Method paint

src/openms_gui/source/VISUAL/Plot1DCanvas.cpp:618–717

  }

  void Plot1DCanvas::paint(QPainter* painter, QPaintEvent* e)
  {
    QElapsedTimer timer;
    timer.start();

    // clear
    painter->fillRect(0, 0, this->width(), this->height(),
                      QColor(String(param_.getValue("background_color").toString()).toQString()));

    // we are done if no layer is present
    if (getLayerCount() == 0)
    {
      e->accept();
      return;
    }

    // gridlines
    paintGridLines_(*painter);

    // paint each layer
    for (Size i = 0; i < getLayerCount(); ++i)
    {
      recalculatePercentageFactor_(i);
      auto paint_1d = getLayer(i).getPainter1D();
      paint_1d->paint(painter, this, (int)i);      
    }

    if (show_alignment_)
    {
      drawAlignment_(*painter);
    }

    if (mirror_mode_)
    {
      painter->save();

      if (!show_alignment_)
      {
        // draw x-axis
        painter->setPen(Qt::black);
        painter->drawLine(0, height() / 2, width(), height() / 2);
      }
      else
      {
        // two x-axes:
        painter->setPen(Qt::black);
        painter->drawLine(0, height() / 2 + 5, width(), height() / 2 + 5);
        painter->drawLine(0, height() / 2 - 5, width(), height() / 2 - 5);
      }
      painter->restore();
    }


    // draw measuring line when in measure mode and valid measurement start peak selected
    if (action_mode_ == AM_MEASURE && measurement_start_.isValid())
    {
      // use start-point + mouse position of non-gravity axis
      QPoint measurement_end_point_px = gr_.swap().gravitateTo(measurement_start_point_px_, last_mouse_pos_);