Method paintEvent

src/openms_gui/source/VISUAL/Plot2DCanvas.cpp:430–573

  }

  void Plot2DCanvas::paintEvent(QPaintEvent * e)
  {
    //Only fill background if no layer is present
    if (getLayerCount() == 0)
    {
      QPainter painter;
      painter.begin(this);
      painter.fillRect(0, 0, this->width(), this->height(), QColor(String(param_.getValue("background_color").toString()).toQString()));
      painter.end();
      e->accept();
      return;
    }

#ifdef DEBUG_TOPPVIEW
    cout << "BEGIN " << OPENMS_PRETTY_FUNCTION << endl;
    cout << "  Visible area -- m/z: " << visible_area_.minX() << " - " << visible_area_.maxX() << " rt: " << visible_area_.minY() << " - " << visible_area_.maxY() << endl;
    cout << "  Overall area -- m/z: " << overall_data_range_.minPosition()[0] << " - " << overall_data_range_.maxPosition()[0] << " rt: " << overall_data_range_.minPosition()[1] << " - " << overall_data_range_.maxPosition()[1] << endl;
#endif

    //timing
    QElapsedTimer overall_timer;
    if (show_timing_)
    {
      overall_timer.start();
      if (update_buffer_)
      {
        cout << "Updating buffer:" << endl;
      }
      else
      {
        cout << "Copying buffer:" << endl;
      }
    }

    QPainter painter;
    if (update_buffer_)
    {
      update_buffer_ = false;

      // recalculate snap factor
      recalculateSnapFactor_();

      buffer_.fill(QColor(String(param_.getValue("background_color").toString()).toQString()).rgb());
      painter.begin(&buffer_);
      QElapsedTimer layer_timer;

      for (Size i = 0; i < getLayerCount(); i++)
      {
        // timing
        if (show_timing_)
        {
          layer_timer.start();
        }
        if (getLayer(i).visible)
        {
          // update factors (snap and percentage)
          percentage_factor_ = 1.0;
          if (intensity_mode_ == IM_PERCENTAGE)