public static dynamic ToRgb(float h, float s, float v, SaturationModelType saturationModel = SaturationModelType.Cylinder)
{
// ※HSV/RGBを0.0～1.0の浮動小数点数で表現した円柱モデルの場合
float r = v;
float g = v;
float b = v;
if (s > 0.0f)
{
//h *= 6.0f;
float h2 = h / 60.0f;
int i = (int)h2;
float f = h2 - (float)i;
switch (i)
{
default:
case 0:
g *= 1 - s * (1 - f);
b *= 1 - s;
break;
case 1:
r *= 1 - s * f;
b *= 1 - s;
break;
case 2:
r *= 1 - s;
b *= 1 - s * (1 - f);
break;
case 3:
r *= 1 - s;
g *= 1 - s * f;
break;
case 4:
r *= 1 - s * (1 - f);
g *= 1 - s;
break;
case 5:
g *= 1 - s;
b *= 1 - s * f;
break;
}
if (SaturationModelType.Cone == saturationModel)
{
r /= v;
g /= v;
b /= v;
}
}
return(new { R = (int)(r * 255), G = (int)(g * 255), B = (int)(b * 255) });
}
public static dynamic ToHsv(int R, int G, int B, SaturationModelType saturationModel = SaturationModelType.Cylinder)
{
if (R < 0 || G < 0 || B < 0)
{
throw new ArgumentException("RGB値は0～255の範囲です。");
}
if (255 < R || 255 < G || 255 < B)
{
throw new ArgumentException("RGB値は0～255の範囲です。");
}
//if (((R < 0 || G < 0 || B < 0) || (255 < R || 255 < G || 255 < B))) { throw new ArgumentException("RGB値は0～255の範囲です。"); }
//object hsv = new { H = 0, S = 0, V = 0 };
//dynamic hsv = new { H = 0, S = 0, V = 0 };
dynamic hsv = new System.Dynamic.ExpandoObject();
float r = (float)R / 255.0f;
float g = (float)G / 255.0f;
float b = (float)B / 255.0f;
float min = Math.Min(Math.Min(r, g), b);
float max = Math.Max(Math.Max(r, g), b);
hsv.V = max;
if (0 == max)
{
hsv.S = 0;
}
else
{
if (SaturationModelType.Cone == saturationModel)
{
hsv.S = max - min;
}
else
{
hsv.S = (max - min) / max;
}
}
if (min == max)
{
hsv.H = 0;
}
else
{
if (min == b)
{
hsv.H = 60 * ((g - r) / (max - min)) + 60;
}
else if (min == r)
{
hsv.H = 60 * ((b - g) / (max - min)) + 180;
}
else // if (min == g)
{
hsv.H = 60 * ((r - b) / (max - min)) + 300;
}
if (hsv.H < 0 || 360 < hsv.H)
{
hsv.H %= 360;
}
//if (hsv.H < MinH || MaxH < hsv.H) { hsv.H %= MaxH; }
}
return(hsv);
}