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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.
// CustomizeDialog.h: interface for the CCustomizeDialog class.
// Copyright (c) 2001 by Nikolay Denisov. All rights reserved.
// This code is free for personal and commercial use, providing this 
// notice remains intact in the source files and all eventual changes are
// clearly marked with comments.
// You must obtain the author's consent before you can include this code
// in a software library.
// No warrantee of any kind, express or implied, is included with this
// software; use at your own risk, responsibility for damages (if any) to
// anyone resulting from the use of this software rests entirely with the
// user.
// Please email bug reports, bug fixes, enhancements, requests and
// comments to:


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

enum TextOptions
    toNone          = -1,
    toTextLabels    =  0,
    toTextOnRight   =  1,
    toNoTextLabels  =  2,

enum IconOptions
    ioNone          = -1,
    ioSmallIcons    =  0,
    ioLargeIcons    =  1,

// Customize dialog
#define IDD_CUSTOMIZE                   0x7900

// Customize dialog controls
#define IDC_CB_TEXTOPTIONS              1000
#define IDC_CB_ICONOPTIONS              1001

class CToolBarEx;

// CCustomizeDialog dialog

class CCustomizeDialog : public CWnd
    DECLARE_DYNAMIC( CCustomizeDialog );

// Construction
    CCustomizeDialog( CToolBarEx* pToolBar,
                      TextOptions eTextOptions,
                      IconOptions eIconOptions );

// Operations
    void SetTextOptions( TextOptions eTextOptions);
    void SetIconOptions( IconOptions eIconOptions);
    TextOptions  GetTextOptions() { return m_eTextOptions; }
    IconOptions GetIconOptions() { return m_eIconOptions; }

// Overrides
    // ClassWizard generated virtual function overrides
	virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);

// Implementation
// Implementation data
    CToolBarEx*     m_pToolBar;

// Generated message map functions
	CComboBox m_wndIconOptions;
	CComboBox m_wndTextOptions;
	CStatic m_wndIconOptionsText;
	CStatic m_wndTextOptionsText;
    TextOptions m_eTextOptions;
    IconOptions m_eIconOptions;

    afx_msg void OnTextOptions();
    afx_msg void OnIconOptions();
    LRESULT OnInitDialog( WPARAM wParam, LPARAM lParam );

#endif  // !__CUSTOMIZEDIALOG_H__

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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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