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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the examples of QtDataVis3D.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
+**     of its contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef FREQUENCYSPECTRUM_H
+#define FREQUENCYSPECTRUM_H
+
+#include <QtCore/QVector>
+
+/**
+ * Represents a frequency spectrum as a series of elements, each of which
+ * consists of a frequency, an amplitude and a phase.
+ */
+class FrequencySpectrum {
+public:
+    FrequencySpectrum(int numPoints = 0);
+
+    struct Element {
+        Element()
+        :   frequency(0.0), amplitude(0.0), phase(0.0), clipped(false)
+        { }
+
+        /**
+         * Frequency in Hertz
+         */
+        qreal frequency;
+
+        /**
+         * Amplitude in range [0.0, 1.0]
+         */
+        qreal amplitude;
+
+        /**
+         * Phase in range [0.0, 2*PI]
+         */
+        qreal phase;
+
+        /**
+         * Indicates whether value has been clipped during spectrum analysis
+         */
+        bool clipped;
+    };
+
+    typedef QVector<Element>::iterator iterator;
+    typedef QVector<Element>::const_iterator const_iterator;
+
+    void reset();
+
+    int count() const;
+    Element& operator[](int index);
+    const Element& operator[](int index) const;
+    iterator begin();
+    iterator end();
+    const_iterator begin() const;
+    const_iterator end() const;
+
+private:
+    QVector<Element> m_elements;
+
+};
+
+#endif // FREQUENCYSPECTRUM_H