childview.cpp

it s code MFC in visual studio c ++ 6.0

// ChildView.cpp : implementation of the CChildView class
//

#include "stdafx.h"
#include "MFC.h"
#include "ChildView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CChildView

CChildView::CChildView()
{
	m_nLines = 0;
	m_aPens[0].CreatePen(PS_DASH,1,RGB(0,0,255));
	m_aPens[1].CreatePen(PS_SOLID,4,RGB(255,0,0));
	m_aPens[2].CreatePen(PS_SOLID,8,RGB(0,255,0));
	m_nPenIndex = 0;
}

CChildView::~CChildView()
{
}


BEGIN_MESSAGE_MAP(CChildView,CWnd )
	//{{AFX_MSG_MAP(CChildView)
	ON_WM_PAINT()
	ON_WM_LBUTTONDOWN()
	ON_WM_CHAR()
	ON_WM_MBUTTONDBLCLK()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


/////////////////////////////////////////////////////////////////////////////
// CChildView message handlers

BOOL CChildView::PreCreateWindow(CREATESTRUCT& cs) 
{
	if (!CWnd::PreCreateWindow(cs))
		return FALSE;

	cs.dwExStyle |= WS_EX_CLIENTEDGE;
	cs.style &= ~WS_BORDER;
	cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS, 
		::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1), NULL);

	return TRUE;
}

void CChildView::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	// TODO: Add your message handler code here
	
	for(int i = 0;i<m_nLines;i++)
		m_apLines[i] -> Draw(&dc);

	// Do not call CWnd::OnPaint() for painting messages
}


void CChildView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	static bool bFirst = true;
	static CPoint firstPoint;


	if (m_nLines < MAX_LINES)
	{
		if (bFirst)		
		{
			firstPoint = point;
		}
		else
		{
			m_apLines[m_nLines++] = new CLine(firstPoint,point,&m_aPens[m_nPenIndex]);
			Invalidate(false);
		}
		bFirst = !bFirst;
	}


	//CWnd ::OnLButtonDown(nFlags, point);
}

void CChildView::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	if (nChar >= '1' && nChar <= '3')
	{
		m_nPenIndex = nChar - '1';
	}
	else if (nChar == '\b')
	{
		if(m_nLines > 0)
		{
			delete m_apLines[--m_nLines];
			Invalidate();
		}
	}
	//CWnd ::OnChar(nChar, nRepCnt, nFlags);
}

void CChildView::OnMButtonDblClk(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	for (int i = 0;i<m_nLines;i++)
		delete m_apLines[i];
	m_nLines = 0;
	Invalidate();
	//CWnd ::OnMButtonDblClk(nFlags, point);
}