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-/****************************************************************************
-**
-** Copyright (C) 2016 The Qt Company Ltd.
-** Contact: https://www.qt.io/licensing/
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-**
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-** accordance with the commercial license agreement provided with the
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-** GNU Free Documentation License Usage
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-** this file. Please review the following information to ensure
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-****************************************************************************/
-
-/*!
-    \example draggableaxes
-    \title Axis Range Dragging With Labels Example
-    \ingroup qtdatavisualization_examples
-    \brief Implementing a custom input handler to support axis dragging.
-    \since QtDataVisualization 1.1
-
-    The Axis Range Dragging example shows how to customize the 3D graph controls in a widget
-    application to allow changing axis ranges by clicking on an axis label and dragging. This is
-    done by implementing a custom input handler to react to selection signals emitted from the
-    graph.
-
-    \image draggableaxes-example.png
-
-    \include examples-run.qdocinc
-
-    \section1 Replacing Default Input Handling
-
-    The default input handling mechanism is replaced by setting the active input handler of
-    Q3DScatter to \c AxesInputHandler that implements the custom behavior:
-
-    \snippet draggableaxes/data.cpp 0
-
-    \c m_inputHandler was initialized in the constructor:
-
-    \snippet draggableaxes/data.cpp 1
-
-    We will also need the pointers to the axes, so we will pass them to our input handler too:
-
-    \snippet draggableaxes/data.cpp 2
-
-    \section1 Extending Mouse Event Handling
-
-    First of all, we inherited our input handler from Q3DInputHandler instead of
-    QAbstract3DInputHandler. The reason for doing this is to keep all the functionality of the
-    default input handling, and to add our own functionality on top of it:
-
-    \snippet draggableaxes/axesinputhandler.h 0
-
-    We start extending the default functionality by re-implementing some of the mouse events.
-    Let's start with \c {mousePressEvent}. We'll just add button pressed flag for left mouse button
-    into it, and keep the rest of the default functionality:
-
-    \snippet draggableaxes/axesinputhandler.cpp 0
-
-    We'll need to modify \c mouseReleaseEvent too to clear the flag and reset the internal state:
-
-    \snippet draggableaxes/axesinputhandler.cpp 1
-
-    Then we'll modify \c {mouseMoveEvent}. Here we check if the \c m_mousePressed is \c true and
-    our internal state is something other than \c StateNormal. If so, we'll set the input positions
-    for mouse move distance calculations and call the axis dragging function (see
-    \l {Implementing axis dragging} for details):
-
-    \snippet draggableaxes/axesinputhandler.cpp 2
-
-    We don't need to change the functionality of mouse wheel, so we will not re-implement that.
-
-    \section1 Implementing Axis Dragging
-
-    First we need to start listening to the selection signal from the graph. We do that in the
-    constructor, and connect it to \c handleElementSelected method:
-
-    \snippet draggableaxes/axesinputhandler.cpp 3
-
-    In \c handleElementSelected we check the type of the selection and set our internal state based on
-    it:
-
-    \snippet draggableaxes/axesinputhandler.cpp 4
-
-    The actual dragging logic is implemented in \c handleAxisDragging method, which we call from
-    \c mouseMoveEvent in case the required conditions are met:
-
-    \snippet draggableaxes/axesinputhandler.cpp 5
-
-    In \c handleAxisDragging we first get the scene orientation from our active camera:
-
-    \snippet draggableaxes/axesinputhandler.cpp 6
-
-    Then we calculate the modifiers to mouse move direction based on the orientation:
-
-    \snippet draggableaxes/axesinputhandler.cpp 7
-
-    After that, we calculate the mouse movement, and modify it based on the y rotation of the
-    camera:
-
-    \snippet draggableaxes/axesinputhandler.cpp 8
-
-    And finally apply the moved distance to the correct axis:
-
-    \snippet draggableaxes/axesinputhandler.cpp 9
-
-    We also have a function for setting the dragging speed:
-
-    \snippet draggableaxes/axesinputhandler.h 1
-
-    This is needed, as the mouse movement distance is absolute (in screen coordinates) and we
-    need to adjust it to the axis range. The larger the value, the slower the dragging will be.
-    Note that on this example we do not take scene zoom level into account when determining the
-    drag speed, so you'll notice changes in the range adjustment as you change the zoom level.
-
-    The modifier could be adjusted automatically based on the axis range and camera zoom level, but
-    we'll leave implementing that as an excercise for the reader.
-
-    \section1 Example Contents
-*/