Method PaintMeter

src/effects/CompressionMeterPanel.cpp:134–179

}

void CompressionMeterPanel::PaintMeter(
   wxPaintDC& dc, const wxColor& color, const wxRect& rect,
   const MeterValueProvider& provider)
{
   const auto dB = provider.GetCurrentMax();
   const auto maxDb = provider.GetGlobalMax();
   const auto fiveSecMaxDb = provider.GetFiveSecMax();
   const auto downwards =
      provider.GetDirection() == MeterValueProvider::Direction::Downwards;

   const auto gc = MakeGraphicsContext(dc);

   const double left = rect.GetLeft();
   const double top = rect.GetTop();
   const double width = rect.GetWidth();
   const double height = rect.GetHeight();

   constexpr auto lineWidth = 6.;

   const double dbFrac = std::clamp<double>(dB / mDbBottomEdgeValue, 0., 1.);
   // So that the top of the cap is aligned with the dB value.
   const auto yAdjust = lineWidth / 2 * (downwards ? -1 : 1);
   const double dbY = height * dbFrac + yAdjust;
   const double maxDbY = maxDb / mDbBottomEdgeValue * height + yAdjust;
   const double fiveSecMaxDbY =
      fiveSecMaxDb / mDbBottomEdgeValue * height + yAdjust;

   const auto levelTop = downwards ? top : dbY;
   const auto levelHeight = downwards ? dbY : height - dbY;
   const auto maxLevelTop = downwards ? levelHeight - top : maxDbY;
   const auto maxLevelHeight = std::abs(maxDbY - dbY);

   const auto rectLeft = left + 3;
   const auto rectWidth = width - 4;
   const auto opaqueColor = wxColor { color.GetRGB() };
   gc->SetBrush(GetColorMix(opaqueColor, wxTransparentColor, 0.8));
   gc->DrawRectangle(rectLeft, levelTop, rectWidth, levelHeight);
   gc->SetBrush(GetColorMix(opaqueColor, wxTransparentColor, 0.6));
   gc->DrawRectangle(rectLeft, maxLevelTop, rectWidth, maxLevelHeight);
   gc->SetBrush(opaqueColor);
   gc->DrawRectangle(rectLeft, dbY - 2, rectWidth, lineWidth);
   gc->DrawRectangle(rectLeft, maxDbY - 2, rectWidth, lineWidth);
   gc->SetPen({ opaqueColor, static_cast<int>(lineWidth / 2) });
   gc->StrokeLine(
      left + rectWidth / 2, fiveSecMaxDbY, left + rectWidth, fiveSecMaxDbY);
}

void CompressionMeterPanel::OnTimer(wxTimerEvent& evt)
{