85 lines
4.9 KiB
C++
85 lines
4.9 KiB
C++
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#pragma warning( disable: 4001 4201 4214 4514 )
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#include <windows.h> // needed for ULONG and CriticalSection support
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#pragma warning( disable: 4001 4201 4214 4514 )
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/////////////////////////////////////////////////////////////////////////////
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// //
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// randpeak.h -- Exported interface for randpeak.c //
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// //
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// While this header is targeted for Win32, the code //
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// in randpeak.c is portable provided the following: //
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// //
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// ULONG is an unsigned 32-bit data type //
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// and BOOL is an integral boolean type //
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// //
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// Two's complement wraparound (mod 2^32) //
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// occurs on addition and multiplication //
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// where result is greater than (2^32-1) //
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// //
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// If _MT or MULTITHREADED is defined, the //
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// definition and support of critical //
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// section primitives: //
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// //
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// CRITICAL_SECTION data type //
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// InitializeCriticalSection function //
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// EnterCriticalSection function //
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// LeaveCriticalSection function //
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// //
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// Author: Tom McGuire (tommcg), 03/29/94 //
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// //
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// (C) Copyright 1994, Microsoft Corporation //
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// //
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/////////////////////////////////////////////////////////////////////////////
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#if ( defined( _MT ) && ! defined( MULTITHREADED ))
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#define MULTITHREADED 1 // compile multi-threaded support
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#endif
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ULONG BitReverse32( ULONG ulNumber ); // 31:0 -> 0:31
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void SeedRandom32( ULONG ulSeed ); // must call first, non-reentrant
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ULONG Random32( void ); // linear distribution 0<n<2^32-1
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ULONG RandomInRange( ULONG ulMinInclusive, // Random32() mod Range
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ULONG ulMaxInclusive );
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ULONG RandomPeaked( ULONG ulMaxInclusive,
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ULONG ulPeakFrequency,
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ULONG ulPeakWidth,
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ULONG ulPeakDensity,
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ULONG ulPeakDecay );
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/////////////////////////////////////////////////////////////////////////////
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// //
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// | Peaked Distribution | //
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// |_ | //
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// | \ | //
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// | \ _ | //
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// | \ / \ _ | //
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// | \ / \ / \ _ | //
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// | \ / \ / \ / \ _| //
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// | \_____/ \________/ \__ __/ \____________/ | //
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// |_______________________________________________________________| //
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// 0 P 2P nP Max //
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// //
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// The center of each peak occurs at ulPeakFreq intervals starting //
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// from zero, and the tops of the peaks are linear-distributed across //
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// ulPeakWidth (ie, +/- ulPeakWidth/2). ulPeakDensity controls the //
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// slope of the distribution off each peak with higher numbers causing //
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// steeper slopes (and hence wider, lower valleys). ulPeakDecay //
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// controls the declining peak-to-peak slope with higher numbers //
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// causing higher peaks near zero and lower peaks toward ulMax. //
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// Note that ulPeakDensity and ulPeakDecay are computationally //
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// expensive with higher values (they represent internal iteration //
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// counts), so moderate numbers such as 3-5 for ulPeakDensity and //
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// 1-2 for ulPeakDecay are recommended. //
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// //
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/////////////////////////////////////////////////////////////////////////////
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