/// <summary>
/// Changes the intensity.
/// </summary>
/// <param name="color">The color.</param>
/// <param name="factor">The factor.</param>
/// <returns>A color with the new intensity.</returns>
public static OxyColor ChangeIntensity(this OxyColor color, double factor)
{
var hsv = color.ToHsv();
hsv[2] *= factor;
if (hsv[2] > 1.0)
{
hsv[2] = 1.0;
}
return(OxyColor.FromHsv(hsv));
}
/// <summary>
/// Changes the intensity.
/// </summary>
/// <param name="color">The color.</param>
/// <param name="factor">The factor.</param>
/// <returns>A color with the new intensity.</returns>
public static OxyColor ChangeSaturation(this OxyColor color, double factor)
{
var hsv = color.ToHsv();
hsv[1] *= factor;
if (hsv[1] > 1.0)
{
hsv[1] = 1.0;
}
return(OxyColor.FromHsv(hsv));
}
/// <summary>
/// Calculates the complementary color.
/// </summary>
/// <param name="color">The color to convert.</param>
/// <returns>The complementary color.</returns>
public static OxyColor Complementary(this OxyColor color)
{
// http://en.wikipedia.org/wiki/Complementary_Color
var hsv = color.ToHsv();
double newHue = hsv[0] - 0.5;
// clamp to [0,1]
if (newHue < 0)
{
newHue += 1.0;
}
return(OxyColor.FromHsv(newHue, hsv[1], hsv[2]));
}
/// <summary>
/// Calculate the difference in hue between two <see cref="OxyColor"/>s.
/// </summary>
/// <param name="c1">
/// The first color.
/// </param>
/// <param name="c2">
/// The second color.
/// </param>
/// <returns>
/// The hue difference.
/// </returns>
public static double HueDifference(OxyColor c1, OxyColor c2)
{
var hsv1 = c1.ToHsv();
var hsv2 = c2.ToHsv();
double dh = hsv1[0] - hsv2[0];
// clamp to [-0.5,0.5]
if (dh > 0.5)
{
dh -= 1.0;
}
if (dh < -0.5)
{
dh += 1.0;
}
double e = dh * dh;
return(Math.Sqrt(e));
}
/// <summary>
/// Calculate the difference in hue between two <see cref="OxyColor" />s.
/// </summary>
/// <param name="c1">The first color.</param>
/// <param name="c2">The second color.</param>
/// <returns>The hue difference.</returns>
public static double HueDifference(OxyColor c1, OxyColor c2)
{
var hsv1 = c1.ToHsv();
var hsv2 = c2.ToHsv();
double dh = hsv1[0] - hsv2[0];
// clamp to [-0.5,0.5]
if (dh > 0.5)
{
dh -= 1.0;
}
if (dh < -0.5)
{
dh += 1.0;
}
double e = dh * dh;
return Math.Sqrt(e);
}
