How to: Keep Attributes at Dynamic Block Center

Do you like using AutoCAD dynamic block? If you use stretch action, some element may not be on expected place. For example, block attributes will not stay at center.

In this AutoCAD tip, we created some drawing elements and add an attribute at the block center. We want to change the block size by stretching it. The challenge is to keep the attribute at the block center. There are two ways we can do to achieve it:

  1. Keep the it at it’s position and stretch the block both ways
  2. Stretch the block to one direction and at the same time move the attribute to keep it at the center.

Let’s try this. I use a simple dynamic block for this tip: a room number tag.

Creating the attribute

Creating it is just the same, we use ATTDEF. To make this easier, set the justification to center.

attribute_justification

One more thing: make sure lock position is active. Some action will not work if you set the position to not lock.

First alternative: stretch to both directions

This should be easy. It’s similar to what I described in this dynamic block tutorial, creating column. We set the base location to Midpoint, and add two stretch actions.

stretch_to_both_direction

Second alternative: Stretch and move actions

If you create a more complex dynamic block, you probably don’t want to stretch it to both direction. For example, you want to create a table that also has array action. When you stretch it, not only the table size change, but also add more chairs. The table sample is available in CAD Notes e-book: AutoCAD Block Best Practices.

In this situation, it will be easier to stretch the block to one direction. To keep the attribute at the center, we add one more action to move it when after stretching the block.

stretch_side_but_move_the_attributes

Remember: the attribute have to move half of the stretch action distance. If we stretch the distance 100 units, then we should move it 50 units. To achieve this, select the move action icon. Open properties palette and change the distance multiplier to 0.5.

move_action_distance_multiplier

Try it and have some fun! See video below to see how to do it.

Dynamic block tip: How to keep attributes at block center

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  1. Darren Maskell says

    Hi,

    I’m trying to create a dynamic block of a radiator (with it’s length scaleable) with attributes which I can put into a table using dataextraction.

    I can create both independently and they both work.

    Once I create the attributes in the dynamic block, the dynamism is lost (in other words, it becomes a standard block).

    Do you have any idea why this might happen and how it can be overcome?

    Regards,

    Darren

  2. demi says

    Quite useful though, I was looking on how to lock the pick point at middle position no matter how long you stretch the block, any ideas?