Topic: Absolute and Relative Coordinates in Lisp Function

[jtm2020hyo]

How can I use the prefix "*", "@", "#" in autolisp functions?

I mean, for "*" should I use something like this?

Command: (trans '(*1.0 2.0 3.0) 0 1)
*error*

[tombu]

Just modify the COORDS (System Variable) in the lisp and reset it in your local *error* function.
https://help.autodesk.com/view/ACD/2023/ENU/?guid=GUID-91D3C93C-9C89-4397-B855-92AFD5228422

[danAllen]

My non-expert summary. For coordinates in lisp, using command calls such as (command "line" "1,2,3" "3,4,5" ""), the coordinates are local UCS, unless you prefix with asterix  (command "line" "*1,2,3" "*3,4,5" ""), When using entget data, the coordinates are world UCS. You only need to trans the coordinates when taking data from enget and using in in a command, unless you prefix with the asterisk. The trans function does not use the asterix. You can translate a world ucs entget coordinate to local ucs/command usage via (trans '(1.0 2.0 3.0) 0 1), the 0=world, 1=current UCS, (trans pt from to)

See http://docs.autodesk.com/ACD/2013/ENU/index.html?url=files/GUID-1A316343-0B68-4DBE-8F49-B4D601CB8FCC.htm,topicNumber=d30e633480