#endregion
+ #region HSV
+
+ /// <summary>
+ /// Converts HSV color values to RGB color values.
+ /// </summary>
+ /// <returns>
+ /// Returns the converted color value.
+ /// </returns>
+ /// <param name="hsv">
+ /// Color value to convert in hue, saturation, value (HSV).
+ /// The X element is Hue (H), the Y element is Saturation (S), the Z element is Value (V), and the W element is Alpha (which is copied to the output's Alpha value).
+ /// Each has a range of 0.0 to 1.0.
+ /// </param>
+ public static Color4 FromHsv(Vector4 hsv)
+ {
+ var hue = hsv.X * 360.0f;
+ var saturation = hsv.Y;
+ var value = hsv.Z;
+
+ var C = value * saturation;
+
+ var h = hue / 60.0f;
+ var X = C * (1.0f - Math.Abs(h % 2.0f - 1.0f));
+
+ float r, g, b;
+ if (0.0f <= h && h < 1.0f)
+ {
+ r = C;
+ g = X;
+ b = 0.0f;
+ }
+ else if (1.0f <= h && h < 2.0f)
+ {
+ r = X;
+ g = C;
+ b = 0.0f;
+ }
+ else if (2.0f <= h && h < 3.0f)
+ {
+ r = 0.0f;
+ g = C;
+ b = X;
+ }
+ else if (3.0f <= h && h < 4.0f)
+ {
+ r = 0.0f;
+ g = X;
+ b = C;
+ }
+ else if (4.0f <= h && h < 5.0f)
+ {
+ r = X;
+ g = 0.0f;
+ b = C;
+ }
+ else if (5.0f <= h && h < 6.0f)
+ {
+ r = C;
+ g = 0.0f;
+ b = X;
+ }
+ else
+ {
+ r = 0.0f;
+ g = 0.0f;
+ b = 0.0f;
+ }
+
+ var m = value - C;
+ return new Color4(r + m, g + m, b + m, hsv.W);
+ }
+
+ /// <summary>
+ /// Converts RGB color values to HSV color values.
+ /// </summary>
+ /// <returns>
+ /// Returns the converted color value.
+ /// The X element is Hue (H), the Y element is Saturation (S), the Z element is Value (V), and the W element is Alpha (a copy of the input's Alpha value).
+ /// Each has a range of 0.0 to 1.0.
+ /// </returns>
+ /// <param name="rgb">Color value to convert.</param>
+ public static Vector4 ToHsv(Color4 rgb)
+ {
+ var M = Math.Max(rgb.R, Math.Max(rgb.G, rgb.B));
+ var m = Math.Min(rgb.R, Math.Min(rgb.G, rgb.B));
+ var C = M - m;
+
+ float h = 0.0f;
+ if (M == rgb.R)
+ {
+ h = ((rgb.G - rgb.B) / C) % 6.0f;
+ }
+ else if (M == rgb.G)
+ {
+ h = ((rgb.B - rgb.R) / C) + 2.0f;
+ }
+ else if (M == rgb.B)
+ {
+ h = ((rgb.R - rgb.G) / C) + 4.0f;
+ }
+
+ var hue = (h * 60.0f) / 360.0f;
+
+ var saturation = 0.0f;
+ if (0.0f != M)
+ {
+ saturation = C / M;
+ }
+
+ return new Vector4(hue, saturation, M, rgb.A);
+ }
+
+ #endregion
+
#endregion
#region IEquatable<Color4> Members