// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only

/*!
    \example zoomlinechart
    \title Zoom Line Example
    \ingroup qtcharts_examples
    \examplecategory {Data Visualization}
    \brief The example shows how to create your own custom zooming effect.

    The example shows how to create your own custom zooming effect with QRubberBand by using a mouse
    and how to use touch gestures for paning and zooming.
    \image examples_zoomlinechart1.png {Screenshot showing a wave chart example}
    \image examples_zoomlinechart2.png {Screenshot of the wave chart being zoomed in}

    \include examples-run.qdocinc

    \section1 Customizing Zooming Effects

    Let's first create a line series with some example data.
    \snippet zoomlinechart/main.cpp 1

    Then we create a custom chart view by deriving from QChartView:
    \snippet zoomlinechart/chartview.h 1

    We override mouse and key event handling
    \snippet zoomlinechart/chartview.h 2

    Then we implement a custom logic for mouse and key events. For example pressing the '+' key will zoom in and pressing
    the '-' key will zoom out.
    \snippet zoomlinechart/chartview.cpp 1

    We also create our own QChart:
    \snippet zoomlinechart/chart.h 1

    Where we can handle the gestures:
    \snippet zoomlinechart/chart.cpp 1

    Note that you will need to call grabGesture() to both QMainWindow and QChart.
*/
