/// <summary>
/// Negate a spectrum
/// </summary>
/// <param name="s">the spectrum to negate</param>
/// <returns>the negated spectrum</returns>
public static CoefficientSpectrum operator -(CoefficientSpectrum s)
{
var resultSpectrum = new CoefficientSpectrum(s._nsamples);
for (var i = 0; i < s._nsamples; ++i)
{
resultSpectrum._samples[i] = -resultSpectrum._samples[i];
}
return(resultSpectrum);
}
/// <summary>
/// Add a spectrum and a value
/// </summary>
/// <param name="s1">the left spectrum</param>
/// <param name="value"></param>
/// <returns>the new spectrum</returns>
public static CoefficientSpectrum operator +(CoefficientSpectrum s1, float value)
{
var resultSpectrum = new CoefficientSpectrum(s1._nsamples);
for (var i = 0; i < s1._nsamples; ++i)
{
resultSpectrum._samples[i] = s1._samples[i] + value;
}
return(resultSpectrum);
}
/// <summary>
/// Clamp a spectrum
/// </summary>
/// <param name="s">the spectrum to clamp</param>
/// <param name="low">the minimum value</param>
/// <param name="high">the maximum value</param>
/// <returns>the clamped spectrum</returns>
public static CoefficientSpectrum Clamp(CoefficientSpectrum s, float low = 0,
float high = float.PositiveInfinity)
{
var result = new CoefficientSpectrum(s._nsamples);
for (var i = 0; i < s._nsamples; ++i)
{
result._samples[i] = result._samples[i] < low ? low : (result._samples[i] > high ? high : low);
}
return(result);
}
/// <summary>
/// Multiply two spectrums together.
/// </summary>
/// <param name="s1">the left spectrum</param>
/// <param name="s2">the right spectrum</param>
/// <returns>the new spectrum</returns>
public static CoefficientSpectrum operator *(CoefficientSpectrum s1, CoefficientSpectrum s2)
{
if (s1._nsamples != s2._nsamples)
{
throw new Exception("Spectrums do not have the same number of samples");
}
var resultSpectrum = new CoefficientSpectrum(s1._nsamples);
for (var i = 0; i < s1._nsamples; ++i)
{
resultSpectrum._samples[i] = s1._samples[i] * s2._samples[i];
}
return(resultSpectrum);
}
/// <summary>
/// Perform linear interpolation on two spectrums
/// </summary>
/// <param name="s1">the first spectrum</param>
/// <param name="s2">the second spectrum</param>
/// <param name="t">the time value</param>
/// <returns>the new spectrum</returns>
public CoefficientSpectrum Lerp(CoefficientSpectrum s1, CoefficientSpectrum s2, float t)
{
return(s1 * (1f - t) + s2 * t);
}
