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/*!
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\example example/barchart
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\title BarChart Example
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\subtitle
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The example shows how to create simple bar chart. Barchart shows the data in sets as separate bars, which are grouped in categories.
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\image barchart.png
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First we define categories.
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\snippet ../example/barchart/main.cpp 1
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Data that barchart visualizes, is defined by QBarSet instances. Here we create some sets and append data
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we want to visulaize to them.
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\snippet ../example/barchart/main.cpp 2
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To combine the sets and categories to a chart, we need to create QBarSeries instance. When creating
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the QBarSeries, the categories must be known. Sets can be added later. For example purposes the sets
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are added to series here.
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\snippet ../example/barchart/main.cpp 3
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We want our barchart to behave so, that when mouse is hovered over bar, the name of set which the bar
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represents is shown as tooltip.
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Also when we click the bar, floating values for the set are toggled. Floating values are the data values
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that are drawn on top of bars.
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\snippet ../example/barchart/main.cpp 4
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Here we create the view and add our series to it. Also we set the title and theme we want our chart to use
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\snippet ../example/barchart/main.cpp 5
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For barchart, we don't need X-axis to be visible, so it can be disabled.
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\snippet ../example/barchart/main.cpp 6
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*/
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