Draggable hit wall

[ppdemo 0 Likes (Newbie)]

Hi everyone, I'm newbie. Just want to know. how to restrict the direction of draggable while hit an another object. 
in the codepen example, I have a Green box is draggable. when we hit the Black box. i needs to act like wall.

 

Thanks

See the Pen oNaaowL?editors=0010 by demo-ppad (@demo-ppad) on CodePen

[PointC 14,466 Likes (Superhero)]

You're looking for collision detection. There are several threads about the topic around the forum. Here are a few to get you started.