PHP and Chess

**Matthias Esken** · Jul 17 '05, 12:49 AM

Re: PHP and Chess

"Michel" <MicheldeVathai re@wanadoo.fr> schrieb:
[color=blue]
> I am trying to display a position, on a chessboard, corresponding to a
> sequence of moves recorded in a MySql database.[/color]

PHP: imagecopy - Manual

http://www.php.net/manual/en/function.imagecopy.php

Copy part of an image

Regards,
Matthias

**Geoff Berrow** · Jul 17 '05, 12:50 AM

Re: PHP and Chess

I noticed that Message-ID: <bnpag4$ssq$1@n ews-reader3.wanadoo .fr> from
Michel contained the following:
[color=blue]
>I am trying to display a position, on a chessboard, corresponding to a
>sequence of moves recorded in a MySql database.
>Any clue?[/color]

Not sure If I understand the question but here goes.

If you have images of the pieces and an 8 by 8 table

<?php

function display($image) {
if(isset($image )){
$showpiece="<im g src=\"$image\" alt=\"\">";}
else{
$showpiece="emp ty";}
return $showpiece;
}
//information from database
$img=array();
$img[1][1]="rook_black.jp g";
$img[1][3]="rook_white.jp g";
$img[1][6]="king_white.jp g";
//etc, etc
?>

<table border="1" cellspacing="0" cellpadding="0" >
<tr align="center" valign="middle" >
<td width="50" height="50"><?p hp echo display($img[1][1]);
?></td>
<td width="50" height="50"><?p hp echo
display($img[1][2]);?></td>
<td width="50" height="50"><?p hp echo
display($img[1][3]);?></td>
<td width="50" height="50"><?p hp echo
display($img[1][4]);?></td>
<td width="50" height="50"><?p hp echo display($img[1][5]);
?></td>
<td width="50" height="50"><?p hp echo display($img[1][6]);
?></td>
<td width="50" height="50"><?p hp echo
display($img[1][7]);?></td>
<td width="50" height="50"><?p hp echo display($img[1][8]);
?></td>

</tr>
// and so on for another 7 rows
--
Geoff Berrow
It's only Usenet, no one dies.
My opinions, not the committee's, mine.
Simple RFDs http://www.ckdog.co.uk/rfdmaker/

**Michel** · Jul 17 '05, 12:50 AM

Re: PHP and Chess

Thanks for this, not sure it's what I'm looking for but interesting anyway

**Michel** · Jul 17 '05, 12:50 AM

Re: PHP and Chess

Hi Geoff

Ouaouh ! You did all that for me ! That sounds exactly what I'm looking for!
No time right now to work on it but I'll tell you as soon as I have made
some progerss
Meantime to get an idea of wht I'm working on 5 (for fun when I've some free
time) you can go there: http://mdevat.phpnet.org/echecs/seqmove.php
Also my main page is there http://perso.wanadoo.fr/mdv/ (click on Chess
image to get some interesting content (if you like chess...)
Michel

**Geoff Berrow** · Jul 17 '05, 12:51 AM

Re: PHP and Chess

I noticed that Message-ID: <bnrrak$kef$1@n ews-reader2.wanadoo .fr> from
Michel contained the following:
[color=blue]
>
>Ouaouh ! You did all that for me ! That sounds exactly what I'm looking for!
>No time right now to work on it but I'll tell you as soon as I have made
>some progerss[/color]

It was an interesting problem. I'm just a beginner myself and find that
working on problems like this helps me learn. :-)

--
Geoff Berrow
It's only Usenet, no one dies.
My opinions, not the committee's, mine.
Simple RFDs http://www.ckdog.co.uk/rfdmaker/

**Justin Koivisto** · Jul 17 '05, 12:51 AM

Re: PHP and Chess

Geoff Berrow wrote:[color=blue]
> I noticed that Message-ID: <bnrrak$kef$1@n ews-reader2.wanadoo .fr> from
> Michel contained the following:
>[color=green]
>>Ouaouh ! You did all that for me ! That sounds exactly what I'm looking for!
>>No time right now to work on it but I'll tell you as soon as I have made
>>some progerss[/color]
>
> It was an interesting problem. I'm just a beginner myself and find that
> working on problems like this helps me learn. :-)[/color]

You'll find that there a lot of people in here that do the same. In
fact, if I wasn't so busy, I'd have done the same. It's a very effective
way of learning different aspects of PHP and programming. (When it's
someone else's problem that is...) ;)

--
Justin Koivisto - spam@koivi.com
PHP POSTERS: Please use comp.lang.php for PHP related questions,
alt.php* groups are not recommended.

