โค๊ดออกรายงานกราฟ อยากให้ข้อความที่ดีงมามันเป็นแนวเฉียง ปรับแก้โค๊ดยังไงคะ

<?php

include_once("../jpgraph/src/jpgraph.php");
include_once("../jpgraph/src/jpgraph_bar.php");
include_once("../jpgraph/src/jpgraph_flags.php");
include_once ("../dbconnect.php");

$sql = "SELECT * , SUM(net) AS sum, major_name
FROM paymentextra_load
LEFT JOIN personnel ON paymentextra_load.per_id = personnel.per_id
LEFT JOIN position_technical ON personnel.position_idtec = position_technical.position_idtec
LEFT JOIN major ON personnel.major_id = major.major_id
LEFT JOIN sort ON major.sort_id = sort.sort_id
WHERE sort.sort_id=$s AND paymentextra_load.status=3 AND paymentextra_load.term=$t AND paymentextra_load.year=$y
GROUP BY major_name";

$result = mysql_query($sql) or die("query error 1 ".mysql_error()); 
while ($rs = mysql_fetch_array($result)){ 
$ydata[] = $rs["sum"];
$xdata[] =  iconv('TIS-620', 'UTF-8', $rs["major_name"]);
}

$graph = new Graph(1000,900);
$graph->SetScale("textlin");
$graph->SetMarginColor('white');
$graph->SetBackgroundGradient("white","whitesmoke",GRAD_HOR, BGRAD_MARGIN);
$graph->SetShadow();
$graph->SetMargin(200,100,100,300);

$graph->title->Set("กราฟแสดงรายงานยอดเงินค่าสอนพิเศษ");
$graph->title->SetFont(FF_ANGSA,FS_BOLD,25);
$graph->subtitle->Set("แบบ EXTRA-LOAD");
$graph->subtitle->SetFont(FF_ANGSA,FS_BOLD,25);


//$graph->xaxis->title->Set("สาขา");
$graph->xaxis->title->SetFont(FF_ANGSA,FS_BOLD,18);
//$graph->yaxis->title->Set("บาท");
$graph->yaxis->title->SetFont(FF_ANGSA,FS_BOLD,18);
$graph->xaxis->SetTickLabels($xdata);
$graph->xaxis->SetLabelAngle(45);  // ตรงนี้ทำให้ข้อมูลเป็นแนวเฉียงนะคะ
$graph->xaxis->SetFont(FF_ANGSA,FS_NORMAL,15);
$graph->SetMarginColor('white');
$graph->SetBackgroundGradient("white","whitesmoke",GRAD_HOR, BGRAD_MARGIN);

$bplot = new BarPlot($ydata);
$bplot->SetFillGradient('white','orchid',GRAD_VERT);
$bplot->SetColor('gainsboro');
$bplot->SetWeight(1);
$bplot->value->Show();
$bplot->value->SetFont(FF_ANGSA,FS_BOLD,15);
$bplot->value->SetAngle(45);

$graph->Add($bplot);

$graph->Stroke();
?>