dynamic tree block question: can this be done?

[Wojty1]

Hello everybody.

I know that this has already been asked, but I don't remember the keywords to search for the topic, so I made this new one.

I have a couple of questions regarding dynamic block creation.

1. Is it possible to create a dynamic block with parameters that can be set with a script file?
   e.g. a simple rectangle with linear parameters "w" (width = 3 cm) and "h" (height = 5 cm) at 0,0
   and a script like this "-INSERT rect 0,0 3 5" which would insert the specified rectangle.
2. Is it possible to have the value of a parameter displayed as text?
   e.g. a rectangle (3x5 cm) and the text "w= 3cm, h= 5cm" to the right of the rectangle.
3. Is it possible to have a void parameter that will only be used to show a text?
   e.g. a prism viewed from top with sides of 5 cm each inserted as a 2D object (square 5x5cm) where the parameters are "a= 5cm" and "h= 10cm" (height, which will not be drawn, only shown as text).

Attached is an example of what I would like to create.

Any help appreciated. Let me know if anything is not clear.

[SoaresASBCAD]

https://www.youtube.com/watch?v=M5IuRCBzz_M

[Wojty1]

@SoaresASBCAD Many thanks for the tutorial video, today I finally watched it 😌.

Unfortunately it doesn't cover my question.

So I'm asking again: Is it possible to create a dynamic block with some text that changes depending on the geometry (as shown in the screenshot)?

[j.palmeL29YX]

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@Wojty1 wrote: Is it possible to create a dynamic block with some text that changes depending on the geometry (as shown in the screenshot)?

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Yes. (Attribute -> Field -> BlockPlaceholder)

See attached example. 

(the  text will be updated after a REGEN)

[Wojty1]

Wow! Many thanks!

It works exactly as I wanted it to.

One more question ... or maybe two:
1. Is there an option to avoid to regen the drawing?

While reproducing this block from scratch I'm stuck at the attribute definition. I'm not sure if I understand the concept of how attributes are created.

2. Do I add a block attribute from within the block editor or in the drawing itself?

[j.palmeL29YX · Accepted solution]

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@Wojty1 wrote:

1. Is there an option to avoid to regen the drawing?

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To see the latest value of fields you can either update fields manually using the UPDATEFIELD command or let do it AutoCAD automatically after OPEN, SAVE, PLOT, ETRANSMIT or REGEN depending on the value of the system variable FIELDEVAL. 

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@Wojty1 wrote:

I'm stuck at the attribute definition.

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A quick and dirty video: 

For crone and stem AutoCAD "reads" the current values of the geometry (the parameters), height is a "normal" attribut with a leading text, whose value is asked the user for.

HTH

[Wojty1]

Many many thanks for your efforts! 🙏

Now I need some fine tuning of the block, so the text moves with the tree size.

That'll be the job of "Constraints" which I have to learn next.