Qt 4.0: Concentric Circles Example

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# Concentric Circles Example

Files:

- painting/concentriccircles/circlewidget.cpp
- painting/concentriccircles/circlewidget.h
- painting/concentriccircles/window.cpp
- painting/concentriccircles/window.h
- painting/concentriccircles/main.cpp

The Concentric Circles example shows the improved rendering quality that can be obtained when using floating point precision and anti-aliasing when drawing custom widgets.