private static float Normalize(float hue, HueUnit hueUnit)
{
// Convert to turns
switch (hueUnit)
{
case HueUnit.Degrees:
hue /= 360;
break;
case HueUnit.Gradians:
hue /= 400;
break;
case HueUnit.Radians:
hue /= 2 * (float)Math.PI;
break;
}
// Normalize hue to range [0, 1)
hue = hue % 1;
if (hue < 0)
{
hue += 1;
}
return(hue);
}
public HueValue(float hue, HueUnit hueUnit)
{
var info = HueUnitInfo.Get(hueUnit);
var normalized = Normalize(hue, info.Period);
Suffix = info.Suffix;
Turns = normalized / info.Period;
Value = normalized;
}
public static HueUnitInfo Get(HueUnit hueUnit)
{
foreach (var unitInfo in Values)
{
if (unitInfo.Key == hueUnit)
{
return(unitInfo);
}
}
throw new ArgumentException($"Unknown hue unit {hueUnit}.", nameof(hueUnit));
}
public void Add(float hue, HueUnit hueUnit)
{
if (float.IsNaN(hue))
{
throw new ArgumentException("NaN is not a valid hue.", nameof(hue));
}
if (float.IsPositiveInfinity(hue))
{
throw new ArgumentException("Positive infinity is not a valid hue.", nameof(hue));
}
if (float.IsNegativeInfinity(hue))
{
throw new ArgumentException("Negative infinity is not a valid hue.", nameof(hue));
}
hues.Add(new HueValue(hue, hueUnit));
}
public bool Remove(float hue, HueUnit hueUnit)
{
return(hues.Remove(new HueValue(hue, hueUnit)));
}
public bool Contains(float hue, HueUnit hueUnit)
{
return(hues.Contains(new HueValue(hue, hueUnit)));
}
public HueUnitInfo(HueUnit key, string suffix, float period)
{
Key = key;
Suffix = suffix;
Period = period;
}
/// <summary>
/// Removes the specified hue from this collection.
/// </summary>
/// <param name="hue">Hue. Will be normalized to turns in the range [0, 1).</param>
/// <param name="hueUnit">The unit of <paramref name="hue"/>.</param>
/// <returns><c>true</c> if the hue was found and removed from the collection.</returns>
public bool Remove(float hue, HueUnit hueUnit)
{
return(hues.Remove(Normalize(hue, hueUnit)));
}
/// <summary>
/// Checks whether a specified hue exists in this collection.
/// </summary>
/// <param name="hue">Hue to find in the collection.</param>
/// <param name="hueUnit">Unit of <paramref name="hueUnit"/>.</param>
/// <returns><c>true</c> if found, otherwise <c>false</c>.</returns>
/// <remarks>
/// The specified hue will be normalized to turns in the range [0, 1). This means that if
/// you have added the hue 180 degrees to the collection and then asks this method if the hue
/// 1.5 turns is existing in the collection, it will return <c>true</c>.
/// </remarks>
public bool Contains(float hue, HueUnit hueUnit)
{
return(hues.Contains(Normalize(hue, hueUnit)));
}
