/// <summary>
/// HSLからRGBへ変換を行う。
/// </summary>
/// <param name="hsl">HSL色</param>
/// <param name="alpha">アルファ値(0≦alpha≦255)</param>
/// <returns>RGB色</returns>
public static Color ConvertHSLtoRGB(ColorHSL hsl, byte alpha)
{
float min = (hsl.Lightness < 0.5f)
? (hsl.Lightness - hsl.Lightness * (hsl.Saturation)) * 255.0f
: (hsl.Lightness - (1.0f - hsl.Lightness) * hsl.Saturation) * 255.0f;
float max = (hsl.Lightness < 0.5f)
? (hsl.Lightness + hsl.Lightness * (hsl.Saturation)) * 255.0f
: (hsl.Lightness + (1.0f - hsl.Lightness) * hsl.Saturation) * 255.0f;
int r, g, b;
if ((hsl.Hue >= 0) && (hsl.Hue < 60))
{
r = Convert.ToInt32(max);
g = Convert.ToInt32((hsl.Hue / 60.0f) * (max - min) + min);
b = Convert.ToInt32(min);
}
else if ((hsl.Hue >= 60) && (hsl.Hue < 120))
{
r = Convert.ToInt32(((120.0f - hsl.Hue) / 60.0f) * (max - min) + min);
g = Convert.ToInt32(max);
b = Convert.ToInt32(min);
}
else if ((hsl.Hue >= 120) && (hsl.Hue < 180))
{
r = Convert.ToInt32(min);
g = Convert.ToInt32(max);
b = Convert.ToInt32(((hsl.Hue - 120.0f) / 60.0f) * (max - min) + min);
}
else if ((hsl.Hue >= 180) && (hsl.Hue < 240))
{
r = Convert.ToInt32(min);
g = Convert.ToInt32(((240 - hsl.Hue) / 60.0f) * (max - min) + min);
b = Convert.ToInt32(max);
}
else if ((hsl.Hue >= 240) && (hsl.Hue < 300))
{
r = Convert.ToInt32(((hsl.Hue - 240) / 60.0f) * (max - min) + min);
g = Convert.ToInt32(min);
b = Convert.ToInt32(max);
}
else if ((hsl.Hue >= 300) && (hsl.Hue < 360))
{
r = Convert.ToInt32(max);
g = Convert.ToInt32(min);
b = Convert.ToInt32(((360 - hsl.Hue) / 60.0f) * (max - min) + min);
}
else
{
r = 0;
g = 0;
b = 0;
}
return(ColorUtility.GetColor(alpha, r, g, b));
}
/// <summary>
/// HSVの色調整を行ってピクセルデータを返す。
/// </summary>
/// <param name="c">カラー</param>
/// <param name="hue">色差加算値(-360≦hue≦360)</param>
/// <param name="saturation">彩度加割合(-255≦saturation≦255)</param>
/// <param name="lightness">輝度加算割合(-255≦lightness≦255)</param>
/// <returns></returns>
public static Color ProcessHSLFilter(Color c, int hue, int saturation, int lightness)
{
if (((hue == 0) && (saturation == 0) && (lightness == 0)))
{
return(c); // 色変換しない。
}
ColorHSL srcHSL = ColorConverter.ConvertRGBtoHSL(c);
float h = ColorUtility.GetHueWithLimitedRange((srcHSL.Hue + hue) % 360.0f);
float s = ColorUtility.ModifyValueByPercent(srcHSL.Saturation, 0f, 1.0f, saturation / 255.0f);
float l = Math.Min(ColorUtility.ModifyValueByPercent(srcHSL.Lightness, 0f, srcHSL.Lightness * 2, lightness / 255.0f), 1.0f);
return(ColorConverter.ConvertHSLtoRGB(ColorHSL.FromHSL(h, s, l), c.A));
}
/// <summary>
/// RGBからHSLへ変換を行う。
/// </summary>
/// <param name="rgb">RGB色</param>
/// <returns>HSL色</returns>
public static ColorHSL ConvertRGBtoHSL(Color rgb)
{
int min = Math.Min(rgb.G, Math.Min(rgb.B, rgb.R));
int max = Math.Max(rgb.G, Math.Max(rgb.B, rgb.R));
float hue = GetHue(rgb, min, max);
float lightness = ((min + max) / 2.0f) / 255.0f;
float saturation;
if (min == max)
{
saturation = 0.0f;
}
else
{
saturation = (lightness < 0.5)
? (float)(max - min) / (float)(max + min)
: (float)(max - min) / (2 * 255.0f - max - min);
}
return(ColorHSL.FromHSL(hue, saturation, lightness));
}
/// <summary>
/// colorHSVで指定される色と一致しているかどうかを判定する。
/// </summary>
/// <param name="colorHSL">色</param>
/// <returns>同値なものである場合にはtrue, それ以外はfalse</returns>
public bool Equals(ColorHSL colorHSL)
{
return((colorHSL.Hue == Hue) && (colorHSL.Saturation == Saturation) && (colorHSL.Lightness == Lightness));
}
/// <summary>
/// HSLからRGBへ変換を行う。
/// </summary>
/// <param name="hsl">HSL色</param>
/// <param name="alpha">アルファ値(0≦alpha≦1.0)</param>
/// <returns>RGB色</returns>
public static Color ConvertHSLtoRGB(ColorHSL hsl, float alpha)
{
int a = Convert.ToInt32(ColorUtility.Clamp(alpha * 255.0f, 0.0f, 255.0f));
return(ConvertHSLtoRGB(hsl, (byte)(a)));
}
/// <summary> /// HSLからRGBへ変換を行う。 /// </summary> /// <param name="hsl">HSL色</param> /// <returns>RGB色</returns> public static Color ConvertHSLtoRGB(ColorHSL hsl) => ConvertHSLtoRGB(hsl, hsl.Alpha);
