+ /// removes also all sub-sketch elements
+ SKETCHPLUGIN_EXPORT virtual void erase();
+
+ /// appends a feature to the sketch sub-elements container
+ SKETCHPLUGIN_EXPORT virtual std::shared_ptr<ModelAPI_Feature> addFeature(std::string theID);
+
+ /// Just to synchronise the container of sub-features
+ virtual void removeFeature(std::shared_ptr<ModelAPI_Feature> theFeature);
+
+ /// Returns the number of sub-elements
+ SKETCHPLUGIN_EXPORT virtual int numberOfSubs() const;
+
+ /// Returns the sub-feature by zero-base index
+ SKETCHPLUGIN_EXPORT virtual std::shared_ptr<ModelAPI_Feature>
+ subFeature(const int theIndex) const;
+
+ /// Returns the sub-feature unique identifier in this composite feature by zero-base index
+ SKETCHPLUGIN_EXPORT virtual int subFeatureId(const int theIndex) const;
+
+ /// Returns true if feature or reuslt belong to this composite feature as subs
+ SKETCHPLUGIN_EXPORT virtual bool isSub(ObjectPtr theObject) const;
+
+ /// Construction result is allways recomuted on the fly
+ SKETCHPLUGIN_EXPORT virtual bool isPersistentResult() {return false;}
+
+ /// Returns the point projected into the sketch plane
+ std::shared_ptr<GeomAPI_Pnt2d> to2D(const std::shared_ptr<GeomAPI_Pnt>& thePnt);
+
+ SKETCHPLUGIN_EXPORT virtual void attributeChanged(const std::string& theID);
+protected: