cloudview.cpp

这是书上的代码

// CloudView.cpp : implementation of the CCloudView class
//

#include "stdafx.h"
#include "Cloud.h"

#include "CloudDoc.h"
#include "CloudView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CCloudView

IMPLEMENT_DYNCREATE(CCloudView, CScrollView)

BEGIN_MESSAGE_MAP(CCloudView, CScrollView)
	//{{AFX_MSG_MAP(CCloudView)
	ON_WM_CREATE()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CScrollView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CScrollView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCloudView construction/destruction

CCloudView::CCloudView()
{

}

CCloudView::~CCloudView()
{
}

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

	return CScrollView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CCloudView drawing

void CCloudView::OnDraw(CDC* pDC)
{
	CCloudDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	CSize sizeTotal;	
	CDib* pDib = pDoc->m_Dib;


	if(pDib)
	{
		CDC memDC;	    	
    	long width,height;
		width=pDib->GetImageWidth();
    	height=pDib->GetImageHeight();
			
		memDC.CreateCompatibleDC(pDC);


		RECT rect;
		GetClientRect(&rect);
		sizeTotal.cx=width;
		sizeTotal.cy=height;
		SetScrollSizes(MM_TEXT, sizeTotal);

   		CBitmap* pOldBitmap = memDC.SelectObject(m_bitmap);


		pDib->PaintDIB(memDC.m_hDC,width,height);
		pDC->BitBlt(0, 0,width,height, &memDC, 0, 0, SRCCOPY);

		memDC.SelectObject(pOldBitmap);
		ReleaseDC(&memDC);

	}
		

}
	

void CCloudView::OnInitialUpdate()
{
	CScrollView::OnInitialUpdate();

	CSize sizeTotal;
	// TODO: calculate the total size of this view
	sizeTotal.cx = sizeTotal.cy = 100;
	SetScrollSizes(MM_TEXT, sizeTotal);
}

/////////////////////////////////////////////////////////////////////////////
// CCloudView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CCloudView diagnostics

#ifdef _DEBUG
void CCloudView::AssertValid() const
{
	CScrollView::AssertValid();
}

void CCloudView::Dump(CDumpContext& dc) const
{
	CScrollView::Dump(dc);
}

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

////////////////////////////////////////////////////////////////////////////




int CCloudView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CScrollView::OnCreate(lpCreateStruct) == -1)
		return -1;
	CDC* dc=GetDC();
	m_bitmap=new CBitmap;
 	m_bitmap->CreateCompatibleBitmap(dc,4000,3000);
 	ReleaseDC(dc);

	
	return 0;
}



/*void CCloudView::OnPaint() 
{
	CCloudDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	CPaintDC dc(this); // device context for painting
	CDib* pDib = pDoc->m_Dib;
	
	if(pDoc->sign==1)
	{

		CSize sizeTotal;	
		sizeTotal.cy=pDib->GetImageHeight();
		sizeTotal.cx=pDib->GetImageWidth();
		SetScrollSizes(MM_TEXT, sizeTotal);

		SetDIBitsToDevice(dc.m_hDC,0,0,pDib->GetImageWidth(),
			pDib->GetImageHeight(),
			0,
			0,
			0,
			pDib->GetImageHeight(),pDib->lpDIBBits,
			pDib->bmpInfo,DIB_RGB_COLORS);
	}
/*	if(pDoc->sign==1)
	{
		CDC memDC;	    	
    	long width,height;
		width=pDib->GetImageWidth();
    	height=pDib->GetImageHeight();
    	CSize sizeTotal;	
		CDC* pDC=GetDC();	
		memDC.CreateCompatibleDC(pDC);
		ReleaseDC(pDC);


		CBitmap bmp;
		CreatBitmap(&bmp,width,height);
   		CBitmap* pOldBitmap = memDC.SelectObject(&bmp);
		RECT rect;
		GetClientRect(&rect);
		sizeTotal.cx=rect.right;
		sizeTotal.cy=rect.bottom;
		SetScrollSizes(MM_TEXT, sizeTotal);
		
		pDib->PaintDIB(memDC.m_hDC,rect.right,rect.bottom);
		dc.BitBlt(0, 0,width,height, &memDC, 0, 0, SRCCOPY);
		memDC.SelectObject(pOldBitmap);
		ReleaseDC(&memDC);

			
		sizeTotal.cx=width;
		sizeTotal.cy=height;
		SetScrollSizes(MM_TEXT, sizeTotal);

		BYTE* lpDIBBits=pDib->lpDIBBits;
		int w=width;
		int h=height;
		int sign=w%2;
		long total=w*h*3;
		long tmp=0;
		if(sign)
			w+=1;
		for(int i=0;i<=h;i++)
		{
			for(int j=0;j<w;j++)
			{
			
				pDC->SetPixel(j+10,h-i,RGB(lpDIBBits[tmp+2],lpDIBBits[tmp+1],lpDIBBits[tmp]));
				if(tmp>=total)
					break;
				tmp+=3;
			}
		}

	}	

}*/



void CCloudView::CreatBitmap(CBitmap *bmp, int width, int height)
{		
	CDC* dc=GetDC();
	bmp->CreateCompatibleBitmap(dc,width,height);
 	ReleaseDC(dc);
}