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/*!
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\example examples/donutbreakdown
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\title Donut chart breakdown example
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\subtitle
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This example shows how to use create a donut breakdown chart using QPieSeries API.
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\image examples_donutbreakdown.png
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Let's start by defining some data for the chart.
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\snippet ../examples/donutbreakdown/main.cpp 1
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Then we create a chart where we add the data. Note that this is our own chart derived from QChart.
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\snippet ../examples/donutbreakdown/main.cpp 2
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Our own chart works so that in the constructor we create a main series
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which aggregates the data provided by the breakdown series. This is the piechart in the center.
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\snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 1
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When a breakdown series is added the data is used to create a slice in the main series and the
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breakdown series itself is used to create a segment of a donut positioned so that it is aligned
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with the corresponding slice in the main series.
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\snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 2
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Here's how the start and end angles for the donut segments are calculated.
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\snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 3
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Legend markers are customized to show the breakdown percentage and markers for the main level slices are hidden.
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\snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 4
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Instead the main level slices show the percentage on the label.
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\snippet ../examples/donutbreakdown/mainslice.cpp 1
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\snippet ../examples/donutbreakdown/mainslice.cpp 2
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And now that we have our chart defined we can finally create a QChartView and show the chart.
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\snippet ../examples/donutbreakdown/main.cpp 3
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*/
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