sanjiaowangview.cpp

用中点画圆法画一个圆

// sanjiaowangView.cpp : implementation of the CSanjiaowangView class
//

#include "stdafx.h"
#include "sanjiaowang.h"

#include "sanjiaowangDoc.h"
#include "sanjiaowangView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CSanjiaowangView

IMPLEMENT_DYNCREATE(CSanjiaowangView, CView)

BEGIN_MESSAGE_MAP(CSanjiaowangView, CView)
	//{{AFX_MSG_MAP(CSanjiaowangView)
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CSanjiaowangView construction/destruction

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

}

CSanjiaowangView::~CSanjiaowangView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CSanjiaowangView drawing

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

/////////////////////////////////////////////////////////////////////////////
// CSanjiaowangView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CSanjiaowangView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CSanjiaowangView message handlers

void CSanjiaowangView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
    m_start=point;
	CView::OnLButtonDown(nFlags, point);
}

void CSanjiaowangView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CDC* pDC=GetDC();
  int xc=m_start.x ,yc=m_start.y ,r=5,c=0;
  int x,y;
  float d;
  x=0; y=r; d=1.25-r;
  pDC->SetPixel ((xc+x),(yc+y),c);
  pDC->SetPixel ((xc-x),(yc+y),c);
  pDC->SetPixel ((xc+x),(yc-y),c);
  pDC->SetPixel ((xc-x),(yc-y),c);
  pDC->SetPixel ((xc+y),(yc+x),c);
  pDC->SetPixel ((xc-y),(yc+x),c);
  pDC->SetPixel ((xc+y),(yc-x),c);
  pDC->SetPixel ((xc-y),(yc-x),c);
  while(x<=y)
  { if(d<0) 	d+=2*x+3;
   else   { d+=2*(x-y)+5; y--;}
   x++;
  pDC->SetPixel ((xc+x),(yc+y),c);
  pDC->SetPixel ((xc-x),(yc+y),c);
  pDC->SetPixel ((xc+x),(yc-y),c);
  pDC->SetPixel ((xc-x),(yc-y),c);
  pDC->SetPixel ((xc+y),(yc+x),c);
  pDC->SetPixel ((xc-y),(yc+x),c);
  pDC->SetPixel ((xc+y),(yc-x),c);
  pDC->SetPixel ((xc-y),(yc-x),c);
  }

	CView::OnLButtonUp(nFlags, point);
}