A lot of folks have been asking about how to detect collisions, or how not to pass through objects, so I created this example which also has an example of how one can sub-class my 'Bar' class to give it some functionality.

The robot (or man) has eight-way movement; meaning that you can use two arrows keys at one time to move diagonally (like 'up' and 'left'). Even with a little resistance in the direction of movement, the robot will 'slide' along the barrier. Maximizing the thickness of the barriers (clicking on the right, outside the Barrier Thickness bar) with the robot next to a barrier may 'trap' him. Better is to press and hold inside the bar on the right side (or move the robot away from any barriers before maximizing the thickness of the barriers).

@Sparky, oftentimes new programmers find that even though they put some kind of collision checking in their code, they still have problems with the actor passing by some barriers (usually when the speed of the object is quite fast and the barrier is quite thin). Although this scenario was intended to help in that situation, it is still possible to learn collision checking by examining its code.

Hey, this has been so useful for me but i have one thing i cant figure out which is on one side of the barrier i can get close to it and then on the other side it has a gap, do you have any solutions to this?