o Boolean operation function package
gdaCAD_boolean package is an external package for Boolean operation on gdsCAD.core.Boundary objects. It returns only one function “boolean()”.
o Text polygon functions package
gdaCAD_text package is an external package for turning texts (utf-8) into polygon objects in forms of gdaCAD.core.Boundary. It returns two functions “text_hrzt()” and “text_vtcl()”.