text: // --------------------------------------------------------------------------
  //                   OpenMS -- Open-Source Mass Spectrometry
  // --------------------------------------------------------------------------
  // Copyright The OpenMS Team -- Eberhard Karls University Tuebingen,
  // ETH Zurich, and Freie Universitaet Berlin 2002-2018.
  //
  // This software is released under a three-clause BSD license:
  //  * Redistributions of source code must retain the above copyright
  //    notice, this list of conditions and the following disclaimer.
  //  * Redistributions in binary form must reproduce the above copyright
  //    notice, this list of conditions and the following disclaimer in the
  //    documentation and/or other materials provided with the distribution.
  //  * Neither the name of any author or any participating institution
  //    may be used to endorse or promote products derived from this software
  //    without specific prior written permission.
  // For a full list of authors, refer to the file AUTHORS.
  // --------------------------------------------------------------------------
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  // ARE DISCLAIMED. IN NO EVENT SHALL ANY OF THE AUTHORS OR THE CONTRIBUTING
  // INSTITUTIONS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  
  #include <QApplication>
  #include <OpenMS/VISUAL/Spectrum1DWidget.h>
  #include <OpenMS/FORMAT/DTAFile.h>
  #include <OpenMS/KERNEL/StandardTypes.h>
  #include <OpenMS/KERNEL/OnDiscMSExperiment.h>
  #include <OpenMS/VISUAL/LayerData.h>
  
  using namespace OpenMS;
  using namespace std;
  
  Int main(int argc, const char ** argv)
  {
    if (argc < 2) return 1;
    // the path to the data should be given on the command line
    String tutorial_data_path(argv[1]);
    
    QApplication app(argc, const_cast<char **>(argv));
  
    PeakMap exp;
    exp.resize(1);
    DTAFile().load(tutorial_data_path + "/data/Tutorial_Spectrum1D.dta", exp[0]);
    LayerData::ExperimentSharedPtrType exp_sptr(new PeakMap(exp));
    LayerData::ODExperimentSharedPtrType on_disc_exp_sptr(new OnDiscMSExperiment());
    Spectrum1DWidget * widget = new Spectrum1DWidget(Param(), nullptr);
    widget->canvas()->addLayer(exp_sptr, on_disc_exp_sptr);
    widget->show();
  
    return app.exec();
  } //end of main
  