examples-donutbreakdown.qdoc
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r1714 | /*! | ||
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r1761 | \example examples/donutbreakdown | ||
\title Donut chart breakdown example | ||||
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r1714 | \subtitle | ||
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r1761 | This example shows how to use create a donut breakdown chart using QPieSeries API. | ||
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r1909 | \image examples_donutbreakdown.png | ||
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r1888 | Let's start by defining some data for the chart. | ||
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r1888 | \snippet ../examples/donutbreakdown/main.cpp 1 | ||
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r1888 | Then we create a chart where we add the data. Note that this this is our own chart derived from QChart. | ||
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r1888 | \snippet ../examples/donutbreakdown/main.cpp 2 | ||
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r1888 | Our own chart works so that in the constructor we create a main series | ||
which aggregates the data provided by the breakdown series. This is the piechart in the center. | ||||
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r1888 | \snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 1 | ||
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r1888 | When a breakdown series is added the data is used to create a slice in the main series and the | ||
breakdown series itself is used to create a segment of a donut positioned so that it is aligned | ||||
with the corresponding slice in the main series. | ||||
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r1888 | \snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 2 | ||
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r1888 | Here's how the start and end angles for the donut segments are calculated. | ||
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r1888 | \snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 3 | ||
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r1888 | And now that we have our chart defined we can finally create a QChartView and show the chart. | ||
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r1888 | \snippet ../examples/donutbreakdown/main.cpp 3 | ||
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*/ | ||||