On-screen joystick with libgdx, boundary stops?

Newbie & Debugging Questions
#1

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

#2

Here, look at this for collisions:

#3

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

#4

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.

#5

Sorry, fixed the link.

#6

You can always thank me with a medal ;D

#7

If I new how I would do…

#8

Hit the “appreciate” link above his post. 8)