void ShapeFrame::OnPaint(wxPaintEvent& event)
{
    wxPaintDC dc(this);
    wxGraphicsContext *gc = wxGraphicsContext::Create(dc);
    wxGraphicsMatrix trans = gc->CreateMatrix();
    setTransform(&trans);

    ShapeData *data = wxGetApp().getData();
    for(int i=0; i<data->getNumShapes(); i++)
    {
        data->getShape(i)->draw(dc, &trans);
    }
    delete gc;
}