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  On-screen joystick with libgdx, boundary stops?  (Read 969 times)
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Offline NoFixedAbode

Junior Newbie





« Posted 2013-10-11 21:42:51 »

Hi all, I am new to java and libgdx and maths come to think of it!  I am trying to make an on-screen joystick for the android side of life.  So far I have drawn a filled circle and another smaller filled circle at the same centre coordinates.  I have the thumb circle moving around in regards to mouse and touch, with 'touchDragged' and resetting the thumb to centre with 'touchUp'.

At this point I am stuck!  I can use .dst to find the distance between the centre points(vector2) and the thumb circle(vector2) and I can find the angle 0 - 360 from the x line.  But how can I set the bounds and no the x and y coords so you can't move the thumb circle outside the bounds of the larger background circle.

I think the solution involves soh cah toa but my limited math skills are letting me down.  Can anyone point me in the right direction please I have been trawling the internet with limited success.

Many thanx in advance

Darren
Offline opiop65

JGO Kernel


Medals: 153
Projects: 7
Exp: 3 years


JumpButton Studios


« Reply #1 - Posted 2013-10-12 01:30:59 »

Here, look at this for collisions:
http://stackoverflow.com/questions/1736734/circle-circle-collision

Offline 65K
« Reply #2 - Posted 2013-10-12 09:02:26 »

Maybe looking at the sources of my joystick example helps: joystick

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Offline NoFixedAbode

Junior Newbie





« Reply #3 - Posted 2013-10-12 12:37:29 »

Opiop65 you are a gentleman and a squire....that was perfect. Lots of theory their and things to learn.

65k....looking now.  Ok maybe not..the link is broken page will not load.
Offline 65K
« Reply #4 - Posted 2013-10-12 12:59:56 »

Sorry, fixed the link.

Offline opiop65

JGO Kernel


Medals: 153
Projects: 7
Exp: 3 years


JumpButton Studios


« Reply #5 - Posted 2013-10-12 13:15:24 »

You can always thank me with a medal  Grin

Offline NoFixedAbode

Junior Newbie





« Reply #6 - Posted 2013-10-12 15:48:36 »

You can always thank me with a medal  Grin

If I new how I would do.....
Offline CodeHead

JGO Coder


Medals: 40


From rags to riches...to rags.


« Reply #7 - Posted 2013-10-12 16:02:13 »

Hit the "appreciate" link above his post. Cool

Arthur: Are all men from the future loud-mouthed braggarts?
Ash: Nope. Just me baby...Just me.
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