4;
       break;
   }
   h /= 6.0;
 }
 return [h, s, l];
}

Converts RGB values to HSL values.

List<double> rgbListToHsl(List<int> rgb) => rgbToHsl(rgb[0], rgb[1], rgb[2]);

Converts RGB values to a hexadecimal string.

String rgbToHex(int r, int g, int b) {
 return '#${((1 << 24) + (r << 16) + (g << 8) + b).toRadixString(16).substring(1, 7)}';
}

Converts a hexadecimal presentation of a color (#123456) into a list of RGB-values.

List<int> hexToRgb(String hex) {
 return [int.parse('0x${hex[1]}${hex[2]}'), int.parse('0x${hex[3]}${hex[4]}'), int.parse('0x${hex[5]}${hex[6]}')];
}