Polyline modification LISP

[swanny89]

Hi all,

 

Long story short, I waste tens of hours per year creating "quirks" in polylines, and I'm hoping that this could be automated using a LISP....problem is I have no idea where to start when it comes to manipulating geometry with LISP (or even if what I'm trying to achieve is possible).

I'm wondering if anyone has a lisp, or could create a lisp (I will be eternally grateful) that can modify a polyline in a specific manner.

 

The image below shows what I'm trying to achieve. I'd love to have 2 lisps. One to do corners (type 1 - calld "quirkc" ) and another to do lines (type 2 - called "quirkl"). The functionality I'd like to achieve in these LISPS is as follows;

1. Activate the lisp

2. Pick a point on the line or the corner (these geometries are polylines or closed polylines)

3. Have a prompt appear asking for width (x) and height (y)

4. modify the polyline as shown (create additional points in the polyline offset the required x and y distances)

 

Thank you in advance for any help you can provide (or simply telling me this is not possible).

 

 

[devitg]

On 10/18/2025 at 5:28 AM, swanny89 said:

Hi all,

 

Long story short, I waste tens of hours per year creating "quirks" in polylines, and I'm hoping that this could be automated using a LISP....problem is I have no idea where to start when it comes to manipulating geometry with LISP (or even if what I'm trying to achieve is possible).

I'm wondering if anyone has a lisp, or could create a lisp (I will be eternally grateful) that can modify a polyline in a specific manner.

 

The image below shows what I'm trying to achieve. I'd love to have 2 lisps. One to do corners (type 1 - calld "quirkc" ) and another to do lines (type 2 - called "quirkl"). The functionality I'd like to achieve in these LISPS is as follows;

1. Activate the lisp

2. Pick a point on the line or the corner (these geometries are polylines or closed polylines)

3. Have a prompt appear asking for width (x) and height (y)

4. modify the polyline as shown (create additional points in the polyline offset the required x and y distances)

 

Thank you in advance for any help you can provide (or simply telling me this is not possible).

 

 

@swanny89 Please upload your.dwg sample.  Would be all polylines  rectangles orthogonal to X and Y axis?

[swanny89]

@devitg

 

Thank you for taking the time to look into this for me!

Attached is a copy of the dwg with the basic geometry (before and after). I'd say in 90% of cases the rectangles would be orthogonal like you say, but sometimes they can be at any angle.

 

If we could capture the 90% use case that would be hugely beneficial on it's own.

Quirk.dwg