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not my field of expertise but maybe Tharwat can help you with this : https://autolispprograms.wordpress.com/

@rlx Thank you. https://autolispprograms.wordpress.com/

One question: where is the area derived from?

dear Ish, I think you will be satisfied with our master lee mac program. http://www.lee-mac.com/arealabel.html

Many elite coders avoid Express Tools because some still have bugs (most easily fixed by replacing "command" calls with "command-s") in them but Help for them has been included in AutoCAD help in recent versions and I've used them since they started out as Bonus Tools. Many of them have been added as regular AutoCAD commands (most of the Layer commands for example), others have been dropped, while others around longer than Bonus Tools like Getsel.lsp and SSX.lsp are still considered Express Tools. Like Dadgad I use SYSVDLG (System Variable Editor…) and ALIASEDIT (Command Alias Editor…) on a regular basis as they provide a quick, simple, and helpful interface that eliminates simple mistakes. While some system variables are persistent, some are saved in the drawing, and some aren't saved at all when a drawing is closed environmental variables are saved in the Windows Registry where they remain unchanged. Keep in mind environmental variables saved in profiles may be different after switching profiles.

SYSVDLG just opens the Pandora's Box of all Autocad commands, and explains all available options. It is a quick trip into the belly of the System Variables Beast. I favor cursor scrolling through any area that might seem to be of interest, because then the dialog box opens, providing a very quick, on the fly review of what the variable does. Spend some down time going through it, you'll learn plenty, and be glad you did.

these websites are good for tutorials to help you understand whats going on. https://www.afralisp.net/autolisp/ http://www.lee-mac.com/tutorials.html https://www.cadtutor.net/tutorials/autolisp/quick-start.php they have step by step instructions with clear examples. also doesn't hurt to have a lisp dictionary for things you run across that might not understand whats its doing. https://documentation.help/AutoLISP-Functions/WSfacf1429558a55de1a7524c1004e616f8b-5913.htm