Delete outside of multiple polylines in one instance, is this possible?
Try use command TRIM. Select cutting polylines and then select contoure you want to trim.
Miljenko Hatlak
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
You can use command TRIM or express tool EXTRIM.
Trim outside each cutting polyline, and than select and erase all elements outside.
It can be automatized but it can produce unwanted result.
When trimm, in your sample select all tri cutting polylines and then pek each polyline to cut outside this cutting areas. You can select more tan one polyline (let say 2-3) since more of them can crush acad. As you progress you can increase number of selected polylines to cut.
With extrim you can cut arround just one cutting edge.
It took me no more then 20 seconds to do it with your sample
Miljenko Hatlak
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
@hak_vz wrote:
....
With extrim you can cut arround just one cutting edge.
It took me no more then 20 seconds to do it with your sample
The problem with EXTRIM, since it allows only one cutting edge, is that if you use it with the upper-left bigger outline, things are cut away that also pass through the lower-left outline, but they want the parts of those within that to remain. And vice versa. [Doing it with the right-end outline doesn't seem to affect anything that passes through the others.] You would need to Break or Trim pieces out of all those that pass through both, somewhere in between the two outlines, then do EXTRIM with each of those outlines.
TRIM with a few Fence selections could handle that issue, and fairly quickly, but would not also eliminate things that don't cross any outline, so there would still be things remaining that they'd need to ERASE. That's also true of the results after EXTRIM.
I don't have a solution, but try a Search -- there could be something already.
You might be able to modify the EXTRIM Lisp tool from Express tools. The "outside" trim will be easier, just watch for lines going through multiple "isles" (will need to be Break-ed first) and the remaining lines going through none of them (can be then deleted with "all minus isles").
Vladimir Michl, www.cadstudio.cz - www.cadforum.cz
I do similar work almost daily and command TRIM do the trick. Once you cut all elements that pass through the fence its easy to erase all the rest. For some elements break is needed.
Today I'm crushed after tough working day and not in a mood to write some code.
Miljenko Hatlak
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
@Jonathan.Gray68UQWJust use command TRIM. Select cutting edges, and then crossing polylines as @Kent1Cooper explained in detail. Erasing rest is easy. Just be patient with selections.
Miljenko Hatlak
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
Unfortunately there is no simple solution for your problem. I have had similar tasks many times and I know how you feel. Similar situations have forced me to learn Autolisp.
Miljenko Hatlak
Did your question get successfully answered? Then click on the ACCEPT SOLUTION button.
@vladimir_michl wrote:
You might be able to modify the EXTRIM Lisp tool from Express tools. ....
... but maybe not legally. See the copyright notice at the top. It references the License Agreement, and maybe that allows this kind of thing. If so, it does use a regular Trim command, so maybe there's a way to have it allow selection of more than one boundary, and step through doing its thing around each of them while using all of them as Trim boundaries. That would get around the problem of things that pass through more than one boundary.
But eliminating stuff that doesn't touch any of the boundaries would be entirely additional to what EXTRIM is set up to do.
@cadffm wrote:
....
If someone don't like to re-write there own Extrim and he want to use the expresstools code, it isn't a problem.
Just using the subfunction ETRIM, nothing to copy, nothing to edit.
But there would be something to edit. The Trim command that uses only one Trim boundary object is inside the (etrim) subfunction, which works with only one object as its 'na' argument [for example, it applies (entget) to it, so it can't be a multiple-object selection set]. So at the very least (etrim) would need to be altered to take a selection of multiple objects as Trim boundaries. The stepping through them and (etrim)-ing at each one could presumably be handled outside (etrim), but that by itself wouldn't do the job.
@cadffm wrote:
....
you can write your own part for object selection and foreach- each object ETRIM.
....
You would still have the problem described in Message 5. In their sample drawing, the (etrim) subfunction [unaltered] cannot use both their upper left and lower left outlines as Trim boundaries in the same TRIM command. So if (foreach) gets to (etrim)-ing using the upper left outline first, some things that will be cut away outside it have parts that pass inside the lower left outline, and should remain within that. They won't remain there unless the TRIM command inside (etrim) can be edited to accept both outlines as Trim boundaries.
