//==============================================================================
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Library General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//==============================================================================

//==============================================================================
// File: cParticleSystem.hpp
// Author: Jarmo Hekkanen <jarski@2ndpoint.fi>
// Copyright (c) Jarmo Hekkanen 2003 <jarski@2ndpoint.fi>
//------------------------------------------------------------------------------
#ifndef cParticleSystem_hpp
#define cParticleSystem_hpp
//------------------------------------------------------------------------------
// Includes
#include <SDL.h>
#include <vector>
//------------------------------------------------------------------------------
// Namespaces
using namespace std;
//==============================================================================

//==============================================================================
// Particle system
//------------------------------------------------------------------------------
class cParticleSystem
{
	// Constructor & Destructor
	public:
		// Constructor
		cParticleSystem (Uint16 x, Uint16 y, Uint16 maxParticles, SDL_Color a, 
						SDL_Color b, Uint16 size, Uint16 power, 
						float maxEnergy, bool regen = false);
		// Destructor
		~cParticleSystem (void);
	
	// Public methods
	public:
		// Update system
		bool Update (Uint32 deltaTime);
		// Render particles
		void Render (SDL_Surface *pScreen);
	
	// Internal structures
	private:
		struct tParticle
		{
			// Constructor (all particles are born dead)
			tParticle (void) { mEnergy = 0; };
			
			float mX;		// Particle's X coordinate
			float mY;		// Particle's Y coordinate
			float mVelX;	// Particle's X velocity
			float mVelY;	// Particle's Y velocity
			Uint32 mEnergy;	// Particle's energy
			Uint32 mMaxEnergy;	// Particle's starting energy
		};
		
	// Internal methods
	private:
		// Emit particle
		void EmitParticle (tParticle &particle);
		// Render particle
		void RenderParticle (const tParticle &particle, SDL_Surface *pScreen);
		// Update particle
		void UpdateParticle (tParticle &particle, Uint32 deltaTime);

	// Member variables
	private:

		Uint16 mX;		// System's X coordinate
		Uint16 mY;		// System's Y coordinate
		SDL_Color mStartColor;	// Start color
		SDL_Color mEndColor;	// End color
		Uint16 mSize;	// Size of the particle
		Uint16 mPower;	// Affects the starting speed
		float mMaxEnergy;	// Max energy
		bool mRegen;	// Regen particles
		vector<tParticle> mParticles;	// List of particles in this system
};
//==============================================================================

//==============================================================================
#endif // cParticleSystem_hpp
//------------------------------------------------------------------------------
// EOF
//==============================================================================