examples/RealTime/main.cpp

0001 /**
0002  * Copyright (C) 2001-2015 Klaralvdalens Datakonsult AB.  All rights reserved.
0003  *
0004  * This file is part of the KD Chart library.
0005  *
0006  * This program is free software; you can redistribute it and/or
0007  * modify it under the terms of the GNU General Public License as
0008  * published by the Free Software Foundation; either version 2 of
0009  * the License, or (at your option) any later version.
0010  *
0011  * This program is distributed in the hope that it will be useful,
0012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
0013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
0014  * GNU General Public License for more details.
0015  *
0016  * You should have received a copy of the GNU General Public License
0017  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
0018  */
0019
0020 #include <QStandardItemModel>
0021 #include <QTimer>
0022 #include <KChartChart>
0023 #include <KChartBarDiagram>
0024
0025 #include <QApplication>
0026
0027
0028 class ChartWidget : public QWidget {
0029   Q_OBJECT
0030 public:
0031   explicit ChartWidget(QWidget* parent = nullptr)
0032     : QWidget(parent)
0033   {
0034
0035     m_model.insertRows( 0, 2, QModelIndex() );
0036     m_model.insertColumns(  0,  3,  QModelIndex() );
0037     for (int row = 0; row < 3; ++row) {
0038             for (int column = 0; column < 3; ++column) {
0039                 QModelIndex index = m_model.index(row, column, QModelIndex());
0040                 m_model.setData(index, QVariant(row+1 * column) );
0041             }
0042     }
0043
0044     KChart::BarDiagram* diagram = new KChart::BarDiagram;
0045     diagram->setModel(&m_model);
0046
0047     m_chart.coordinatePlane()->replaceDiagram(diagram);
0048
0049     QVBoxLayout* l = new QVBoxLayout(this);
0050     l->addWidget(&m_chart);
0051     setLayout(l);
0052     m_timer = new QTimer(this);
0053     connect( m_timer, SIGNAL(timeout()),
0054              this, SLOT(slotTimeout()) );
0055     m_timer->start( 200 );
0056   }
0057
0058 private Q_SLOTS:
0059       void slotTimeout() {
0060           QModelIndex index = m_model.index( 0, 1, QModelIndex());
0061           qreal value = ( m_model.data( index ).toInt() % 24 ) +1;
0062           m_model.setData( index, value );
0063       }
0064
0065 private:
0066   KChart::Chart m_chart;
0067   QStandardItemModel m_model;
0068   QTimer *m_timer;
0069 };
0070
0071 int main( int argc, char** argv ) {
0072     QApplication app( argc, argv );
0073
0074     ChartWidget w;
0075     w.show();
0076
0077     return app.exec();
0078 }
0079
0080 #include "main.moc"