topic Re: Programming Challenge 10/22 in Visual LISP, AutoLISP and General Customization Forum

Programming Challenge 10/22

john.uhden — Sun, 18 Dec 2022 22:38:34 GMT

A bottle of Walker Black to anyone who can programmatically convert a straight polyline segment to one having only one radius, which is less than half the chord. No, you may not add vertices.

Re: Programming Challenge 10/22

Sea-Haven — Mon, 19 Dec 2022 00:13:04 GMT

I dont think you can have less than 1/2 the length of the straight segment once you go less the arc does not go through the two segment points, could move those 2 points by like 1e-10 which would not in a sense reveal a change in the segment lengths and the radius would appear to be 1/2 segment length. Pretty easy to program.

Happy for some one to say I am wrong

Re: Programming Challenge 10/22

hak_vz — Mon, 19 Dec 2022 06:39:29 GMT

Polyline bulges

Re: Programming Challenge 10/22

Kent1Cooper — Mon, 19 Dec 2022 12:32:02 GMT

Yeah, and while you're at it, draw a Circle whose radius is less than half its diameter.

Re: Programming Challenge 10/22

ronjonp — Mon, 19 Dec 2022 14:49:12 GMT

@john.uhden I've always liked this code from master ElpanovEvgeniy.

Re: Programming Challenge 10/22

leeminardi — Mon, 19 Dec 2022 15:11:46 GMT

@john.uhden wrote:
A bottle of Walker Black to anyone who can programmatically convert a straight polyline segment to one having only one radius, which is less than half the chord. No, you may not add vertices.

Since a single arc cannot be created between two points with a radius less than half the distance between the two points the answer to the question must lie in a closer examination of the question wording. It is noted that the word "arc" never appears in the question. A look at the DXF codes for a "polyline" indicate the possibility that perhaps a solution may be possible if a spline fit was considered but what would that imply about a radius? Still, no solution in site. We could then turn to the bottle of Walker Black. Ah, I think there's where the solution lies! Consuming the bottle would make all things possible. Happy holidays!

Lee

Re: Programming Challenge 10/22

john.uhden — Mon, 19 Dec 2022 16:01:29 GMT

@Sea-Haven

You only "don't think?"

Re: Programming Challenge 10/22

john.uhden — Mon, 19 Dec 2022 16:03:35 GMT

@hak_vz

Thanks, Hak. I had no idea!

Re: Programming Challenge 10/22

john.uhden — Mon, 19 Dec 2022 16:11:07 GMT

@ronjonp

Ah, grread. I've been meaning to add that for decades.

Too bad that Jason Bourne had to extirpate him.