Method paintGridLines_

src/openms_gui/source/VISUAL/PlotCanvas.cpp:315–392

  }

  void PlotCanvas::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 (std::vector<double>::const_iterator it = spectrum_widget_->xAxis()->gridLines()[j].begin(); it != spectrum_widget_->xAxis()->gridLines()[j].end(); ++it)
      {
        int x = static_cast<int>(Math::intervalTransformation(*it, 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;