public void DetermineNewFrequencyRange(int x, ref Int64 Low, ref Int64 High, ref int SampleCount)
{
Int64 nCentralFrequency;
Int64 nPreviousBW;
Int64 nNewStartFrequency;
Int64 nNewEndFrequency;
nCentralFrequency = GraphConfig.GetFrequencyFromXDisplay(x);
nPreviousBW = GraphConfig.nLastDrawingHighFrequency - GraphConfig.nLastDrawingLowFrequency;
if (nPreviousBW < 100)
{
return;
}
nNewStartFrequency = nCentralFrequency - (Int64)(nPreviousBW * fZoomInRatio * 0.5f);
nNewEndFrequency = nCentralFrequency + (Int64)(nPreviousBW * fZoomInRatio * 0.5f);
// now we correct the zoom to take acount of discrete frequency step
SampleCount = Owner.GetSampleCount();
Int64 nBW = (nNewEndFrequency - nNewStartFrequency);
Int64 nRealStep;
if (SampleCount > nBW)
{
SampleCount = (int)nBW;
nRealStep = 1;
}
else
{
nRealStep = ((nNewEndFrequency - nNewStartFrequency) + SampleCount / 2) / SampleCount;
}
nNewStartFrequency = nCentralFrequency - nRealStep * SampleCount / 2;
nNewEndFrequency = nNewStartFrequency + nRealStep * SampleCount;
if (nNewEndFrequency > Owner.DeviceInterface.MaxFrequency)
{
nNewEndFrequency = Owner.DeviceInterface.MaxFrequency;
}
if (nNewStartFrequency < Owner.DeviceInterface.MinFrequency)
{
nNewStartFrequency = Owner.DeviceInterface.MinFrequency;
}
Low = nNewStartFrequency;
High = nNewEndFrequency;
}
public void DisplayFrequencyAndLevelOnCorners(int nXMouse)
{
Int64 nFrequency = GraphConfig.GetFrequencyFromXDisplay(nXMouse);
double dBLevel;
String LevelText = null;
if (CurvesList.Count > 0 && ActiveCurve != null && ActiveCurve.Visible == CCurve.YesNo.Yes)
{
dBLevel = Math.Round(ActiveCurve.GeDBLevelFromFrequency(nFrequency), 2);
LevelDisplayLabel.ForeColor = ActiveCurve.Color_;
LevelText = ActiveCurve.Name + " : ";
}
else
{
dBLevel = 0.0f;
LevelDisplayLabel.ForeColor = Color.Black;
LevelText = "Level : ";
}
double ImpedanceNorm = (100.0f / ((float)Math.Pow(10.0f, dBLevel / 20.0f)) - 100.0f) / 1.0f;
FreqDisplayLabel.Text = "Frequency : " + Utility.GetStringWithSeparators(nFrequency, " ") + "Hz";
if (GraphConfig.outputMode == OutputMode.dB)
{
if (ImpedanceNorm >= 0)
{
LevelDisplayLabel.Text = LevelText + dBLevel.ToString() + "dB " + " |Z|=" + Math.Round(ImpedanceNorm, 0) + " Ohms";
}
else
{
LevelDisplayLabel.Text = LevelText + dBLevel.ToString() + "dB ";
}
}
else
{
LevelDisplayLabel.Text = LevelText + dBLevel.ToString();
}
GraphConfig.DrawTopBox(CurvesList, nFrequency);
}
private void SpectrumPictureBoxClass_MouseClick(object sender, MouseEventArgs e)
{
if (Owner.DeviceInterface.GetDevice() == null)
{
return; // no device
}
MouseEventArgs Event = (MouseEventArgs)e;
{
Int64 nCentralFrequency;
Int64 nPreviousBW;
Int64 nNewStartFrequency;
Int64 nNewEndFrequency;
nCentralFrequency = GraphConfig.GetFrequencyFromXDisplay(Event.X);
nPreviousBW = GraphConfig.nLastDrawingHighFrequency - GraphConfig.nLastDrawingLowFrequency;
if (Event.Button == MouseButtons.Left)
{
if (nPreviousBW < 100)
{
return;
}
nNewStartFrequency = nCentralFrequency - (Int64)(nPreviousBW * fZoomInRatio * 0.5f);
nNewEndFrequency = nCentralFrequency + (Int64)(nPreviousBW * fZoomInRatio * 0.5f);
}
else
{
nNewStartFrequency = nCentralFrequency - nPreviousBW;
nNewEndFrequency = nCentralFrequency + nPreviousBW;
}
// now we correct the zoom to take acount of discrete frequency step
int nSampleCount = Owner.GetSampleCount();
Int64 nBW = (nNewEndFrequency - nNewStartFrequency);
Int64 nRealStep;
if (nSampleCount > nBW)
{
nSampleCount = (int)nBW;
Owner.SetSampleCount(nSampleCount);
nRealStep = 1;
}
else
{
nRealStep = ((nNewEndFrequency - nNewStartFrequency) + nSampleCount / 2) / nSampleCount;
}
nNewStartFrequency = nCentralFrequency - nRealStep * nSampleCount / 2;
nNewEndFrequency = nNewStartFrequency + nRealStep * nSampleCount;
if (nNewEndFrequency > Owner.DeviceInterface.MaxFrequency)
{
nNewEndFrequency = Owner.DeviceInterface.MaxFrequency;
}
if (nNewStartFrequency < Owner.DeviceInterface.MinFrequency)
{
nNewStartFrequency = Owner.DeviceInterface.MinFrequency;
}
GraphConfig.nLastDrawingLowFrequency = nNewStartFrequency;
GraphConfig.nLastDrawingHighFrequency = nNewEndFrequency;
DrawCurveCollection(CurvesList);
Owner.SetSweepStartFrequency(nNewStartFrequency);
Owner.SetSweepEndFrequency(nNewEndFrequency);
}
}