/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2010 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLCore/src/SampledLine.cpp                            **
** Module : ICLCore                                                **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** Commercial License                                              **
** ICL can be used commercially, please refer to our website       **
** www.iclcv.org for more details.                                 **
**                                                                 **
** GNU General Public License Usage                                **
** Alternatively, this file may be used under the terms of the     **
** GNU General Public License version 3.0 as published by the      **
** Free Software Foundation and appearing in the file LICENSE.GPL  **
** included in the packaging of this file.  Please review the      **
** following information to ensure the GNU General Public License  **
** version 3.0 requirements will be met:                           **
** http://www.gnu.org/copyleft/gpl.html.                           **
**                                                                 **
** 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.                                          **
**                                                                 **
*********************************************************************/

#include <ICLCore/SampledLine.h>
#include <ICLCore/LineSampler.h>
namespace icl{

  static int estimate_buf_size(int aX, int aY, int bX, int bY){
    return iclMax(abs(aX-bX),abs(aY-bY))+1; //+1 even though a==b -> we have a sigle point!
  }

  void SampledLine::init(int aX, int aY, int bX, int bY){
    int n = estimate_buf_size(aX,aY,bX,bY);
    if(n>0){
      m_bufBegin = new Point[n];
      m_bufEnd = m_bufBegin+n;
      LineSampler::init(aX,aY,bX,bY,m_bufBegin,n);
      LineSampler::getPointers(&m_cur,&m_end);
    }else{
      m_bufBegin = m_bufEnd = 0;
    }
  }
  void SampledLine::init(int aX, int aY, int bX, int bY, int minX, int minY, int maxX, int maxY){
    int n = estimate_buf_size(aX,aY,bX,bY);
    if(n){
      m_bufBegin = new Point[n];
      m_bufEnd = m_bufBegin+n;
      LineSampler::init(aX,aY,bX,bY,minX,minY,maxX,maxY,m_bufBegin,n);
      LineSampler::getPointers(&m_cur,&m_end);
    }else{
      m_bufBegin = m_bufEnd = 0;
    }

  }

  SampledLine &SampledLine::operator=(const SampledLine &other){
    if(other.isNull()){
      ICL_DELETE_ARRAY(m_bufBegin);
      m_cur = m_end = 0;
    }else{
      if(other.getBufferSize() != getBufferSize()){
        ICL_DELETE_ARRAY(m_bufBegin);
        int n = other.getBufferSize();
        m_bufBegin = new Point[n];
        m_bufEnd = m_bufBegin+n;
      }
      m_cur = m_bufBegin + other.getBufferOffset();
      m_end = m_cur + other.remaining();
      std::copy(other.m_bufBegin,other.m_bufEnd,m_bufBegin);
    }
    return *this;
  }
}