CRÉATION D'UNE IMAGE DE STATISTIQUE : LE CAMEMBERT

<?


if(isset($_GET['id1']) && isset($_GET['id2']) && isset($_GET['id3']) && isset($_GET['id4']) && isset($_GET['id5']) && isset($_GET['pid1']) && isset($_GET['pid2']) && isset($_GET['pid3']) && isset($_GET['pid4']) && isset($_GET['pid5']))
{

    /*
    ** Graphique sectoriel au format GIF
    */


    /*
    ** Convertir les degrés en radians
    */
    function radians($degrees)
    {
        return($degrees * (pi()/180.0));
    }

    /*
    ** prendre x,y dans le cercle,
    ** centre = 0,0
    */
      function circle_point($degrees, $diameter)
      {
        $x = cos(radians($degrees)) * ($diameter/2);
        $y = sin(radians($degrees)) * ($diameter/2);

        return (array($x, $y));
      }


    //remplir les paramètres
    $ChartDiameter = 300;
    $ChartFont = 5;
    $ChartFontHeight = imagefontheight($ChartFont);
	$ChartData = array($_GET['id1'], $_GET['id2'],
        $_GET['id3'], $_GET['id4'], $_GET['id5']);
    $ChartLabel = array($_GET['pid1'], $_GET['pid2'],
        $_GET['pid3'], $_GET['pid4'], $_GET['pid5']);


    //déterminer la taille du graphique
    $ChartWidth = $ChartDiameter + 20;
    $ChartHeight = $ChartDiameter + 20 +
        (($ChartFontHeight + 2) * count($ChartData));

	$ChartTotal = "";	

    //détermine le total de toutes les valeurs
    for($index = 0; $index < count($ChartData); $index++)
    {
        $ChartTotal += $ChartData[$index];
    }

    $ChartCenterX = $ChartDiameter/2 + 10;
    $ChartCenterY = $ChartDiameter/2 + 10;


    //image
    $image = imagecreate($ChartWidth, $ChartHeight);

    //couleurs
    $colorBody = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
    $colorBorder = imagecolorallocate($image, 0x00, 0x00, 0x00);
    $colorText = imagecolorallocate($image, 0x00, 0x00, 0x00);

    $colorSlice[] = imagecolorallocate($image, 0xFF, 0x00, 0x00);
    $colorSlice[] = imagecolorallocate($image, 0x00, 0xFF, 0x00);
    $colorSlice[] = imagecolorallocate($image, 0x00, 0x00, 0xFF);
    $colorSlice[] = imagecolorallocate($image, 0xFF, 0xFF, 0x00);
    $colorSlice[] = imagecolorallocate($image, 0xFF, 0x00, 0xFF);
    $colorSlice[] = imagecolorallocate($image, 0x00, 0xFF, 0xFF);
    $colorSlice[] = imagecolorallocate($image, 0x99, 0x00, 0x00);
    $colorSlice[] = imagecolorallocate($image, 0x00, 0x99, 0x00);
    $colorSlice[] = imagecolorallocate($image, 0x00, 0x00, 0x99);
    $colorSlice[] = imagecolorallocate($image, 0x99, 0x99, 0x00);
    $colorSlice[] = imagecolorallocate($image, 0x99, 0x00, 0x99);
    $colorSlice[] = imagecolorallocate($image, 0x00, 0x99, 0x99);

    //arrière-plan
    imagefill($image, 0, 0, $colorBody);


    /*
    ** Dessiner chaque portion
    */
    $Degrees = 0;
    for($index = 0; $index < count($ChartData); $index++)
    {
        $StartDegrees = round($Degrees);
        $Degrees += (($ChartData[$index]/$ChartTotal)*360);
        $EndDegrees = round($Degrees);

        $CurrentColor = $colorSlice[$index%(count($colorSlice))];

        //dessiner un arc
        imagearc($image,
            $ChartCenterX,
            $ChartCenterY,
            $ChartDiameter,
            $ChartDiameter,
            $StartDegrees,
            $EndDegrees,
            $CurrentColor);

        //Tracer le début de la ligne à partir du centre
        list($ArcX, $ArcY) = circle_point($StartDegrees, $ChartDiameter);
        imageline($image,
            $ChartCenterX,
            $ChartCenterY,
            floor($ChartCenterX + $ArcX),
            floor($ChartCenterY + $ArcY),
            $CurrentColor);


        //dessiner la fin de la ligne
        list($ArcX, $ArcY) = circle_point($EndDegrees, $ChartDiameter);
        imageline($image,
            $ChartCenterX,
            $ChartCenterY,
            ceil($ChartCenterX + $ArcX),
            ceil($ChartCenterY + $ArcY),
            $CurrentColor);

        //remplir les portions
        $MidPoint = round((($EndDegrees - $StartDegrees)/2) +  $StartDegrees);
        list($ArcX, $ArcY) = circle_point($MidPoint, $ChartDiameter/2);
        imagefilltoborder($image,
            floor($ChartCenterX + $ArcX),
            floor($ChartCenterY + $ArcY),
            $CurrentColor,
            $CurrentColor);

    }


    //la bordure
    imagearc($image,
        $ChartCenterX,
        $ChartCenterY,
        $ChartDiameter,
        $ChartDiameter,
        0,
        180,
        $colorBorder);

    imagearc($image,
        $ChartCenterX,
        $ChartCenterY,
        $ChartDiameter,
        $ChartDiameter,
        180,
        360,
        $colorBorder);


    imagearc($image,
        $ChartCenterX,
        $ChartCenterY,
        $ChartDiameter+7,
        $ChartDiameter+7,
        0,
        180,
        $colorBorder);

    imagearc($image,
        $ChartCenterX,
        $ChartCenterY,
        $ChartDiameter+7,
        $ChartDiameter+7,
        180,
        360,
        $colorBorder);


    imagefilltoborder($image,
        floor($ChartCenterX +  ($ChartDiameter/2) +  2),
        $ChartCenterY,
        $colorBorder,
        $colorBorder);


    //la légende
    for($index = 0; $index < count($ChartData); $index++)
    {
        $CurrentColor = $colorSlice[$index%(count($colorSlice))];
        $LineY = $ChartDiameter + 20 +  ($index*($ChartFontHeight+2));

        //la couleur des boîtes
        imagerectangle($image,
            10,
            $LineY,
            10 + $ChartFontHeight,
            $LineY+$ChartFontHeight,
            $colorBorder);

        imagefilltoborder($image,
            12,
            $LineY + 2,
            $colorBorder,
            $CurrentColor);

        //Les titres
        imagestring($image,
            $ChartFont,
            20 + $ChartFontHeight,
            $LineY,
            "$ChartLabel[$index]: $ChartData[$index]",
            $colorText);


    }


    //afficher l'image
    header("Content-type: image/gif");
    imagegif($image);

}else{


	echo '<fieldset style="position:absolute;border-color:#0000FF;border:1 solid"><b>Une erreur c\'est produite lors de la création du graphique :<br><li><font color=red>Tout les Arguments ne sont pas spécifier</b></font></fieldset>';


}


?>