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If you only want whats inside use "WP"

Try Crossing Polygon (ssget "_CP" ....... ) (see http://lee-mac.com/ssget.html) - will that work? Could also try Window Polygon for entities that are completely inside the selected object

Thanks Steven, I will have a go at this.

I tried to answer your request. This seems correct to me, but I admit that there may be bad resolutions in some cases. Your request turns out to be complicated, I noticed that your request only concerned the case of a convex curve. I thought this was insufficient so I included the concave curve case. I don't think I will go further in development without remuneration... So you will have to settle for this last proposition. You have the source code, if you want to try to improve. Good luck! Retain_Wall.lsp

Using lisp, I think a more what it is your Dimming would be helpful as you can do select multiple say lines and dimension and also do the overall with a lisp. Post a dwg. Another way is to select all dims and get a start and end point to use. Another is pick, pick points and remember the pick points use 1st and last point, maybe the easiest way.

@Jonathan Handojo Be aware that you cannot rely on the Dynamic Block Visibility Parameter being named "Visibility...", it can have an arbitrary property name, just as an attribute can have an arbitrary tag name (within the naming limitations). @Sinucigasu I would suggest starting with the following resources: AfraLISP Ron Leigh AutoLISP Lessons Lee Mac Programming Tutorials

In both your linetype definitions, you are using the U factor, which will keep the symbol the same way up however you reverse the line. Whilst I do not have the facility to check, I would suggest changing the "U" for an "R" and see what happens.