Re: 2d game problem

["Frag_ Daddy" <frag_daddy_@hotmail.com>]

     You'd use bounding boxes for the character.  Basically, it's a box that 
encompasses the whole character.  Then when it comes time to check the 
collisions against the other players, you'd do something like this:

X1,Y1 is the first box's lower left and upper right corners.
X2,Y2 is the second box's lower left and upper right corners.

if(X1 >= X2 && X1 <= X2)
{
     if(Y1 >= Y2 && Y1 <= Y2
     {
        We have a collision if we're here.
     }
}

    Also, we need to check the boxes against each other in the other way... 
to make sure we didn't miss anything like this

else if(X2 >= X1 && X2 <= X1)
{
     if(Y2 >= Y1 && Y2 <= Y1
     {
        We have a collision if we're here.
     }
}

     This works for the character to character collisions, but you probably 
also want to do collisions against the ground with all kinds of hills and 
everything.  That would take quite awhile, though, so I'm not going to do it 
here.  Anyways, there's lots of tutorials on collision detection on the web, 
I just wrote one the other day even 
(http://shockonline.homestead.com/openglgameprogramming.html).  Also check 
out Flipcode and GameDev.






>From: "Frank Cleynen" <frankcleynen@freegates.be>
>Reply-To: gameprogrammer@gameprogrammer.com
>To: <gameprogrammer@gameprogrammer.com>
>Subject: 2d game problem
>Date: Fri, 14 Jul 2000 19:35:52 +0200
>
>Default Outlook Express Briefpapier.Hey!!
>My problem: I'm still working on a 2D game and my question is: how can I 
>program that my maincharackter doesn't walk trough houses, trees, other 
>charackters and objects???
>
>Bye and thanks!!

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