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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:FDL$
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-** accordance with the commercial license agreement provided with the
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-** and conditions see https://www.qt.io/terms-conditions. For further
-** information use the contact form at https://www.qt.io/contact-us.
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-** GNU Free Documentation License Usage
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-** Documentation License version 1.3 as published by the Free Software
-** Foundation and appearing in the file included in the packaging of
-** this file. Please review the following information to ensure
-** the GNU Free Documentation License version 1.3 requirements
-** will be met: https://www.gnu.org/licenses/fdl-1.3.html.
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-****************************************************************************/
-
-/*!
-    \example qmlspectrogram
-    \title Qt Quick 2 Spectrogram Example
-    \ingroup qtdatavisualization_examples
-    \brief Showing spectrogram graph in a QML application.
-
-    The Qt Quick 2 Spectrogram example demonstrates how to show a polar and cartesian spectrograms
-    and how to utilize orthographic projection to show them in 2D.
-
-    \image qmlspectrogram-example.png
-
-    Spectrogram is simply a surface graph with a range gradient used to emphasize the different
-    values. Typically spectrograms are shown with two dimensional surfaces, which we simulate
-    with a top down orthographic view of the graph. To enforce the 2D effect, we disable the
-    graph rotation via mouse or touch when in the orthographic mode.
-
-    The focus in this example is on showing how to display spectrograms, so the basic
-    functionality is not explained. For more detailed QML example documentation,
-    see \l{Qt Quick 2 Scatter Example}.
-
-    \include examples-run.qdocinc
-
-    \section1 Creating a Spectrogram
-
-    To create a 2D spectrogram, we define a Surface3D item:
-
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 0
-
-    The key properties for enabling the 2D effect are
-    \l{AbstractGraph3D::orthoProjection}{orthoProjection} and
-    \l{Camera3D::cameraPreset}{scene.activeCamera.cameraPreset}. We remove the perspective by
-    enabling orthographic projection for the graph, and then we eliminate the Y-dimension by
-    viewing the graph directly from above:
-
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 1
-
-    Since this viewpoint causes the horizontal axis grid to be mostly obscured by the surface,
-    we also specify that the horizontal grid should be drawn on top of the graph:
-
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 2
-
-    \section1 Polar Spectrogram
-
-    Depending on the data, it is sometimes more natural to use a polar graph instead of a cartesian
-    one. Qt Data Visualization supports this via \l{AbstractGraph3D::polar}{polar} property.
-    In this example we provide a button to switch between polar and cartesian modes:
-
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 3
-
-    In the polar mode, the X-axis is converted into the angular polar axis, and the Z-axis is
-    converted into the radial polar axis. The surface points are recalculated according to new axes.
-
-    The radial axis labels are drawn outside the graph by default, but in this example we want to
-    draw them right next to the 0 degree angular axis inside the graph, so we define only a tiny
-    offset for them:
-
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 4
-
-    To enforce the 2D effect, graph rotation via user input is disabled when in orthographic mode.
-    We do this by specifying a new input handler:
-
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 5
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 7
-    \dots 0
-    \snippet qmlspectrogram/qml/qmlspectrogram/main.qml 6
-    \dots 0
-
-    When the projection mode changes, we adjust the value of the
-    \l{InputHandler3D::rotationEnabled}{rotationEnabled} property of the \c{customInputHandler}
-    to control the rotation.
-
-    \section1 Example Contents
-*/