Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: jamin1@psu.edu (Jamin Frederick)
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: autofire
Date: Sat, 14 Jun 1997 03:31:40 GMT
Organization: SCEA Net Yaroze News
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	Here's the way I do it:

I have an extra variable that keeps track of the last buttons
being pushed, call it LastPadRead;  This is an unsigned long,
just like the regular pad-reading type.  But make sure you use
STATIC, so that the variable remains unchanged:

static u_long LastPadRead = 0;  //the previous read (initially zero)
u_long PadRead; //the current read
	
PadRead = PadReadFunction();  //returns u_long (the pushed buttons)

if(PadRead & PAD1_UP) 
  if(!(LastPadRead & PAD1_UP))
	do your UP thing -- only if both UP is currently being pushed
and it wasn't pushed last time

if(PadRead & PAD1_DOWN) 
  if(!(LastPadRead & PAD1_DOWN))
	do your DOWN thing -- only if both UP is currently being
pushed and it wasn't pushed last time

...other directions and buttons...

LastPadRead = PadRead;  //set the LastPadRead so that next time,
// the logic won't be done unless the user has let go
// end of pad read function

don't take the code verbatim...



Jamin Frederick


On Thu, 12 Jun 1997 19:48:32 -0400, djinn666 <djinn666@concentric.net>
wrote:

>hi,
>
> i'm writing a game but everytime the user holds the fire button it
>keeps on shooting. i was wondering if anyone knows how i could make it
>so when the user holds down the fire button the ship will only fire
>once, making it so they must continuelly press the button to fire.
>in the code the bullets are actually from "gsline" and go to the end of
>the screen.
>
>-Djinn