/* nhay phai chuot hien toa do */

#include<afxwin.h>//thu vien MFC

//lop ung dung

class CMyApp:public CWinApp

{

public:

    BOOL InitInstance();//ham khoi tao

    //ung dung

};

//lop cua so

class CMyWin:public CFrameWnd

{

private://du lieu moi cua lop

    CDC m_memDC;//ngu canh tb cua cs ao

    CBitmap m_bmp;//anh chua cs t

    CBrush m_bkbrush;//mau nen cs ao

    int maxX,maxY;

    CPoint oldPoint;//de chua td chuot

    CPen p;//but ve

    CBrush b;//choi to

public://phuoc thuc cua lop

    CMyWin();//ham tao

    //ham xu ly nhan chuot trai

    afx_msg void OnRButtonDown(UINT nFlags,CPoint pt);   

    afx_msg void OnPaint();//xu ly ve lai cs

    //ham xy ly khi nha  chuot trai

    afx_msg void OnRButtonUp(UINT nFlags,CPoint point);

    DECLARE_MESSAGE_MAP()

};

CMyApp theApp;//doi tuong cua lop ung dung

BOOL CMyApp::InitInstance()//xay dung ham kt ung dung

{

    m_pMainWnd=new CMyWin;

    m_pMainWnd->ShowWindow(m_nCmdShow);//dat tt hien cs

    m_pMainWnd->UpdateWindow();//ve cs ra man hinh

    return true;

}

//khai bao anh xa thong diep

BEGIN_MESSAGE_MAP(CMyWin,CFrameWnd)

    ON_WM_RBUTTONDOWN()    //nhan chuot trai

    ON_WM_PAINT()//ve lai cs

    ON_WM_RBUTTONUP()//nha chuot trai

END_MESSAGE_MAP()

CMyWin::CMyWin()//xay dung ham tao cs

{

    Create(NULL,"chuong trinh vi du5. 02");//tao cs

    //tao cs ao

    maxX=GetSystemMetrics(SM_CXSCREEN);

    maxY=GetSystemMetrics(SM_CYSCREEN);

    CClientDC DC(this);

    m_memDC.CreateCompatibleDC(&DC);

    m_bmp.CreateCompatibleBitmap(&DC,maxX,maxY);

    m_memDC.SelectObject(&m_bmp);

    m_bkbrush.CreateStockObject(WHITE_BRUSH);

    m_memDC.SelectObject(&m_bkbrush);

    m_memDC.PatBlt(0,0,maxX,maxY,PATCOPY);

}

void CMyWin::OnPaint()//ve lai cs

{

    CPaintDC DC(this);

    //copy tu cua so ao dua ra cs that

    DC.BitBlt(0,0,maxX,maxY,&m_memDC,0,0,SRCCOPY);

}

//xay dung ham xu ly sk cho nhan chuot trai

afx_msg void CMyWin::OnRButtonDown(UINT nFlags,CPoint pt)

{   

    CDC *dc=GetDC();//khoi tao ngu canh thiet bi

    char s[10];

    sprintf(s,"[%d,%d]",pt.x,pt.y);  //lay toa do chuot

    dc->TextOut(pt.x,pt.y,s);//viet toa do ra man hinh

    oldPoint=pt;//lua toa do lai

}

//xu ly su kien nha chuot trai

void CMyWin::OnRButtonUp(UINT nFlags,CPoint point)

{   

    char s1[20];

    m_memDC.SelectObject(&b);//chon but

    m_memDC.SelectObject(&p);//chon choi to

    sprintf(s1,"[%d,%d]",oldPoint.x,oldPoint.y); //lay toa do

    m_memDC.TextOut(oldPoint.x,oldPoint.y,  s1);//ve len cs ao

}