BUG: ITKElastix issue 93 SimilarityTrans... CreateTransformParametersMap

Added `SimilarityTransformElastix<TElastix>::CreateTransformParametersMap` override, which adds the "CenterOfRotationPoint" parameter. Addresses ITKElastix issue 93: "2D similarity transform parameter map doesn't keep "CenterOfRotationPoint" parameter", by Heath Patterson, 16 December, 2020. InsightSoftwareConsortium/ITKElastix#93 Bug fixed with help from Stefan Klein and Viktor van der Valk.
SuperElastix · Dec 23, 2020 · 80716b7 · 80716b7
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commit 80716b7
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diff --git a/Components/Transforms/SimilarityTransform/elxSimilarityTransform.h b/Components/Transforms/SimilarityTransform/elxSimilarityTransform.h
@@ -136,6 +136,7 @@ class SimilarityTransformElastix
   /** Typedef's inherited from TransformBase. */
   typedef typename Superclass2::ElastixType              ElastixType;
   typedef typename Superclass2::ElastixPointer           ElastixPointer;
+  typedef typename Superclass2::ParameterMapType         ParameterMapType;
   typedef typename Superclass2::ConfigurationType        ConfigurationType;
   typedef typename Superclass2::ConfigurationPointer     ConfigurationPointer;
   typedef typename Superclass2::RegistrationType         RegistrationType;
@@ -210,6 +211,12 @@ class SimilarityTransformElastix
   void
   WriteToFile(const ParametersType & param) const override;
 
+  /** Function to create transform-parameters map.
+   * Creates the TransformParametersmap
+   */
+  void
+  CreateTransformParametersMap(const ParametersType & param, ParameterMapType * paramsMap) const override;
+
 protected:
   /** The constructor. */
   SimilarityTransformElastix();

diff --git a/Components/Transforms/SimilarityTransform/elxSimilarityTransform.hxx b/Components/Transforms/SimilarityTransform/elxSimilarityTransform.hxx
@@ -134,6 +134,24 @@ SimilarityTransformElastix<TElastix>::WriteToFile(const ParametersType & param)
 } // end WriteToFile()
 
 
+/**
+ * ************************* CreateTransformParametersMap ************************
+ */
+
+template <class TElastix>
+void
+SimilarityTransformElastix<TElastix>::CreateTransformParametersMap(const ParametersType & param,
+                                                                   ParameterMapType *     paramsMap) const
+{
+  /** Call the CreateTransformParametersMap from the TransformBase. */
+  this->Superclass2::CreateTransformParametersMap(param, paramsMap);
+
+  /** Get the center of rotation point and write it to file. */
+  paramsMap->insert({ "CenterOfRotationPoint", BaseComponent::ToVectorOfStrings(m_SimilarityTransform->GetCenter()) });
+
+} // end CreateTransformParametersMap()
+
+
 /**
  * ************************* InitializeTransform *********************
  */