finding the angle of an analog joystick

[mobichan]

Hey Guys,

So, I am trying to manualy calculate the angle of an xbox360 analog stick. The gamepad returns values between -100 and 100 for the horizontal and vertical position. I was trying to apply arctan2 to make it work, but am not able to get it to return values between 0 and 360.

Can anyone offer a method to approach this?

Thanks in advance,

Mobichan

[LB]

It returns a value between -180 and 180, not 0 and 360. Maybe that was your problem?

[mobichan]

I am actually trying to figure out how to deal with working with a vetical and horizontal range, instead of having a start x/y and end x/y. But I am so used to using atan2, that I don't know where to start.

My initial thought was to use atan2(stickYPos, StickXPos) but that is yielding values between 0 and 3.14.

[LB]

Well, think of the start (X,Y) as (0,0) and the end (X,Y) as the joystick position values.

[mobichan]

I thought that was what the formula I wrote would do, but it didn't return values between -180 and 180. I had also tried atan2(stickYPos - 0, StickXPos - 0) but no luck.

[LB]

That's because the formula in computers is:
ATan2(0-StickYPos, StickXPos-0)

[mobichan]

ATan2(0-StickYPos, StickXPos-0) is returning the same range of 0 to 3.14. Any idea why it returns the same values as using ATan2(StickYPos, StickXPos)?

[Jacob]

Are you using an extension? MMF2 operates in degrees, not radians. use aTan2(0-Y,*57.2957795

EDIT: That ^^ will give you a value between 0 to 180.

[mobichan]

Thanks Jacob. I guess I was getting the result in radians after all. I just needed to convert them to degrees.

[LB]

Does this MFA work for you? It seems weird that MMF2 would give you a value in radians instead of degrees.
http://www.clickteam.com/epicenter/ubbthreads.php?ubb=showflat&Number=236571#Post2365 71