条形图设计

Question

我尝试创建用于显示数据的条形图但是发生了问题。

以下是代码：

<?php 

 $gpa11=$_REQUEST['gpa11'];
 $gpa12=$_REQUEST['gpa12'];

 $gpa21=$_REQUEST['gpa21'];
 $gpa22=$_REQUEST['gpa22'];

 $gpa31=$_REQUEST['gpa31'];
 $gpa32=$_REQUEST['gpa32'];

 $gpa41=$_REQUEST['gpa41'];
 $gpa42=$_REQUEST['gpa42'];

 $gpa51=$_REQUEST['gpa51'];
 $gpa52=$_REQUEST['gpa52'];

?>

<?php // content="text/plain; charset=utf-8"
require_once ('jpgraph/jpgraph.php');
require_once ('jpgraph/jpgraph_bar.php');

$data1y=array($gpa11,$gpa21,$gpa31,$gpa41, $gpa51);
$data2y=array($gpa12,$gpa22,$gpa32,$gpa42, $gpa52);



// Create the graph. These two calls are always required
$graph = new Graph(350,200,'auto');
$graph->SetScale("textlin");

$theme_class=new UniversalTheme;
$graph->SetTheme($theme_class);

$graph->yaxis->SetTickPositions(array(0,30,60,90,120,150), array(15,45,75,105,135));
$graph->SetBox(false);

$graph->ygrid->SetFill(false);
$graph->xaxis->SetTickLabels(array('Year 1','Year 2','Year 3','Year 4','Year 5'));
$graph->yaxis->HideLine(false);
$graph->yaxis->HideTicks(false,false);

// Create the bar plots
$b1plot = new BarPlot($data1y);
$b2plot = new BarPlot($data2y);

// Create the grouped bar plot
$gbplot = new GroupBarPlot(array($b1plot,$b2plot));
// ...and add it to the graPH
$graph->Add($gbplot);


$b1plot->SetColor("white");
$b1plot->SetFillColor("#cc1111");

$b2plot->SetColor("white");
$b2plot->SetFillColor("#11cccc");

$graph->title->Set("GPA Performance Graph");

// Display the graph
$graph->Stroke();
?>

当我试图显示条形图时，它显示“JpGraph错误：25067您手动指定的刻度和刻度不正确。刻度似乎太小而无法容纳任何指定的刻度线。”请告知我必须做些什么来纠正这个问题。