Last change
on this file since 132 was
121,
checked in by sz, 11 years ago
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updated file headers and makefiles
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-
Property svn:eol-style set to
native
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File size:
1.3 KB
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[121] | 1 | // This file is a part of the Framsticks GDK. |
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| 2 | // Copyright (C) 2002-2014 Maciej Komosinski and Szymon Ulatowski. See LICENSE.txt for details. |
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| 3 | // Refer to http://www.framsticks.com/ for further information. |
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| 4 | |
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[109] | 5 | #include "rndutil.h" |
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| 6 | #include <common/nonstd_math.h> |
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| 7 | #include <stdlib.h> |
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| 8 | |
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| 9 | unsigned short pseudornd(short x) |
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| 10 | { |
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| 11 | static long seed=0; |
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| 12 | long y; |
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| 13 | if (x<=0) {seed=-x; return 0;} |
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| 14 | seed=(y=(3677*seed+3680)&0x7fffffff)-1; |
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| 15 | return (unsigned short)(((unsigned short)y)%(x));//rzutowanie y->unsigned short to pewnie blad bo zmniejsza wartosc ktorej sie potem robi modulo, ale pseudornd sluzy chyba tylko do generowania randomowych world map? i modulo i tak jest tam bardzo male, lepiej niczego nie zmieniac bo po co maja pliki z ustawieniami zmienic swoje przypadkowe znaczenie |
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| 16 | } |
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| 17 | |
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| 18 | double CustomRnd(double *tab) |
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| 19 | { |
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| 20 | double *range=tab+1+2*randomN((int)(0.5+tab[0])); |
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| 21 | return range[0]+rnd0N(range[1]-range[0]); |
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[112] | 22 | } |
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[109] | 23 | |
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| 24 | double RandomGener::Uni(double begin, double end) |
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| 25 | { |
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| 26 | return begin+rnd01*(end-begin); |
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| 27 | } |
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| 28 | |
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| 29 | double RandomGener::GaussStd() |
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| 30 | { |
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| 31 | if (isNextGauss) {isNextGauss=0; return nextGauss;} |
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| 32 | double v1,v2,s; |
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| 33 | do { |
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| 34 | v1=2*rnd01-1; //-1..1 |
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| 35 | v2=2*rnd01-1; //-1..1 |
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| 36 | s=v1*v1+v2*v2; |
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| 37 | } while (s>=1); |
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| 38 | double mult=sqrt(-2*log(s)/s); |
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| 39 | nextGauss=v2*mult; |
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| 40 | isNextGauss=1; |
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| 41 | return v1*mult; |
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| 42 | } |
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| 43 | |
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| 44 | double RandomGener::Gauss(double m,double s) |
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| 45 | {return m+s*GaussStd();} |
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| 46 | |
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| 47 | RandomGener RndGen; |
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