Simplifying Polylines/Curve Fitting
The article linked in @pendean 's Reply has a broken link to something in the Forums, which could possibly be my PLDIET.lsp routine [PLD command] -- if so, that is available >here<. But one aspect of the OP's request that it will not do is to apply curvature across multiple segments. It will keep existing arc segments if you choose that option, but only as they are. It only removes vertices, leaving line segments between the adjacent vertices that it left in place.
[WEED mentioned in that article is the name of a routine that was, originally at least, only for "heavy" Polylines. PLDIET was written to do pretty much the same with LWPolylines, with a few other improvements -- see the comments at the top of the file.]
I've tried using the PLDiet command, but it seems to just turn a series of segments into one long, straight segment. I'm hoping to achieve more of a "curve fitting" effect, if possible. If this is something PLDiet can do, please advise! I've attached a screenshot of an example I manually re-worked, I'm hoping to automate this process.
@johnfischerLSI wrote:
.... If this is something PLDiet can do, ....
No, it's not. It only reduces quantity of vertices, but cannot change line segments to arc segments.
There is curve best fit algorithms. CIV3D has one built in. But knowing if curve produced is within tolerance to points would be the problem. Least squares comes to mind. Looking for a lisp version.
Found this Curve Fitting Algorithm - Lisp — BricsCAD Forum (bricsys.com) go down to Sakko post a couple of possible solutions. The circle one did give something to start with. Can maybe break at start and end.
