Method exportAsImage

src/openms_gui/source/VISUAL/APPLICATIONS/TOPPASBase.cpp:684–744

  }

  void TOPPASBase::exportAsImage()
  {
    TOPPASWidget* w = activeSubWindow_();
    TOPPASScene* s = w->getScene();

    QString cp = current_path_.toQString();
    QString file_name = QFileDialog::getSaveFileName(w, tr("Save image"), cp, tr("Images (*.svg *.png *.jpg)"));
    if (file_name == "")
    {
      return;
    }
    if (!file_name.endsWith(".svg", Qt::CaseInsensitive) &&
        !file_name.endsWith(".png", Qt::CaseInsensitive) &&
        !file_name.endsWith(".jpg", Qt::CaseInsensitive))
    {
      file_name += ".svg";
    }
    bool svg = file_name.endsWith(".svg");

    QRectF items_bounding_rect = s->itemsBoundingRect();
    qreal wh_proportion = (qreal)(items_bounding_rect.width()) / (qreal)(items_bounding_rect.height());
    bool w_larger_than_h = wh_proportion > 1;
    qreal x1 = 0;
    qreal y1 = 0;
    qreal x2, y2;

    qreal small_edge_length = svg ? 500 : 4000;

    if (w_larger_than_h)
    {
      x2 = wh_proportion * small_edge_length;
      y2 = small_edge_length;
    }
    else
    {
      x2 = small_edge_length;
      y2 = (1.0 / wh_proportion) * small_edge_length;
    }
    qreal width = x2 - x1;
    qreal height = y2 - y1;

    if (svg)
    {
      QSvgGenerator svg_gen;
      svg_gen.setFileName(file_name);
      svg_gen.setSize(QSize(width, height));
      svg_gen.setViewBox(QRect(x1, y1, x2, y2));
      svg_gen.setTitle(tr("Title (TBD)"));
      svg_gen.setDescription(tr("Description (TBD)"));
      QPainter painter(&svg_gen);
      s->render(&painter, QRectF(), items_bounding_rect);
    }
    else
    {
      QImage img(width, height, QImage::Format_RGB32);
      img.fill(QColor(Qt::white).rgb());
      QPainter painter(&img);
      s->render(&painter, QRectF(), items_bounding_rect);