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Improvements to QSpline model support

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Michal Klocek Update scatter example and docs	r471	/*!
Tero Ahola Fixing example documentation	r500	\example examples/scatterchart
Michal Klocek Update scatter example and docs	r471	\title ScatterChart Example
		\subtitle

		The example shows how to create simple scatter chart.

Tero Ahola Documentation front page	r979	\image examples_scatterchart.png
Michal Klocek Update scatter example and docs	r471
		To create scatter charts, QScatterSeries instance is needed. Here we create scatter series instance and we set the type, color and width of outline for scatter points.

Tero Ahola Fixed presenter and scatter examples and their documentation.	r1015	\snippet ../examples/scatterchart/chartview.cpp 1
Michal Klocek Update scatter example and docs	r471
		We add data to be shown. We can use add() member function or use stream operator.

Tero Ahola Fixed presenter and scatter examples and their documentation.	r1015	\snippet ../examples/scatterchart/chartview.cpp 2
Michal Klocek Update scatter example and docs	r471
Tero Ahola Fixed presenter and scatter examples and their documentation.	r1015	In the end we enable anti-aliasing, set the chart title and add the scatter series onto the chart. We also disable
		drop shadow, because it would not look good on an application with only chart view shown.
Michal Klocek Update scatter example and docs	r471
Tero Ahola Fixed presenter and scatter examples and their documentation.	r1015	\snippet ../examples/scatterchart/chartview.cpp 3
Michal Klocek Update scatter example and docs	r471
		Chart is ready to be shown.

Tero Ahola Fixed presenter and scatter examples and their documentation.	r1015	\snippet ../examples/scatterchart/main.cpp 4
Michal Klocek Update scatter example and docs	r471
Tero Ahola Documentation front page	r979	*/

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