Dynamic block revealing shape (constrain point on polyline)

[Anonymous]

Is it possible to create a dynamic block where a change in attribute value will reveal more or less from a shape/contour/polyline?

Looking at attached sketch, I want to dynamically drive how much from the shape (circle in this case)  by changing a value.

In the end maybe the question is: can end of a line be constrained (geometrically?) on a polyline? (not only on the middle, perpendicular, end or vertex, but on any point of the polyline)

[imadHabash]

Hi and Welcome to AutoDesk Forum,

I suggest to move your question to Dynamic Blocks Forum >> Link << , there you will find really answers.

Good Luck..

[Libbya]

Without getting into custom code, you cannot use an attribute value to drive any other change in a dynamic block.  You can, however, use a user parameter (which can be entered in properties) to drive changes in a dynamic block and you can use a field in an attribute to display those changes if desired.  

[Anonymous]

Thank you for the info on the parameter driving the block.

But the underlying question of constraining the end of a line on a polyline (similar to object snap NEArest) still stands.

[Libbya]

Does the distance need to me infinitely adjustable or can you use an interval?  

[Libbya]

Here's a constraints version.