Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: mperdue@iquest.net (Mario Perdue)
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: autofire
Date: Sat, 14 Jun 1997 01:12:34 GMT
Organization: SCEA Net Yaroze News
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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,

If you look at the code for Spaceguy, you'll notice that I do what
you're wanting to do. It looks something like this:

void FireLaser()
  {
  static char button;
  int i;

  // Check to see if the 'fire' button is pressed
  if(contState & PADRdown)
    {
    // If button = 1 the fire button is still being held
    // down for the last time the laser was fired. - Abort
    if(button)
      return;

    // If button = 0, set it to 1 and continue processing
    button = 1;

    ....
    Do whatever you want here
    ....
    }
  else
    {
    // If the 'fire button is not pressed, button = 0
    button = 0;
  }

In this example, 'contState' contains the state of the controller
buttons. The variable 'button' is a flag that is set whenever the the
fire button is pressed and cleared when the fire button is released.
Whenever the fire button is pressed AND 'button' is set the function
returns without doing anything.

Mario