/// <summary>
/// Method to find a color that is most
/// </summary>
/// <param name="colors">An array of color values</param>
/// <param name="color">A color</param>
/// <returns>The color that matches <paramref name="color"/> most.</returns>
public static System.Drawing.Color FindNearestColor(
this IList <System.Drawing.Color> colors,
System.Drawing.Color color)
{
var hlsColor = (HlsColor)color;
var distance = double.MaxValue;
var resColor = new HlsColor();
if (colors == null || colors.Count == 0)
{
throw new ArgumentException("colors");
}
foreach (var c in colors)
{
var testHlsColor = (HlsColor)c;
var d = hlsColor.Distance(testHlsColor);
if (d < distance)
{
distance = d;
if (distance == 0d)
{
return(testHlsColor);
}
resColor = testHlsColor;
}
}
return(resColor);
}
static ColorExtensions()
{
var p = new List <string>();
for (int i = 0; i <= 255; i += 15)
{
string sc = "#" + string.Format("{0:X2}{1:X2}{2:X2}", i, i, i);
p.Add(sc);
}
p.Add("#FF0000");
p.Add("#00FF00");
p.Add("#0000FF");
p.Add("#FFFF00");
p.Add("#00FFFF");
p.Add("#FF00FF");
p.Add("#C0C0C0");
for (var h = 0f; h < 360f; h += 10f)
{
for (var l = 0.25f; l <= 0.75; l += 1f / 16f)
{
System.Drawing.Color c = new HlsColor {
H = h, L = l, S = 1f
};
var sc = "#" + string.Format("{0:X2}{1:X2}{2:X2}", c.R, c.G, c.B);
p.Add(sc);
}
}
TomPaletteBase = p.ToArray();
}
/// <summary>
/// Computes the weighted euclidian distance to <paramref name="other"/> color
/// </summary>
/// <param name="other">The other color</param>
/// <returns>The distance</returns>
public double Distance(HlsColor other)
{
var h = (H - other.H) * 1d;
var l = (L - other.L) * 100d;
var s = (S - other.S) * 100d;
h = 0.5d * h * h;
l *= l;
s = 0.5d * s * s;
return(Math.Sqrt(h + l + s));
}
private void tomChannel_ValueChange(object sender, EventArgs e)
{
System.Drawing.Color newColor = System.Drawing.Color.Empty;
switch (_colorModel)
{
case ColorModel.RGB:
newColor = System.Drawing.Color.FromArgb(
Convert.ToByte(_channel4.Value),
Convert.ToByte(_channel1.Value),
Convert.ToByte(_channel2.Value),
Convert.ToByte(_channel3.Value));
break;
case ColorModel.CMYK:
var cmykColor = new CmykColor
{
C = (byte)_channel1.Value,
M = (byte)_channel2.Value,
Y = (byte)_channel3.Value,
K = (byte)_channel4.Value
};
newColor = System.Drawing.Color.FromArgb(Convert.ToByte(_channel5.Value), cmykColor);
break;
case ColorModel.HSL:
var hlsColor = new HlsColor
{
H = _channel1.Value,
L = _channel2.Value,
S = _channel3.Value
};
var tmpColor = new HlsColor {
H = hlsColor.H, L = 0.5f, S = 1f
};
_channel2.Color1 = tmpColor;
_channel3.Color1 = tmpColor;
newColor = System.Drawing.Color.FromArgb(Convert.ToByte(_channel4.Value), hlsColor);
break;
}
SelectedColor = newColor;
}
