FEM: Add documentation to Analysis.h

src/Mod/Fem/App/FemAnalysis.h

@@ -20,30 +20,51 @@
  *                                                                         *
  ***************************************************************************/
 
-
 #ifndef Fem_FemAnalysis_H
 #define Fem_FemAnalysis_H
 
-
 #include <App/DocumentObjectGroup.h>
 #include <App/PropertyLinks.h>
 #include <App/FeaturePython.h>
 
 
+namespace Fem {
 
-namespace Fem
-{
-
-class AppFemExport FemAnalysis : public App::DocumentObjectGroup
-{
+/**
+ * @brief Container of objects relevant to one simulation.
+ * 
+ * @details
+ *  A Analysis contains all objects nessesary for a complete specification
+ *  of a simulation. After computing it also contains the result of the
+ *  simulation. The Analysis object is just a container. It is not reponsible
+ *  for anything else like executing the simulation.
+ *
+ *  The Analysis class is essentially a App::DocumentObjectGroup. It handles
+ *  all the container stuff. The difference is that the Analysis document
+ *  object uses a different ViewProvider, has a Uid property and does some
+ *  compability handling via handleChangedPropertyName.
+ *
+ *  This implies that it is not checked which objects are put into the
+ *  Analsis object. Every document object of FreeCAD can be part of a
+ *  Analysis.
+ */
+class AppFemExport FemAnalysis : public App::DocumentObjectGroup {
     PROPERTY_HEADER(Fem::FemAnalysis);
 
 public:
-    /// Constructor
-    FemAnalysis(void);
+    /**
+     * Uses Base::Uuid to initialize the Uid property to a newly generated
+     * unique id because PropertyUUID doesn't initialize itself.
+     */
+    FemAnalysis();
     virtual ~FemAnalysis();
 
-    /// unique identifier of the Analysis
+    /**
+     * A unique identifier for each Analysis object. Useful when doing
+     * filesystem operations because it can provide a unique file or
+     * directory name for an analysis. Retains its value across save/load
+     * cycles.
+     */
     App::PropertyUUID    Uid;
 
     virtual const char* getViewProviderName() const {
@@ -51,10 +72,17 @@ public:
     }
 
 protected:
-    /// Support of backward compatibility
-    virtual void handleChangedPropertyName(Base::XMLReader &reader,
-                                           const char * TypeName,
-                                           const char *PropName);
+    /**
+     * @brief Retain compability with old "Member" property.
+     *
+     * @details
+     *  In an older version of FreeCAD FemAnalysis handles it's member itself
+     *  in a property called "Member". Now this is handled in the "Group"
+     *  property of DocumentObjectGroup. This methods translates old files
+     *  still using the "Member" property.
+     */
+    virtual void handleChangedPropertyName(
+        Base::XMLReader &reader, const char * TypeName, const char *PropName);
 };
 
 class AppFemExport DocumentObject : public App::DocumentObject