dxf group codes

Greg had wanted to modify the layer table, turns out I wanted to modify the view table. until a few days ago I had been clueless. but the dxf codes '(290 . 1) '(370 . -3) are a pair of magic beans - it would seem.

joy.

roy can now create views. he has great plans for not having to draw his window elevations "by hand" anymore. all because I can work from their (10 X Y) group codes, relative. read the door or window designator on the plan view and create it (somewhat automatically) on the elevation. many thanks.

but WHERE THE HECK WAS THIS SECRET KNOWLEDGE HIDDEN? been through the "books", or thought I had. did I miss it?

checked out afralisp, and it is much improved. kudos Kenny. but unless I missed it, 290 and 370 are left out of his DXF table.

???

and one more thing, if I may.

I never did quite get how group codes 10 AND 11 apply to text. whenever I am typing lisp I just modify both of them and say the hell with it. it works. I'd drather undertand.thought for the longest time it had to do with JUSTIFICATION but I am probablly just wrong.

thanks.

........

yes, it do. thanks.

I get anal retentive about my text alignment(s) - never use baseline left. can't conceive a place where I would. middle center, top left, top center.

an occasional bottom center......

so I had noticed the grips, but the had NEVER been both in the same place.

cheers

Just indulging your original question:

DXF code 290 is a layer table item for plottable or not. DXF code 370 is another more common item for assigning a specific lineweight to an item.

To get the entries for lineweight 370 code perform the following:

Draw a simple line were the color is bylayer and lineweight is by layer.

List the DXF codes by entering

(entget (car (entsel)))

at the command line and selecting the object.

it returns the dotted pair for the object. Notice, that it does not list the 370 dotted pair item. Now change the lineweight associated with the object, to say 0.09 mm. Perform the same test again by typing (entget (car (entsel))) at the command line and selecting the object.

Notice the (370 . 9) listed with the entity information. This can be extended to similarly obtain DXF information for layers, blocks, text style and other table items using tableobjname. The syntax would simply be

(entget (tblobjname "LAYER" "Test Layer Name"))

By far this is the most difficult way to handle automation projects but gives you absolute control and speed. Convenient if used with reactor or events depending on what side of the house you program. Remember, you cannot use commands with reactors.

Hope this was helpful.

MJG

roy wrote:

very much over my head, but I enjoy a challenge. so call it very helpful. I can create views now, so the lisp I am working on will be useful. complete understanding can come later.

thank you.