Entmake HATCH entity

After working on some autolisp code where I needed to create several HATCH entities, I figured that using (entmake) to do the job would be much faster than pushing the command line version of the HATCH command.

I didn't have my own example of this, and after checking out the DXF reference, it looked a bit more complicated than other entities, so I set out in search of some sample code that worked.... which led me to a post by "CarlB" over in the CADTutor forums that he had posted a few years ago. This worked great until I added in the scale factor and changed the pattern from SOLID to ANSI31. After a few iterations of trial and error, I managed to make it do what I wanted.

When using a real pattern (as opposed to SOLID), you have to specify a few more parameters. Head over to this thread in the CADTutor forums for the example code.

As it turns out, using (entmake) is about 10 times faster than using the (command) function in this case.

EDIT: I failed to mention that the example posted at the link above is for hatching a simple boundary defined by four lines. If you have arcs or other entities involved, the code will be a bit different.