text: /*=========================================================================
   *
   *  Copyright UMC Utrecht and contributors
   *
   *  Licensed under the Apache License, Version 2.0 (the "License");
   *  you may not use this file except in compliance with the License.
   *  You may obtain a copy of the License at
   *
   *        http://www.apache.org/licenses/LICENSE-2.0.txt
   *
   *  Unless required by applicable law or agreed to in writing, software
   *  distributed under the License is distributed on an "AS IS" BASIS,
   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   *  See the License for the specific language governing permissions and
   *  limitations under the License.
   *
   *=========================================================================*/
  
  #ifndef elxBSplineInterpolatorFloat_hxx
  #define elxBSplineInterpolatorFloat_hxx
  
  #include "elxBSplineInterpolatorFloat.h"
  
  namespace elastix
  {
  
  /**
   * ***************** BeforeEachResolution ***********************
   */
  
  template <class TElastix>
  void
  BSplineInterpolatorFloat<TElastix>::BeforeEachResolution()
  {
    /** Get the current resolution level. */
    unsigned int level = (this->m_Registration->GetAsITKBaseType())->GetCurrentLevel();
  
    /** Read the desired spline order from the parameter file. */
    unsigned int splineOrder = 1;
    this->GetConfiguration()->ReadParameter(
      splineOrder, "BSplineInterpolationOrder", this->GetComponentLabel(), level, 0);
  
    /** Check. */
    if (splineOrder == 0)
    {
      xl::xout["warning"] << "WARNING: the BSplineInterpolationOrder is set to 0.\n"
                          << "         It is not possible to take derivatives with this setting.\n"
                          << "         Make sure you use a derivative free optimizer." << std::endl;
    }
  
    /** Set the splineOrder. */
    this->SetSplineOrder(splineOrder);
  
  } // end BeforeEachResolution()
  
  
  } // end namespace elastix
  
  #endif // end #ifndef elxBSplineInterpolatorFloat_hxx
  