public void SetValue(float value, PanFormulaEnum formula)
{
value = SynthHelper.ClampF(value, -1, 1);
double dvalue;
switch (formula)
{
case PanFormulaEnum.Neg3dBCenter:
dvalue = SynthConstants.HalfPi * (value + 1) / 2.0;
Left = (float)Math.Cos(dvalue);
Right = (float)Math.Sin(dvalue);
break;
case PanFormulaEnum.Neg6dBCenter:
Left = (float)(.5 + value * -.5);
Right = (float)(.5 + value * .5);
break;
case PanFormulaEnum.ZeroCenter:
dvalue = SynthConstants.HalfPi * (value + 1.0) / 2.0;
Left = (float)(Math.Cos(dvalue) / SynthConstants.InverseSqrtOfTwo);
Right = (float)(Math.Sin(dvalue) / SynthConstants.InverseSqrtOfTwo);
break;
default:
throw new Exception("Invalid pan law selected.");
}
}
private static SampleArray CreateExponentialTable(int size, float coeff)
{
coeff = SynthHelper.ClampF(coeff, .001f, .9f);
var graph = new SampleArray(size);
var val = 0.0;
for (int x = 0; x < size; x++)
{
graph[x] = (float)val;
val += coeff * ((1 / 0.63) - val);
}
for (int x = 0; x < size; x++)
{
graph[x] = graph[x] / graph[graph.Length - 1];
}
return(graph);
}
private static SampleArray CreateSquareTable(int size, int k)
{//Uses Fourier Expansion up to k terms
var FourOverPi = 4 / Math.PI;
var squaretable = new SampleArray(size);
var inc = 1.0 / size;
var phase = 0.0;
for (int x = 0; x < size; x++)
{
var value = 0.0;
for (int i = 1; i < k + 1; i++)
{
var twokminus1 = (2 * i) - 1;
value += Math.Sin(SynthConstants.TwoPi * (twokminus1) * phase) / (twokminus1);
}
squaretable[x] = SynthHelper.ClampF((float)(FourOverPi * value), -1, 1);
phase += inc;
}
return(squaretable);
}
