/// Returns true is sketch element is under the rigid constraint
SKETCHPLUGIN_EXPORT virtual bool isFixed();
/// Returns true is sketch element is under the rigid constraint
SKETCHPLUGIN_EXPORT virtual bool isFixed();
/// Called on change of any argument-attribute of this object
SKETCHPLUGIN_EXPORT virtual void attributeChanged(const std::string& theID);
/// Called on change of any argument-attribute of this object
SKETCHPLUGIN_EXPORT virtual void attributeChanged(const std::string& theID);