Comments on: Interactive Spin Actionscript Tutorial

By: [Flash CS3] - Drehknopfprobleme ... - Flashforum

[Flash CS3] - Drehknopfprobleme ... - Flashforum — Fri, 08 Jan 2010 10:29:41 +0000

[...] hab grad beim suchen folgenden Link gefunden: Interactive Spin Actionscript Tutorial | circlecube Vielleicht hilft dir das weiter. Greets Schnetty __________________ Chaos ist nur eine [...]

By: Stephen James

Stephen James — Fri, 08 May 2009 17:48:06 +0000

Thank you, Evan. I have looking for a navigation wheel that I could spin and this is perfect for it.

By: rihamfathy

rihamfathy — Tue, 07 Apr 2009 15:06:23 +0000

i have a question!!
how can i make the object 3d and move it in all directions
(if i have a footage of anything such as a mobile and i want to make it 3d) how can i modify this script to do what i want??
thanks in advanced…

By: Damion Murray

Damion Murray — Tue, 24 Feb 2009 15:54:17 +0000

There are two solutions to the rotation problem. One involves using vector math to find angular displacements by first mapping flash’s piece-wise rotational range of [0, -180][180, 0] to the standard [0, 360] rotational range typically used in math, applying the Vector Dot Product to find the smaller angle between two vectors and finally determining the direction of rotation (clockwise or counter-clockwise). This is the most robust solution since it is based on standard mathematical models of rotation. But most Flash Developers coming from a design background may have trouble grappling with its more technical aspects. The second, more accessible solution involves exploiting the relationships between nested clips. But that’s all I am going to say on the matter. Half the fun is figuring stuff out for oneself.

By: Gerald

Gerald — Tue, 07 Oct 2008 01:23:38 +0000

Great tutorial. One question, how would I make the knob only spin a certain degree? Say if I wanted this to be a volume knob and would want it to only spin a certain degree as if turning the knob on a speaker amplifier. Thanks!

By: Craig

Craig — Wed, 02 Jul 2008 03:56:12 +0000

thanks you guys both. This is perfect for what i am doing. (making tutorials for a gas-fitting school), i am going to try apply this rotation to one of the gas taps. Just have to figure out how to make a ‘maximum’ amount of turns.

By: Scott

Scott — Sat, 24 May 2008 21:58:39 +0000

Here’s a fix, albeit not perfect, to the above mentioned problem. Within the onEnterFrame actions, find the line that says:

accr = ((r-oldr)+accr)/2;

and change it to this….

if (r-oldr > 160 || r-oldr < -160){
accr = ((0)+accr);
}else{
accr = ((r-oldr)+accr)/2;
}

I’m in the process of implementing this code into a project. When it’s ready I’ll try to remember to link it.

By: Evan Mullins

Evan Mullins — Mon, 17 Mar 2008 15:11:43 +0000

Thanks for catching that Zac, I hadn’t noticed that hiccup in there…
It seems to be when it is calculating the acceleration as you drag through the negative x-axis (from the origin of the knob). It’s because I’m using the difference between old rotation and current rotation to find the acceleration (line 32), and when oldr is -179 and new is 180 that makes for quite a bit of acceleration… accr = ((r – oldr) + accr)/2; … it helps I guess that it’s averaged with the old accr, but it doesn’t correct it by any means.
When I have some time I’ll have to get in and map the accr calculation correctly to see the values as circular, … 178, 179, 180, -179, -178 …

By: Zac

Zac — Mon, 17 Mar 2008 06:24:46 +0000

Hi Evan

Grab the knob and rotate it all the way around for one revolution without letting go.

There is a rather violent movement when the user rotates the knob all the way through x < 0 and when y passes through 0 (positive to negative or negative to positive). It jumps to the other side (180 deg away) and then rapidly comes back again.

I would suggest not using atan2 and using only sine to determine your rotation.