Method paintGridLines_

src/openms_gui/source/VISUAL/Plot1DCanvas.cpp:1257–1354

  }

  void Plot1DCanvas::paintGridLines_(QPainter& painter)
  {
    if (!show_grid_ || !spectrum_widget_)
    {
      return;
    }
    QPen p1(QColor(130, 130, 130));
    p1.setStyle(Qt::DashLine);
    QPen p2(QColor(170, 170, 170));
    p2.setStyle(Qt::DotLine);

    painter.save();

    unsigned int xl, xh, yl, yh;     //width/height of the diagram area, x, y coordinates of lo/hi x,y values

    xl = 0;
    xh = width();

    yl = height();
    yh = 0;

    // drawing of grid lines and associated text
    for (Size j = 0; j != spectrum_widget_->xAxis()->gridLines().size(); j++)
    {
      // style definitions
      switch (j)
      {
      case 0:           // style settings for big intervals
        painter.setPen(p1);
        break;

      case 1:           // style settings for small intervals
        painter.setPen(p2);
        break;

      default:
        std::cout << "empty vertical grid line vector error!" << std::endl;
        painter.setPen(QPen(QColor(0, 0, 0)));
        break;
      }

      for (const auto& line : spectrum_widget_->xAxis()->gridLines()[j])
      {
        int x = static_cast<int>(Math::intervalTransformation(line, spectrum_widget_->xAxis()->getAxisMinimum(), spectrum_widget_->xAxis()->getAxisMaximum(), xl, xh));
        painter.drawLine(x, yl, x, yh);
      }
    }

    for (Size j = 0; j != spectrum_widget_->yAxis()->gridLines().size(); j++)
    {

      // style definitions
      switch (j)
      {
      case 0:           // style settings for big intervals
        painter.setPen(p1);
        break;