Move endpoints to m2p

If I have two polylines that won't join via MPEDIT, is there a way to select the two endpoints that are near and nonjoining, and have them move to the midpoint between them? I have just learned of m2p today, and have been trying to figure a way to utilize it in this fashion.

I can easily stretch one end point to m2p, and then the other, but I'd like to automate it. I wish this an option for Pedit, Join.

Wouldn't it make more sense to move them to the intersecting point, not the midpoint between the two points?

The polylines in question are often parallel, or near parallel. An intersection, if it exists, could be far from the location intended/preferred.

Ahh, right on.

Shame they aren't Lines, you could use the old CHANGE command quite easily.

Thank you very much. I wasn't familiar with that, but will use it when the situation warrants it.

Had a few minutes and thought it'd be a bit of fun...

EDIT: http://www.cadtutor.net/forum/showthread.php?63194-Move-endpoints-to-m2p&p=431251&viewfull=1#post431251

Wow! That is incredible, and quite a bit more complex than I figured it would be. Thank you very much, alanjt.

A few minutes, eh ??? Very Nice.

This could work on LWPOLYLINEs only:

[b][color=BLACK]([/color][/b]defun c:jlwp [b][color=FUCHSIA]([/color][/b]/ ss e1 e2 d1 d2 l1 l2 s1 s2 f1 f2 m1 m2 mp md[b][color=FUCHSIA])[/color][/b]
 [b][color=FUCHSIA]([/color][/b]defun massoc [b][color=NAVY]([/color][/b]key alist / x nlist[b][color=NAVY])[/color][/b]
  [b][color=NAVY]([/color][/b]foreach x alist
    [b][color=MAROON]([/color][/b]if [b][color=GREEN]([/color][/b]eq key [b][color=BLUE]([/color][/b]car x[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b]
        [b][color=GREEN]([/color][/b]setq nlist [b][color=BLUE]([/color][/b]cons [b][color=RED]([/color][/b]cdr x[b][color=RED])[/color][/b] nlist[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
  [b][color=NAVY]([/color][/b]reverse nlist[b][color=NAVY])[/color][/b][b][color=FUCHSIA])[/color][/b]

 [b][color=FUCHSIA]([/color][/b]and [b][color=NAVY]([/color][/b]setq ss [b][color=MAROON]([/color][/b]ssget '[b][color=GREEN]([/color][/b][b][color=BLUE]([/color][/b]0 . [color=#2f4f4f]"LWPOLYLINE"[/color][b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
      [b][color=NAVY]([/color][/b]= [b][color=MAROON]([/color][/b]sslength ss[b][color=MAROON])[/color][/b] 2[b][color=NAVY])[/color][/b]
      [b][color=NAVY]([/color][/b]setq e1 [b][color=MAROON]([/color][/b]ssname ss 0[b][color=MAROON])[/color][/b]  e2 [b][color=MAROON]([/color][/b]ssname ss 1[b][color=MAROON])[/color][/b]
            d1 [b][color=MAROON]([/color][/b]entget e1[b][color=MAROON])[/color][/b]    d2 [b][color=MAROON]([/color][/b]entget e2[b][color=MAROON])[/color][/b]
            l1 [b][color=MAROON]([/color][/b]massoc 10 d1[b][color=MAROON])[/color][/b] l2 [b][color=MAROON]([/color][/b]massoc 10 d2[b][color=MAROON])[/color][/b]
            s1 [b][color=MAROON]([/color][/b]car l1[b][color=MAROON])[/color][/b]       s2 [b][color=MAROON]([/color][/b]car l2[b][color=MAROON])[/color][/b]
            f1 [b][color=MAROON]([/color][/b]last l1[b][color=MAROON])[/color][/b]      f2 [b][color=MAROON]([/color][/b]last l2[b][color=MAROON])[/color][/b]
            md [b][color=MAROON]([/color][/b]1+ [b][color=GREEN]([/color][/b]distance s1 s2[b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
      [b][color=NAVY]([/color][/b]foreach v [b][color=MAROON]([/color][/b]list s1 f1[b][color=MAROON])[/color][/b]
         [b][color=MAROON]([/color][/b]foreach p [b][color=GREEN]([/color][/b]list s2 f2[b][color=GREEN])[/color][/b]
            [b][color=GREEN]([/color][/b]if [b][color=BLUE]([/color][/b]<= [b][color=RED]([/color][/b]distance v p[b][color=RED])[/color][/b] md[b][color=BLUE])[/color][/b]
                [b][color=BLUE]([/color][/b]setq md [b][color=RED]([/color][/b]distance v p[b][color=RED])[/color][/b] m1 v m2 p[b][color=BLUE])[/color][/b] T[b][color=GREEN])[/color][/b][b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
      [b][color=NAVY]([/color][/b]setq mp [b][color=MAROON]([/color][/b]mapcar '[b][color=GREEN]([/color][/b]lambda [b][color=BLUE]([/color][/b]a b[b][color=BLUE])[/color][/b] [b][color=BLUE]([/color][/b]* [b][color=RED]([/color][/b]+ a b[b][color=RED])[/color][/b] 0.5[b][color=BLUE])[/color][/b][b][color=GREEN])[/color][/b] m1 m2[b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
      [b][color=NAVY]([/color][/b]entmod [b][color=MAROON]([/color][/b]subst [b][color=GREEN]([/color][/b]cons 10 mp[b][color=GREEN])[/color][/b] [b][color=GREEN]([/color][/b]cons 10 m1[b][color=GREEN])[/color][/b] d1[b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b]
      [b][color=NAVY]([/color][/b]entmod [b][color=MAROON]([/color][/b]subst [b][color=GREEN]([/color][/b]cons 10 mp[b][color=GREEN])[/color][/b] [b][color=GREEN]([/color][/b]cons 10 m2[b][color=GREEN])[/color][/b] d2[b][color=MAROON])[/color][/b][b][color=NAVY])[/color][/b][b][color=FUCHSIA])[/color][/b]
  [b][color=FUCHSIA]([/color][/b]prin1[b][color=FUCHSIA])[/color][/b][b][color=BLACK])[/color][/b]

-David

Minor update to account for locked layers and a minor mistake I made.

EDIT: http://www.cadtutor.net/forum/showthread.php?63194-Move-endpoints-to-m2p&p=431264&viewfull=1#post431264

Nicely done David.

Nicely done David.

Thanks We should probably both have filtered out PLINEs with bulges either in the first or last segment or closed PLINEs. I'm pretty sure they would give false results in that scenario. -David

Thanks We should probably both have filtered out PLINEs with bulges either in the first or last segment or closed PLINEs. I'm pretty sure they would give false results in that scenario. -David

Excellent point. The bulge doesn't really bother me, but I did forget to filter out closed plines. Thanks David.

Code updated.

JoinTwoLinesAtMidPoint.LSP