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Posted 3 Jan 2002

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.
// GLDouglasDoc.h : interface of the CGLDouglasDoc class

#if !defined(AFX_GLDOUGLASDOC_H__C4A73F41_2C97_483E_814E_8194271B9F46__INCLUDED_)
#define AFX_GLDOUGLASDOC_H__C4A73F41_2C97_483E_814E_8194271B9F46__INCLUDED_

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

class CGLDouglasDoc : public CDocument
protected: // create from serialization only

// Attributes

// Operations

// Overrides
	// ClassWizard generated virtual function overrides
	virtual BOOL OnNewDocument();
	virtual void Serialize(CArchive& ar);

// Implementation
	CDPHullGL& GetHull();
	double GetShrink() const			{	return m_dShrink;};
	void SetShrink( double dShrink)	{	m_dShrink=__min(1, __max(0, dShrink)); };
	void GetLimits(double pExt[4]);
	void Animate();
	void Draw(CWGL& wgl);
	virtual ~CGLDouglasDoc();
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;


// Generated message map functions
	long m_lCount;
	CDPHullGL m_dp;
	double m_dShrink;

		// NOTE - the ClassWizard will add and remove member functions here.
		//    DO NOT EDIT what you see in these blocks of generated code !


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

#endif // !defined(AFX_GLDOUGLASDOC_H__C4A73F41_2C97_483E_814E_8194271B9F46__INCLUDED_)

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About the Author

Jonathan de Halleux
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 (

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