Box2dWeb: rotating object about a point

[Abhishek Bharti]

Hello,

I am having problem rotating box2d object back and forth around a point.

To better understand my problem i have prepared an example clicking on key rotate the paddle when u click again the paddle rotate back to its initial position.

http://abhishekbharti.pe.hu

 

i want to simulate something like this in box2dWeb.  

Thanks in advance

[Milton]

Maybe look at http://phaser.io/examples/v2/box2d/pinball

Looks like revoluteJoint is what you want.

[Abhishek Bharti]

I tried revoluteJoint along with enabling limit and setting LoweAngle. I got upto 50% what i want but i cant make the paddle go back to its initial position bcz gravity keep it pushing down.

[Milton]

Hmm, maybe use a kinematic if you don't want gravity.

Or look at body->SetAwake(false);
http://box2d.org/forum/viewtopic.php?f=18&t=7117

I'm just guessing here, I know nothing about Box2D, I prefer Nape

[Abhishek Bharti]

(SOLVED) finally i solved the puzzle,

To get the paddle back to its initial position i just need to counter gravity by applying force to that paddle in opposite direction of gravity like this: body.ApplyForce(body.GetMass()*-world.GetGravity(), body.GetWorldCenter());  need to apply this force every frame.

 

This article here helped me:

http://www.iforce2d.net/b2dtut/custom-gravity