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diff --git a/examples/charts/openglseries/datasource.h b/examples/charts/openglseries/datasource.h
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+++ b/examples/charts/openglseries/datasource.h
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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd
+** All rights reserved.
+** For any questions to The Qt Company, please use contact form at http://qt.io
+**
+** This file is part of the Qt Charts module.
+**
+** Licensees holding valid commercial license for Qt may use this file in
+** accordance with the Qt License Agreement provided with the Software
+** or, alternatively, in accordance with the terms contained in a written
+** agreement between you and The Qt Company.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.io
+**
+****************************************************************************/
+
+#ifndef DATASOURCE_H
+#define DATASOURCE_H
+
+#include <QtCore/QObject>
+#include <QtCharts/QXYSeries>
+#include <QtWidgets/QLabel>
+#include <QtCore/QElapsedTimer>
+#include <QtCore/QTimer>
+
+QT_CHARTS_USE_NAMESPACE
+
+class DataSource : public QObject
+{
+    Q_OBJECT
+public:
+    explicit DataSource(QObject *parent = 0);
+
+    void startUpdates(const QList<QXYSeries *> &seriesList, QLabel *fpsLabel);
+
+public slots:
+    void generateData(int seriesCount, int rowCount, int colCount);
+    void update(QAbstractSeries *series, int seriesIndex);
+    void handleSceneChanged();
+    void updateAllSeries();
+
+private:
+    QVector<QVector<QVector<QPointF> > > m_data;
+    int m_index;
+    QList<QXYSeries *> m_seriesList;
+    QLabel *m_fpsLabel;
+    QElapsedTimer m_fpsTimer;
+    QTimer m_dataUpdater;
+};
+
+#endif // DATASOURCE_H