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/*!
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\example examples/modeldata
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\title Model data example
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\subtitle
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This example shows how to use QAbstractItemModel derived model as the data for the series.
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\image modeldata.png
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Let's start by creating an instance of CustomTableModel class.
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CustomTableModel class is derived from QAbstractTableModel and it was created for the purpose of this example.
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The constructor of this class populates the internal data store of the model with the data that is good for our chart example.
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\snippet ../examples/modeldata/tablewidget.cpp 1
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We now have a model with data that we would like to display both on the chart and in a QTableView.
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First, we create QTableView and tell it use the model as a data source.
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\snippet ../examples/modeldata/tablewidget.cpp 2
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Now we need QChart instance to display the same data on the chart.
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We also enable animations. It makes it easier to see how modifying the model's data affect the chart.
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\snippet ../examples/modeldata/tablewidget.cpp 3
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Then let's create two QLineSeries and tell them to use the data from the model.
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First line of the code below creates new line series. Line number two sets the model as the data source for the series.
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Third line specifies that x coordinates are taken from the model's column(Qt::Vertical) with index 0 and the y coordinates are taken from the model's column with index 1.
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Finally the series is added to the chart.
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\snippet ../examples/modeldata/tablewidget.cpp 4
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To show in QTableView which data coresponds with which series this example uses table coloring.
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When series is added to the chart it is assigned a color beased on the currently selected theme.
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Code below extracts that color from the series and uses it to create colored QTableView.
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Coloring of the view is not a part of the QChart functionality.
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\snippet ../examples/modeldata/tablewidget.cpp 5
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The same operations are done with second series. Notice that for this series different columns of the same model are mapped.
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\snippet ../examples/modeldata/tablewidget.cpp 6
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\snippet ../examples/modeldata/tablewidget.cpp 7
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To avoid setting up the QGraphicsScene we use QChartView class that does it for us. QChart object pointer is used as a parameter of the QChartView constructor.
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To make the render look nicer Antialiasing is turned on and the minimum size of the chart is set.
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\snippet ../examples/modeldata/tablewidget.cpp 8
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Finally we place both widgets in a layout and use the layout as the application layout.
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\snippet ../examples/modeldata/tablewidget.cpp 9
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Application is ready. Try modifying the data in the table view and see how it affects the chart.
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*/
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