php使用Jpgraph绘制饼状图的方法

<?php 
include ("src/jpgraph.php"); 
include ("src/jpgraph_pie.php"); 
$data = array(19,23,34,38,45,67,71,78,85,87,90,96); 
$graph = new PieGraph(400,300); 
$graph->SetShadow(); 
$graph->title->Set("年度收支表"); 
$graph->title->SetFont(FF_SIMSUN,FS_BOLD); 
$pieplot = new PiePlot($data); 
$graph->Add($pieplot); 
$graph->Stroke(); 
?>