**Michel** · Jul 17 '05, 12:53 AM

Re: PHP and Chess

An other thing: How to erase the content of a square (after a piece has left
this square) ?

with your example, I tried this:

$img[i][j]="" but then I get an x in the square (image not known)

I can also do something like:

//
<td width="40" bgcolor="#CDCFD 3" align="center">
<?php
if ($img[3][1]!= "")
{
echo display($img[3][1]);
}
?>
<td width="40" bgcolor="#00339 9" align="center">
<?php
if ($img[3][2]!="")
{
echo display($img[3][2]);
}
?>
//

bit il looks very cumbersome (at least not elegant)

Michel

**Geoff Berrow** · Jul 17 '05, 12:53 AM

Re: PHP and Chess

I noticed that Message-ID: <bo3m1t$v5c$1@n ews-reader1.wanadoo .fr> from
Michel contained the following:
[color=blue]
>An other thing: How to erase the content of a square (after a piece has left
>this square) ?
>
>with your example, I tried this:
>
>$img[i][j]="" but then I get an x in the square (image not known)[/color]

It all depends on how you are storing the information about the moves.
In my example, I assumed that the information in the database would be
parsed in such a way as to returning all the information on where the
pieces were e.g,
$img=array();
$img[1][1]="rook_black.jp g";
$img[1][3]="rook_white.jp g";
$img[1][6]="king_white.jp g";
//etc, etc.

(It's possibly confusing to call this variable $img because it's really
a position corresponding to a square on the board.)

Then each square calls the function

<td width="50" height="50">
<?php echo display($img[1][1]); ?></td>
<td width="50" height="50">
<?php echo display($img[1][2]);?></td>
<td width="50" height="50">
<?php echo display($img[1][3]);?></td>

//etc. etc.

The function checks if the array position is set

function display($image) {
if(isset($image )){

//if it is set, we display the chesspiece image

$showpiece="<im g src=\"$image\" alt=\"\">";}
else{

//if it isn't set, we display the word 'empty'

$showpiece="emp ty";}
return $showpiece;
}
end of function.

If you just want blank square simply change this to
$showpiece="";

see www.ckdog.co.uk/php/test/chess.php (with more suitable images of
course)

To do any more on this I'll have to know how you are storing the moves
in the database.

--
Geoff Berrow
It's only Usenet, no one dies.
My opinions, not the committee's, mine.
Simple RFDs http://www.ckdog.co.uk/rfdmaker/

**Michel** · Jul 17 '05, 12:53 AM

Re: PHP and Chess

In fact I retrieve 2 sequences of white and black moves from 2 (serialized)
fields of a row of a table, then I convert them (unserialize) into 2 arrays:
$tabwhite and $tablack
Note that these arrays do not contain all pieces positions but only a few
opening moves like:
$tabwhite[1][1] = "c2c4"
$tabwhite[1][2] = "Ng1f3"
$tabblack[1][1] = "Ng8f6"
$tabwhite[1][2] = "e7e6"

If I take first move (c2c4), I can find out that I must put a pawn in c4
i.e. $img[5][3]="pawn.gif" but I don't see how to remove this pawn from c2
That's why I tried with $img[7][3]="" but it does not work.
May be what you say now about $showpiece="" is the solution but I don't well
understand how it works.

Note that the link that you mentioned: www.ckdog.co.uk/php/test/chess.php
does not work, chess.php is not there...

Thanks again for your help

"Geoff Berrow" <blthecat@ckdog .co.uk> a écrit dans le message de
news:di4bqvc6c0 lb2u60amvov6m9e v5e008caa@4ax.c om...[color=blue]
> I noticed that Message-ID: <bo3m1t$v5c$1@n ews-reader1.wanadoo .fr> from
> Michel contained the following:
>[color=green]
> >An other thing: How to erase the content of a square (after a piece has[/color][/color]
left[color=blue][color=green]
> >this square) ?
> >
> >with your example, I tried this:
> >
> >$img[i][j]="" but then I get an x in the square (image not known)[/color]
>
> It all depends on how you are storing the information about the moves.
> In my example, I assumed that the information in the database would be
> parsed in such a way as to returning all the information on where the
> pieces were e.g,
> $img=array();
> $img[1][1]="rook_black.jp g";
> $img[1][3]="rook_white.jp g";
> $img[1][6]="king_white.jp g";
> //etc, etc.
>
> (It's possibly confusing to call this variable $img because it's really
> a position corresponding to a square on the board.)
>
> Then each square calls the function
>
> <td width="50" height="50">
> <?php echo display($img[1][1]); ?></td>
> <td width="50" height="50">
> <?php echo display($img[1][2]);?></td>
> <td width="50" height="50">
> <?php echo display($img[1][3]);?></td>
>
> //etc. etc.
>
> The function checks if the array position is set
>
> function display($image) {
> if(isset($image )){
>
> //if it is set, we display the chesspiece image
>
> $showpiece="<im g src=\"$image\" alt=\"\">";}
> else{
>
> //if it isn't set, we display the word 'empty'
>
> $showpiece="emp ty";}
> return $showpiece;
> }
> end of function.
>
> If you just want blank square simply change this to
> $showpiece="";
>
> see www.ckdog.co.uk/php/test/chess.php (with more suitable images of
> course)
>
> To do any more on this I'll have to know how you are storing the moves
> in the database.
>
> --
> Geoff Berrow
> It's only Usenet, no one dies.
> My opinions, not the committee's, mine.
> Simple RFDs http://www.ckdog.co.uk/rfdmaker/[/color]

PHP and Chess

PHP and Chess

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