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/******************************************************************************
 *       __    _    _   _       _       _   _____                             *
 *       | \  / |  | | | |     | |     | |  | ___|                            *
 *       |  \/  |  | | | |     | |     | |  | |_                              *
 *       |      |  | | | |     | |     | |  |  _|                             *
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 *       |_|  |_|  |_| |____|  |____|  |_|  |____|                            *
 * __________________________________________________________________________ *
 *                 Multifunctional Library For Image Processing               *
 *                                                                            *
 *                                                                            *
 *                                                                            *
 *      (c) Copyright 2007 by Humbert Florent                                 *
 *                                                                            *
 *      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; only version 2 of the License.          *
 *                                                                            *
 *      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.                                                      *
 ******************************************************************************/

#include "operator/GeometricOperators.hpp"

#include <cmath>

using namespace Millie;

void Millie::rotationOperator(Image& out, Image & in, float degree)
{
  if(out.getNumComponents() != in.getNumComponents())
    throw IllegalArgument("rotationOperator");

  /* détermine la valeur en radian de l'angle*/
  float angle_radian = -degree * M_PI / 180.0;

  /*pour éviter pleins d'appel, on stocke les valeurs*/
  float tcos = cos(angle_radian);
  float tsin = sin(angle_radian);

  /*calcul de la taille de l'image de destination*/
  int largeurdest= (int)  ceil(in.getWidth() * fabs(tcos) + in.getHeight()* fabs(tsin));
  int hauteurdest= (int)  ceil(in.getWidth()* fabs(tsin) + in.getHeight() * fabs(tcos));

  /*on redimensionne l'image*/
  out.resize(largeurdest, hauteurdest);

  /*calcul du centre des images*/
  int mxdest = out.getWidth()/2;
  int mydest = out.getHeight()/2;
  int mx = in.getWidth()/2;
  int my = in.getHeight()/2;

  for(int canal=0; canal<in.getNumComponents(); canal++)
    for(int j=0;j< out.getHeight();j++)
      for(int i=0;i< out.getWidth();i++)
      {
        /* on détermine la valeur de pixel qui correspond le mieux pour la position
         * i,j de la surface de destination */

        /* on détermine la meilleure position sur la surface d'origine en appliquant
         * une matrice de rotation inverse
         */

        int bx = (int) (ceil (tcos * (i-mxdest) + tsin * (j-mydest) + mx));
        int by = (int) (ceil (-tsin * (i-mxdest) + tcos * (j-mydest) + my));
        /* on vérifie que l'on ne sort pas des bords*/
        if (bx>=0 && bx< in.getWidth() && by>=0 && by< in.getHeight())
        {
          out.setPixel(i,j, canal, in.getPixel(bx, by, canal));
        }
      }
}

void Millie::verticalFlipOperator(Image& out, const Image& in)
{
  /*on vérifie que out et in ont le même nombre de canaux
   * sinon, l'opération n'a aucun sens, on lance une exception
   */
  if(out.getNumComponents() != in.getNumComponents())
    throw IllegalArgument("verticalFlipOperator");

  /*
   * on redéfini la taille de l'image de sortie
   */
  out.resize(in.getWidth(), in.getHeight());

  int largeur = out.getWidth();
  int hauteur = out.getHeight();

  /* on parcout tous les canaux et on effectue l'opération de flip*/
  for(int canal=0; canal< out.getNumComponents(); canal++)
    for(int j = 0; j< hauteur; j++)
      for(int i = 0; i< largeur; i++)
       out.setPixel(i,hauteur-j, canal, in.getPixel(i,j, canal));

}


void Millie::horizontalFlipOperator(Image& out, const Image& in)
{
  if(out.getNumComponents() != in.getNumComponents())
    throw IllegalArgument("horizontalFlipOperator");

  out.resize(in.getWidth(), in.getHeight());

  int largeur = out.getWidth();
  int hauteur = out.getHeight();

  for(int canal=0; canal< out.getNumComponents(); canal++)
    for(int j = 0; j< hauteur; j++)
      for(int i = 0; i< largeur; i++)
        out.setPixel(largeur- i,j, canal, in.getPixel(i,j, canal));

}

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