First Call SystemGc () to obtain a graphics context, SystemGc () is a member function CCoeControl then set the appropriate graphics context item last call drawing functions DrawRect () draw a rectangle. All graphics are the context through graphics (graphics context, GC) to complete. In Symbian OS, the definition of an abstract class CGraphicsContext graphics context to unify the interface for device-independent graphics to provide a rich API.

Symbian OS控件开发之CCoeControl.doc

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