Particle.h

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/*
     ██╗  ██╗  █████╗  ████████╗  █████╗  ███╗   ██╗  █████╗
     ██║ ██╔╝ ██╔══██╗ ╚══██╔══╝ ██╔══██╗ ████╗  ██║ ██╔══██╗
     █████╔╝  ███████║    ██║    ███████║ ██╔██╗ ██║ ███████║
     ██╔═██╗  ██╔══██║    ██║    ██╔══██║ ██║╚██╗██║ ██╔══██║
     ██║  ██╗ ██║  ██║    ██║    ██║  ██║ ██║ ╚████║ ██║  ██║
     ╚═╝  ╚═╝ ╚═╝  ╚═╝/\  ╚═╝    ╚═╝  ╚═╝ ╚═╝  ╚═══╝ ╚═╝  ╚═╝
   /vvvvvvvvvvvvvvvvvvv \=========================================,
   `^^^^^^^^^^^^^^^^^^^ /---------------------------------------"
        Katana Engine \/ © 2012 - Shuriken Studios LLC
                http://www.shurikenstudios.com
*/
 
#pragma once
 
#include "KatanaEngine.h"
 
namespace KatanaEngine
{
 
    class Particle : public IParticle
    {
 
    public:
 
        Particle() { }
        virtual ~Particle() { }
 
        virtual bool IsActive() const { return m_lifeRemaining > 0; }
 
        virtual Vector2 GetPosition() const { return m_position; }
 
        virtual Vector2 GetVelocity() const { return m_velocity; }
 
        virtual Color GetColor() const { return m_color; }
 
        virtual float GetScale() const { return m_scale; }
 
        virtual float GetLifeSpan() const { return m_lifeSpan; }
 
        virtual float GetLifeRemaining() const { return m_lifeRemaining; }
 
        virtual void SetPosition(const Vector2 position) { m_position = position; }
 
        virtual void SetVelocity(const Vector2 velocity) { m_velocity = velocity; }
 
        virtual void SetColor(const Color color) { m_color = color; }
 
        virtual void SetScale(const float scale) { m_scale = scale; }
 
        virtual void SetLifeSpan(const float lifeSpan) {
            m_lifeSpan = lifeSpan;
        }
 
        virtual float GetLifePercentage() const { return m_lifePercentage; }
 
        virtual void Initialize(Vector2& position) {
            m_position = position;
            m_lifeRemaining = m_lifeSpan;
        }
 
        virtual void Update(const GameTime& gameTime)
        {
            const float elapsed = (float)gameTime.GetElapsedTime();
            m_lifeRemaining -= elapsed;
            if (m_lifeRemaining < 0) m_lifeRemaining = 0;
            m_lifePercentage = m_lifeRemaining / m_lifeSpan;
            m_position += m_velocity * elapsed;
        }
 
 
    private:
 
        Vector2 m_position;
        Vector2 m_velocity;
        Color m_color = Color::White;
        float m_scale = 1;
        
        float m_lifeSpan = 0;
        float m_lifeRemaining = 0;
        float m_lifePercentage = 0;
    };
 
}