Stretch an arcs height without moving end points

[norm77]

Hello,
I'm trying to make a dynamic block that will stretch the height of an arc while not moving the end points; similar to using the arc's midpoint grip. Can this be done? If so could that height have a distance multiplier of 0.5 when chained to another stretch action?

-Norm

Using AutoCAD 2008.

[Anonymous]

There seem to be so many variable factors to making this work automatically for all possible arc segments, that Ian's solution may be the most practical one. All one has to do to maintain the two "fixed" points is to mark one, and do the adjustment in two parts. Simple and sweet 🙂

[Anonymous]

I think the problem is that the parameter for the stretch needs to be scaled with the arc in order for the stretch to work properly. This has to be done without the stretch being activated which is why I had to do the stretch manually. A mechanism for switching the chaining on & off by the action being used to affect the parameter might be a useful addition for the future.

I'm looking forward to learning about parametric constraints when we next upgrade.