paint2view.cpp

Bresenham直线生成算法,初始华起点和终点后就可以画出直线了

// paint2View.cpp : implementation of the CPaint2View class
//

#include "stdafx.h"
#include "paint2.h"

#include "paint2Doc.h"
#include "paint2View.h"

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

/////////////////////////////////////////////////////////////////////////////
// CPaint2View

IMPLEMENT_DYNCREATE(CPaint2View, CView)

BEGIN_MESSAGE_MAP(CPaint2View, CView)
	//{{AFX_MSG_MAP(CPaint2View)
		// 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()

/////////////////////////////////////////////////////////////////////////////
// CPaint2View construction/destruction

CPaint2View::CPaint2View()
{
	// TODO: add construction code here

}

CPaint2View::~CPaint2View()
{
}

BOOL CPaint2View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}



/////////////////////////////////////////////////////////////////////////////
// CPaint2View drawing

void CPaint2View::OnDraw(CDC* pDC)
{
	CPaint2Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	
	int x0=5,y0=5,x1=100,y1=100;
	int dx,dy,e,i,x,y;
	dx=x1-x0;
	dy=y1-y0;
	e=2*dy-dx;	x=x0;
	y=y0;
    for(i=0;i<=dx;i++)
	{pDC->SetPixel(x,y,RGB(255,0,0));	 x++;
	 e=e+2*dy;
	 if(e>=0)
	 {y++;
	  e=e-2*dx;
}
	}
	// TODO: add draw code for native data here
}

/////////////////////////////////////////////////////////////////////////////
// CPaint2View printing

BOOL CPaint2View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CPaint2View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CPaint2View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CPaint2View diagnostics

#ifdef _DEBUG
void CPaint2View::AssertValid() const
{
	CView::AssertValid();
}

void CPaint2View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CPaint2Doc* CPaint2View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CPaint2Doc)));
	return (CPaint2Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CPaint2View message handlers