In this article, you will find a fast generator for Random Variable, namely normal and exponential distributions. It is based on George Marsaglia's and Wai Wan Tsang's work.
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/*
Plot Graphic Library,
a C++/MFC charting library.
Copyright (C) 2001 Jens Scheidtmann
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Contact: Jens Scheidtmann <grimaldi@users.sourceforge.net>
*/
// PGLPie.h: interface for the CPGLPie class.
//
//////////////////////////////////////////////////////////////////////
#if !defined(AFX_PGLPIE_H__8D63690A_E25F_4D15_B3C4_F7BFBDA15B34__INCLUDED_)
#define AFX_PGLPIE_H__8D63690A_E25F_4D15_B3C4_F7BFBDA15B34__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "PGLObject.h"
/*!
\ingroup PGLObjectGroup
*/
/*! \brief A Pie plot Object.
*/
class PGL_EXT_CLASS CPGLPie : public CPGLObject
{
DECLARE_SERIAL(CPGLPie);
public:
/**@name Members*/
//@{
CPGLPie();
CPGLPie(const CPGLPie& r);
/// assignment constructor
CPGLPie& operator = (const CPGLPie& r);
/// returns a pointer to a copy of the object
virtual CPGLObject* MakeCopy()
{ CPGLObject* pCopy=new CPGLPie(*this); return pCopy; };
/// destructor
virtual ~CPGLPie() {};
/** returns the extent of the datas
The array extent is filled like this :
\begin{itemize}
\item extent[0] : min(x)
\item extent[1] : __max(x)
\item extent[2] : min(y)
\item extent[3] : __max(y)
\end{itemize}
*/
virtual double* GetExtent(CPGLView* pView);
///virtual function to override in derived classes
virtual void UpdateExtent(CPGLView* pView);
/// plot using OpenGL
/// adds context menu items...
//virtual void AddContextMenuItems(CMenu* pMenu);
/// adds the line property page to the property sheet dialog.
//virtual void AddPropertyPage(CPropertySheet *pPropSheet);
/// plot to eps
virtual void PlotGfx(gfxinterface::CGfxInterface& gfx);
/// Serialize functions
void Serialize(CArchive& archive);
/// Debuggin functions
#ifdef _DEBUG
virtual void Dump( CDumpContext& dc ) const;
virtual void AssertValid() const;
#endif
//@}
protected:
};
#endif // !defined(AFX_PGLPIE_H__8D63690A_E25F_4D15_B3C4_F7BFBDA15B34__INCLUDED_)
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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).