Function FrequencyToPosition

src/tracks/ui/BrushHandle.cpp:65–76

Converts a frequency to screen y position.

{
   /// Converts a frequency to screen y position.
   wxInt64 FrequencyToPosition(const WaveChannel &wc,
                               double frequency,
                               wxInt64 trackTopEdge,
                               int trackHeight)
   {
      const auto &settings = SpectrogramSettings::Get(wc);
      float minFreq, maxFreq;
      SpectrogramBounds::Get(wc).GetBounds(wc, minFreq, maxFreq);
      const NumberScale numberScale(settings.GetScale(minFreq, maxFreq));
      const float p = numberScale.ValueToPosition(frequency);
      return trackTopEdge + wxInt64((1.0 - p) * trackHeight);
   }

   /// Converts a position (mouse Y coordinate) to
   /// frequency, in Hz.