self trimming block?

[CB89]

hello to every one, I was looking for a way to make a block that would trim any line that would go thru it.

For example if i have a block of a circle and it has many lines connecting to it at various angles, Is there a way to have the lines automatically trim?

I found this Article but I am confused of how it would work with a circle.

http://www.afralisp.net/archive/lispa/lisp52.htm

[fuccaro]

CB89
Don't try to post hyperlinks, you will get your posts moderated. That means that it will appear for public only after a moderator approves it. Read the forum rules.

[ReMark]

I've seen this feature in AutoCAD Electrical with the blocks it inserts but I wonder, since we are dealing with blocks, if the insertion actually "breaks" the line instead.

[Cat]

hello to every one, I was looking for a way to make a block that would trim any line that would go thru it.

For example if i have a block of a circle and it has many lines connecting to it at various angles, Is there a way to have the lines automatically trim?

I found this Article but I am confused of how it would work with a circle.

http://www.afralisp.net/archive/lispa/lisp52.htm

That's a lot of code to break at two points. To use that code with a circle, you would have to have consistent specific points where any lines crossed through the circle.

[lpseifert]

If you need to 'trim' the lines for appearance purposes you can create a block that has a circle and a wipeout with a polygon as the border. It doesn't actually trim the lines, just 'hides' them. Attached is a dynamic block that is used for property corners on survey drawings.

[BIGAL]

Another way maybe if you really want to trim rather than hide would be to have 2 blocks the first being a polyline around your block just explode then "Extrim" "last" Erase last then insert block required. You could do it as a command or a lisp.

[CB89]

Wow, thank you for all the replies. That was faster than I expected. "lpseifert" that is so simple I didn't even think about it thank you. I guess for my purposes this would be the easiest and fastest way. As to the lisp commands, I just found out about the whole programming thing a couple of weeks ago. Im still a complete noob to the whole idea but I am trying to learn with all the links from this site. (they didn't teach lisp at my high school) But I will try the different approaches.

Thank You to everyone

PS: Sorry about the link, like I said NOOB.