<?
$filename=$_GET["file"];
$largura=(int) $_GET["x"];
$comprimento=(int) $_GET["y"];
if (file_exists($filename)){
	list($width, $height, $tipo) = getimagesize($filename);
	if ($largura==0) $largura=$width;
	if ($comprimento==0) $comprimento=$height;
	if ($width<$largura && $height<$comprimento){
		$newwidth=$width;
		$newheight=$height;
	}elseif ($width/$height>$largura/$comprimento){//largura
		$newwidth = $largura;
		$newheight = round($newwidth / ($width/$height));
	}else{//comprimento
		$newheight = $comprimento;
		$newwidth = round($newheight * ($width/$height));
	}
	$tempfile=str_replace(".gif",".jpg",'tempimage/'.$newheight.'X'.$newwidth.'_'.substr(strrchr($filename, '/'),1));
	if (!file_exists($tempfile)){
		$ext=strtolower(strrchr($filename, '.'));
		if ($tipo!=1){
			$thumb = @imagecreatetruecolor($newwidth, $newheight);
		}else{
			$thumb = @imagecreate($newwidth, $newheight);
		}
		switch ($tipo){
			case "2":$source = @imagecreatefromjpeg($filename);	break;
			case "1":$source = @imagecreatefromgif($filename);	break;
			case "6":$source = @imagecreatefromwbmp($filename);	break;
			case "3":$source = @imagecreatefrompng($filename);	break;
		}
		imagecopyresized($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
		imagejpeg($thumb,$tempfile,90);
		imagedestroy($thumb);
		imagedestroy($source);
	}
	header("Expires: ".gmdate("D, d M Y H:i:s",time()+(60*60*24))." GMT");
	//header("Last-Modified: " . gmdate("D, d M Y H:i:s",time()-(60*60*24)) . " GMT");
	header("Content-Type: image/jpeg");
	readfile($tempfile);
}else{
	echo "ficheiro não existe";
	echo $filename;
	echo $largura;
	echo $comprimento;
}
?>