Herbert,

Thanks for finding the background on this.

The classes Subdivision, SubdivisionHalfEdge, and SubdivisionQuadEdge are present in Squeak 3.2, but not in Squeak 2.8. Some of the methods have no author initials, so they date back to the early days of Squeak. All of the methods with timestamps are from 'ar' so I think that Andreas Raab wrote the package.

I see no direct references to these classes in the 2.8 image, and my guess would be that they were probably removed at some later point because they were not needed in the base image.

Given that the classes were written by Andreas, I think that it is safe to say that they will be of high quality, and that they will work with little or no change in the latest Squeak trunk images.

The classes are in category 'Graphics-Tools-Triangulation', so if you file that out from Squeak 3.8 and load it back in to your current Squeak image, it will work.

I just tried this in my trunk image, and the class side examples in Subdivision work fine, with no modifications required at all.

I am attaching the fileout from Squeak 3.8.

Good stuff, thanks for finding it :-)

Dave

On Thu, Jan 24, 2019 at 09:58:42PM +0100, Herbert K??nig wrote:

Hi Ralph,

in Squeak 3.6 and 3.8 there is class Subdivision with the comment:

"I perform (constraint) delauney triangulations on a set of points. See my class side for examples."

I know I once used it I guess in 3.6 but can't find that image anymore.

Cheers,

Herbert

Am 24.01.2019 um 19:19 schrieb Ralph Boland:

...

code in the workbench too (I need to be able to triangulate a polygon).

...

It would also be cool to see the workbench ported to Squeak. I would be willing to help with such a port but only as a minor contributer as I already have enough on my plate.

Ralph Boland