/// <summary>色情報を入力する</summary>
/// <param name="buf">カラー配列</param>
private void SetColor(byte[] buf)
{
Random rnd = new Random();
List <Point3D>[] colorLists = new List <Point3D> [colors.Length];
for (int i = 0; i < colorLists.Length; i++)
{
colorLists[i] = new List <Point3D>();
}
HashSet <Point3D> hash = new HashSet <Point3D>();
for (int i = 0; i < buf.Length; i += 4)
{
int n = rnd.Next(0, colors.Length);
LAB lab = LAB.FromRGB(buf[i + 0], buf[i + 1], buf[i + 2]);
Point3D point = new Point3D(lab.L, lab.A, lab.B);
if (hash.Add(point))
{
colorLists[n].Add(point);
}
}
for (int i = 0; i < colors.Length; i++)
{
colors[i] = colorLists[i];
}
}
/// <summary>Colorクラスを作成する</summary>
/// <param name="c">色</param>
/// <returns>RGBの色<see cref="Color"/></returns>
public static Color ToRGB(LAB c)
{
double y = (c.L + 16) / 116;
double x = c.A / 500 + y;
double z = y - c.B / 200;
double Xn = 98.072;
double Yn = 100.000;
double Zn = 118.225;
double[] xyz = new double[3];
xyz[0] = Math.Pow(x, 3) * Xn;
xyz[1] = Math.Pow(y, 3) * Yn;
xyz[2] = Math.Pow(z, 3) * Zn;
xyz[0] /= 100;
xyz[1] /= 100;
xyz[2] /= 100;
double[] srgb = new double[3];
srgb[0] = 3.5064 * xyz[0] - 1.7400 * xyz[1] - 0.5441 * xyz[2];
srgb[1] = -1.0690 * xyz[0] + 1.9777 * xyz[1] + 0.0352 * xyz[2];
srgb[2] = 0.0563 * xyz[0] - 0.1970 * xyz[1] + 1.0511 * xyz[2];
double[] rgb = new double[3];
rgb[0] = Math.Pow(srgb[0], 1 / 2.2);
rgb[1] = Math.Pow(srgb[1], 1 / 2.2);
rgb[2] = Math.Pow(srgb[2], 1 / 2.2);
byte r = (byte)(rgb[0] * 255);
byte g = (byte)(rgb[1] * 255);
byte b = (byte)(rgb[2] * 255);
return(Color.FromArgb(r, g, b));
}
/// <summary>カラー配列の置き換え</summary>
/// <param name="buf">カラー配列</param>
private void Replace(byte[] buf)
{
for (int i = 0; i < buf.Length; i += 4)
{
LAB lab = LAB.FromRGB(buf[i + 0], buf[i + 1], buf[i + 2]);
Point3D c = new Point3D(lab.L, lab.A, lab.B);
int min = 0;
double minR = double.MaxValue;
for (int k = 0; k < center.Length; k++)
{
double r = Range(c, center[k]);
if (minR > r)
{
min = k;
minR = r;
}
}
Color color = LAB.ToRGB(LAB.FromLAB(center[min].X, center[min].Y, center[min].Z));
buf[i + 0] = color.R;
buf[i + 1] = color.G;
buf[i + 2] = color.B;
}
}