/*!
    \example examples/presenterchart
    \title PresenterChart Example
    \subtitle

    The example shows how to create chart which presents the same set of data as line, scatter, spline and area charts.
    ChartPresenter will switch between these four chart types every few seconds. Note: You can also use the
    QAbstractItemModel related APIs to pass data for the different series types. See the \l {Model data example} for
    more details.

    \image examples_presenterchart1.png
    \image examples_presenterchart2.png
    \image examples_presenterchart3.png
    \image examples_presenterchart4.png

    We create simple ChartView class which derives form QChartView. 

    \snippet ../examples/presenterchart/chartview.h 1

    Class will implement \c handleTimeout() slot which we are going to use to trigger switching between different chart presentations. 
    We are also going to provide \c handlePoitClicked() slot which will show clicked point on the chart. 
    Class members \c m_series and \c m_titles are going to store series and related titles. In example we are going to present data as a line chart
    using QLineSeries , as scatter chart using QScatterSeries, as a spline chart using QSplineSeries and a area chart using QAreaSeries. We create needed instances in constructor of ChartView class.    

    \snippet ../examples/presenterchart/chartview.cpp 1

    We add data to three series. Please note area chart is going to use QLineSeries as the upper line. We can use add() member function.

    \snippet ../examples/presenterchart/chartview.cpp 2

    In the end we store references all the created series and matching titles. 

    \snippet ../examples/presenterchart/chartview.cpp 3

    In  \c handleTimeout() slot  we change currently displayed chart by removing previous series and adding next series from the \c m_series list. We also set proper title and create the axes for the chart.

    \snippet ../examples/presenterchart/chartview.cpp 4
*/