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isxhy posted a topic in AutoLISP, Visual LISP & DCLDear Experts, I currently obtained a building plan map with rooms, doors, stairs,etc. My task is to extract the doors and tranform it as point. The doors have been represented as a connected arc and two lines. The size of map is fairly large and there is quite a lot of arcs, and so I have to use LISP to automatically extract the arcs based on specific algorithm. My current problems is quite simple: how to loop all drawing entities and extract the type of entities that I want? I want to know the AutoCAD commands, and if your can provide the algorithm, would be very appreciated! Many thanks for your help!