topic Re: Trimming a block array in AutoCAD Forum

Trimming a block array

Anonymous — Wed, 26 Jun 2019 17:43:42 GMT

Hi all,

I have made a dynamic block for a crosswalk set up so that I can place it and then pull it to a specified length using the array dynamic command. I need to be able to have the crosswalk trimmed to the sidewalks its connecting. I know you can do it the old fashion way of exploding it and then trimming it and I've tried using a xcut but it cant trim to arcs. any help would be appreciated.

-Devin

Re: Trimming a block array

nikm42Q9N — Wed, 26 Jun 2019 17:49:42 GMT

you need to put a stretch dynamic on the dynamic block. that way the pcs are adjustable

Re: Trimming a block array

Alfred.NESWADBA — Wed, 26 Jun 2019 17:50:19 GMT

Hi,

if you have a closed polyline as border you might use command _XCLIP (>>>details<<<)

- alfred -

Re: Trimming a block array

Anonymous — Wed, 26 Jun 2019 17:54:08 GMT

If I use that command I cannot trim the walk to the curved sidewalk. the polyline boundary can only be straight line segments. Any other ideas? Thanks.

Re: Trimming a block array

Alfred.NESWADBA — Wed, 26 Jun 2019 18:04:33 GMT

Hi,

>> I cannot trim the walk to the curved sidewalk

Correct, in case it does not depend on 100% accuracy (as sidwalks are not really build with curves, but segmented lines) ... I would:

draw a SPLINE as border
use command _SPLINEDIT ==> convert to polyline ==> precision set to 10
use this new polyline, which is quite close to curved (shown in attached dwg-file).

For now I do not have an idea for real curves using that option.

- alfred -

Re: Trimming a block array

Alfred.NESWADBA — Wed, 26 Jun 2019 18:18:21 GMT

Hi,

command _CLIPIT could be an alternative too (but also does some segmentation).

- alfred -

Re: Trimming a block array

Anonymous — Wed, 26 Jun 2019 18:19:09 GMT

I'll see what I can do with that, thanks!