JPGraph - เซทยังไงให้ขึ้นเป็นภาษาไทยคะ คือตอนนี้ทำให้ออกเปนภาษาไทยได้แล้ว แต่ว่ามันไม่ได้เป็นข้อความที่พิมพ์ลงไปอ่ะค่ะ

<?php 
require("../jpgraph/jpgraph.php"); //this is path of tool
require("../jpgraph/jpgraph_bar.php");
require("../jpgraph/jpgraph_flags.php");
include ("connect.php") ;

$sql1 = "select *from member order by username"; 
$result = mysql_query($sql1)
or die("query error 1 ".mysql_error()); 
$sumtotal = 0;

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

$xdata[] = $rs["username"];
$ydata[] = $rs["buy_totalprice"];

}

$graph = new Graph(350,450);
$graph->SetScale("textlin");
$graph->SetMarginColor('white');
$graph->SetBackgroundGradient("white","whitesmoke",GRAD_HOR, BGRAD_MARGIN);
$graph->SetShadow();
$graph->SetMargin(40,30,20,40);


$graph->title->SetFont(FF_TAHOMA, FS_BOLD,12);
$graph->title->Set(iconv('TIS-620','UTF-8',"รายงาน"));
$graph->subtitle->SetFont(FF_TAHOMA, FS_BOLD,12);
$graph->subtitle->Set(iconv('TIS-620','UTF-8',"รายงานลูกค้า"));

$graph->xaxis->title->Set("Username");
$graph->yaxis->title->Set("Bath");
$graph->xaxis->SetTickLabels($xdata);
$graph->SetMarginColor('white');
$graph->SetBackgroundGradient("white","whitesmoke",GRAD_HOR, BGRAD_MARGIN);

$bplot = new BarPlot($ydata);
$bplot->SetFillGradient('white','pink',GRAD_VERT);
$bplot->SetColor('gainsboro');
$bplot->SetWeight(1);
$bplot->value->Show();
$bplot->value->SetFont(FF_TAHOMA, FS_BOLD,8);
$bplot->value->SetAngle(45);

$graph->Add($bplot);

$graph->Stroke();
?>