Mat CreateBuffer(int bufferLength, long sampleOffset, double frequency, double phase)
{
var buffer = new double[bufferLength];
if (frequency > 0)
{
var period = 1.0 / frequency;
var waveform = Waveform;
switch (waveform)
{
default:
case FunctionWaveform.Sine:
frequency = frequency * TwoPI;
for (int i = 0; i < buffer.Length; i++)
{
buffer[i] = Math.Sin(frequency * (i + sampleOffset) + phase);
}
break;
case FunctionWaveform.Triangular:
phase = NormalizedPhase(phase) / TwoPI;
for (int i = 0; i < buffer.Length; i++)
{
var t = frequency * (i + sampleOffset + period / 4) + phase;
buffer[i] = (1 - (4 * Math.Abs((t % 1) - 0.5) - 1)) - 1;
}
break;
case FunctionWaveform.Square:
case FunctionWaveform.Sawtooth:
phase = NormalizedPhase(phase) / TwoPI;
for (int i = 0; i < buffer.Length; i++)
{
var t = frequency * (i + sampleOffset + period / 2) + phase;
buffer[i] = 2 * (t % 1) - 1;
if (waveform == FunctionWaveform.Square)
{
buffer[i] = Math.Sign(buffer[i]);
}
}
break;
}
}
var result = new Mat(1, buffer.Length, Depth.GetValueOrDefault(OpenCV.Net.Depth.F64), 1);
using (var bufferHeader = Mat.CreateMatHeader(buffer))
{
CV.ConvertScale(bufferHeader, result, Amplitude, Offset);
return(result);
}
}