Method OnPaint

src/widgets/MeterPanel.cpp:438–655

}

void MeterPanel::OnPaint(wxPaintEvent & WXUNUSED(event))
{
#if defined(__WXMAC__)
   auto paintDC = std::make_unique<wxPaintDC>(this);
#else
   std::unique_ptr<wxDC> paintDC{ wxAutoBufferedPaintDCFactory(this) };
#endif
   wxDC & destDC = *paintDC;
   wxColour clrText = theTheme.Colour( clrTrackPanelText );
   wxColour clrBoxFill = theTheme.Colour( clrMedium );

   if (mLayoutValid == false || (mStyle == MixerTrackCluster ))
   {
      // Create a NEW one using current size and select into the DC
      mBitmap = std::make_unique<wxBitmap>();
      mBitmap->Create(mWidth, mHeight, destDC);
      wxMemoryDC dc;
      dc.SelectObject(*mBitmap);

      // Go calculate all of the layout metrics
      HandleLayout(dc);

      mBkgndBrush.SetColour( GetBackgroundColour() );
      dc.SetPen(*wxTRANSPARENT_PEN);
      dc.SetBrush(mBkgndBrush);
      dc.DrawRectangle(0, 0, mWidth, mHeight);

      // MixerTrackCluster style has no icon or L/R labels
      if (mStyle != MixerTrackCluster)
      {
         dc.SetFont(GetFont());
         dc.SetTextForeground( clrText );
         dc.SetTextBackground( clrBoxFill );
         dc.DrawText(mLeftText, mLeftTextPos.x, mLeftTextPos.y);
         dc.DrawText(mRightText, mRightTextPos.x, mRightTextPos.y);
      }

      // Setup the colors for the 3 sections of the meter bars
      wxColor green(117, 215, 112);
      wxColor yellow(255, 255, 0);
      wxColor red(255, 0, 0);

      // Bug #2473 - (Sort of) Hack to make text on meters more
      // visible with darker backgrounds. It would be better to have
      // different colors entirely and as part of the theme.
      if (GetBackgroundColour().GetLuminance() < 0.25)
      {
         green = wxColor(117-100, 215-100, 112-100);
         yellow = wxColor(255-100, 255-100, 0);
         red = wxColor(255-100, 0, 0);
      }
      else if (GetBackgroundColour().GetLuminance() < 0.50)
      {
         green = wxColor(117-50, 215-50, 112-50);
         yellow = wxColor(255-50, 255-50, 0);
         red = wxColor(255-50, 0, 0);
      }