绘图基础--鼠标移动画点

// draw1.cpp  
  
#include <afxwin.h>  
  
// Define the application class  
class CApp : public CWinApp  
{  
public:  
    virtual BOOL InitInstance();  
};  
  
CApp App;    
  
// define the window class  
class CWindow : public CFrameWnd  
{   
public:  
    CWindow();   
    afx_msg void OnMouseMove(UINT,CPoint);  
    DECLARE_MESSAGE_MAP()  
};  
  
// The window's constructor  
CWindow::CWindow()  
{   
    Create(NULL, "Drawing Tests",   
        WS_OVERLAPPEDWINDOW,  
        CRect(0,0,250,250));   
}  
  
// The messahe map  
BEGIN_MESSAGE_MAP( CWindow, CFrameWnd )  
    ON_WM_MOUSEMOVE()     
END_MESSAGE_MAP()  
  
// Handle mouse movement  
void CWindow::OnMouseMove(UINT flag,   
    CPoint mousePos)  
{  
    //按住鼠标左键移动时，画点  
    if (flag == MK_LBUTTON)  
    {  
        CClientDC dc(this);  
        dc.SetPixel(mousePos,RGB(0,0,255));  //蓝色  
        //dc.SetPixel(mousePos,RGB(rand()%256,rand()%256,rand()%256));  
    }  
  
    //按住鼠标右键移动时，擦除点  
    if (flag == MK_RBUTTON)  
    {  
        CClientDC dc(this);  
        dc.SetPixel(mousePos,RGB(255,255,255));  //白色  
    }  
}  
  
// Init the application  
BOOL CApp::InitInstance()  
{  
    m_pMainWnd = new CWindow();  
    m_pMainWnd->ShowWindow(m_nCmdShow);  
    m_pMainWnd->UpdateWindow();  
    return TRUE;  
}