drwview.cpp

用VC做的一个画直线和曲线的程序。

// drwView.cpp : implementation of the CDrwView class
//

#include "stdafx.h"
#include "drw.h"

#include "drwDoc.h"
#include "drwView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDrwView

IMPLEMENT_DYNCREATE(CDrwView, CView)

BEGIN_MESSAGE_MAP(CDrwView, CView)
	//{{AFX_MSG_MAP(CDrwView)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	ON_COMMAND(ID_LINE, OnLine)
	ON_UPDATE_COMMAND_UI(ID_LINE, OnUpdateLine)
	ON_COMMAND(ID_CURVE, OnCurve)
	ON_UPDATE_COMMAND_UI(ID_CURVE, OnUpdateCurve)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrwView construction/destruction

CDrwView::CDrwView()
{
	// TODO: add construction code here
 DrawWhat=1;
}

CDrwView::~CDrwView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CDrwView drawing

void CDrwView::OnDraw(CDC* pDC)
{
	CDrwDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	pDoc->DrawLine(pDC);
}

/////////////////////////////////////////////////////////////////////////////
// CDrwView printing

BOOL CDrwView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CDrwView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CDrwView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CDrwView diagnostics

#ifdef _DEBUG
void CDrwView::AssertValid() const
{
	CView::AssertValid();
}

void CDrwView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

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

/////////////////////////////////////////////////////////////////////////////
// CDrwView message handlers

void CDrwView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	
	SetCapture();
	point0=point1=point;
	CView::OnLButtonDown(nFlags, point);
}

void CDrwView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CDrwDoc* pDoc = GetDocument();
	if(GetCapture()==this)
	{
	 ReleaseCapture();
	 if(DrawWhat==1)  //画直线
	 {
	 CDC* pDC=GetDC();
	 CLine* Line=pDoc->AddLine(point0,point);
	 Line->Draw(pDC);
	 }
	}

	CView::OnLButtonUp(nFlags, point);
}

void CDrwView::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CDrwDoc* pDoc = GetDocument();
	if(GetCapture()==this)
		if(DrawWhat==2)       //画曲线
		{
			CDC* pDC=GetDC();
			pDoc->AddLine(point0,point);
			point0=point;
			OnDraw(pDC);
		}
	else                       //画直线
	{ CPen Pen1(PS_SOLID,1,RGB(255,255,255));
	  CPen *oldPen;
		CDC* pDC=GetDC();
		//        //要求文档重绘
		oldPen=pDC->SelectObject(&Pen1);
		pDC->MoveTo(point0);   
		pDC->LineTo(point1);
		pDC->SelectObject(oldPen);
		pDC->MoveTo(point0);
		pDC->LineTo(point);
		OnDraw(pDC);
		point1=point;
	}


	CView::OnMouseMove(nFlags, point);
}

void CDrwView::OnLine() 
{
	// TODO: Add your command handler code here
	DrawWhat=1;
}

void CDrwView::OnUpdateLine(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetCheck(DrawWhat==1);
}

void CDrwView::OnCurve() 
{
	// TODO: Add your command handler code here
	DrawWhat=2;
}

void CDrwView::OnUpdateCurve(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	pCmdUI->SetCheck(DrawWhat==2);
}