clip_a_lineview.cpp

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// Clip_a_lineView.cpp : implementation of the CClip_a_lineView class
//

#include "stdafx.h"
#include "Clip_a_line.h"

#include "Clip_a_lineDoc.h"
#include "Clip_a_lineView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CClip_a_lineView

IMPLEMENT_DYNCREATE(CClip_a_lineView, CView)

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

/////////////////////////////////////////////////////////////////////////////
// CClip_a_lineView construction/destruction

CClip_a_lineView::CClip_a_lineView()
{
	// TODO: add construction code here
	x1=10;
	y1=10;
	x2=800;
	y2=400;
	xw_min=50;
	xw_max=300;
	yw_min=50;
	yw_max=300;
}

CClip_a_lineView::~CClip_a_lineView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CClip_a_lineView drawing

void CClip_a_lineView::OnDraw(CDC* pDC)
{
	CClip_a_lineDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	clip_a_line(pDC, x1, y1,x2, y2, xw_min,xw_max,yw_min,yw_max);
}

/////////////////////////////////////////////////////////////////////////////
// CClip_a_lineView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CClip_a_lineView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CClip_a_lineView message handlers

void CClip_a_lineView::clip_a_line(CDC *pDC, int x1, int y1, int x2, int y2, int xw_min, int xw_max, int yw_min, int yw_max)
{
	int i,code1[4],code2[4],done,display;
	float m;
	int x11,x22,y11,y22,mark;
	done=0;
	display=0;
	while(done==0)
	{
		x11=x1;
		x22=x2;
		y11=y1;
		y22=y2;
		encode(x1,y1,code1,xw_min,xw_max,yw_min,yw_max);
		encode(x2,y2,code2,xw_min,xw_max,yw_min,yw_max);
		if(accept(code1,code2))
		{
			done=1;
			display=1;
			break;
		}
		else
			if(reject(code1,code2))
			{
				done=1;
				break;
			}
		mark=swap_if_needed(code1,code2);
		if(mark==1)
		{
			x1=x22;
			x2=x11;
			y1=y22;
			y2=y11;
		}
		if(x2==x1)
			m=999999;
		else
			m=(float)(y2-y1)/(float)(x2-x1);
		if(code1[0])
		{
			x1+=(yw_min-y1)/m;
			y1=yw_min;
		}
		else if(code1[1])
		{
			x1-=(y1-yw_max)/m;
			y1=yw_max;
		}
		else if(code1[2])
		{
			y1-=(x1-xw_min)*m;
			x1=xw_min;
		}
		else if(code1[3])
		{
			y1+=(xw_max-x1)*m;
			x1=xw_max;
		}
	}
	if(display==1)
	{
		pDC->MoveTo(x1,y1);
		pDC->LineTo(x2,y2);
	}
	pDC->MoveTo(xw_min,yw_max);
	pDC->LineTo(xw_max,yw_max);
	pDC->MoveTo(xw_min,yw_min);
	pDC->LineTo(xw_min,yw_max);
	pDC->MoveTo(xw_min,yw_min);
	pDC->LineTo(xw_max,yw_min);
	pDC->MoveTo(xw_max,yw_min);
	pDC->LineTo(xw_max,yw_max);
}

void CClip_a_lineView::encode(int x, int y, int code[], int xw_min, int xw_max, int yw_min, int yw_max)
{
	int i;
	for(i=0;i<4;i++)
		code[i]=0;
	if(x<xw_min)
		code[2]=1;
	else if(x>xw_max)
		code[3]=1;
	if(y>yw_max)
		code[1]=1;
	else if(y<yw_min)
		code[0]=1;
}

int CClip_a_lineView::accept(int code1[], int code2[])
{
	int i,flag;
	flag=1;
	for(i=0;i<4;i++)
	{
		if((code1[i]==1)||(code2[i]==1))
		{
			flag=0;
			break;
		}
	}
	return (flag);
}

int CClip_a_lineView::reject(int code1[], int code2[])
{
	int i,flag;
	flag=0;
	for(i=0;i<4;i++)
	{
		if((code1[i]==1)&&(code2[i]==1))
		{
			flag=1;
			break;
		}
	}
	return (flag);
}

int CClip_a_lineView::swap_if_needed(int code1[], int code2[])
{
	int i,flag1,flag2,tmp;
	flag1=1;
	for(i=0;i<4;i++)
		if(code1[i]==1)
		{
			flag1=0;
			break;
		}
		flag2=1;
		for(i=0;i<4;i++)
			if(code2[i]==1)
			{
				flag2=0;
				break;
			}
			if((flag1==0)&&(flag2==0))
				return (0);
			if((flag1==1)&&(flag2==0))
			{
				for(i=0;i<4;i++)
				{
					tmp=code1[i];
					code1[i]=code2[i];
					code2[i]=tmp;
				}
				return (1);
			}
			return (0);
}