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  Collision  (Read 1640 times)
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Senior Newbie

« Posted 2011-05-29 14:59:47 »

Hey Community,

i have a question about Collision.
How can you determine what sides of a Rectangle intersect with the other Rectangle.
Or is there another way to determine if you get killed or kill the enemy (e.g. Mario).

Cant find it anywhere.

Thx for helping.
Offline dapy
« Reply #1 - Posted 2011-05-29 17:43:27 »

I guess you want something like the following:

- if player hits top of enemy, then kill enemy
- if player hits side or bottom of enemy, then kill player

I assume you are already using a standard rectangle intersection check to determine if player + enemy collide.
If they do collide, then you can compare previous and current positions of the player's bottom edge, with the previous and current positions of the enemy's top edge. A bit like this in pseudo code:

if (player collides with enemy) and (player.previous.bottom.y was above and (player.bottom.y is below
    player has hit top of enemy, so kill enemy
    player has hit left, right or bottom of enemy, so kill player

Note that this isn't completely accurate, but it's quite simple to code and has always worked well enough for me.

Senior Newbie

« Reply #2 - Posted 2011-05-29 18:47:47 »

Ok thank you i will try that tomorrow.
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Offline Eli Delventhal

JGO Kernel

Medals: 42
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Game Engineer

« Reply #3 - Posted 2011-05-30 05:59:00 »

Just check the distance along the Y from the player's bottom to the enemy's top. If it's within a small enough margin then he is considered to have bounced on top. You may also want to check X distance along each of the player's and enemy's sides, but I didn't do this as I like to make things more in the player's favor.

See my work:
OTC Software
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