椭圆扫描 Bresenham算法 VC++

// MytestView.cpp : implementation of the CMytestView class
//

#include "stdafx.h"
#include "Mytest.h"
#include "math.h"

#include "MytestDoc.h"
#include "MytestView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMytestView

IMPLEMENT_DYNCREATE(CMytestView, CView)

BEGIN_MESSAGE_MAP(CMytestView, CView)
	//{{AFX_MSG_MAP(CMytestView)
	ON_COMMAND(ID_MENU_ZXSM, OnMenuZxsm)
	ON_COMMAND(ID_MENU_YDSM, OnMenuYdsm)
	ON_COMMAND(ID_MENU_TYSM, OnMenuTysm)
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CMytestView construction/destruction

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

}

CMytestView::~CMytestView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CMytestView drawing

void CMytestView::OnDraw(CDC* pDC)
{
	CMytestDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CMytestView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CMytestView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CMytestView message handlers

void CMytestView::OnMenuZxsm() 
{
	// TODO: Add your command handler code here
	
}

void SetPixel8(CDC *pDC,int x,int y,COLORREF c)
{
	pDC->SetPixel(x,y,c);
	pDC->SetPixel(y,x,c);

	pDC->SetPixel(-x,y,c);
	pDC->SetPixel(y,-x,c);

	pDC->SetPixel(-x,-y,c);
	pDC->SetPixel(-y,-x,c);

	pDC->SetPixel(x,-y,c);
	pDC->SetPixel(-y,x,c);

}

void SetPixel4(CDC *pDC,int x,int y,COLORREF c)
{
	pDC->SetPixel(x,y,c);
	pDC->SetPixel(-x,y,c);

	pDC->SetPixel(-x,-y,c);
	pDC->SetPixel(x,-y,c);

}

void CMytestView::OnMenuYdsm() 
{
	// TODO: Add your command handler code here
	CDC *pDC;
	pDC=GetDC();

	CRect rect;
	GetClientRect(&rect);
	pDC->SetMapMode(MM_ANISOTROPIC);
	pDC->SetWindowExt(rect.Width(),rect.Height());
	pDC->SetViewportExt(rect.Width(),-rect.Height());
	pDC->SetViewportOrg(rect.Width()/2,rect.Height()/2);

	int r=100,x,y;
	double d;
	SetPixel8(pDC,0,r,RGB(0,0,255));
	d=1.25-r;

	for(x=0,y=r;x<=y;x++){
		if(d>=0) 
			y--;
		if(d>=0) 
			d=d+2*(x-y)+5;
		else
			d=d+2*x+3;
		
	 SetPixel8(pDC,x+1,y,RGB(0,0,255));

	}
	
}

void CMytestView::OnMenuTysm() 
{
	// TODO: Add your command handler code here

	CDC *pDC;
	pDC=GetDC();

	CRect rect;
	GetClientRect(&rect);
	pDC->SetMapMode(MM_ANISOTROPIC);
	pDC->SetWindowExt(rect.Width(),rect.Height());
	pDC->SetViewportExt(rect.Width(),-rect.Height());
	pDC->SetViewportOrg(rect.Width()/2,rect.Height()/2);

	int a=200,b=100,x,y;
	double d;

	SetPixel4(pDC,0,b,RGB(0,0,255));
	d=b*b+a*a*(-b+0.25);
	for(x=0,y=b;x<=a*a/sqrt(a*a+b*b);x++){
		if(d>=0) 
			y--;
		if(d>=0) 
			d=d+b*b*(2*x+3)+a*a*(-2*y+2);
		else
			d=d+b*b*(2*x+3);
		
	 SetPixel4(pDC,x+1,y,RGB(0,0,255));
	}

	SetPixel4(pDC,a*a/sqrt(a*a+b*b),b*b/sqrt(a*a+b*b),RGB(0,0,255));
	d=b*b*(x+0.5)*(x+0.5)+a*a*(y-1)*(y-1)-a*a*b*b;
	for(x=a*a/sqrt(a*a+b*b),y=b*b/sqrt(a*a+b*b);y>0;y--){
		if(d<=0) 
			x++;
		if(d>=0) 
			d=d+a*a*(-2*y+3);
		else	
			d=d+b*b*(2*x+2)+a*a*(-2*y+3);
		
	 SetPixel4(pDC,x,y-1,RGB(0,0,255));
	 
	}		
}