Particles/Emitters.hpp
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00001 
00002 //
00003 // Thor C++ Library
00004 // Copyright (c) 2011-2015 Jan Haller
00005 // 
00006 // This software is provided 'as-is', without any express or implied
00007 // warranty. In no event will the authors be held liable for any damages
00008 // arising from the use of this software.
00009 // 
00010 // Permission is granted to anyone to use this software for any purpose,
00011 // including commercial applications, and to alter it and redistribute it
00012 // freely, subject to the following restrictions:
00013 // 
00014 // 1. The origin of this software must not be misrepresented; you must not
00015 //    claim that you wrote the original software. If you use this software
00016 //    in a product, an acknowledgment in the product documentation would be
00017 //    appreciated but is not required.
00018 // 
00019 // 2. Altered source versions must be plainly marked as such, and must not be
00020 //    misrepresented as being the original software.
00021 // 
00022 // 3. This notice may not be removed or altered from any source distribution.
00023 //
00025 
00028 
00029 #ifndef THOR_EMITTER_HPP
00030 #define THOR_EMITTER_HPP
00031 
00032 #include <Thor/Math/Distribution.hpp>
00033 #include <Thor/Config.hpp>
00034 
00035 #include <SFML/System/Time.hpp>
00036 #include <SFML/System/Vector2.hpp>
00037 #include <SFML/Graphics/Color.hpp>
00038 
00039 
00040 namespace thor
00041 {
00042 
00043 class EmissionInterface;
00044 
00045 
00048 
00065 template <typename Emitter>
00066 std::function<void(EmissionInterface&, sf::Time)> refEmitter(Emitter& referenced)
00067 {
00068     return [&referenced] (EmissionInterface& system, sf::Time dt)
00069     {
00070         return referenced(system, dt);
00071     };
00072 }
00073 
00074 
00080 class THOR_API UniversalEmitter
00081 {
00082     // ---------------------------------------------------------------------------------------------------------------------------
00083     // Public member functions
00084     public:
00087                                     UniversalEmitter();
00088 
00092         void                        operator() (EmissionInterface& system, sf::Time dt);
00093 
00097         void                        setEmissionRate(float particlesPerSecond);
00098 
00101         void                        setParticleLifetime(Distribution<sf::Time> particleLifetime);
00102 
00105         void                        setParticlePosition(Distribution<sf::Vector2f> particlePosition);
00106 
00109         void                        setParticleVelocity(Distribution<sf::Vector2f> particleVelocity);
00110 
00113         void                        setParticleRotation(Distribution<float> particleRotation);
00114 
00117         void                        setParticleRotationSpeed(Distribution<float> particleRotationSpeed);
00118 
00121         void                        setParticleScale(Distribution<sf::Vector2f> particleScale);
00122 
00125         void                        setParticleColor(Distribution<sf::Color> particleColor);
00126 
00129         void                        setParticleTextureIndex(Distribution<unsigned int> particleTextureIndex);
00130 
00131 
00132     // ---------------------------------------------------------------------------------------------------------------------------
00133     // Private member functions
00134     private:
00135         // Returns the number of particles to emit during this frame.
00136         std::size_t                 computeParticleCount(sf::Time dt);
00137 
00138 
00139     // ---------------------------------------------------------------------------------------------------------------------------
00140     // Private variables
00141     private:
00142         float                       mEmissionRate;
00143         float                       mEmissionDifference;
00144 
00145         Distribution<sf::Time>      mParticleLifetime;
00146         Distribution<sf::Vector2f>  mParticlePosition;
00147         Distribution<sf::Vector2f>  mParticleVelocity;
00148         Distribution<float>         mParticleRotation;
00149         Distribution<float>         mParticleRotationSpeed;
00150         Distribution<sf::Vector2f>  mParticleScale;
00151         Distribution<sf::Color>     mParticleColor;
00152         Distribution<unsigned int>  mParticleTextureIndex;
00153 };
00154 
00156 
00157 } // namespace thor
00158 
00159 #endif // THOR_EMITTER_HPP