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

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3 Mar 20037 min read 422.8K   13.8K   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.
// ToolBarShrink.h: interface for the CToolBarPlayer class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_TOOLBARSHRINK_H__11521262_3856_41ED_A399_D1AC38093863__INCLUDED_)
#define AFX_TOOLBARSHRINK_H__11521262_3856_41ED_A399_D1AC38093863__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "ToolbarEx.h"

class CToolBarShrink : public CToolBarEx  
{
public:
	CToolBarShrink();
	~CToolBarShrink();

	void Create();
	void Update(double dShrinkRatio);
	void SetMainFrame( CFrameWnd* pFrame)	{	m_pFrame = pFrame;};

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CToolBarEx)
	//}}AFX_VIRTUAL

protected:
	//{{AFX_MSG(CToolBarShrink)
	afx_msg void OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar);
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
	DECLARE_DYNCREATE(CToolBarShrink)
protected:
	double m_dShrinkRatio;
	CSliderCtrl* m_pShrinkSlider;
	CFrameWnd* m_pFrame;
};

#endif // !defined(AFX_TOOLBARPLAYER_H__11521262_3856_41ED_A399_D1AC38093863__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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