Projective4PointTransform.h

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/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLMath/src/ICLMath/Projective4PointTransform.h        **
** Module : ICLMath                                                **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** GNU LESSER GENERAL PUBLIC LICENSE                               **
** This file may be used under the terms of the GNU Lesser General **
** Public License version 3.0 as published by the                  **
**                                                                 **
** Free Software Foundation and appearing in the file LICENSE.LGPL **
** included in the packaging of this file.  Please review the      **
** following information to ensure the license requirements will   **
** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
********************************************************************/

#pragma once

#include <ICLMath/HomogeneousMath.h>
#include <ICLUtils/Point32f.h>
#include <vector>
#include <ICLUtils/Rect32f.h>
#include <ICLUtils/Rect.h>

namespace icl{
  namespace math{


          class ICLMath_API Projective4PointTransform{
      Mat3 m_Ainv; 
      Mat3 m_B;    
      Mat3 m_C;    
      utils::Point32f m_srcQuad[4], m_dstQuad[4];   


      public:

      Projective4PointTransform();

      Projective4PointTransform(const utils::Point32f srcQuad[4], const utils::Point32f dstQuad[4]);

      Projective4PointTransform(const std::vector<utils::Point32f> &srcQuad,
                                const std::vector<utils::Point32f> dstQuad);


      Projective4PointTransform(const Mat3 &C);


      void init(const utils::Point32f srcQuad[4], const utils::Point32f dstQuad[4]);


      void init(const utils::Rect32f &srcRect, const utils::Rect32f &dstRect=utils::Rect32f::null);


      void init(const utils::Rect &srcRect, const utils::Rect &dstRect=utils::Rect::null);

      const Mat3 &getAInv() const { return m_Ainv; }

      const Mat3 &getB() const { return m_B; }


      const Mat3 &getC() const { return m_C; }

      std::vector<utils::Point32f> getSrcQuad() const;

      std::vector<utils::Point32f> getDstQuad() const;

      inline utils::Point32f mapPoint(const utils::Point32f &p) const{
        Vec3 m = m_C * Vec3(p.x,p.y,1);
        const float norm = m[2] ? 1/m[2] : 1;
        return utils::Point32f(m[0]*norm,m[1]*norm);
      }

      void setSrcQuad(const utils::Point32f srcQuad[4]);

      void setDstQuad(const utils::Point32f dstQuad[4]);

      void setSrcQuad(const utils::Point32f &a, const utils::Point32f &b,
                      const utils::Point32f &c, const utils::Point32f &d);

      void setDstQuad(const utils::Point32f &a, const utils::Point32f &b,
                      const utils::Point32f &c, const utils::Point32f &d);



      std::vector<utils::Point32f> map(const std::vector<utils::Point32f> &src);

      template<class SrcForwardIterator, class DstForwardIterator>
      inline void map(SrcForwardIterator begin, SrcForwardIterator end, DstForwardIterator dst){
        while(begin != end){
          *dst++ = mapPoint(*begin++);
        }
      }

    };
  }
}