00001 /* 00002 Copyright (c) 2010, The Barbarian Group 00003 All rights reserved. 00004 00005 Redistribution and use in source and binary forms, with or without modification, are permitted provided that 00006 the following conditions are met: 00007 00008 * Redistributions of source code must retain the above copyright notice, this list of conditions and 00009 the following disclaimer. 00010 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and 00011 the following disclaimer in the documentation and/or other materials provided with the distribution. 00012 00013 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED 00014 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00015 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR 00016 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 00017 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 00018 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00019 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 00020 POSSIBILITY OF SUCH DAMAGE. 00021 */ 00022 00023 #pragma once 00024 00025 #include <boost/random.hpp> 00026 #include <boost/random/uniform_int.hpp> 00027 #include <boost/random/uniform_real.hpp> 00028 #include <boost/random/mersenne_twister.hpp> 00029 00030 #include "cinder/Vector.h" 00031 00032 namespace cinder { 00033 00034 class Rand { 00035 public: 00036 Rand() 00037 : mBase( 214u ), mFloatGen( mBase, boost::uniform_real<float>( 0.0f, 1.0f ) ), mIntGen( mBase, boost::uniform_int<>( 0, 2147483647 ) ) 00038 {} 00039 00040 Rand( uint32_t seed ) 00041 : mBase( seed ), mFloatGen( mBase, boost::uniform_real<float>( 0.0f, 1.0f ) ), mIntGen( mBase, boost::uniform_int<>( 0, 2147483647 ) ) 00042 {} 00043 00045 bool nextBool() 00046 { 00047 return mIntGen() & 1; 00048 } 00049 00051 int32_t nextInt() 00052 { 00053 return mIntGen(); 00054 } 00055 00057 int32_t nextInt( int32_t v ) 00058 { 00059 return mIntGen() % v; 00060 } 00061 00063 int32_t nextInt( int32_t a, int32_t b ) 00064 { 00065 return nextInt( b - a ) + a; 00066 } 00067 00069 float nextFloat() 00070 { 00071 return mFloatGen(); 00072 } 00073 00075 float nextFloat( float v ) 00076 { 00077 return mFloatGen() * v; 00078 } 00079 00081 float nextFloat( float a, float b ) 00082 { 00083 return mFloatGen() * ( b - a ) + a; 00084 } 00085 00087 float posNegFloat( float a, float b ) 00088 { 00089 if( nextBool() ) 00090 return nextFloat( a, b ); 00091 else 00092 return -nextFloat( a, b ); 00093 } 00094 00096 Vec3f nextVec3f() 00097 { 00098 float phi = nextFloat( (float)M_PI * 2.0f ); 00099 float costheta = nextFloat( -1.0f, 1.0f ); 00100 00101 float rho = math<float>::sqrt( 1.0f - costheta * costheta ); 00102 float x = rho * math<float>::cos( phi ); 00103 float y = rho * math<float>::sin( phi ); 00104 float z = costheta; 00105 00106 return Vec3f( x, y, z ); 00107 } 00108 00110 Vec2f nextVec2f( ) 00111 { 00112 float theta = nextFloat( (float)M_PI * 2.0f ); 00113 return Vec2f( math<float>::cos( theta ), math<float>::sin( theta ) ); 00114 } 00115 00116 // STATICS 00118 static void randomize(); 00119 00121 static bool randBool() 00122 { 00123 return sIntGen() & 1; 00124 } 00125 00127 static int32_t randInt() 00128 { 00129 return sIntGen(); 00130 } 00131 00133 static int32_t randInt( int32_t v ) 00134 { 00135 if( v == 0 ) return 0; 00136 else return sIntGen() % v; 00137 } 00138 00140 static int32_t randInt( int32_t a, int32_t b ) 00141 { 00142 return randInt( b - a ) + a; 00143 } 00144 00146 static float randFloat() 00147 { 00148 return sFloatGen(); 00149 } 00150 00152 static float randFloat( float v ) 00153 { 00154 return sFloatGen() * v; 00155 } 00156 00158 static float randFloat( float a, float b ) 00159 { 00160 return sFloatGen() * ( b - a ) + a; 00161 } 00162 00164 static float randPosNegFloat( float a, float b ) 00165 { 00166 if( randBool() ) 00167 return randFloat( a, b ); 00168 else 00169 return -randFloat( a, b ); 00170 } 00171 00173 static Vec3f randVec3f() 00174 { 00175 float phi = randFloat( (float)M_PI * 2.0f ); 00176 float costheta = randFloat( -1.0f, 1.0f ); 00177 00178 float rho = math<float>::sqrt( 1.0f - costheta * costheta ); 00179 float x = rho * math<float>::cos( phi ); 00180 float y = rho * math<float>::sin( phi ); 00181 float z = costheta; 00182 00183 return Vec3f( x, y, z ); 00184 } 00185 00187 static Vec2f randVec2f() 00188 { 00189 float theta = randFloat( (float)M_PI * 2.0f ); 00190 return Vec2f( math<float>::cos( theta ), math<float>::sin( theta ) ); 00191 } 00192 00193 private: 00194 boost::mt19937 mBase; 00195 boost::variate_generator<boost::mt19937&, boost::uniform_real<float> > mFloatGen; 00196 boost::variate_generator<boost::mt19937&, boost::uniform_int<> > mIntGen; 00197 00198 static boost::mt19937 sBase; 00199 static boost::variate_generator<boost::mt19937&, boost::uniform_real<float> > sFloatGen; 00200 static boost::variate_generator<boost::mt19937&, boost::uniform_int<> > sIntGen; 00201 }; 00202 00203 } // namespace cinder