This simple class provides a simple way to avoid flicker: when drawing on it, everything is in fact first drawn on an in-memory buffer (a wxBitmap) and then copied to the screen only once, when this object is destroyed.
It can be used in the same way as any other device context. wxBufferedDC itself typically replaces wxClientDC, if you want to use it in your OnPaint() handler, you should look at wxBufferedPaintDC.
wxBufferedDC(wxDC *dc, const wxSize& area)
wxBufferedDC(wxDC *dc, const wxBitmap& buffer)
If you use the first, default, constructor, you must call one of the Init methods later in order to use the object.
The other constructors initialize the object immediately and Init() must not be called after using them.
void Init(wxDC *dc, const wxSize& area)
void Init(wxDC *dc, const wxBitmap& buffer)
These functions initialize the object created using the default constructor. Please see constructors documentation for details.
Copies everything drawn on the DC so far to the underlying DC associated with this object, if any.