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diff --git a/examples/datavisualization/surface/surfacegraph.h b/examples/datavisualization/surface/surfacegraph.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the QtDataVisualization module.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+#ifndef SURFACEGRAPH_H
+#define SURFACEGRAPH_H
+
+#include <QtDataVisualization/Q3DSurface>
+#include <QtDataVisualization/QSurfaceDataProxy>
+#include <QtDataVisualization/QHeightMapSurfaceDataProxy>
+#include <QtDataVisualization/QSurface3DSeries>
+#include <QtWidgets/QSlider>
+
+using namespace QtDataVisualization;
+
+class SurfaceGraph : public QObject
+{
+    Q_OBJECT
+public:
+    explicit SurfaceGraph(Q3DSurface *surface);
+    ~SurfaceGraph();
+
+    void enableHeightMapModel(bool enable);
+    void enableSqrtSinModel(bool enable);
+
+    //! [0]
+    void toggleModeNone() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionNone); }
+    void toggleModeItem() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionItem); }
+    void toggleModeSliceRow() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemAndRow
+                                                          | QAbstract3DGraph::SelectionSlice); }
+    void toggleModeSliceColumn() { m_graph->setSelectionMode(QAbstract3DGraph::SelectionItemAndColumn
+                                                             | QAbstract3DGraph::SelectionSlice); }
+    //! [0]
+
+    void setBlackToYellowGradient();
+    void setGreenToRedGradient();
+
+    void setAxisMinSliderX(QSlider *slider) { m_axisMinSliderX = slider; }
+    void setAxisMaxSliderX(QSlider *slider) { m_axisMaxSliderX = slider; }
+    void setAxisMinSliderZ(QSlider *slider) { m_axisMinSliderZ = slider; }
+    void setAxisMaxSliderZ(QSlider *slider) { m_axisMaxSliderZ = slider; }
+
+    void adjustXMin(int min);
+    void adjustXMax(int max);
+    void adjustZMin(int min);
+    void adjustZMax(int max);
+
+public slots:
+    void changeTheme(int theme);
+
+private:
+    Q3DSurface *m_graph;
+    QHeightMapSurfaceDataProxy *m_heightMapProxy;
+    QSurfaceDataProxy *m_sqrtSinProxy;
+    QSurface3DSeries *m_heightMapSeries;
+    QSurface3DSeries *m_sqrtSinSeries;
+
+    QSlider *m_axisMinSliderX;
+    QSlider *m_axisMaxSliderX;
+    QSlider *m_axisMinSliderZ;
+    QSlider *m_axisMaxSliderZ;
+    float m_rangeMinX;
+    float m_rangeMinZ;
+    float m_stepX;
+    float m_stepZ;
+    int m_heightMapWidth;
+    int m_heightMapHeight;
+
+    void setAxisXRange(float min, float max);
+    void setAxisZRange(float min, float max);
+    void fillSqrtSinProxy();
+};
+
+#endif // SURFACEGRAPH_H