รบกวนที่ครับรูปกราฟไม่ขึ้นอะครับ มันขึ้นรูปสี่เหลี่ยมเล็กๆบนมุมซ้ายครับ จะต้องแก้ไงครับ

 <?php        
       require_once  ('../jpgraph-3.5.0b1/src/jpgraph.php');
       require_once  ('../jpgraph-3.5.0b1/src/jpgraph_bar.php');
       require_once  ('../jpgraph-3.5.0b1/src/jpgraph_line.php');
       require_once  ('../jpgraph-3.5.0b1/src/jpgraph_error.php');
             
       $objConnect = mysql_connect("localhost","root","1234") or die ("Error connect to Database");
        $objDB = mysql_select_db("db_iservice");
        mysql_query("SET NAMES UTF8");
        $strSQL = "SELECT part_a,SUM(fix_price_a) AS part_a FROM requests GROUP BY part_a";
        $objQuery = mysql_query($strSQL) or die ("Error Query [".$strSQL."]");

  $xdata = array();
        $ydata = array();

while ($rs = mysql_fetch_array($objQuery)){ 

$xdata[] = $rs[part_a];
$ydata[] = $rs[fix_price_a];

}
//สร้างกราฟ
$graph = new Graph(960,2000);
$graph->SetMargin(40,70,20,40);
$graph->SetScale("textlin");
$graph->SetShadow();
$graph->SetColor(array(250,250,250));
$graph->img->SetTransparent("white");

//สร้าง bar plot
$bplot = new BarPlot($xdata);
$bplot->SetFillColor("orange");
$bplot->SetLegend("result");

//เพิ่ม plot ไปในกราฟ 
$graph->Add($bplot);

//สร้าง text
$txt = new Text('ทดสอบ');
$txt->SetPos(50,20);
$txt->SetColor('darkred');
$txt->SetFont(FF_ANGSA,FS_BOLD,15);
$txt->SetBox('white','navy','[email protected]');
$graph->AddText($txt);

$graph->title->Set("สรุปค่าใช้จ่ายทั้งหมด");
$graph->xaxis->title->Set("แกน X");
$graph->yaxis->title->Set("แกน Y");

$graph->title->SetFont(FF_ANGSA,FS_BOLD,20);
$graph->yaxis->title->SetFont(FF_ANGSA,FS_BOLD,20);
$graph->xaxis->title->SetFont(FF_ANGSA,FS_BOLD,20);

$graph->xaxis->SetTickLabels($ydata);
$graph->Stroke();
        ?>