ex_gdiview.cpp

计算机图形学电子教案 上传者来自 兰州交通大学

// Ex_GDIView.cpp : implementation of the CEx_GDIView class
//

#include "stdafx.h"
#include "Ex_GDI.h"

#include "Ex_GDIDoc.h"
#include "Ex_GDIView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CEx_GDIView

IMPLEMENT_DYNCREATE(CEx_GDIView, CView)

BEGIN_MESSAGE_MAP(CEx_GDIView, CView)
	//{{AFX_MSG_MAP(CEx_GDIView)
		// 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()

/////////////////////////////////////////////////////////////////////////////
// CEx_GDIView construction/destruction

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

}

CEx_GDIView::~CEx_GDIView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CEx_GDIView drawing

void CEx_GDIView::OnDraw(CDC* pDC)
{
	CEx_GDIDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	int  data[20] = {19,21,32,40,41,39,42,35,
			33,23,21,20,24,11,9,19,22,32,40,42};
			CRect	rc;
			GetClientRect(rc);// 获得客户区的大小
			rc.DeflateRect(50,50);	// 将矩形大小沿x和y方向各减小50
		int	gridXnums = 10, gridYnums = 8;
		int	dx = rc.Width()/gridXnums;
		int	dy = rc.Height()/gridYnums;
		CRect gridRect(rc.left,rc.top,rc.left+dx*gridXnums,rc.top+dy*gridYnums); // 调整矩形大小
	CPen	  gridPen(0,0,RGB(0,100,200));
		CPen*  oldPen = pDC->SelectObject(&gridPen);
		for (int i=0; i<=gridXnums; i++)			// 绘制垂直线
		{	pDC->MoveTo(gridRect.left+i*dx,gridRect.bottom);
			pDC->LineTo(gridRect.left+i*dx,gridRect.top);
		}
		for (int j=0; j<=gridYnums; j++)			// 绘制水平线
		{	pDC->MoveTo(gridRect.left,gridRect.top+j*dy);
			pDC->LineTo(gridRect.right,gridRect.top+j*dy);
		}
		pDC->SelectObject(oldPen);				// 恢复原来画笔
		gridPen.Detach();	// 将画笔对象与其构造的内容分离，以便能再次构造画笔
		gridPen.CreatePen(0,0,RGB(0,0,200));		// 重新创建画笔
		pDC->SelectObject(&gridPen);
		CBrush gridBrush(RGB(255,0,0));			// 创建画刷
		CBrush* oldBrush = pDC->SelectObject(&gridBrush);
		POINT	ptRect[4] = {{-3,-3},{-3,3},{3,3},{3,-3}}, ptDraw[4];
		int	deta;
		POINT	pt[256];
		int nCount = 20;
		deta = gridRect.Width()/nCount;
		for (i=0; i<nCount; i++)
		{	pt[i].x = gridRect.left+i*deta;
			pt[i].y = gridRect.bottom-(int)(data[i]/60.0*gridRect.Height());
			for (j=0; j<4; j++)
			{
				ptDraw[j].x = ptRect[j].x+pt[i].x;
				ptDraw[j].y = ptRect[j].y+pt[i].y;
			}
			pDC->Polygon(ptDraw,4);			// 绘制小方块
		}
		pDC->Polyline(pt,nCount);		
		// 恢复原来绘图属性
		pDC->SelectObject(oldPen);
		pDC->SelectObject(oldBrush);



}

/////////////////////////////////////////////////////////////////////////////
// CEx_GDIView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CEx_GDIView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CEx_GDIView message handlers