How to Extend Lines

[Mountain_XD]

Please help me Extend Lines. Thank you so much!

Extend Lines.dwg

[Saxlle]

You don't even need a lisp for that, you can use EXTEND command from autocad.

[eldon]

If you set EDGEMODE to 1, then the selected object will extend to an imaginary extension of the boundary edge.

 

It might be now called TRIMEXTENDMODE, and should be set to 1

Edited June 5, 2025 by eldon
more info

[SLW210]

How accurate is the posted drawing to what you actually want to do?

 

On some threads, I have seen several simple examples posted originally that ended up having little to do with the OPs actual problem.

[Mountain_XD]

Thank you Saxlle. If I use extend from command line it will take a long time. I want to scan and select once and the job will be done.

[Saxlle]

18 hours ago, SLW210 said:

How accurate is the posted drawing to what you actually want to do?

I think the @SLW210 has the point here. 

[eldon]

6 hours ago, Mountain_XD said:

Thank you Saxlle. If I use extend from command line it will take a long time. I want to scan and select once and the job will be done.

 

With the posted drawing, and picking the individual points, it would take 34 picks from the command line.

 

Have you tried to use a fence selection? This would decrease your picks to about 10. Or have you tried the lasso selection?

[SLW210]

Is it always just straight lines?

 

If I have time, I'll give it a shot, but today is 1/2 day for me, so likely next week unless I find time at home.

 

IIRC, there should be some multi-fillet LISPs with window selection around, though that might be as tedious as Extend. Fillet with 0 radius will make the lines meet up, but not join.

 

Lee Mac has a Double Extend 

 

Lee Mac Intersection Functions

[Mountain_XD]

Thank you so much SLW210. Your Link is good !