byangtiaoview.cpp

2次B样条曲线算法

// ByangtiaoView.cpp : implementation of the CByangtiaoView class
//

#include "stdafx.h"
#include "Byangtiao.h"

#include "ByangtiaoDoc.h"
#include "ByangtiaoView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CByangtiaoView

IMPLEMENT_DYNCREATE(CByangtiaoView, CView)

BEGIN_MESSAGE_MAP(CByangtiaoView, CView)
	//{{AFX_MSG_MAP(CByangtiaoView)
		// 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
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CByangtiaoView construction/destruction

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

}

CByangtiaoView::~CByangtiaoView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CByangtiaoView drawing

void CByangtiaoView::OnDraw(CDC* pDC)
{
	CByangtiaoDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	pDC->SetMapMode(MM_ISOTROPIC);
	pDC->SetViewportOrg(50,400);
	pDC->MoveTo(0,0);
	pDC->LineTo(2000,0);
	pDC->MoveTo(0,0);
	pDC->LineTo(0,1000);
	POINT p1,p2,p3,p4,p5,p6;

	p1.x=200,p1.y=200;
	p2.x=100,p2.y=400;
	p3.x=300,p3.y=600;
	p4.x=500,p4.y=400;
	p5.x=700,p5.y=600;
	p6.x=900,p6.y=100;
	
	pDC->MoveTo(p1);
	pDC->LineTo(p2);
	pDC->LineTo(p3);
	pDC->LineTo(p4);
	pDC->LineTo(p5);
	pDC->LineTo(p6);

	int x[]={50,p1.x,p2.x,p3.x,p4.x,p5.x,p6.x,120};
	int y[]={600,p1.y,p2.y,p3.y,p4.y,p5.y,p6.y,120};
	
	POINT p;
	 
	float t,t1,t2,a,b,c,tx,ty;
	*x=*(x+1);*y=*(y+1); 
	*(x+6+1)=*(x+6);*(y+6+1)=*(y+6); 
	t=1.0/10; 
	 
	pDC->MoveTo((*x+(*(x+1)))/2.0,(*y+(*(y+1)))/2.0); 
	for(int i=0;i<6;i++) 
	{ 
		for(int j=1;j<10;j++) 
		{ 
			t1=j*t; 
			t2=t1*t1;
			a=(t2-2*t1+1)/2.0;
			b=t1-t2+1/2.0; 
			c=t2/2.0; 
			p.x=a*(*(x+i))+b*(*(x+i+1))+c*(*(x+i+2)); 
			p.y=a*(*(y+i))+b*(*(y+i+1))+c*(*(y+i+2)); 
			pDC->LineTo(p); 
		} 
	} 

}

/////////////////////////////////////////////////////////////////////////////
// CByangtiaoView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CByangtiaoView message handlers