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diff --git a/tests/manual/galaxy/cumulativedistributor.h b/tests/manual/galaxy/cumulativedistributor.h
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+/******************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Data Visualization module.
+**
+** $QT_BEGIN_LICENSE:COMM$
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** $QT_END_LICENSE$
+**
+******************************************************************************/
+
+/*
+ * Galaxy creation code obtained from http://beltoforion.de/galaxy/galaxy_en.html
+ * Thanks to Ingo Berg, great work.
+ * Licensed under a  Creative Commons Attribution 3.0 License
+ * http://creativecommons.org/licenses/by/3.0/
+ */
+
+#ifndef CUMULATIVEDISTRIBUTOR_H
+#define CUMULATIVEDISTRIBUTOR_H
+
+#include <QtCore/qglobal.h>
+#include <QtGui/QVector2D>
+#include <QtCore/QVector>
+
+class CumulativeDistributor
+{
+public:
+    typedef qreal (CumulativeDistributor::*dist_fun_t)(qreal x);
+
+    CumulativeDistributor();
+    virtual ~CumulativeDistributor();
+
+    qreal PropFromVal(qreal fVal);
+    qreal ValFromProp(qreal fVal);
+
+    void setupRealistic(qreal I0, qreal k, qreal a, qreal RBulge, qreal min,
+                        qreal max, int nSteps);
+    qreal valFromProp(qreal fVal);
+
+private:
+    dist_fun_t m_pDistFun;
+    qreal m_fMin;
+    qreal m_fMax;
+    qreal m_fWidth;
+    int m_nSteps;
+
+    // parameters for realistic star distribution
+    qreal m_I0;
+    qreal m_k;
+    qreal m_a;
+    qreal m_RBulge;
+
+    QVector<qreal> m_vM1;
+    QVector<qreal> m_vY1;
+    QVector<qreal> m_vX1;
+
+    QVector<qreal> m_vM2;
+    QVector<qreal> m_vY2;
+    QVector<qreal> m_vX2;
+
+    void buildCDF(int nSteps);
+
+    qreal IntensityBulge(qreal R, qreal I0, qreal k);
+    qreal IntensityDisc(qreal R, qreal I0, qreal a);
+    qreal Intensity(qreal x);
+};
+
+#endif // CUMULATIVEDISTRIBUTOR_H