AutoLISP Triming everything on one side of a line

[Fleybovich]

I am looking a way to trim everything sticking out on one side of a line, and if possible select lines that need to be all extended to the other side of the line. I am working on a really large file that needs a lot of editing with trim on one side of the line and extending all the line on the other side of the line. If anybody can help i would really really appreciate it.

Thank You

[alanjt]

Express Tools: EXTrim

[Fleybovich]

Im not sure how that command works because i tried it and it still left a few things untrimed even tho when i use the trim command it gets trimmed

[alanjt]

EXTRIM.gif...........

[Fleybovich]

oh wow thank you so much, i finally figured it with your help. Nice Video!

Do you have any ideas of how i can make a messy file with many lines overlapping into a clean file with zero lines overlapping?

I also attached a jpg of the drawing that im working on and i am trying to make the edges of the street blocks straight because they were imported using another program and they came out very crooked. Do you have an easy method of doing this?

Right now i am trimming away and i only showed you a small clip of the whole drawing. There are line 15-20 blocks with about 45-60 lots on each block.

If you have any idea how i can make this process go faster i would greatly appreciate it.

Thanks for the help

Feliks

[Freerefill]

I do this sort of stuff at my work (road edges, lot lines, etc) and from my experience, it's best to just accept that it'll never be straight I think most of that data is obtained by satellite or from ancient records, and I seriously doubt anyone who had a hand in creating the file cared much about making nice neat straight lines that looked super pretty. For what it's worth, it irks me to no end as well.

If you absolutely must make them straight, you could draw a polyline or xline to approximate it, and then manually move all the points to that line, or just use that line to trim out the spots that are screwy. There may be some complex way of speeding up that process, but I wouldn't know how. The only other thing I could think to suggest would be to re-think how you're importing it, but that's a long shot.

[alanjt]

I agree. GIS, etc. data is just ugly as hell.

This is the best I could come up with:

LWS.gif

[Freerefill]

How'd you manage that, Alan? I struggled for days trying to figure out a linear least squares formula (the ultimate goal was to get it done for a circle, but I still can't figure that one out).

[alanjt]

It's doesn't do anything fancy like that. It just removes all interior segments, so the LWPolyline is a single segment curve.

What're you trying to do? I'm not fully understanding.

[Fleybovich]

Really thats funny that you have to do the same. Well the only problem with accepting it is that after i import all the lots and streets and road etc. i have to hatch each item seperately, the roads, the building footprints, and the streets. To do that i need some kinda of boundary and its really difficult to get an easy boundary from the imported files. Anyways if you have any idea about hatching it easier let me know