From:	mert0407 AT sable DOT ox DOT ac DOT uk (George Foot)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: allegro problems (gfx + kb)
Date:	13 Mar 1997 09:11:09 GMT
Organization:	Oxford University, England
Message-ID:	<5g8gbd$3d0@news.ox.ac.uk>
References:	<199703122105 DOT VAA01257 AT post DOT dialin DOT co DOT uk>
NNTP-Posting-Host:	sable.ox.ac.uk
Lines:	63
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Lee Simons (lee AT dialin DOT co DOT uk) wrote:

[...]

: void draw()
: {
: 	putpixel(screen, pix.x, pix.y, 1);
: 	textout(screen, font, frames, SCREEN_W/2, SCREEN_H/2, 1);
: }
No, this won't work; textout only prints strings. One way to rewrite this
would be:

void draw()
{
 char s[10];
 putpixel(screen, pix.x, pix.y, 1);
 sprintf(s,"%d",frames);             // there are many functions which
                                     // work here; sprintf is slow but
                                     // very versatile
 textout(screen, font, s, SCREEN_W/2, SCREEN_H/2, 1);
}

[...]

: void check_kb()
: {
: 	int key, i;
: 	key = readkey();

I suggest that you shouldn't redefine the variable `key'; Allegro already
uses this to reference an array. While this is not an error, it does mean
you can't easily access the array from within this function.

: 	if((readkey() >> 8) == KEY_UP && pix.y != 0) 
: 		{
: 		for(i = 0; i < 2; i++)    
: 			pix.y--;
: 		}

[...]

Change the `readkey()' in all the conditions like this one to whatever you
change the `key variable to.

Example:

void check_kb()
{
 int key_read,i;
 key_read=readkey();

 if (((key_read>>8)==KEY_UP) && (pix.y != 200))
  for (i=0; i<2; i++) 
   pix.y++;

 if (((key_read>>8)==KEY_DOWN) && (pix.y != 200))
...

This way the program will only wait for one key to be pressed.

-- 
George Foot <mert0407 AT sable DOT ox DOT ac DOT uk>
Merton College, Oxford

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