private void Update()
{
var h = this.hSlider.Value;
var s = this.sSlider.Value / 100.0;
var v = this.vSlider.Value / 100.0;
var hsv = HsvColor.FromHsv(h, s, v);
var c = hsv.ToRgb();
var l = Luminosity.FromRgb(c);
var w = l <= 128;
this.colorbox.Background = new SolidColorBrush(c);
this.colorbox.Foreground = w ? Brushes.White : Brushes.Black;
this.colorbox.Text = $"Color: {c}, Luminosity: {l}";
}
public static HsvColor RgbToHsv(Color c)
{
var max = Math.Max(Math.Max(c.R, c.G), c.B);
var min = Math.Min(Math.Min(c.R, c.G), c.B);
double h, s, v;
if (max == min)
{
h = 0;
}
else if (max == c.R)
{
h = (60 * (c.G - c.B) / ((double)max - min) + 360) % 360;
}
else if (max == c.G)
{
h = (60 * (c.B - c.R) / ((double)max - min)) + 120;
}
else if (max == c.B)
{
h = (60 * (c.R - c.G) / ((double)max - min)) + 240;
}
else
{
throw new ArgumentException();
}
if (max == 0)
{
s = 0;
}
else
{
s = ((max - min) / (double)max);
}
v = max / 255.0;
return(HsvColor.FromHsv(h, s, v));
}
public static Color Lighter(Color c)
{
var hsv = RgbToHsv(c);
return(HsvToRgb(HsvColor.FromHsv(hsv.H, hsv.S, Math.Min(1.0, hsv.V * 1.2))));
}
public static Color Darker(Color c)
{
var hsv = RgbToHsv(c);
return(HsvToRgb(HsvColor.FromHsv(hsv.H, hsv.S, hsv.V * 0.8)));
}