How to create a multitouch volume knob rathe than a slider?

I'm trying to figure out how to approach making a volume knob, like you'd have on an amp or guitar.

So as the user drags left after clicking on it it would rotate counter clockwise, and if you clicked on it and dragged right it would turn clocwise, or adjusting the volume value in each case.

I couldn't find any examples through searching, just wondered if this had already been done?


Thanks

Simple enough.
Here you go.

Thanks so much, I'll check this out when I get back to my computer.

This work great thanks.

Just a couple of questions, how do I set this to shave limits? As in if it's a volume knob, from 0-10 and it starts at 5?

Here you go.
By altering the Knob objects Alterable Values, you can design your own Knob, seting its Visual Start Angle, Visual Angle Range, and the Maximum Value that the Range should represent.

About the multi touch, i havent ported anything to tablet/ smart phone yet, so i dont know exactly.
But i guess you just replace Mouse coords with Touch coords, should be easy.

Hi thanks for this, it's great!
My only thing is I want it to go clockwise from low to high and I can't quite figure out how to adjust your code to do this. Also, can it start at 50> So it can go from a min value of 0 to 100 put the knob starts half way between these values?

Yes your right it's fairly straight forward to port it to multitouch thanks.

Here.
Just set the Knobs Value_, and the Knob will adjust itself to this value initially.
( i allready set it to 50 )

Hello again, thanks for helping me out.
Really sorry but I'm a little stuck.
I opened your latest and what I'm trying to get is that
7 O'clock is the minimum then the knob turns clockwise to a maximum at 5 O'clock

I want to start half way so I get that the Knob value gives you this as a position subtracted from the maximum value.

I try adjusting the angle start and angle range, I get the concept but I can't seem to get it to rotate from 7 till 5 without it going a bit odd and spinning twice, perhaps I'm putting in the worn figures for these Alterable Values?

Ah yes, as i was comparing directly with the Objects built in Angle, there were some problems with Angles of 'negative values'.
I redesigned it, now using an Alterable Value for Angle_, and you should now be able to input negative Angles as Start and Range.

This works perfectly, thanks very much for taking the time to help!

I was also wondering if this could also snap incrementally so say there were 10 actual rotational positions that it went to, so rather than smoothly rotating from 0-100 it went in steps of 10 if that makes sense?

K, so i took my time with this last one, and im quite proud of my knob

I redesigned it abit
- Knob automatically adjusts itself to the initial Value_
- AngleStart_ is now the left-side start point, AngleRange_ spans from AngleStart_ clockwize ( together defining the range the Knob can be turned )
- SnapValue_ lets you define snap intervals in terms of 'Value' ( starting at AngleStart_ ). It can snap quite accurately to any value, even below zero ( but be sure to adjust KnobSensitivity_ if you are snapping to a low value like 0.1, or else it will systematically skip past snap points ). If you set the snap value to something strange, not able to divide the 'max value', it will still snap to the minimum and maximum values.
- You can adjust TurnSensitivity_, which is a coefficient ( 0.5 is half sensitivity, 2 is double sensitivity etc )

Hi there, this is absolutely brilliant, I really appreciate you taking the time.

The Turn Sensitivity idea is a really great addition to really tune it into a nice movement!

Thanks!

Hey, sorry me again.
Thanks for this, it's amazingly useful.

I just wanted to ask, I have a knob that goes from 0 - 100, I can change the max number to anything, is there a way I can change the minimum number so it goes from say 1-100, or 20-230 etc..?

Or is there some simple maths that I can just use to have something already grab the current knob value settings from 0-100 and covert them to something else?

Thanks again!

Sorry for posting twice, I think I can use this to get what I want using your existing setup, thanks again!

NewValue = (((OldValue - OldMin) * (NewMax - NewMin)) / (OldMax - OldMin)) + NewMin

This is strange, but the 'snap to value' function no longer seem to be working.
Does it work on your end?
All i did was run a windows uppdate, i havent change the example since i posted it

EDIT:
Nevermind, i hardcoded the SnapTo value at Start Of Frame

Hi there, yeah that SnapTo vlaue confused me too at first :)

Here is a new version
- You can now define a 'Minimum Value' for the knob
( Also removed the hardcoded 'SnapTo_' value at start of frame, that shouldt be there in the first place )

Wait, there is a bug

EDIT:
Here, should be flawless

King_Cool this is really kind of you, thanks for taking the time to help so much.
I had work arounds to get what I needed using the equation I mentioned above, but this new version just makes everything cleaner :)
Thanks again!