Disable interactions on x-axis

Post about the Flash World Construction Kit and the Alchemy port of Box2D.
Posts: 3
Joined: Tue Aug 06, 2013 6:42 am

Disable interactions on x-axis

Postby pxblender » Tue Aug 13, 2013 7:58 am

Hi, I am trying to disable the movement of an object on x-axis. I try

Code: Select all

world.addEventListener(Event.ENTER_FRAME, loop);
function loop(evt:Event):void
   obj.x = 0;

I need that the obj interact only on y-axis.
The problem is when I drag on the x-axis or try to rotate pressing a key, the object don't stay in x = 0.
When I release the obj, it returns to x = 0. How can I avoid this behavior?


Posts: 172
Joined: Thu Mar 01, 2012 9:31 am

Re: Disable interactions on x-axis

Postby IstvanOrosi » Tue Aug 13, 2013 10:51 am

I wonder if it makes a difference that you are using Event.ENTER_FRAME instead of the box2d/WCK StepEvent.STEP.

I haven't looked much into it but in one case instead of using syncTransform,
obj.b2body.SetTransform(new V2(new_x/world.scale, new_y/world.scale), 0);
seemed to work.

Another idea. Depending on your project, you could create a physical wall (and perhaps another one on the other side) that the object cannot go through. This should constrain the movement.

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