/**
 * Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB.  All rights reserved.
 *
 * This file is part of the KD Chart library.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

#include <QStandardItemModel>
#include <QTimer>
#include <KChartChart>
#include <KChartBarDiagram>

#include <QApplication>


class ChartWidget : public QWidget {
  Q_OBJECT
public:
  explicit ChartWidget(QWidget* parent = nullptr)
    : QWidget(parent)
  {

    m_model.insertRows( 0, 2, QModelIndex() );
    m_model.insertColumns(  0,  3,  QModelIndex() );
    for (int row = 0; row < 3; ++row) {
            for (int column = 0; column < 3; ++column) {
                QModelIndex index = m_model.index(row, column, QModelIndex());
                m_model.setData(index, QVariant(row+1 * column) );
            }
    }

    KChart::BarDiagram* diagram = new KChart::BarDiagram;
    diagram->setModel(&m_model);

    m_chart.coordinatePlane()->replaceDiagram(diagram);

    QVBoxLayout* l = new QVBoxLayout(this);
    l->addWidget(&m_chart);
    setLayout(l);
    m_timer = new QTimer(this);
    connect( m_timer, SIGNAL(timeout()),
             this, SLOT(slotTimeout()) );
    m_timer->start( 200 );
  }

private Q_SLOTS:
      void slotTimeout() {
          QModelIndex index = m_model.index( 0, 1, QModelIndex());
          qreal value = ( m_model.data( index ).toInt() % 24 ) +1;
          m_model.setData( index, value );
      }

private:
  KChart::Chart m_chart;
  QStandardItemModel m_model;
  QTimer *m_timer;
};

int main( int argc, char** argv ) {
    QApplication app( argc, argv );

    ChartWidget w;
    w.show();

    return app.exec();
}

#include "main.moc"
