Emitters.hpp

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//
// Thor C++ Library
// Copyright (c) 2011-2015 Jan Haller
// 
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
// 
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
// 
// 1. The origin of this software must not be misrepresented; you must not
//    claim that you wrote the original software. If you use this software
//    in a product, an acknowledgment in the product documentation would be
//    appreciated but is not required.
// 
// 2. Altered source versions must be plainly marked as such, and must not be
//    misrepresented as being the original software.
// 
// 3. This notice may not be removed or altered from any source distribution.
//


#ifndef THOR_EMITTER_HPP
#define THOR_EMITTER_HPP

#include <Thor/Math/Distribution.hpp>
#include <Thor/Config.hpp>

#include <SFML/System/Time.hpp>
#include <SFML/System/Vector2.hpp>
#include <SFML/Graphics/Color.hpp>


namespace thor
{

class EmissionInterface;



template <typename Emitter>
std::function<void(EmissionInterface&, sf::Time)> refEmitter(Emitter& referenced)
{
    return [&referenced] (EmissionInterface& system, sf::Time dt)
    {
        return referenced(system, dt);
    };
}


class THOR_API UniversalEmitter
{
    // ---------------------------------------------------------------------------------------------------------------------------
    // Public member functions
    public:
                                    UniversalEmitter();

        void                        operator() (EmissionInterface& system, sf::Time dt);

        void                        setEmissionRate(float particlesPerSecond);

        void                        setParticleLifetime(Distribution<sf::Time> particleLifetime);

        void                        setParticlePosition(Distribution<sf::Vector2f> particlePosition);

        void                        setParticleVelocity(Distribution<sf::Vector2f> particleVelocity);

        void                        setParticleRotation(Distribution<float> particleRotation);

        void                        setParticleRotationSpeed(Distribution<float> particleRotationSpeed);

        void                        setParticleScale(Distribution<sf::Vector2f> particleScale);

        void                        setParticleColor(Distribution<sf::Color> particleColor);

        void                        setParticleTextureIndex(Distribution<unsigned int> particleTextureIndex);


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private member functions
    private:
        // Returns the number of particles to emit during this frame.
        std::size_t                 computeParticleCount(sf::Time dt);


    // ---------------------------------------------------------------------------------------------------------------------------
    // Private variables
    private:
        float                       mEmissionRate;
        float                       mEmissionDifference;

        Distribution<sf::Time>      mParticleLifetime;
        Distribution<sf::Vector2f>  mParticlePosition;
        Distribution<sf::Vector2f>  mParticleVelocity;
        Distribution<float>         mParticleRotation;
        Distribution<float>         mParticleRotationSpeed;
        Distribution<sf::Vector2f>  mParticleScale;
        Distribution<sf::Color>     mParticleColor;
        Distribution<unsigned int>  mParticleTextureIndex;
};


} // namespace thor

#endif // THOR_EMITTER_HPP