Last change
on this file since 154 was
154,
checked in by sz, 11 years ago
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reformatting, english translation
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Property svn:eol-style set to
native
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File size:
1.4 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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[154] | 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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[109] | 16 | } |
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| 17 | |
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| 18 | double CustomRnd(double *tab) |
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| 19 | { |
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[154] | 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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[154] | 26 | return begin + rnd01*(end - begin); |
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[109] | 27 | } |
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| 28 | |
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| 29 | double RandomGener::GaussStd() |
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| 30 | { |
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[154] | 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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[109] | 42 | } |
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| 43 | |
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[154] | 44 | double RandomGener::Gauss(double m, double s) |
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| 45 | { |
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| 46 | return m + s*GaussStd(); |
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| 47 | } |
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[109] | 48 | |
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| 49 | RandomGener RndGen; |
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