// La classe servant de support au dessin
class MyCanvas : public wxScrolledWindow
{
    public:
        MyCanvas(wxWindow *parent);
        virtual void OnDraw(wxDC& dc);
};
 
// La classe "fille MDI"
class MyChild: public wxMDIChildFrame
{
    public:
        MyChild(wxMDIParentFrame *parent, const wxString& title);
    private:
        MyCanvas *m_canvas;
};
 
// La fenêtre principale
class MyFrame : public wxMDIParentFrame
{
    public:
        MyFrame(wxWindow *parent, const wxString& title);
    private:
        void OnNewChildWindow(wxCommandEvent& event);
        DECLARE_EVENT_TABLE()
};
 

MyCanvas::MyCanvas(wxWindow *parent)
        : wxScrolledWindow(parent, wxID_ANY, wxDefaultPosition, wxDefaultSize,
        wxSUNKEN_BORDER | wxNO_FULL_REPAINT_ON_RESIZE | wxVSCROLL | wxHSCROLL)
{
    // Le fond du dessin sera blanc
    SetBackgroundColour(wxColour(_T("WHITE")));
    // Et la taille virtuelle sera de 500x500
    SetScrollbars(10, 10, 50, 50);
}
// La méthode de dessin, directement tirée de l'exemple wxWidgets
void MyCanvas::OnDraw(wxDC& dc)
{
    dc.SetFont(*wxSWISS_FONT);
    dc.SetPen(*wxGREEN_PEN);
    dc.DrawLine(0, 0, 200, 200);
    dc.DrawLine(200, 0, 0, 200);
 
    dc.SetBrush(*wxCYAN_BRUSH);
    dc.SetPen(*wxRED_PEN);
    dc.DrawRectangle(100, 100, 100, 50);
    dc.DrawRoundedRectangle(150, 150, 100, 50, 20);
 
    dc.DrawEllipse(250, 250, 100, 50);
#if wxUSE_SPLINES
    dc.DrawSpline(50, 200, 50, 100, 200, 10);
#endif // wxUSE_SPLINES
    dc.DrawLine(50, 230, 200, 230);
    dc.DrawText(_T("This is a test string"), 50, 230);
 
    wxPoint points[3];
    points[0].x = 200; points[0].y = 300;
    points[1].x = 100; points[1].y = 400;
    points[2].x = 300; points[2].y = 400;
 
    dc.DrawPolygon(3, points);
}
 
 
MyChild::MyChild(wxMDIParentFrame *parent, const wxString& title)
        : wxMDIChildFrame(parent, wxID_ANY, title, wxDefaultPosition, wxDefaultSize,
        wxDEFAULT_FRAME_STYLE | wxNO_FULL_REPAINT_ON_RESIZE)
{
    m_canvas = new MyCanvas(this);
}
 
 
BEGIN_EVENT_TABLE(MyFrame, wxMDIParentFrame)
    EVT_MENU(wxID_NEW, MyFrame::OnNewChildWindow)
END_EVENT_TABLE()
 
MyFrame::MyFrame(wxWindow *parent, const wxString& title) : wxMDIParentFrame(parent, -1, title)
{
    SetClientSize(500,400);
 
    wxMenu *file_menu = new wxMenu();
    file_menu->Append(wxID_NEW, _T("&New child\tCtrl-N"));
 
    wxMenuBar *menu_bar = new wxMenuBar();
    menu_bar->Append(file_menu, _T("&File"));
    SetMenuBar(menu_bar);
}
 
void MyFrame::OnNewChildWindow(wxCommandEvent& event)
{
    MyChild *subframe;
    subframe = new MyChild(this, _T("Canvas Frame"));
}