~DrawingView() {}
bool OnCreate(wxDocument *doc, long flags);
void OnDraw(wxDC *dc);
void OnUpdate(wxView *sender, wxObject *hint = (wxObject *) NULL);
~DrawingView() {}
bool OnCreate(wxDocument *doc, long flags);
void OnDraw(wxDC *dc);
void OnUpdate(wxView *sender, wxObject *hint = (wxObject *) NULL);