File "ajax_probabilite.php"
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MIME-type: text/x-php
Charset: utf-8
<?php
session_start();
include('database.php');
DB_connexion();
/****************************************************************************/
// Calcul de la probabilité de gagner du joueur J1
function estimation($elo_1, $elo_2)
{
$exp = ($elo_2 - $elo_1) / 400;
return (1/ (1 + pow(10,$exp)));
}
/****************************************************************************/
// Calcul de la nouvelle cote du joueur J1
function calcul_elo_J1($elo_1, $elo_2, $score)
{
$k = facteur_k($elo_1);
$estimation = estimation($elo_1, $elo_2);
$nouveau_rang = $elo_1 + $k * ($score - $estimation);
// si la cote devient trop petite < 300, on la clamp à cette valeur
if ($nouveau_rang < 300)
{
$nouveau_rang = 300;
}
return array($nouveau_rang, $estimation);
}
/****************************************************************************/
// valeur de K en fonction de la cote du joueur
function facteur_k($elo)
{
if($elo < 1000)
{
$k = 80;
}
if($elo >= 1000 AND $elo < 2000)
{
$k = 50;
}
if ($elo >= 2000 AND $elo <= 2400)
{
$k = 30;
}
if ($elo > 2400)
{
$k = 20;
}
return $k;
}
/****************************************************************************/
/*
// Calcul des nouvelles cotes de P1 et P2
// score = 1 si P1 gagne
// score = 0 si P1 perd
// score = 0.5 s'il y a match nul
*/
function nouveau_rangs($elo_1, $elo_2, $score)
{
// Score pour P2 VS P1
$score_2 = 1 - $score;
$calcul_J1 = calcul_elo_J1($elo_1, $elo_2, $score);
$estimation_J1 = $calcul_J1[1];
$elo_J1 = round($calcul_J1[0]);
$calcul_J2 = calcul_elo_J1($elo_2, $elo_1, $score_2);
$estimation_J2 = $calcul_J2[1];
$elo_J2 = round($calcul_J2[0]);
return array($elo_J1, $elo_J2, $estimation_J1, $estimation_J2);
}
/****************************************************************************/
function afficher_difference($nb)
{
if ($nb >= 0)
{
$nb = '+'.$nb;
}
return $nb;
}
/****************************************************************************/
function convertir_pourcentage($nb)
{
return round($nb * 100, 2).' %';
}
/****************************************************************************/
function resultat_partie($score)
{
if($score == 1)
{
return 'J1 gagne';
}
if($score == 0)
{
return 'J2 gagne';
}
if ($score == 0.5)
{
return 'Match nul';
}
}
/****************************************************************************/
if(isset($_POST["J1"]) && isset($_POST["J2"]) )
{
$J1_nom = $_POST["J1"];
$J2_nom = $_POST["J2"];
}
//ddd
//mysql_connect("localhost","root","");
//mysql_select_db("website");
$sql = "SELECT * FROM joueurs WHERE nom = '".$J1_nom."' ";
$results = mysql_query($sql);
$val = mysql_fetch_array($results);
$J1_score_elo = $val['score'];
$sql = "SELECT * FROM joueurs WHERE nom = '".$J2_nom."' ";
$results = mysql_query($sql);
$val = mysql_fetch_array($results);
$J2_score_elo = $val['score'];
// score = 1 si P1 gagne
// score = 0 si P1 perd
// score = 0.5 s'il y a match nul
$score = 0;
/****************************************************************************/
// Traitement des résultats
/*$retour = nouveau_rangs($J1_score_elo, $J2_score_elo, $score);
$elo_J1 = $retour[0];
$elo_J2 = $retour[1];
$estimation_J1 = $retour[2];
$estimation_J2 = $retour[3];
$difference_J1 = afficher_difference($elo_J1 - $J1_score_elo);
$difference_J2 = afficher_difference($elo_J2 - $J1_score_elo);*/
