Method DoDrawOverlap

src/AdornedRulerPanel.cpp:2572–2579

constexpr double SelectionOpacity = 0.4;

void AdornedRulerPanel::DoDrawOverlap(wxDC * dc, const wxRect &rect)
{
   dc->SetBrush( wxBrush{ AlphaBlend(
      TimelineSelectionColor(), TimelineLoopRegionColor(mLastPlayRegionActive),
      SelectionOpacity) } );
   dc->SetPen( *wxTRANSPARENT_PEN );
   dc->DrawRectangle( rect );
}

void AdornedRulerPanel::DoDrawSelection(
   wxDC * dc, const wxRect &rectS, const wxRect &rectL, const wxRect &rectR)