Two separate flips with one grip

[Anonymous]

Can anyone explain to me how i can control two or more parameters using a single grip?

The example I can give is a cone with an arc on the end that I want to be able to place a grip in the middle of the arc. When I move the grip I want the two diverging lines to extend and the arc to extend between them proportionally.

I have tried using combinations of stretches but couldn't get the arc to maintain its curve or to control it from a single grip.

Scale doesn't maintain the internal angle of the diverging lines so that's no good either.

I wondered about a multiple lookup but couldn't see how to link the values of the parameters to the lookup.

Am I missing something obvious here?

Example attached.

Many Thanks,

Simon 

[Libbya · Accepted solution]

Your thread title doesn't seem like it has anything at all to do with your question/example file.  You don't have any flips in the file.

How are you arriving at the second arc position?  You say you want the arc to extend proportionately, but what you have drawn does not do so. The first arc has a total angle of 98.12 and the second arc has a total angle of 116.  Without more specific information on how you arrive at that second arc, I don't see how to help.  

Attached is a file with a scale action added with an independent base point and it does what you ask (extends the lines and arc proportionately) but the arc does not match...

[Anonymous]

Libbya,

Thanks for the quick reply, I have absolutely no idea how flips got into the thread title.

It should read " two separate parameters controlled by one grip".

Thank you for your example this does exactly what I am looking for!

Can you recommend a tutorial on scale actions with independent base points?

Many Thanks,

Simon 

[Anonymous]

I should have asked this one earlier as well, is it possible to define a ratio for the scale action?

in the example I gave previously i have a calculation that i need to apply.

The arc line needs to be defined @ 5.3 times the height of the screen (Which itself works on a 16:10 ratio, width to height).

Does this need a diesel expression (I'm using LT 2018) or can it be done more simply than that?

[Libbya]

There isn't much explanation needed for a scale action with independent base point.  The independent base point allows you to change the base point of the scale action to whatever location you desire independent of the associated parameter's base point.  You can also add the scale action to other actions (e.g. stretch, move, rotate, etc...) and the base point will move accordingly.    

Is 'Distance1' the width of the screen?  If so then total arc length = [10/16*Distance1]*5.3?  That does not match the as-drawn values within the block.  What determines the length of the diagonal lines on the sides?  What determines the length of the vertical line?

Sure, you can scale to whatever ratio you like easily enough.  See screencast