jpgraph.php生成3D饼图

public function pietest() {
        require_once ("../src/jpgraph.php");
        require_once ("../src/jpgraph_pie.php");
        require_once ("../src/jpgraph_pie3d.php");
        $data = array(
            24,
            23,
            96,
            18
        );
        $graph = new PieGraph(300, 200);
        $graph->SetShadow();
        $graph->title->Set(mb_convert_encoding("用户消费报表图", "html-entities", "utf-8"));
        $graph->title->SetFont(FF_SIMSUN, FS_BOLD);
        $p1 = new PiePlot3D($data);
        $p1->SetSize(0.5);
        $p1->SetCenter(0.4);
        $p1->SetColor("red");
        $p1->SetLegends($gDateLocale->GetShortMonth());
        $graph->Add($p1);
        $graph->Stroke();
    }