Box2D Forums

I've hit a wall trying to figure this one out, any help will be greatly appreciated.

Does anyone know how to modify the built-in dragging behavior to use TouchEvents instead of MouseEvents? Specifically for use with multiple touch points/draggable objects at once?

What device are you publishing to? Is this iOS?

I'm targeting the BlackBerry Playbook.

The "built-in dragging behaviour"? Are you talking about the testbed? That's not likely to work for multitouch at all, since it was only ever intended to have a single 'touch'.

I think you will have to do your own creating and destroying of MouseJoints to get this working properly. I did it recently on the iPhone - as long as you can tell which touch events belong to the same finger it shouldn't be too hard. You just need to hold a map from the 'fingers' to your MouseJoints, so that when a touch/finger does something, you know which MouseJoint to move or destroy.

Thanks! That should put me in the right direction. Much appreciated.

Wait wait wait. You got the alchemy port running on the iPhone?

oops... no. I thought you were gonna do that :p

Sorry sometimes I forget which sub-forum I'm talking to.

Happy xmas everyone,
I'm trying to get multitouch working with WCK. Can this be modified in one of the classes? I've looked around but could not find any startDrag code. My multitouch
code doesn't work with wck objects. Is there any way? It's crucial to the game I want to make, so would be a shame if it's not possible. If the object has to be a simple Mc
or sprite without attached bodies, that would be ok!

D1 and D2 are 2 movieclips which I need to be dragged at the same time by 2 players on the iPad.

I pasted the multitouch import classes in the WCK.as, and my 'onTouchMove' function works, but not the others.

Thanks,
Matt



import flash.ui.Multitouch;
import flash.ui.MultitouchInputMode;
import flash.events.TouchEvent;

Multitouch.inputMode = MultitouchInputMode.TOUCH_POINT;

var dragArray:Array = [D1, D2];

for (var i:int = 0; i < dragArray.length; i++) {

dragArray[i].addEventListener(TouchEvent.TOUCH_BEGIN, onTouchBegin);
dragArray[i].addEventListener(TouchEvent.TOUCH_MOVE, onTouchMove);
dragArray[i].addEventListener(TouchEvent.TOUCH_END, onTouchEnd);

}



function onTouchBegin(evt:TouchEvent) {
evt.currentTarget.startTouchDrag(evt.touchPointID);

}

function onTouchMove(evt:TouchEvent) {
evt.currentTarget.alpha = 0.5;
}

function onTouchEnd(evt:TouchEvent) {
evt.currentTarget.stopTouchDrag(evt.touchPointID);
}

Has no one tried this yet? I think this post was started about 4 years ago!

According to my calculations: 2013 - 2011 = 2 years

Not sure if it makes a difference but on one webpage I saw evt.target being used instead of evt.currentTarget.

Since you mentioned onTouchMove working, I would try to set the position with something like:
evt.target.x = evt.stageX;


If D1 and D2 are box2d objects then add:
evt.currentTarget.syncTransform();

Or maybe use:
evt.currentTarget.b2body.SetTransform(new V2(new_x/world_scale, new_y/world_scale), 0);