source: trunk/xgraph/jpgraph/Examples/example3.4.1.php@ 42

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

// A function to return the Roman Numeral, given an integer
 function numberToRoman($aNum)
 {
     // Make sure that we only use the integer portion of the value
     $n = intval($aNum);
     $result = '';

     // Declare a lookup array that we will use to traverse the number:
     $lookup = array('M' => 1000, 'CM' => 900, 'D' => 500, 'CD' => 400,
     'C' => 100, 'XC' => 90, 'L' => 50, 'XL' => 40,
     'X' => 10, 'IX' => 9, 'V' => 5, 'IV' => 4, 'I' => 1);

     foreach ($lookup as $roman => $value)
     {
         // Determine the number of matches
         $matches = intval($n / $value);

         // Store that many characters
         $result .= str_repeat($roman, $matches);

         // Substract that from the number
         $n = $n % $value;
     }

     // The Roman numeral should be built, return it
     return $result;
}

function formatCallback($aVal) {
        return '('.numberToRoman($aVal).')';
}


 // Some (random) data
$ydata = array(11,3,8,12,5,1,9,13,5,7);

// Size of the overall graph
$width=350;
$height=250;

// Create the graph and set a scale.
// These two calls are always required
$graph = new Graph($width,$height);
$graph->SetScale('intlin');
$graph->SetShadow();

// Setup margin and titles
$graph->SetMargin(40,20,20,40);
$graph->title->Set('Calls per operator');
$graph->subtitle->Set('(March 12, 2008)');
$graph->xaxis->title->Set('Operator');
$graph->yaxis->title->Set('# of calls');

$graph->yaxis->title->SetFont( FF_FONT1 , FS_BOLD );
$graph->xaxis->title->SetFont( FF_FONT1 , FS_BOLD );

$graph->yaxis->SetColor('blue');

// Create the linear plot
$lineplot=new LinePlot($ydata);
$lineplot->SetColor( 'blue' );
$lineplot->SetWeight( 2 );   // Two pixel wide
$lineplot->mark->SetType(MARK_UTRIANGLE);
$lineplot->mark->SetColor('blue');
$lineplot->mark->SetFillColor('red');

$lineplot->value->Show();
$lineplot->value->SetFont(FF_ARIAL,FS_BOLD,10);
$lineplot->value->SetColor('darkred');
$lineplot->value->SetFormatCallback('formatCallback');

// Add the plot to the graph
$graph->Add($lineplot);

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