php JbGraph

<?phpheader ( "Content-type: text/html; charset=UTF-8" ); //设置文件编码格式include ("jpgraph/jpgraph.php");include ("jpgraph/jpgraph_line.php");$conn = mysql_connect('localhost','root','') or die('数据库连接失败');mysql_select_db('db_test9') or die('数据库不存在');mysql_query('set names utf8');$sql = 'select a.xm,b.cj from tb_stuinf a, tb_grade b where km="数学" and a.xh=b.xh';$r = mysql_query($sql);$x = array();$y = array();while($row = mysql_fetch_array($r)){$x[] = iconv("utf-8","gb2312",$row['xm']);$y[] = $row['cj'];}$graph = new Graph(450,275);//创建图像$graph->SetMargin(40,40,40,50);//设置图像的边框$graph->SetScale("textint");//定义刻度值的类型$graph->SetShadow();//设置图像阴影$graph->title->Set(iconv("utf-8","gb2312",'数学成绩'));//定义标题$graph->title->SetFont(FF_SIMSUN, FS_BOLD);     //设置标题字$graph->title->SetMargin(10);     //设置标题字$graph->xaxis->SetTickLabels($x);$graph->xaxis->SetFont(FF_SIMSUN, FS_BOLD,8);//定义字体$graph->xaxis->title->Set(iconv("utf-8","gb2312",'学号'));//设置X轴的标题$graph->xaxis->title->SetFont(FF_SIMSUN, FS_BOLD);     //设置标题字$graph->xaxis->title->SetMargin(10);//定义字体$p1 = new LinePlot($y);//创建折线图像$p1->value->SetFont(FF_ARIAL,FS_BOLD);//定义图像值的字体$graph->Add($p1);$p1->value->Show();//输出图像对应的数据值$graph->Stroke();//输出图像?>