I need a "slider" in a circle

[Richmond Mathewson]

And, NO: this does NOT help at all: 
http://forums.livecode.com/viewtopic.php?f=7&t=27672

Richmond.

On 7/4/17 7:25 pm, Richmond Mathewson wrote:
> Hmm . . .
>
> I've made myself a jaggy circle by setting the points of an irregular 
> polygon to a
> sequence generated with a merry sine/cosine function . . .
>
> Now it's "dead easy (whatever that's supposed to mean) to animate a 
> "knob" round a "dial" as in:
>
> move grc "KNOB" to the points of grc "DIAL"
>
> BUT what would be a lot more fun would be a "knob" that could be moved 
> by the end-user with a mouse (or a finger on a tablet)
> by a sort of grab command, but in such a way that its movement was 
> constrained to the points of the pathway graphic.
>
> Thoughts . . .
>
> Richmond.
>
> On 7/4/17 5:20 pm, Todd Fabacher via use-livecode wrote:
>> Hello Livecode group,
>>
>> I have a situation where we need a slider, not a straight line, but as a
>> circle. I thing Scott Rossi did a demo of this at San Diego LC conference,
>> but I can't find the code samples to check. I just need to restrict the
>> movement to a circle when the user moves their finger. Maybe there is some
>> kind of dial example somewhere???
>>
>> All I am looking to do is move the slider in the semi-circle to move the
>> value forward or backwards.
>>
>> Thanks,
>>
>> Todd
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>