Point grip using constraints

[kasperwuyts]

Hello all

I have a question about constraints: Is it possible to get a point grip in a dynamic block that uses constraints?

I am trying to simulate the behaviour of a Polar Stretch action. I want to use constraints instead of actions because of the calculation it lets me do. Right now i have to use two grips, one to rotate, one to lengthen. It would be handier if they could be combined into one point grip.

In annex is my most current example of this.

Thanks in advance.

[Libbya]

What calculation are you trying to do that you feel is easier with constraints?  

[kasperwuyts]

In the block I attached there is a parameter called 'BarLength'  which is a calculation of the total length of bars that need to be supplied with the turnbuckle, based on the total_length parameter. Maybe this is also possible using actions, i don't know. It's user friendly to be able to see the calculated value in the properties palette.

[kasperwuyts]

It's a shame really, that there is no equivalent of a point parameter using constraints.

Maybe a suggestion for an addition to the parametrics: A coordinate constraint, that would create two parameters, either cartesian( x and y) or polar (radius and distance). And ofcourse it would be manipulated with a single point grip.

[Libbya]

IMO constraints stink in general...  They are the most glichy and inconsistent aspect of Autocad that I know of.  

Using a formula field and dynamic parameters and actions can yield the same calculation and work much more consistently.