If it doesn't offer you the Outboard-only option, that probably means the Polyline isn't actually 'closed' by AutoCAD's definition, but only looks closed by having its end at the same place as its beginning.

It's probably possible to catch that error and get around it, though I'd need to brush up on how to do it. So if you ask for both-sides buffering, and the source is too small for the inward one to work at all, there won't be any object inside, which I think may result in the same error.

The routine can determine whether a Circle or Arc or Ellipse is too small for inward Offsetting at the requested buffer width, but it can't decide that by calculation for things that can have irregular shapes, like Polylines and Splines. I don't think that can be fixed in a way that could be counted on to work in every situation - you may have to just do the Offsetting manually in such cases. When it fails like that, check whether a buffer boundary consists of more than one object, which results from some of those conditions. You could check by trying it on the same ones with the Outboard-only option, or with a smaller buffer width, and see whether it works right. That's probably the result of conditions such as described in the 'Can fail.' last paragraph of the comments at the top of the file. Description was not provided.' Any idea what to do to fix it?. with several of my closed polylines I'm getting the message 'Error: Automation Error. It doesn't have to be a separate shape.Īny help is appreciated. So a line weight could work as long as I could get the ends right. I should also mention that this would be just for a visual reference. And the posts I've found here so far seem to be regarding closed shapes and not dealing with the endpoint issue at all. I thought maybe somebody would have written a lisp routine or something for this but I haven't found it yet. For something simple like in the graphic it's not a big deal just to add the arcs, but when I get into more complicated and elaborate files that process can get tedious and time consuming. However, if I have say a line or an arc that is not a closed shape, the offset/weight will work along the length but it doesn't get the end points right. That works if what I'm buffering is a closed shape, because there are no endpoints. So if the buffer is around the 1' straight line, on each end there will be an arc that's the certain distance from the endpoints.įor what I do, I can generally use the offset or change the line weight. In GIS, there is a buffer command that, even if you use it on a straight line not a polygon just say a 1' line, it will draw a boundary around it of a certain distance. I am wondering if there is a way (say, a lisp routine) to create a buffer around a line.

Lisp progecad line measurement