Box2D Forums

Hello,

I have an object on the layer. When a user touches a place on the screen I want the object to have an initial force applied and head in that direction. I just can't get my head around the vector maths to apply the force in the right direction.

Here is a diagram with an example what I am trying to achieve:
http://imgur.com/uCXuq





The setLiniearVelocity seems to apply the force I require but there is one huge flaw, the objects ALWAYS go to the right. If I click left to the object I want the object to go left. I think the problem is I am always passing a positive vector in.

You are using the touch location as a direction.... it's not a direction, it's only a location!
To get the direction from the body to the touch location you could try something like:

You are incredible, thank you irresistible force. You helped me with a previous problem I was having with cocos2d aswell

Thank you so much. Keep up the good work for replying when others are not.