drawlineview.cpp

VisualC高级编程技术精粹.rar

// DrawLineView.cpp : implementation of the CDrawLineView class
//

#include "stdafx.h"
#include "DrawLine.h"

#include "DrawLineDoc.h"
#include "DrawLineView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView

IMPLEMENT_DYNCREATE(CDrawLineView, CEditView)

BEGIN_MESSAGE_MAP(CDrawLineView, CEditView)
	//{{AFX_MSG_MAP(CDrawLineView)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CEditView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CEditView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CEditView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView construction/destruction

CDrawLineView::CDrawLineView()
{
	// TODO: add construction code here
    startpt.x = -1;
	startpt.y = -1;
}

CDrawLineView::~CDrawLineView()
{
}

BOOL CDrawLineView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	BOOL bPreCreated = CEditView::PreCreateWindow(cs);
	cs.style &= ~(ES_AUTOHSCROLL|WS_HSCROLL);	// Enable word-wrapping

	return bPreCreated;
}

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView drawing

void CDrawLineView::OnDraw(CDC* pDC)
{
	CDrawLineDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView printing

BOOL CDrawLineView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default CEditView preparation
	return CEditView::OnPreparePrinting(pInfo);
}

void CDrawLineView::OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo)
{
	// Default CEditView begin printing.
	CEditView::OnBeginPrinting(pDC, pInfo);
}

void CDrawLineView::OnEndPrinting(CDC* pDC, CPrintInfo* pInfo)
{
	// Default CEditView end printing
	CEditView::OnEndPrinting(pDC, pInfo);
}

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView diagnostics

#ifdef _DEBUG
void CDrawLineView::AssertValid() const
{
	CEditView::AssertValid();
}

void CDrawLineView::Dump(CDumpContext& dc) const
{
	CEditView::Dump(dc);
}

CDrawLineDoc* CDrawLineView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CDrawLineDoc)));
	return (CDrawLineDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CDrawLineView message handlers

void CDrawLineView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	startpt = point; //将鼠标按下的位置作为开始点
	CEditView::OnLButtonDown(nFlags, point);
}

void CDrawLineView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	startpt = -1;//重新初始化变量
	CEditView::OnLButtonUp(nFlags, point);
}

void CDrawLineView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CClientDC dc(this);
	if (startpt.x != -1)
	{
		dc.MoveTo(startpt.x,startpt.y); //移动到给定的开始点
		dc.LineTo(point); //绘制一条直线
		startpt = point;
	}
	CEditView::OnMouseMove(nFlags, point);
}