Need help with joystick controls

RocketBrain

i'm trying to make a joystick but keep it from sliding all over the screen but its not working. Can somebody tell me whats wrong? been driving me nuts.
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change attrib CenterX = Self.Position.x
change attrib CenterY = Self.Position.y
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When Touch = Pressed
Constrain attrib Self.Position.X = min(( self.CenterX +30), max( game.Touches.Touch 1.X ,( self.CenterX -30))))
Constrain attrib Self.Position.Y = min(( self.CenterY +30), max( game.Touches.Touch 1.Y ,( self.CenterY -30))))

but when i hit play the actor doesnt follow the touch, which i thought it should. wheres the error? i've checked the coding repeatedly and cant see it.

Photics

Does your game scroll?

RocketBrain

not yet. i'm just practicing atm so its just the one actor and nothing else yet.

Photics

What's the camera origin?

RocketBrain

0
0

Photics

The Camera hasn't moved. That's good. You don't have to offset for touch points.

...but why are you using CenterX/Y?

It's like you want to keep it in a 30 radius circle, but I'm not thinking that's the right way to do it. Is the actor supposed to stay in a circle, or not move more than 30 pixels at one time?

Also, when not using multi-touch, I use mouse position data.

RocketBrain

mouse position can be interchanged with touch on iOS?

yeah its suppose to stay within a certain distance from a specific point

and i'm glad you're replying Photics since i've been referencing your textbook thanks again btw for making that kicass tool

RocketBrain

its your example from p98

Photics

Oh, you're building a thumbstick?

You shouldn't use the mouse data then... unless there are no other buttons.

How is the actor moving. Where does it go when you touch it?

Photics

I think your formula is different than the one in the textbook...

Yours...
min(( self.CenterX +30), max( game.Touches.Touch 1.X ,( self.CenterX -30))))

Textbook...
min((self.X-Center+30),max(game.Mouse.Position.X,(self.X-Center-30)))

You have an extra parenthesis at the end.

RocketBrain

that was it! thanks boss

atm i'm not using it for anything i'm just learning the technique for future games. but it works now which is cool.

tenrdrmer

you know there is a joystick demo with it all setup for multitouch detection and everything right?

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