mirror of
https://github.com/glest/glest-source.git
synced 2025-09-26 15:39:21 +02:00
47 lines
921 B
C++
47 lines
921 B
C++
#include "random.h"
|
|
|
|
#include <cassert>
|
|
|
|
#include "leak_dumper.h"
|
|
|
|
namespace Shared{ namespace Util{
|
|
|
|
// =====================================================
|
|
// class Random
|
|
// =====================================================
|
|
|
|
const int Random::m= 714025;
|
|
const int Random::a= 1366;
|
|
const int Random::b= 150889;
|
|
|
|
Random::Random(){
|
|
lastNumber= 0;
|
|
}
|
|
|
|
void Random::init(int seed){
|
|
lastNumber= seed % m;
|
|
}
|
|
|
|
int Random::rand(){
|
|
lastNumber= (a*lastNumber + b) % m;
|
|
return lastNumber;
|
|
}
|
|
|
|
int Random::randRange(int min, int max){
|
|
assert(min<=max);
|
|
int diff= max-min;
|
|
int res= min + static_cast<int>(static_cast<float>(diff+1)*Random::rand() / m);
|
|
assert(res>=min && res<=max);
|
|
return res;
|
|
}
|
|
|
|
float Random::randRange(float min, float max){
|
|
assert(min<=max);
|
|
float rand01= static_cast<float>(Random::rand())/(m-1);
|
|
float res= min+(max-min)*rand01;
|
|
assert(res>=min && res<=max);
|
|
return res;
|
|
}
|
|
|
|
}}//end namespace
|