void OnPaint(wxPaintEvent& event);
void DrawField(wxDC *, int xc1, int yc1, int xc2, int yc2);
void Refresh(int xc1, int yc1, int xc2, int yc2);
void OnPaint(wxPaintEvent& event);
void DrawField(wxDC *, int xc1, int yc1, int xc2, int yc2);
void Refresh(int xc1, int yc1, int xc2, int yc2);