Path: chuka.playstation.co.uk!news
From: Tones <caz.tones@cwcom.net>
Newsgroups: scee.yaroze.programming.2d_graphics
Subject: Re: Boundaries still don't work
Date: Fri, 06 Nov 1998 17:21:22 +0000
Organization: PlayStation Net Yaroze (SCEE)
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Omar Metwally wrote:

> I tried to put boundaries to the screen, and it failed.  Craig told me to
> put:
>
> if (TestSprite.x > (320-17)
>     TestSprite.x=320-17;
> if(TestSprite.y > (240-17))
>     TestSprite.y = 240-17;
>
> Well, this worked, but only for the bottom and the right side of the
> screen.  What about the top and left side of the screen???


Hello Omar,

Right, if you haven't worked it out yet, here is a suggestion :

Firstly, at the beginning of the check store the sprites position into two
variables (Ie Player1x, Player1y).

Now do the check (something like this ) :

int Player1x = TestSprite.x, Player1y = TestSprite.y;

if ((TestSprite.x > (320-17)) | (TestSprite.x < (0+17)))
    TestSprite.x = Player1x;              //This will restore the players
position
if ((TestSprite.y > (240-17)) | (TestSprite.x < (0+17)))
    TestSprite.y = Player1y;

Basically all it is doing is testing 2 conditions on each pass - and if they
are true, it'll
leave the player where he is.  This will sort out the problem of testing all
sides of the screen.

Hope this helps


Tones 8)