/// <summary>
/// Finds the closest color in this palette to the specified <paramref name="color"/>
/// </summary>
/// <param name="color">Color to use to find the closest color</param>
/// <returns>Index of the closest entry of the specified <paramref name="color"/></returns>
public int FindClosest(Color color)
{
int closestIndex = 0;
var colorHsl = new ColorHSL(color);
var closestDifference = ColorHSL.Distance(colorHsl, new ColorHSL(this[0]));
for (int i = 1; i < Count; i++)
{
var curDifference = ColorHSL.Distance(colorHsl, new ColorHSL(this[i]));
if (curDifference < closestDifference)
{
closestIndex = i;
closestDifference = curDifference;
}
if (Math.Abs(curDifference) < 0.001f)
{
break;
}
}
return(closestIndex);
}
public Color (ColorHSL hsl)
: this()
{
if (hsl.S == 0) {
// achromatic color (gray scale)
R = G = B = hsl.L;
} else {
float q = (hsl.L < 0.5f) ? (hsl.L * (1f + hsl.S)) : (hsl.L + hsl.S - (hsl.L * hsl.S));
float p = (2f * hsl.L) - q;
float Hk = hsl.H / 360f;
float[] T = new float[3];
T [0] = Hk + (1f / 3f); // Tr
T [1] = Hk; // Tb
T [2] = Hk - (1f / 3f); // Tg
for (int i=0; i<3; i++) {
if (T [i] < 0)
T [i] += 1f;
if (T [i] > 1)
T [i] -= 1f;
if ((T [i] * 6f) < 1) {
T [i] = p + ((q - p) * 6f * T [i]);
} else if ((T [i] * 2f) < 1) { //(1.0/6.0)<=T[i] && T[i]<0.5
T [i] = q;
} else if ((T [i] * 3f) < 2) { // 0.5<=T[i] && T[i]<(2.0/3.0)
T [i] = p + (q - p) * ((2f / 3f) - T [i]) * 6f;
} else
T [i] = p;
}
R = T [0];
G = T [1];
B = T [2];
}
A = hsl.A;
}
public Color(ColorHSL hsl)
: this(hsl.ToColor())
{
}
public static float Distance (ColorHSL value1, ColorHSL value2)
{
return (float)Math.Sqrt (Math.Pow ((value1.H - value2.H) / 360f, 2) + Math.Pow (value1.S - value2.S, 2) + Math.Pow (value1.L - value2.L, 2));
}
