Last change
on this file since 336 was
286,
checked in by Maciej Komosinski, 10 years ago
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Updated headers
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Property svn:eol-style set to
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File size:
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1 | // This file is a part of Framsticks SDK. http://www.framsticks.com/ |
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2 | // Copyright (C) 1999-2015 Maciej Komosinski and Szymon Ulatowski. |
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3 | // See LICENSE.txt for details. |
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4 | |
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5 | #include "rndutil.h" |
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6 | #include <common/nonstd_math.h> |
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7 | #include <cstdint> |
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8 | #include <stdlib.h> |
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9 | |
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10 | unsigned short pseudornd(short x) |
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11 | { |
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12 | static int32_t seed = 0; |
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13 | int32_t y; |
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14 | if (x <= 0) { seed = -x; return 0; } |
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15 | seed = (y = (3677 * seed + 3680) & 0x7fffffff) - 1; |
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16 | 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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17 | } |
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18 | |
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19 | double CustomRnd(double *tab) |
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20 | { |
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21 | double *range = tab + 1 + 2 * randomN((int)(0.5 + tab[0])); |
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22 | return range[0] + rnd0N(range[1] - range[0]); |
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23 | } |
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24 | |
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25 | double RandomGener::Uni(double begin, double end) |
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26 | { |
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27 | return begin + rnd01*(end - begin); |
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28 | } |
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29 | |
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30 | double RandomGener::GaussStd() |
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31 | { |
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32 | if (isNextGauss) { isNextGauss = 0; return nextGauss; } |
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33 | double v1, v2, s; |
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34 | do { |
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35 | v1 = 2 * rnd01 - 1; //-1..1 |
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36 | v2 = 2 * rnd01 - 1; //-1..1 |
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37 | s = v1*v1 + v2*v2; |
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38 | } while (s >= 1); |
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39 | double mult = sqrt(-2 * log(s) / s); |
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40 | nextGauss = v2*mult; |
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41 | isNextGauss = 1; |
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42 | return v1*mult; |
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43 | } |
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44 | |
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45 | double RandomGener::Gauss(double m, double s) |
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46 | { |
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47 | return m + s*GaussStd(); |
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48 | } |
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49 | |
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50 | RandomGener RndGen; |
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