How to convert HSV to RGB in flutter - flutter

Question

I'm using this code to convert RGB to HSV.
now i have to revert back to RGB.
is that any way to convert this in flutter??
I just recently started working in flutter, please help me out, I'm stuck here.
Thank you so much in advance.
rgbToHsv(int r1, int g1, int b1) {
// R, G, B values are divided by 255
// to change the range from 0..255 to 0..1:
double r = r1 / 255.0;
double g = g1 / 255.0;
double b = b1 / 255.0;
// h, s, v = hue, saturation, value
var cmax = [r, g, b].reduce(max); // maximum of r, g, b
var cmin = [r, g, b].reduce(min); // minimum of r, g, b
var diff = cmax - cmin; // diff of cmax and cmin.
var h;
var s;
var v;
//Get value of h
if (cmax == cmin) {
h = 0;
} else if (cmax == r) {
h = (60 * ((g - b) / diff) + 360) % 360;
} else if (cmax == g) {
h = (60 * ((b - r) / diff) + 120) % 360;
} else if (cmax == b) {
h = (60 * ((r - g) / diff) + 240) % 360;
}
//Get value of s
if (cmax == 0) {
s = 0;
} else {
s = (diff / cmax) * 100;
}
//Get value of v
v = cmax * 100;
//Convert HSV [360, 100, 100] to HSV [256, 256, 256]
double h_256 = (h / 360) * 255;
double s_256 = (s / 100) * 255;
double v_256 = (v / 100) * 255;
int h_256_int = h_256.toInt();
int s_256_int = s_256.toInt();
int v_256_int = v_256.toInt();
//Convert to HSV HEX
var hex_h = h_256_int.toRadixString(16);
var hex_s = s_256_int.toRadixString(16);
var hex_v = v_256_int.toRadixString(16);
//MERGE HSV HEX
var finalColor = hex_h + hex_s + hex_v;
print("HSV HEX:" + finalColor.toUpperCase());
/////RGB TRANS>>>>>>>>>>>>>>>>>
////////RGB TRANS>>>>>>>>>>>>>>>>>
////////RGB TRANS>>>>>>>>>>>>>>>>>
////////RGB TRANS>>>>>>>>>>>>>>>>>
var _h = hextToint(hex_h);
var _s = hextToint(hex_s);
var _v = hextToint(hex_v);
print(_h);
print(_s);
print(_v);
print(hsvToRgb(_h.toDouble(), _s.toDouble(), _v.toDouble()));
//return rgb;
}

Answer 1

this might help. I have used this in one of my projects.
String hsvToRgb(double H, double S, double V) {
int R, G, B;
H /= 360;
S /= 100;
V /= 100;
if (S == 0) {
R = (V * 255).toInt();
G = (V * 255).toInt();
B = (V * 255).toInt();
} else {
double var_h = H * 6;
if (var_h == 6) var_h = 0; // H must be < 1
int var_i = var_h.floor(); // Or ... var_i =
// floor( var_h )
double var_1 = V * (1 - S);
double var_2 = V (1 - S (var_h - var_i));
double var_3 = V (1 - S (1 - (var_h - var_i)));
double var_r;
double var_g;
double var_b;
if (var_i == 0) {
var_r = V;
var_g = var_3;
var_b = var_1;
} else if (var_i == 1) {
var_r = var_2;
var_g = V;
var_b = var_1;
} else if (var_i == 2) {
var_r = var_1;
var_g = V;
var_b = var_3;
} else if (var_i == 3) {
var_r = var_1;
var_g = var_2;
var_b = V;
} else if (var_i == 4) {
var_r = var_3;
var_g = var_1;
var_b = V;
} else {
var_r = V;
var_g = var_1;
var_b = var_2;
}
R = (var_r * 255).toInt(); // RGB results from 0 to 255
G = (var_g * 255).toInt();
B = (var_b * 255).toInt();
}
String rs = R.toRadixString(16);
String gs = G.toRadixString(16);
String bs = B.toRadixString(16);
if (rs.length == 1) rs = "0" + rs;
if (gs.length == 1) gs = "0" + gs;
if (bs.length == 1) bs = "0" + bs;
return "#" + rs + gs + bs;
}

Answer 2

RGB to HSV
HSVColor rgbToHSV(int r, int g, int b, {double opacity = 1}) {
return HSVColor.fromColor(Color.fromRGBO(r, g, b, opacity));
}
HSV to RGB
List<int> hsvToRGB(HSVColor color) {
//convert to color
final c = color.toColor();
return [c.red, c.blue, c.green];
}
To use HSVColor use myHSVcolor.toColor().
More about HSV Color.

Answer 3

Expanding on Yeasin Sheikh answer
Flutter
RGB to HSV
HSVColor rgbToHSV(int r, int g, int b, {double opacity = 1}) {
return HSVColor.fromColor(Color.fromRGBO(r, g, b, opacity));
}
HSV to RGB
List<int> hsvToRGB(HSVColor color) {
//convert to color
final c = color.toColor();
return [c.red, c.blue, c.green];
}
To use HSVColor use myHSVcolor.toColor().
More about HSV Color.
Native Dart
Import color package
RGB to HSV
final RgbColor rgbColor = RgbColor(red, green, blue);
final HsvColor hsvColor = rgbColor.toHsvColor();
HSV to RGB
final HsvColor hsvColor = HsvColor(hueValue, saturationValue, valueValue)
final RgbColor rgbColor = hsvColor.toRgbColor();
HSVColor class is not supported in native dart so we are using a package for that with similar classes.