public static HSLColour ToHSL(this HSVColour hsv)
{
if (hsv.S == ColourSpaceConstants.ZERO)
{
return(new HSLColour(hsv.H, hsv.V, hsv.V, hsv.A));
}
var s = 0;
var l = 0;
return(new HSLColour(hsv.H, s, l, hsv.A));
}
public static SRGBColour ToSRGB(this HSVColour hsv)
{
var r = new UnitColourComponent(ColourSpaceConstants.ZERO);
var g = new UnitColourComponent(ColourSpaceConstants.ZERO);
var b = new UnitColourComponent(ColourSpaceConstants.ZERO);
// https://en.wikipedia.org/wiki/HSL_and_HSV#From_HSV
// http://www.easyrgb.com/en/math.php
if (hsv.S == ColourSpaceConstants.ZERO)
{
var vb = hsv.V.ToByteColour();
return(new SRGBColour(vb, vb, vb, hsv.A.ToByteColour()));
}
// Calcs simplified from Wikipedia and verified to match calcs at EasyRGB
var h_unit = hsv.H.Value / ColourSpaceConstants.SIXTY;
while (h_unit >= ColourSpaceConstants.SIX)
{
h_unit -= ColourSpaceConstants.SIX;
}
var h_int = Math.Floor(h_unit);
var v = hsv.V.ToByteColour();
var var_1 = ((UnitColourComponent)(hsv.V.Value * (ColourSpaceConstants.ONE - hsv.S.Value))).ToByteColour(); // 0 + m
var var_2 = ((UnitColourComponent)(hsv.V.Value * (ColourSpaceConstants.ONE - hsv.S.Value * (h_unit - h_int)))).ToByteColour(); // m + X (1<=H<=2, 3<=H<=4, 5<=H<=6)
var var_3 = ((UnitColourComponent)(hsv.V.Value * (ColourSpaceConstants.ONE - hsv.S.Value * (1 - (h_unit - h_int))))).ToByteColour(); // m + X (0<=H<=1, 2<=H<=3, 4<=H<=5)
switch (h_int)
{
case 0: return(new SRGBColour(v, var_3, var_1, hsv.A.ToByteColour()));
case 1: return(new SRGBColour(var_2, v, var_1, hsv.A.ToByteColour()));
case 2: return(new SRGBColour(var_1, v, var_3, hsv.A.ToByteColour()));
case 3: return(new SRGBColour(var_1, var_2, v, hsv.A.ToByteColour()));
case 4: return(new SRGBColour(var_3, var_1, v, hsv.A.ToByteColour()));
default: return(new SRGBColour(v, var_1, var_2, hsv.A.ToByteColour()));
}
}
