Method DrawPlot

src/FreqWindow.cpp:603–752

}

void FrequencyPlotDialog::DrawPlot()
{
   if (!mData || mDataLen < mWindowSize || mAnalyst->GetProcessedSize() == 0) {
      wxMemoryDC memDC;

      vRuler->ruler.SetUpdater(&LinearUpdater::Instance());
      vRuler->ruler.SetRange(0.0, -dBRange);

      hRuler->ruler.SetUpdater(&LinearUpdater::Instance());
      hRuler->ruler.SetRange(0, 1);

      DrawBackground(memDC);

      if (mDataLen < mWindowSize) {
         wxString msg = _("Not enough data selected.");
         wxSize sz = memDC.GetTextExtent(msg);
         memDC.DrawText(msg,
                        (mPlotRect.GetWidth() - sz.GetWidth()) / 2,
                        (mPlotRect.GetHeight() - sz.GetHeight()) / 2);
      }

      memDC.SelectObject(wxNullBitmap);

      mFreqPlot->Refresh();

      Refresh();

      return;
   }

   float yRange = mYMax - mYMin;
   float yTotal = yRange * ((float) mZoomSlider->GetValue() / 100.0f);

   int sTotal = yTotal * 100;
   int sRange = yRange * 100;
   int sPos = mPanScroller->GetThumbPosition() + ((mPanScroller->GetThumbSize() - sTotal) / 2);
    mPanScroller->SetScrollbar(sPos, sTotal, sRange, sTotal);

   float yMax = mYMax - ((float)sPos / 100);
   float yMin = yMax - yTotal;

   // Set up y axis ruler

   if (mAlg == SpectrumAnalyst::Spectrum) {
      vRuler->ruler.SetUnits(XO("dB"));
      vRuler->ruler.SetFormat(&LinearDBFormat::Instance());
   } else {
      vRuler->ruler.SetUnits({});
      vRuler->ruler.SetFormat(&RealFormat::LinearInstance());
   }
   int w1, w2, h;
   vRuler->ruler.GetMaxSize(&w1, &h);
   vRuler->ruler.SetRange(yMax, yMin); // Note inversion for vertical.
   vRuler->ruler.GetMaxSize(&w2, &h);
   if( w1 != w2 )   // Reduces flicker
   {
      vRuler->SetMinSize(wxSize(w2,h));
      Layout();