public void SetKeys(IEnumerable<GradientHSLColorKey> keys)
{
var gradientHSLKeys = keys as IList<GradientHSLColorKey> ?? keys.ToList();
curve = new ResponseCurveHSL(
gradientHSLKeys.Select(key => key.time),
gradientHSLKeys.Select(key => key.color));
}
/// <summary>
/// Constrcust a new HSL gradient.
/// </summary>
public GradientHSL()
{
curve = new ResponseCurveHSL(
new List<float> {0, 1},
new List<ColorHSL> {ColorHSL.White, ColorHSL.Black});
}