2D图形编程

开发平台：
Visual C++

XDAView.cpp：源码内容
							// XDAView.cpp : implementation of the CXDAView class
//
#include "stdafx.h"
#include "XDA.h"
#include "XDADoc.h"
#include "XDAView.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CXDAView
IMPLEMENT_DYNCREATE(CXDAView, CView)
BEGIN_MESSAGE_MAP(CXDAView, CView)
	//{{AFX_MSG_MAP(CXDAView)
		// 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()
/////////////////////////////////////////////////////////////////////////////
// CXDAView construction/destruction
CXDAView::CXDAView()
{
	// TODO: add construction code here
}
CXDAView::~CXDAView()
{
}
BOOL CXDAView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs
	return CView::PreCreateWindow(cs);
}
/////////////////////////////////////////////////////////////////////////////
// CXDAView drawing
void CXDAView::OnDraw(CDC* pDC)
{
	CXDADoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
int dx;
	int dy;
	int x;
	int y;
	int p;
	int const1;
	int const2;
	int inc;
	int tmp;
	int i;
	int k;
	int t;
	dx=pDoc->x2-pDoc->x1;
	dy=pDoc->y2-pDoc->y1;
	if(dx*dy>=0)
		inc=1;
	else inc=-1;
	if(abs(dx)>abs(dy)){
		if(dx<0){
			tmp=pDoc->x1;
			pDoc->x1=pDoc->x2;
		pDoc->x2=tmp;
			tmp=pDoc->y1;
			pDoc->y1=pDoc->y2;
			pDoc->y2=tmp;
			dx=-dx;
			dy=-dy;
		}
		p=2*dy-dx;
		const1=2*dy;
		const2=2*(dy-dx);
		x=pDoc->x1;
		y=pDoc->y1;
	
		pDC->SetPixel(x,y,pDoc->c);
				while(x<pDoc->x2){
			x++;
			if(p<0)
				p+=const1;
			else{
				y+=inc;
				
				p+=const2;
			}k=y+5;
		if(x%10!=0)
			for(t=y;t<k;t++)
			pDC->SetPixel(x,t,pDoc->c);
		}
	}
	else{
		if(dy<0){
			tmp=pDoc->x1;
		pDoc->x1=pDoc->x2;
		pDoc->x2=tmp;
			tmp=pDoc->y1;
		pDoc->y1=pDoc->y2;
	pDoc->y2=tmp;
			dx=-dx;
			dy=-dy;
		}
		p=2*dx-dy;
		const1=2*dx;
		const2=2*(dx-dy);
		x=pDoc->x1;
        y=pDoc->y1;
		pDC->SetPixel(x,y,pDoc->c);
		while(y<pDoc->y2){
			y++;
		
			if(p<0)
				p+=const1;
			else{
				x+=inc;
				p+=const2;
			}k=y+5;
				if(x%10!=0)
			for(t=y;t<k;t++)
			pDC->SetPixel(x,t,pDoc->c);
		
		}
	}
}
/////////////////////////////////////////////////////////////////////////////
// CXDAView printing
BOOL CXDAView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}
void CXDAView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}
void CXDAView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}
/////////////////////////////////////////////////////////////////////////////
// CXDAView diagnostics
#ifdef _DEBUG
void CXDAView::AssertValid() const
{
	CView::AssertValid();
}
void CXDAView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}
CXDADoc* CXDAView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CXDADoc)));
	return (CXDADoc*)m_pDocument;
}
#endif //_DEBUG
/////////////////////////////////////////////////////////////////////////////
// CXDAView message handlers

						