/******************************************************************************
 *  Wormux is a convivial mass murder game.
 *  Copyright (C) 2001-2004 Lawrence Azzoug.
 *
 *  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 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
 ******************************************************************************
 * Sky: background of the map
 *****************************************************************************/

#include "sky.h"
#include "camera.h"
#include "map.h"
#include "maps_list.h"
#include "../graphic/surface.h"
#include "../include/app.h"

// Vitesse (comprise entre 0 et 0.5)
const Point2d SKY_SPEED( 0.3, 1);

Sky::Sky(){
}

void Sky::Init(){
 	// That is temporary -> image will be loaded directly without alpha chanel
	Surface tmp_image = ActiveMap().ReadImgSky();
	tmp_image.SetAlpha( 0, 0);
	image = tmp_image.DisplayFormat();

	tstVect = image.GetSize().inf( camera.GetSize() );
	margin = tstVect * (camera.GetSize() - image.GetSize())/2;
}

void Sky::Reset(){
	Init();
	lastPos.SetValues(INT_MAX, INT_MAX);
}

void Sky::Free(){
	image.Free();
}

void Sky::Draw()
{
  if( lastPos != camera.GetPosition() ){
	lastPos = camera.GetPosition();
	RedrawParticle(camera);
    return;
  }
  
  RedrawParticleList(*world.to_redraw_now);
  RedrawParticleList(*world.to_redraw_particles_now);
}

void Sky::RedrawParticleList(std::list<Rectanglei> &list){
  std::list<Rectanglei>::iterator it;

  for( it = list.begin(); it != list.end(); ++it )
	  RedrawParticle(*it);
}

void Sky::RedrawParticle(const Rectanglei &particle) const{
    Rectanglei ds(GetSkyPos() + particle.GetPosition() - camera.GetPosition() - margin, 
		    particle.GetSize() );
    AppWormux::GetInstance()->video.window.Blit(image, ds, particle.GetPosition() - camera.GetPosition());
}

Point2i Sky::GetSkyPos() const{
	return (Point2i(1, 1) - tstVect) * camera.GetPosition() * SKY_SPEED;
}