Topic: Getting Blocks with nEntselp?

[Lee Mac]

This may be an obvious question, but, whilst in a grread loop, is there any [quick] way to get a block from an (nentselp [pt]) selection?

Thanks,

Lee

[Keith™]

well, it is possible ...

nentselp returns a matrix with the entity at the point and the block entity as the last item in the list IF it is a block. If it is a simple entity, it will not return the name ...

In this simple example, I return the object at the point ... obviously more error checking will need to be done:

Code: [Select]

(defun getblname (/ grvals gcode gval myent)
;;; infinite grread loop with cursor tracking
  (while (setq grvals (grread T))
    (setq gcode (car grvals) ; get the interface
  gval (cadr grvals)) ; and associated data
    (if (= gcode 5) ; if it is a tracked point
;;; get the entity there, or junk if it isn't a block
;;; error checking needed here
      (setq myent (caar (reverse (nentselp gval))))
    )
  )
)

Hope you can make use of it

[CAB]

Another example using ssget:
http://www.theswamp.org/index.php?topic=19271.msg234324#msg234324

[CAB]

Lee,
You did not specify if the user was to PICK the object or pass the cursor over the object for detection.

I assume Keith's example gave you what you needed?  

[gile]

Hi,

You can have a look at gc:AreaGet routine in TotalArea_4.02.lsp.
This routine is used to get a "ToatalArea" bloc reference. It highlights the objets which are linked to block the cursor is over.

[Lee Mac]

Sorry for the late reply guys,

Keith, that is a great example.

I don't full understand the transformation matrix as, most of the time, nentselp seems to return a list identical to as if the user had used entsel, but after experimenting on a block, I see a whole matrix, with the entity names you mention.

> Gile

Thanks, I had a quick look at your routine as I knew that you would have had to use something to overcome this - but I didn't immediately see your method 

> CAB

Thanks for the link - nice example. The entity would be picked, but I believe I can use Keith's method either way.

Thanks once again for your time guys,

Lee

[Keith™]

The example I provided will do hot tracking of entitites by simply moving the mouse over them. I have used this in the past for dynamic displaying of entity data without having to select them. This way the user could see object properties with ease.

[Lee Mac]

Yeah, I toyed with that idea too