public void OnUpdateSpectrumPointData(long pFreqIndex, SpectrumPointData pPointData)
{
Action <long, SpectrumPointData> handler = UpdateSpectrumPointData;
if (handler != null)
{
handler(pFreqIndex, pPointData);
}
}
/// <summary>
/// 获取频率范围内最小谱图点数据
/// </summary>
/// <param name="pStartFreq">起始频率</param>
/// <param name="pStopFreq">终止频率</param>
/// <returns>谱图点数据</returns>
public SpectrumPointData?GetMinSpectrumPointData(double pStartFreq, double pStopFreq)
{
long sIndex = GetIndex(pStartFreq) + 1;
long eIndex = GetIndex(pStopFreq) - 1;
long count = eIndex - sIndex;
if (count <= 0)
{
return(null);
}
var sp = new SpectrumPointData();
lock (_lockObj)
{
double minDubv = 0;
for (long i = sIndex; i < eIndex; i++)
{
long offset = i * _dataStructSize;
if (offset > _stream.Length)
{
return(null);
}
_stream.Seek(offset, SeekOrigin.Begin);
_stream.Read(_buffer, 0, _dataStructSize);
double freqV = BitConverter.ToDouble(_buffer, 0);
short dbuv = BitConverter.ToInt16(_buffer, 8);
if (dbuv < minDubv)
{
minDubv = dbuv;
sp.Dbuv = dbuv;
sp.Freq = freqV;
}
}
}
return(sp);
}