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diff --git a/src/datavis3d/data/barrenderitem_p.h b/src/datavis3d/data/barrenderitem_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 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 QtDataVis3D 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
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtDataVis3D API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#ifndef BARRENDERITEM_P_H
+#define BARRENDERITEM_P_H
+
+#include "abstractrenderitem_p.h"
+
+QT_DATAVIS3D_BEGIN_NAMESPACE
+
+class Bars3dRenderer;
+
+class BarRenderItem : public AbstractRenderItem
+{
+public:
+    BarRenderItem();
+    virtual ~BarRenderItem();
+
+    // Position relative to data window (for bar label generation)
+    inline void setPosition(const QPoint &pos) { m_position = pos; }
+    inline const QPoint &position() const { return m_position; }
+
+    // Actual cached data value of the bar (needed to trigger label reformats)
+    inline void setValue(qreal value);
+    inline qreal value() const { return m_value; }
+
+    // Normalized bar height
+    inline void setHeight(GLfloat height) { m_height = height; }
+    inline GLfloat height() const { return m_height; }
+
+    // TODO should be in abstract, but currently there is no abstract renderer
+    inline void setRenderer(Bars3dRenderer *renderer) { m_renderer = renderer; }
+
+protected:
+    virtual void formatLabel();
+
+    Bars3dRenderer *m_renderer;
+    qreal m_value;
+    QPoint m_position; // x = row, y = column
+    GLfloat m_height;
+
+    friend class QBarDataItem;
+};
+
+void BarRenderItem::setValue(qreal value)
+{
+    if (m_value != value) {
+        m_value = value;
+        if (!m_label.isNull())
+            setLabel(QString()); // Forces reformatting on next access
+    }
+}
+
+typedef QVector<BarRenderItem> BarRenderItemRow;
+typedef QVector<BarRenderItemRow> BarRenderItemArray;
+
+QT_DATAVIS3D_END_NAMESPACE
+
+#endif