Randomizer.cpp
1 //
3 // SFML - Simple and Fast Multimedia Library
4 // Copyright (C) 2007-2009 Laurent Gomila (laurent.gom@gmail.com)
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24 
26 // Headers
28 #include <SFML/System/Randomizer.hpp>
29 #include <stdlib.h>
30 #include <time.h>
31 
32 
33 namespace
34 {
35  // Set the random numbers sequence seed with the current system time, so that it is always different
36  unsigned int SetRandomSeed()
37  {
38  unsigned int Seed = static_cast<unsigned int>(time(NULL));
39  srand(Seed);
40  return Seed;
41  }
42 }
43 
44 
45 namespace sf
46 {
48 // Static member variables
50 unsigned int Randomizer::ourSeed = SetRandomSeed();
51 
52 
57 void Randomizer::SetSeed(unsigned int Seed)
58 {
59  srand(Seed);
60  ourSeed = Seed;
61 }
62 
63 
67 unsigned int Randomizer::GetSeed()
68 {
69  return ourSeed;
70 }
71 
72 
76 float Randomizer::Random(float Begin, float End)
77 {
78  // This is not the best algorithm, but it is fast and will be enough in most cases
79  // (see Google for best approaches)
80 
81  return static_cast<float>(rand()) / RAND_MAX * (End - Begin) + Begin;
82 }
83 
84 
88 int Randomizer::Random(int Begin, int End)
89 {
90  // This is not the best algorithm, but it is fast and will be enough in most cases
91  // (see Google for best approaches)
92 
93  return rand() % (End - Begin + 1) + Begin;
94 }
95 
96 } // namespace sf
static void SetSeed(unsigned int Seed)
Set the seed for the generator.
Definition: Randomizer.cpp:57
static unsigned int GetSeed()
Get the seed used to generate random numbers the generator.
Definition: Randomizer.cpp:67
static float Random(float Begin, float End)
Get a random float number in a given range.
Definition: Randomizer.cpp:76