/*!
     \example examples/areachart
     \title AreaChart Example
     \subtitle

     The example shows how to create simple area chart.

    \image examples_areachart.png
    
    To create area charts, we need two QLineSeries instances. They are going to define upper and lower boundary of the area. 

    \snippet ../examples/areachart/main.cpp 1

    We add data to both series, we use stream operator.  

    \snippet ../examples/areachart/main.cpp 2

    Now we create QAreaSeries instance using two line series objects. We set the custom gradient fill and width of the outline. 

    \snippet ../examples/areachart/main.cpp 3
    
    In the end we create QChartView instance, set title, set anti-aliasing and add area series. We also set the specific range for axes. 
    
    \snippet ../examples/areachart/main.cpp 4 
    
    Chart is ready to be shown.
    
    \snippet ../examples/areachart/main.cpp 5 
    
*/