rgb static method
Implementation
static Color rgb(int r, int g, int b) {
if (r > 255 || g > 255 || b > 255) {
throw ArgumentError('r, g and b need to be in the rage 0-255');
}
var rh = r.toRadixString(16).padLeft(2, '0');
var gh = r.toRadixString(16).padLeft(2, '0');
var bh = r.toRadixString(16).padLeft(2, '0');
return Color(rh + gh + bh);
}