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Fix Charts documentation...
Fix Charts documentation The documentation structure is changed so that it can be generated with both Qt5 and Qt4. Also the erroneous VBarModelMapper is removed from VBoxPlotModelMapper documentation. Task-number: QTRD-2492, QTRD-2495 Change-Id: I45028915ca55f6ff1170db58518a8f08ac4158fb Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>

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/*!
\example examples/areachart
\title AreaChart Example
\subtitle
The example shows how to create a simple area chart.
\image examples_areachart.png
To create area charts, we need two QLineSeries instances. They are going to define the upper and lower boundary of the area.
\snippet ../examples/areachart/main.cpp 1
We add data to both series and use the stream operator.
\snippet ../examples/areachart/main.cpp 2
Now we create a QAreaSeries instance using two line series objects. We set the custom gradient fill and width of the outline.
\snippet ../examples/areachart/main.cpp 3
Last we create the QChartView instance, set the title, set anti-aliasing, and add the area series. We also create the default axes and specify the ranges on them.
\snippet ../examples/areachart/main.cpp 4
The chart is ready to be shown.
\snippet ../examples/areachart/main.cpp 5
*/