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Chartviewer demo removed. Fixed a typo in docs

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Marek Rosa Documented the donutdrilldown chart example	r1714	/*!
Marek Rosa Renamed donutdrilldown example to donutbreakdown	r1761	\example examples/donutbreakdown
		\title Donut chart breakdown example
Marek Rosa Documented the donutdrilldown chart example	r1714	\subtitle

Marek Rosa Renamed donutdrilldown example to donutbreakdown	r1761	This example shows how to use create a donut breakdown chart using QPieSeries API.
Jani Honkonen Doc updates	r1909	\image examples_donutbreakdown.png
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	Let's start by defining some data for the chart.
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	\snippet ../examples/donutbreakdown/main.cpp 1
Marek Rosa Documented the donutdrilldown chart example	r1714
Marek Rosa Docs fix: removed duplicated word, function is named append not add	r1992	Then we create a chart where we add the data. Note that this is our own chart derived from QChart.
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	\snippet ../examples/donutbreakdown/main.cpp 2
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	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.
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	\snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 1
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	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.
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	\snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 2
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	Here's how the start and end angles for the donut segments are calculated.
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	\snippet ../examples/donutbreakdown/donutbreakdownchart.cpp 3
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	And now that we have our chart defined we can finally create a QChartView and show the chart.
Marek Rosa Documented the donutdrilldown chart example	r1714
Jani Honkonen Update donutbreakdown example docs	r1888	\snippet ../examples/donutbreakdown/main.cpp 3
Marek Rosa Documented the donutdrilldown chart example	r1714
		*/

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