/// <summary>
/// creates a cascade of MinMax filters
/// </summary>
/// <param name="_zoomLevels">dividers by which to divide the initial samples by</param>
/// <param name="initialSize">number of samples before dividing</param>
/// <returns></returns>
public static IMinMaxCache[] CreateCascade(int[] _zoomLevels, long initialSize)
{
var cascade = new IMinMaxCache[_zoomLevels.Length];
cascade = new IMinMaxCache[_zoomLevels.Length];
cascade[0] = new MinMaxCacheFirstStage(_zoomLevels[0], (int)(initialSize / _zoomLevels[0]));
for (int i = 1; i < _zoomLevels.Length; i++)
{
cascade[i] = new MinMaxCache(_zoomLevels[i], _zoomLevels[i - 1], (int)(initialSize / _zoomLevels[i]));
cascade[i - 1].NextMinMaxCache = cascade[i];
}
return(cascade);
}
private void ReadFile()
{
_minMax = MinMaxCache.CreateCascade(_zoomLevels, _reader.SampleCount);
_minMaxFst = (MinMaxCacheFirstStage)_minMax[0];
double[] buffer = new double[1000];
float[] toFloat = new float[buffer.Length];
var read = 0L;
while ((read = _reader.ReadSamples(buffer, 0, buffer.Length)) > 0)
{
for (int i = 0; i < read; i++)
{
toFloat[i] = (float)buffer[i];
}
_minMaxFst.ConsumeSamples(toFloat, 0, (int)read);
}
_reader.Seek(0, System.IO.SeekOrigin.Begin);
}
/// <summary>
/// Continuous-time stream of data
/// </summary>
/// <param name="size">number of samples the buffer can hold</param>
public DataLine1D(string name, int size, int samplerate)
{
_zoomLevels = new[] {
1 << 6,
1 << 7,
1 << 8,
1 << 9,
1 << 10,
1 << 11,
1 << 12,
1 << 13,
1 << 14,
1 << 15,
1 << 16
};
_ringBuffer = new VertexRingBuffer(size);
_ringBufferMax = new VertexRingBuffer(size);
_ringBufferMin = new VertexRingBuffer(size);
_floatTemp = new float[size];
_minMaxTemp = new MinMax[size];
Name = name;
SamplesPerSecond = samplerate;
_signalBuffer = new GenericRingBuffer <float>(size)
{
FixedSize = true
};
_minMax = MinMaxCache.CreateCascade(_zoomLevels, size);
_minMaxFst = (MinMaxCacheFirstStage)_minMax[0];
// init as -2 because -1 is for fully zoomed in and 0-.. is for other zoom levels.
// -2 so that in Render() a level change occurs
_level = -2;
}