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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.
// 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
	CGLDouglasDoc();
	DECLARE_DYNCREATE(CGLDouglasDoc)

// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CGLDouglasDoc)
	public:
	virtual BOOL OnNewDocument();
	virtual void Serialize(CArchive& ar);
	//}}AFX_VIRTUAL

// Implementation
public:
	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;
#endif

protected:

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

	//{{AFX_MSG(CGLDouglasDoc)
		// NOTE - the ClassWizard will add and remove member functions here.
		//    DO NOT EDIT what you see in these blocks of generated code !
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

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

//{{AFX_INSERT_LOCATION}}
// 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
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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