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

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3 Mar 20037 min read 424.3K   13.9K   126  
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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Written By
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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