/****************************************************************************/
/****************************************************************************/
/****************************************************************************/
echo '
<h3>côte initiale</h3>
Joueur1 : '.$J1_score_elo.'<br>
Joueur2 : '.$J2_score_elo.'<br>
<br/>
<hr />
<br />';
$retour = nouveau_rangs($J1_score_elo, $J2_score_elo, 1);
$elo_J1 = $retour[0];
$elo_J2 = $retour[1];
$estimation_J1 = $retour[2];
$estimation_J2 = $retour[3];
//$difference_J1 = afficher_difference($elo_J1 - $J1_score_elo);
//$difference_J2 = afficher_difference($elo_J2 - $J1_score_elo);
$s1 = "J1 Probabilité de gagner : ";
$s2 = convertir_pourcentage($estimation_J1) .'<br>';
echo $s1 .' ' .$s2;
$s1 = "J2 Probabilité de gagner : ";
$s2 = convertir_pourcentage($estimation_J2) .'<br>';
echo $s1 .' ' .$s2;
echo '<br>';
/************************************************************/
echo "Si J1 gagne";
echo '<br>';
$difference_J1 = abs($J1_score_elo - $elo_J1);
$difference_J2 = abs($J2_score_elo - $elo_J2);
echo 'J1 : '.$elo_J1.' (variation : '.$difference_J1.').<br>';
echo 'J2 : '.$elo_J2.' (variation : '.$difference_J2.').<br>';
echo '<br>';
$_SESSION['$J1_gagne_score'] = $elo_J1;
$_SESSION['$J2_perd_score'] = $elo_J2;
/************************************************************/
// J2 gagne
$retour = nouveau_rangs($J1_score_elo, $J2_score_elo, 0);
$elo_J1 = $retour[0];
$elo_J2 = $retour[1];
$estimation_J1 = $retour[2];
$estimation_J2 = $retour[3];
$difference_J1 = afficher_difference($elo_J1 - $J1_score_elo);
$difference_J2 = afficher_difference($elo_J2 - $J1_score_elo);
echo '<br>';
echo "Si J2 gagne";
echo '<br>';
$difference_J1 = abs($J1_score_elo - $elo_J1);
$difference_J2 = abs($J2_score_elo - $elo_J2);
echo 'J1 : '.$elo_J1.' (variation : '.$difference_J1.').<br>';
echo 'J2 : '.$elo_J2.' (variation : '.$difference_J2.').<br>';
echo '<br>';
$_SESSION['$J1_perd_score'] = $elo_J1;
$_SESSION['$J2_gagne_score'] = $elo_J2;
/************************************************************/
echo "Si match nul";
echo '<br>';
echo 'J1 : '.$J1_score_elo.' (variation : 0).<br>';
echo 'J2 : '.$J2_score_elo.' (variation : 0).<br>';
echo '<br>';
// echo "Si J2 gagne";
// echo '<br>';
// J1 perds
// $retour = nouveau_rangs($J1_score_elo, $J2_score_elo, 0);
// $elo_J1 = $retour[0];
// $elo_J2 = $retour[1];
// $estimation_J1 = $retour[2];
// $estimation_J2 = $retour[3];
// $difference_J1 = afficher_difference($elo_J1 - $J1_score_elo);
// $difference_J2 = afficher_difference($elo_J2 - $J1_score_elo);
// echo 'J1 : '.$elo_J1.' (variation : '.$difference_J1.').<br>';
// echo 'J2 : '.$elo_J2.' (variation : '.$difference_J2.').<br>';
// echo '<br>';
// $_SESSION['$J1_perd_score'] = $elo_J1;
// $_SESSION['$J2_gagne_score'] = $elo_J2;
// echo "Si match nul";
// echo '<br>';
// $retour = nouveau_rangs($J1_score_elo, $J2_score_elo, 0.5);
// $elo_J1 = $retour[0];
// $elo_J2 = $retour[1];
// $estimation_J1 = $retour[2];
// $estimation_J2 = $retour[3];
// $difference_J1 = afficher_difference($elo_J1 - $J1_score_elo);
// $difference_J2 = afficher_difference($elo_J2 - $J1_score_elo);
// echo 'J1 : '.$elo_J1.' (variation : '.$difference_J1.').<br>';
// echo 'J2 : '.$elo_J2.' (variation : '.$difference_J2.').<br>';
// echo '<br>';
$_SESSION['$J1_match_nul'] = $J1_score_elo;
$_SESSION['$J2_match_nul'] = $J2_score_elo;
$_SESSION['$J1_nom'] = $J1_nom;
$_SESSION['$J2_nom'] = $J2_nom;
?>