ParticleEmitter.h

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/*
     ██╗  ██╗  █████╗  ████████╗  █████╗  ███╗   ██╗  █████╗
     ██║ ██╔╝ ██╔══██╗ ╚══██╔══╝ ██╔══██╗ ████╗  ██║ ██╔══██╗
     █████╔╝  ███████║    ██║    ███████║ ██╔██╗ ██║ ███████║
     ██╔═██╗  ██╔══██║    ██║    ██╔══██║ ██║╚██╗██║ ██╔══██║
     ██║  ██╗ ██║  ██║    ██║    ██║  ██║ ██║ ╚████║ ██║  ██║
     ╚═╝  ╚═╝ ╚═╝  ╚═╝/\  ╚═╝    ╚═╝  ╚═╝ ╚═╝  ╚═══╝ ╚═╝  ╚═╝
   /vvvvvvvvvvvvvvvvvvv \=========================================,
   `^^^^^^^^^^^^^^^^^^^ /---------------------------------------"
        Katana Engine \/ © 2012 - Shuriken Studios LLC
                http://www.shurikenstudios.com
*/
 
#pragma once
 
#include "KatanaEngine.h"
 
namespace KatanaEngine
{
 
    class ParticleEmitter
    {
 
    public:
 
        ParticleEmitter(IParticleInitializer *pInitializer)
        {
            m_pInitializer = pInitializer;
        }
 
        virtual ~ParticleEmitter() { delete m_pInitializer; }
 
 
        virtual void Emit(const float amount, const GameTime& gameTime)
        {
            const float fCount = amount * m_maxParticlesPerSecond * (float)gameTime.GetElapsedTime();
            float iCount = (int)fCount;
            m_remainingParticles += fCount - iCount;
 
            while (iCount)
            {
                IParticle *pParticle = m_pPool->GetInactiveParticle();
                if (!pParticle) {
                    m_remainingParticles += iCount;
                    return;
                }
 
                m_pInitializer->Initialize(pParticle, m_position);
                iCount--;
            }
        }
 
        virtual void SetMaxParticlesPerSecond(const int max) { m_maxParticlesPerSecond = max; }
 
        virtual void SetParticlePool(ParticlePool *pPool) { m_pPool = pPool; }
 
        virtual void SetPosition(const Vector2 &position) { m_position = position; }
 
    private:
 
        Vector2 m_position;
 
        int m_maxParticlesPerSecond = 100;
 
        float m_remainingParticles = 0;
 
        ParticlePool *m_pPool = nullptr;
 
        IParticleInitializer *m_pInitializer = nullptr;
 
    };
 
}