mirror of
https://github.com/smallmain/cocos-enhance-kit.git
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133 lines
3.7 KiB
C++
133 lines
3.7 KiB
C++
/****************************************************************************
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Copyright (c) 2010-2012 cocos2d-x.org
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Copyright (c) 2013-2016 Chukong Technologies Inc.
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Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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http://www.cocos2d-x.org
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#ifndef __ccRandom_H_
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#define __ccRandom_H_
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#include <random>
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#include <cstdlib>
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#include "base/ccMacros.h"
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/**
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* @addtogroup base
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* @{
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*/
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NS_CC_BEGIN
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/**
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* @class RandomHelper
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* @brief A helper class for creating random number.
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*/
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class CC_DLL RandomHelper {
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public:
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template<typename T>
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static inline T random_real(T min, T max) {
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std::uniform_real_distribution<T> dist(min, max);
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auto &mt = RandomHelper::getEngine();
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return dist(mt);
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}
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template<typename T>
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static inline T random_int(T min, T max) {
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std::uniform_int_distribution<T> dist(min, max);
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auto &mt = RandomHelper::getEngine();
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return dist(mt);
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}
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private:
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static inline std::mt19937 &getEngine() {
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static std::random_device seed_gen;
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static std::mt19937 engine(seed_gen());
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return engine;
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}
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};
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/**
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* Returns a random value between `min` and `max`.
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*/
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template<typename T>
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inline T random(T min, T max) {
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return RandomHelper::random_int<T>(min, max);
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}
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template<>
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inline float random(float min, float max) {
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return RandomHelper::random_real(min, max);
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}
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template<>
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inline long double random(long double min, long double max) {
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return RandomHelper::random_real(min, max);
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}
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template<>
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inline double random(double min, double max) {
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return RandomHelper::random_real(min, max);
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}
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/**
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* Returns a random int between 0 and RAND_MAX.
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*/
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inline int random() {
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return cocos2d::random(0, RAND_MAX);
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};
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/**
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* Returns a random float between -1 and 1.
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* It can be seeded using std::srand(seed);
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*/
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inline float rand_minus1_1() {
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// IDEA: using the new c++11 random engine generator
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// without a proper way to set a seed is not useful.
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// Resorting to the old random method since it can
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// be seeded using std::srand()
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return ((std::rand() / (float)RAND_MAX) * 2) -1;
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// return cocos2d::random(-1.f, 1.f);
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};
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/**
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* Returns a random float between 0 and 1.
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* It can be seeded using std::srand(seed);
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*/
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inline float rand_0_1() {
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// IDEA: using the new c++11 random engine generator
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// without a proper way to set a seed is not useful.
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// Resorting to the old random method since it can
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// be seeded using std::srand()
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return std::rand() / (float)RAND_MAX;
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// return cocos2d::random(0.f, 1.f);
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};
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NS_CC_END
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// end group
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/// @}
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#endif //__ccRandom_H_
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