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A C++ implementation of Douglas-Peucker Line Approximation Algorithm

, 3 Mar 2003
DP Line approximation algorithm is a well-known method to approximate 2D lines. It is quite fast, O(nlog_2(n)) for a n-points line and can drastically compress a data curve. Here, a fully OOP implementation is given.
// GLDouglasView.h : interface of the CGLDouglasView class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_GLDOUGLASVIEW_H__7E30539D_64BE_4A12_BF53_ABF1BD3CCECD__INCLUDED_)
#define AFX_GLDOUGLASVIEW_H__7E30539D_64BE_4A12_BF53_ABF1BD3CCECD__INCLUDED_

#include "viewGL2D.h"	// Added by ClassView
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000


class CGLDouglasView : public CView
{
protected: // create from serialization only
	CGLDouglasView();
	DECLARE_DYNCREATE(CGLDouglasView)

// Attributes
public:
	CGLDouglasDoc* GetDocument();

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CGLDouglasView)
	public:
	virtual void OnDraw(CDC* pDC);  // overridden to draw this view
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
	virtual void OnInitialUpdate();
	//}}AFX_VIRTUAL

// Implementation
public:
	virtual ~CGLDouglasView();
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;
#endif

protected:

// Generated message map functions
protected:
	CViewGL2D m_view;
	CWGL m_wgl;
	//{{AFX_MSG(CGLDouglasView)
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
	afx_msg void OnSize(UINT nType, int cx, int cy);
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

#ifndef _DEBUG  // debug version in GLDouglasView.cpp
inline CGLDouglasDoc* CGLDouglasView::GetDocument()
   { return (CGLDouglasDoc*)m_pDocument; }
#endif

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_GLDOUGLASVIEW_H__7E30539D_64BE_4A12_BF53_ABF1BD3CCECD__INCLUDED_)

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About the Author

Jonathan de Halleux
Engineer
United States United States
Jonathan de Halleux is Civil Engineer in Applied Mathematics. He finished his PhD in 2004 in the rainy country of Belgium. After 2 years in the Common Language Runtime (i.e. .net), he is now working at Microsoft Research on Pex (http://research.microsoft.com/pex).

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