text: /*
  
  Copyright (c) 2005-2021, University of Oxford.
  All rights reserved.
  
  University of Oxford means the Chancellor, Masters and Scholars of the
  University of Oxford, having an administrative office at Wellington
  Square, Oxford OX1 2JD, UK.
  
  This file is part of Chaste.
  
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:
   * Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.
   * Redistributions in binary form must reproduce the above copyright notice,
     this list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
   * Neither the name of the University of Oxford nor the names of its
     contributors may be used to endorse or promote products derived from this
     software without specific prior written permission.
  
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  */
  
  #include "DifferentialAdhesionGeneralisedLinearSpringForce.hpp"
  #include "CellLabel.hpp"
  
  template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
  DifferentialAdhesionGeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::DifferentialAdhesionGeneralisedLinearSpringForce()
     : GeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>(),
       mHomotypicLabelledSpringConstantMultiplier(1.0),
       mHeterotypicSpringConstantMultiplier(1.0)
  {
  }
  
  template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
  double DifferentialAdhesionGeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::VariableSpringConstantMultiplicationFactor(
      unsigned nodeAGlobalIndex,
      unsigned nodeBGlobalIndex,
      AbstractCellPopulation<ELEMENT_DIM, SPACE_DIM>& rCellPopulation,
      bool isCloserThanRestLength)
  {
  
      if (isCloserThanRestLength)
      {
          return 1.0;
      }
      else
      {
          // Determine which (if any) of the cells corresponding to these nodes are labelled
          CellPtr p_cell_A = rCellPopulation.GetCellUsingLocationIndex(nodeAGlobalIndex);
          bool cell_A_is_labelled = p_cell_A->template HasCellProperty<CellLabel>();
  
          CellPtr p_cell_B = rCellPopulation.GetCellUsingLocationIndex(nodeBGlobalIndex);
          bool cell_B_is_labelled = p_cell_B->template HasCellProperty<CellLabel>();
  
          // For heterotypic interactions, scale the spring constant by mHeterotypicSpringConstantMultiplier
          if (cell_A_is_labelled != cell_B_is_labelled)
          {
              return mHeterotypicSpringConstantMultiplier;
          }
          else
          {
              // For homotypic interactions between labelled cells, scale the spring constant by mHomotypicLabelledSpringConstantMultiplier
              if (cell_A_is_labelled)
              {
                  return mHomotypicLabelledSpringConstantMultiplier;
              }
              else
              {
                  // For homotypic interactions between unlabelled cells, leave the spring constant unchanged from its normal value
                  return 1.0;
              }
          }
      }
  }
  
  template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
  double DifferentialAdhesionGeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::GetHomotypicLabelledSpringConstantMultiplier()
  {
      return mHomotypicLabelledSpringConstantMultiplier;
  }
  
  template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
  void DifferentialAdhesionGeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::SetHomotypicLabelledSpringConstantMultiplier(double labelledSpringConstantMultiplier)
  {
      assert(labelledSpringConstantMultiplier > 0.0);
      mHomotypicLabelledSpringConstantMultiplier = labelledSpringConstantMultiplier;
  }
  
  template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
  double DifferentialAdhesionGeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::GetHeterotypicSpringConstantMultiplier()
  {
      return mHeterotypicSpringConstantMultiplier;
  }
  
  template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
  void DifferentialAdhesionGeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::SetHeterotypicSpringConstantMultiplier(double heterotypicSpringConstantMultiplier)
  {
      assert(heterotypicSpringConstantMultiplier > 0.0);
      mHeterotypicSpringConstantMultiplier = heterotypicSpringConstantMultiplier;
  }
  
  template<unsigned ELEMENT_DIM, unsigned SPACE_DIM>
  void DifferentialAdhesionGeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::OutputForceParameters(out_stream& rParamsFile)
  {
      *rParamsFile << "\t\t\t<HomotypicLabelledSpringConstantMultiplier>" << mHomotypicLabelledSpringConstantMultiplier << "</HomotypicLabelledSpringConstantMultiplier>\n";
      *rParamsFile << "\t\t\t<HeterotypicSpringConstantMultiplier>" << mHeterotypicSpringConstantMultiplier << "</HeterotypicSpringConstantMultiplier>\n";
  
      // Call direct parent class
      GeneralisedLinearSpringForce<ELEMENT_DIM, SPACE_DIM>::OutputForceParameters(rParamsFile);
  }
  
  // Explicit instantiation
  template class DifferentialAdhesionGeneralisedLinearSpringForce<1,1>;
  template class DifferentialAdhesionGeneralisedLinearSpringForce<1,2>;
  template class DifferentialAdhesionGeneralisedLinearSpringForce<2,2>;
  template class DifferentialAdhesionGeneralisedLinearSpringForce<1,3>;
  template class DifferentialAdhesionGeneralisedLinearSpringForce<2,3>;
  template class DifferentialAdhesionGeneralisedLinearSpringForce<3,3>;
  
  // Serialization for Boost >= 1.36
  #include "SerializationExportWrapperForCpp.hpp"
  EXPORT_TEMPLATE_CLASS_ALL_DIMS(DifferentialAdhesionGeneralisedLinearSpringForce)
  