is there a advanced way of trimming?

[sairahcazj]

Im trying to work on a function where the user just "window poly's" around a portion of "a big grid of lines" and then after the user "finishes the window poly" the routine trims out the selected area from the big grid leaving a clean gap between the two . I've tried to approach it a couple of ways using the "trim" command, but so far Im still ending up having to select the other lines around the area in order to get a clean break between the lines that run parallel to the selected area. Has someone done something similar to this before or know of a better way.
Thanks

[rad.77676]

You might want to look at entmake, I put together a routine to "trim" utility crossings in a civil base dwg and had to switch to the entmake command because trim was not consistent.

[sairahcazj]

thanks i will mess around with that and see what i get.

[Tom Beauford]

That routine already comes with Autocad's Express Tools "extrim" at the command line or "Express => Tools => cokie cutter trim" from the menu.
Im trying to work on a function where the user just "window poly's" around a portion of "a big grid of lines" and then after the user "finishes the window poly" the routine trims out the selected area from the big grid leaving a clean gap between the two . I've tried to approach it a couple of ways using the "trim" command, but so far Im still ending up having to select the other lines around the area in order to get a clean break between the lines that run parallel to the selected area. Has someone done something similar to this before or know of a better way.
Thanks

[CADNate]

Have you tried using the "TRIM" command along with fince? It's not a lisp but works well with having to trim multiple lines.
Hope this helps.
Nathan