private void UpdateFrequency(long f, FrequencyChangeSource source)
{
var min = (long)(_displayCenterFrequency - _spectrumWidth / _scale / 2);
if (f < min)
{
f = min;
}
var max = (long)(_displayCenterFrequency + _spectrumWidth / _scale / 2);
if (f > max)
{
f = max;
}
if (_useSnap)
{
f = (f + Math.Sign(f) * _stepSize / 2) / _stepSize * _stepSize;
}
if (f != _frequency)
{
var args = new FrequencyEventArgs(f, source);
OnFrequencyChanged(args);
if (!args.Cancel)
{
_frequency = args.Frequency;
_performNeeded = true;
}
}
}
private void UpdateCenterFrequency(long f, FrequencyChangeSource source)
{
if (f < 0)
{
f = 0;
}
if (_useSnap)
{
f = (f + Math.Sign(f) * _stepSize / 2) / _stepSize * _stepSize;
}
if (f != _centerFrequency)
{
var args = new FrequencyEventArgs(f, source);
OnCenterFrequencyChanged(args);
if (!args.Cancel)
{
var delta = args.Frequency - _centerFrequency;
_displayCenterFrequency += delta;
_centerFrequency = args.Frequency;
_drawBackgroundNeeded = true;
}
}
}
protected virtual void OnCenterFrequencyChanged(FrequencyEventArgs e)
{
if (CenterFrequencyChanged != null)
{
CenterFrequencyChanged(this, e);
}
}