box2D: move body to the point(touchesEnded)

Question

I'm new to BOX2d and I need to move the body and the sprite from the center to the point where there was contact with a low rate, I tried to use a projectile-> SetTransform (b2Vec2 (location.x / PTM_RATIO, location.y / PTM_RATIO), 0); but the movement is very fast and no noticeable

score 0 · Accepted Answer · answered Jul 01 '11 at 13:28

0

i dont know much about this but try ApplyForce or ApplyImpulse property

answered Jul 01 '11 at 13:28

Virat Naithani

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Applying ApplyLinearImpulse body moves, but deviates from the point to which should move with repeated touches does not behave properly – Invader Jul 01 '11 at 13:54
then try mouse joint try this tutorial -> http://www.raywenderlich.com/475/how-to-create-a-simple-breakout-game-with-box2d-and-cocos2d-tutorial-part-12 – Virat Naithani Jul 02 '11 at 05:03
Thank you all, but after experimenting with mouseJoint I came to the conclusion that it is better to play with impulse and velocity, got what I wanted! – Invader Jul 06 '11 at 07:15

score 0 · Answer 2 · answered Jul 01 '11 at 15:02

Try using a mouse joint. From the Box2d manual:

[A mouse joint] attempts to drive a point on a body towards the current position of the cursor. There is no restriction on rotation.

Searching for mouse joint will give you quite a few samples...

http://www.box2d.org/forum/viewtopic.php?f=8&t=402

http://iphonedev.net/2009/08/05/how-to-grab-a-sprite-with-cocos2d-and-box2d/

box2D: move body to the point(touchesEnded)

2 Answers2