Help Drawing into a Dialog

Hello,

What I have done now is simple draw a BITMAP into a dialogue
windows(adding a variable ellipse), it works fine, it display and I
can change the position of the ellipse in the map but I can not erase
the previous drawing, I think it is something because the
CDialog::OnInitDialog() is is not a part of the Dlg class, isn't it? I
am not sure what is going on here. I think I should be able to reset
the map only calling the CDialog::OnInitDialog() routine. But it doest
not work.

Thank you for any help here,

Regards,

Here is the code on *Dlg.cpp

// BitMapInDIALOGDlg.cpp : implementation file
//

#include "stdafx.h"
#include "BitMapInDIALOG.h"
#include "BitMapInDIALOGDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CBitMapInDIALOGDlg dialog

CBitMapInDIALOGDlg::CBitMapInDIALOGDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CBitMapInDIALOGDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CBitMapInDIALOGDlg)
    //}}AFX_DATA_INIT
    // Note that LoadIcon does not require a subsequent DestroyIcon in
Win32
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CBitMapInDIALOGDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CBitMapInDIALOGDlg)
    DDX_Control(pDX, IDC_PICTURE, m_Picture);
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CBitMapInDIALOGDlg, CDialog)
    //{{AFX_MSG_MAP(CBitMapInDIALOGDlg)
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_SubmitBtn, OnSubmitBtn)
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBitMapInDIALOGDlg message handlers

BOOL CBitMapInDIALOGDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // Set the icon for this dialog. The framework does this
automatically
    // when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE); // Set big icon
    SetIcon(m_hIcon, FALSE); // Set small icon

    // TODO: Add extra initialization here
    BITMAP BM;
    BITMAP BMCLE; //for clear map no markrs
    Bmp1.LoadBitmap (IDB_BITMAP1);
    Bmp1CLE.LoadBitmap (IDB_BITMAP2);//for clear map no markrs
    Bmp1.GetObject (sizeof (BM), &BM);
    Bmp1CLE.GetObject (sizeof (BMCLE), &BMCLE);//for clear map no markrs
    m_BitmapWidth = BM.bmWidth;
    m_BitmapWidthCLE = BM.bmWidth;//for clear map no markrs
    m_BitmapHeight = BM.bmHeight;
    m_BitmapHeightCLE = BM.bmHeight;//for clear map no markrs
/* CDC MemDC;
    CDC MemDCCLE; //for clear map no markrs
//RECT ClientRect;
//RECT ClientRectCLE;//for clear map no markrs
// create memory device context object and select bitmap
// object into it:
MemDC.CreateCompatibleDC (NULL);
MemDCCLE.CreateCompatibleDC (NULL);//for clear map no markrs
MemDC.SelectObject (&Bmp1);
MemDCCLE.SelectObject (&Bmp1CLE); //for clear map no markrs
int x11 = xposition - 6;
int y11 = yposition - 6;
int x22 = xposition + 6;
int y22 = yposition + 6;
MemDC.Ellipse (x11, y11, x22, y22);*/

    m_Picture.SetBitmap(Bmp1);

    SetDlgItemText(IDC_EDIT1x,"194");
    SetDlgItemText(IDC_EDIT2y,"250");

    return TRUE; // return TRUE unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code
below
// to draw the icon. For MFC applications using the document/view
model,
// this is automatically done for you by the framework.
int xposition = 194;
int yposition = 199;
void CBitMapInDIALOGDlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
// CPaintDC dc(this); // device context for painting

// Bmp1.LoadBitmap(IDB_BITMAP1);

        CDC MemDC;
        CDC MemDCCLE; //for clear map no markrs
// RECT ClientRect;
// RECT ClientRectCLE;//for clear map no markrs
// create memory device context object and select bitmap
// object into it:
        MemDC.CreateCompatibleDC (NULL);
        MemDCCLE.CreateCompatibleDC (NULL);//for clear map no markrs
        MemDC.SelectObject (&Bmp1);
        MemDCCLE.SelectObject (&Bmp1CLE); //for clear map no markrs
        int x11 = xposition - 6;
        int y11 = yposition - 6;
        int x22 = xposition + 6;
        int y22 = yposition + 6;
        MemDC.Ellipse (x11, y11, x22, y22);

        MemDC.DeleteDC ();
        CDialog::OnPaint();
    }
}

// The system calls this to obtain the cursor to display while the
user drags
// the minimized window.
HCURSOR CBitMapInDIALOGDlg::OnQueryDragIcon()
{
    return (HCURSOR) m_hIcon;
}

void CBitMapInDIALOGDlg::OnSubmitBtn()
{
    // TODO: Add your control notification handler code here

// This works
    /*
    int xe = 3445;
    char buffer[20];

    _itoa(xe, buffer, 10 );

    // TODO: Add your control notification handler code here
    SetDlgItemText(IDC_EDIT1,buffer);
////////////////////////////////////////*/

    //xposition = atoi(strXcoordi1);
//yposition = atoi(strYcoordi1);
//char buffer[20];
CString buffercharx;
CString bufferchary;
GetDlgItemText(IDC_EDIT1x,buffercharx);
GetDlgItemText(IDC_EDIT2y,bufferchary);
xposition = atoi(buffercharx);
yposition = atoi(bufferchary);

CDialog::OnInitDialog();

CBitMapInDIALOGDlg::OnPaint();

Invalidate();
}