椭圆算法view.cpp

这个软件很不错

// 椭圆算法View.cpp : implementation of the CMyView class
//

#include "stdafx.h"
#include "椭圆算法.h"

#include "椭圆算法Doc.h"
#include "椭圆算法View.h"
#include <math.h>

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

/////////////////////////////////////////////////////////////////////////////
// CMyView

IMPLEMENT_DYNCREATE(CMyView, CView)

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

/////////////////////////////////////////////////////////////////////////////
// CMyView construction/destruction

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

}

CMyView::~CMyView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMyView drawing


void CMyView::OnDraw(CDC* pDC)
{
	CMyDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	int x,y,a=200,b=100,d,xp,yp,squarea,squareb;
	int color=(000,000,255);
	int x0=200,y0=150;
	squarea=a*a;squareb=b*b;
	xp=(int)(0.5+(float)squarea/sqrt((float)(squarea+squareb)));
	yp=(int)(0.5+(float)squareb/sqrt((float)(squarea+squareb)));
	x=0;
	y=b;
	d=4*(squareb-squarea*b)+squarea;
	pDC->SetPixel(x+x0,y+y0,color);
	pDC->SetPixel(-x+x0,y+y0,color);
	pDC->SetPixel(-x+x0,-y+y0,color);
	pDC->SetPixel(x+x0,-y+y0,color);

	while (x<=xp)
	{
		if (d<=0)
		{
			d+=4*squareb*(2*x+3);
		}
		else
		{
			d+=4*squareb*(2*x+3)-8*squarea*(y-1);
			y--;
		}
		x++;
		pDC->SetPixel(x+x0,y+y0,color);
		pDC->SetPixel(-x+x0,y+y0,color);
		pDC->SetPixel(-x+x0,-y+y0,color);
		pDC->SetPixel(x+x0,-y+y0,color);
	}
	x=a;
	y=0;
	d=4*(squarea-a*squareb)+squareb;
	pDC->SetPixel(x+x0,y+y0,color);
	pDC->SetPixel(-x+x0,y+y0,color);
	pDC->SetPixel(-x+x0,-y+y0,color);
	pDC->SetPixel(x+x0,-y+y0,color);
	while (y<yp)
	{
		if (d<=0)
		{
			d+=4*squarea*(2*y+3);
			
		}
		else
		{
			d+=4*squarea*(2*y+3)-8*squareb*(x-1);
			x--;
		}
		y++;
		pDC->SetPixel(x+x0,y+y0,color);
		pDC->SetPixel(-x+x0,y+y0,color);
		pDC->SetPixel(-x+x0,-y+y0,color);
		pDC->SetPixel(x+x0,-y+y0,color);
	}


}

/////////////////////////////////////////////////////////////////////////////
// CMyView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CMyView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CMyView message handlers