绘图基础--鼠标移动画点

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;

}