bmpdemoview.cpp

vc++程序设计与技巧中第8章“图形图像编程”部分的VC++原代码

// BMPDemoView.cpp : implementation of the CBMPDemoView class
//

#include "stdafx.h"
#include "BMPDemo.h"

#include "BMPDemoDoc.h"
#include "BMPDemoView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CBMPDemoView

IMPLEMENT_DYNCREATE(CBMPDemoView, CView)

BEGIN_MESSAGE_MAP(CBMPDemoView, CView)
	//{{AFX_MSG_MAP(CBMPDemoView)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CBMPDemoView construction/destruction

CBMPDemoView::CBMPDemoView()
{
	// TODO: add construction code here

}

CBMPDemoView::~CBMPDemoView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CBMPDemoView drawing

void CBMPDemoView::OnDraw(CDC* pDC)
{
	CBMPDemoDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	//显示位图资源
	CClientDC  dc(this);
	CBitmap bitmap1;
    CBitmap* pOldBitmap1;
    CDC MemDC1;
	//建立与显示设备兼容的内存设备场境
    MemDC1.CreateCompatibleDC(&dc); 
    bitmap1.LoadBitmap(IDB_BITMAPTEST); //取出位图资源
	//将位图选入内存场境
    pOldBitmap1=MemDC1.SelectObject(&bitmap1); 
    dc.BitBlt(10,50,100,100,&MemDC1,0,0,SRCCOPY); //显示位图
	dc.TextOut(10,150,"显示位图资源");
    MemDC1.SelectObject(pOldBitmap1);

	//创建位图，在其中绘制图形并显示
	CBitmap bitmap2;
    CBitmap* pOldBitmap2;
    CDC MemDC2;
    int i;
    CPen pen;
    CPen* oldpen;
	//建立与显示设备兼容的内存设备场境
    MemDC2.CreateCompatibleDC(pDC);
	//建立与显示设备兼容的位图
    bitmap2.CreateCompatibleBitmap(pDC,100,100);
	//将位图选入内存场境
    pOldBitmap2=MemDC2.SelectObject(&bitmap2); 
    for(i=0;i<100;i++)
    { 
	   //画100根线
       pen.CreatePen(PS_SOLID,1, RGB(0,0,i*2+55));    
       oldpen=MemDC2.SelectObject(&pen);
       MemDC2.MoveTo(0,i);
       MemDC2.LineTo(100,i);
       MemDC2.SelectObject(oldpen);
       pen.DeleteObject();
    }
    pDC->BitBlt(130,50,100,100,&MemDC2,0,0,SRCCOPY);//显示位图
	pDC->TextOut(120,150,"创建位图并显示");
    MemDC2.SelectObject(pOldBitmap2);

	//显示外部的BMP文件
	HBITMAP bitmap;
    //读取位图文件SAMPLE.BMP
    bitmap=(HBITMAP)LoadImage(AfxGetInstanceHandle(),"SAMPLE.BMP",IMAGE_BITMAP,0,0,LR_LOADFROMFILE|LR_CREATEDIBSECTION);
    ASSERT(bitmap);
    HBITMAP OldBitmap;
    CDC MemDC3;
    CRect rect;
    MemDC3.CreateCompatibleDC(pDC);
    GetClientRect(rect);
    OldBitmap=(HBITMAP)MemDC3.SelectObject(bitmap);
    //显示位图
    pDC->BitBlt(240, 50,rect.Width()-20,rect.Height()-20,&MemDC3,0,0,SRCCOPY);
	pDC->TextOut(250,150,"显示外部BMP文件");
    MemDC3.SelectObject(OldBitmap);

}

/////////////////////////////////////////////////////////////////////////////
// CBMPDemoView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CBMPDemoView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CBMPDemoView message handlers