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# Rectangle Collision

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### #1walsh06  Members   -  Reputation: 184

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Posted 23 May 2012 - 11:52 AM

I am working on a simple game at the moment and Im currentyly trying to do the collision. The collision is done by the usual, creat two rectangles and check if they intersect. My question is, is there a way to tell which sides of the rectangles are intersecting?? As in to know which direction one sprite is moving into the other.

### #2dAND3h  Members   -  Reputation: 187

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Posted 26 May 2012 - 12:30 PM

Well, surely doing checks such as:

`if(rect1.y + rect1.height <= rect2.y && rect1.Intersects(rect2))`

Then in this instance rect1 is colliding to the top of rect2. I could be wrong though, these things can sometimes be deceptively simple

Another approach would be to have 1 large bounding rectangle, and 4 smaller rectangles representing his head/rhs/lhs/feet. The large rectangle would be a quick check to see if anything is likely to collide, then depending on which smaller rectangle it collides with, you make the appropriate reaction to it.

These smaller rectangle idea could be helpful for things like walking on a platform, you only want "Gravity" to stop if his feet are collding with something etc.

Edited by dAND3h, 26 May 2012 - 12:33 PM.

### #3walsh06  Members   -  Reputation: 184

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Posted 28 May 2012 - 11:21 AM

Ya I have it the first way but its difficult. And considering this is for a platformer your second idea seems quite good. Ill try it and see how it works. Thanks for the help.

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