public void HSLtoRGBTest()
{
var hsl = new HSL { H = 0.61082024432809767, L = 1.0, S = 0.74901960784313726 };
var rgb = ColorUtilities.HSLtoRGB(hsl);
Assert.AreEqual(255, rgb.A);
Assert.AreEqual(64, rgb.R);
Assert.AreEqual(128, rgb.G);
Assert.AreEqual(255, rgb.B);
}
public void TestProperties()
{
var hsl = new HSL { H = 0.5 };
Assert.AreEqual(0.5, hsl.H);
hsl.L = 0.5;
Assert.AreEqual(0.5, hsl.L);
hsl.S = 0.5;
Assert.AreEqual(0.5, hsl.S);
}
public void ValuesShouldNotBeLowerThan0()
{
var hsl = new HSL { H = -2.0 };
Assert.AreEqual(0.0, hsl.H);
hsl.L = -2.0;
Assert.AreEqual(0.0, hsl.L);
hsl.S = -2.0;
Assert.AreEqual(0.0, hsl.S);
}
public void ValuesShouldNotBeHigherThan1()
{
var hsl = new HSL { H = 2.0 };
Assert.AreEqual(1.0, hsl.H);
hsl.L = 2.0;
Assert.AreEqual(1.0, hsl.L);
hsl.S = 2.0;
Assert.AreEqual(1.0, hsl.S);
}
/// <summary>
/// Rgs the bto HSL.
/// </summary>
/// <param name="c">The c.</param>
/// <returns>HSL.</returns>
public static HSL RGBtoHSL(Color c)
{
var hsl = new HSL();
int max, min;
//Of our RGB values, assign the highest value to Max, and the Smallest to Min
if (c.R > c.G)
{
max = c.R;
min = c.G;
}
else
{
max = c.G;
min = c.R;
}
if (c.B > max) max = c.B;
else if (c.B < min) min = c.B;
int diff = max - min;
//Luminance - a.k.a. Brightness - Adobe photoshop uses the logic that the
//site VBspeed regards (regarded) as too primitive = superior decides the
//level of brightness.
hsl.L = (double)max / 255;
//Saturation
if (max == 0) hsl.S = 0; //Protecting from the impossible operation of division by zero.
else hsl.S = (double)diff / max; //The logic of Adobe Photoshops is this simple.
//Hue R is situated at the angel of 360 eller noll degrees;
// G vid 120 degrees
// B vid 240 degrees
double q;
if (diff == 0) q = 0; // Protecting from the impossible operation of division by zero.
else q = (double)60 / diff;
if (max == c.R)
{
hsl.H = c.G < c.B ? (360 + (q * (c.G - c.B))) / 360 : (q * (c.G - c.B)) / 360;
}
else if (max == c.G) hsl.H = (120 + (q * (c.B - c.R))) / 360;
else if (max == c.B) hsl.H = (240 + (q * (c.R - c.G))) / 360;
else hsl.H = 0.0;
return hsl;
}
/// <summary>
/// Hses the lto RGB.
/// </summary>
/// <param name="hsl">The HSL.</param>
/// <returns>Color.</returns>
public static Color HSLtoRGB(HSL hsl)
{
return HSLtoRGB(hsl.H, hsl.S, hsl.L);
}
