php做条形图 JpGraph

[chinatyq]

如果是一组数据，用数组就可以，如
$values = array(23,32,35,57,12,3,36,54,32,15,43);
$columns = count($values);
$width = 300;
$height = 200;
$padding = 5;
$im = imagecreate($width,$height);
$white = imagecolorallocate ($im,0xff,0xff,0xff);
imagefilledrectangle($im,0,0,$width,$height,$white);
$max_value = max($values);
for($i=0;$i<$columns;$i++)
{

$column_height = ($height / 100) * (( $values[$i] / $max_value)

*100);

$x1 = $i*$column_width;
$y1 = $height-$column_height;
$x2 = (($i+1)*$column_width)-$padding;
$y2 = $height;

imagefilledrectangle($im,$x1,$y1,$x2,$y2,$gray);


imageline($im,$x1,$y1,$x1,$y2,$gray_lite);
imageline($im,$x1,$y2,$x2,$y2,$gray_lite);
imageline($im,$x2,$y1,$x2,$y2,$gray_dark);
}


header ("Content-type: image/png");

imagepng($im);
?>
可是如是2组相比较的数据呢？如
日期 地区一 地区二
一月 300 600
二月 600 700
三月 450 900
四月 790 600
五月 600 300

日期为横轴，做条形图，该如何呢？多谢

[xuzuning]

这是 JpGraph 吗？

[chinatyq]

require 'jpgraph/jpgraph.php'; require 'jpgraph/jpgraph_bar.php'; $graph = new Graph(800,600); $graph->SetScale('textlin'); $graph->SetMargin(50,30,30,60); $graph->title->Set('2012年前9个月PHP使用率统计图'); $graph->title->SetFont(FF_SIMSUN,FS_BOLD); $graph->xaxis->title->Set('月份'); $graph->xaxis->title->SetFont(FF_SIMSUN,FS_BOLD); $graph->yaxis->title->Set('使用率'); $graph->yaxis->title->SetFont(FF_SIMSUN,FS_BOLD); $graph->yaxis->SetTitleMargin(30); $datay = array(5.7,5.6,5.5,5.3,5.7,5.3,5,5.5,5.6); $bar = new BarPlot($datay); $graph->Add($bar); $graph->stroke(); 上面这个是的，但是只能实现一组数，我有两组数地区一和地区二相比较（要求每两个条形图并排列）按1月2月3月在横轴上展开，如何实现？多谢