ผมอยากให้ jpgraph แสดงแบบเป็นกลุ่มและรวมค่าครับ ผมต้องทำไงครับ(ขอบคุณครับ)

CREATE TABLE `test` (
  `test_id` int(3) unsigned NOT NULL auto_increment,
  `test_name` varchar(30) collate utf8_unicode_ci NOT NULL,
  `test_num` int(5) unsigned NOT NULL,
  PRIMARY KEY  (`test_id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=8 ;

-- 
-- dump ตาราง `test`
-- 

INSERT INTO `test` VALUES (1, 'AAA', 2);
INSERT INTO `test` VALUES (2, 'AAA', 8);
INSERT INTO `test` VALUES (4, 'BBB', 5);
INSERT INTO `test` VALUES (5, 'CCC', 8);
INSERT INTO `test` VALUES (6, 'AAA', 4);
INSERT INTO `test` VALUES (7, 'CCC', 6);

<?php
@mysql_connect("localhost", "root", "1234") or die(mysql_error());
mysql_select_db("test_graph");

$sql = "SELECT* FROM test;";
$result = mysql_query($sql);

include("JpGraph/src/jpgraph.php");
include("JpGraph/src/jpgraph_pie.php");

$g = new PieGraph(500, 500);

$title = iconv("tis-620", "utf-8", "ทดสอบกราฟวงกลม");
$g->title->Set($title);
$g->title->SetFont(FF_JASMINE, FS_BOLD, 18);

$legends = array();
$data_graph = array();
while($data = mysql_fetch_array($result)) {
	$lg = iconv("tis-620", "utf-8", $data['test_name']);
	array_push($legends, $lg);
	array_push($data_graph, $data['test_num']);
}

$pie = new PiePlot($data_graph);
$pie->SetLegends($legends);

$g->Add($pie);
$g->Stroke();
?>