y2synch.php
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<?php // content="text/plain; charset=utf-8"
require_once ("jpgraph/jpgraph.php");
require_once ("jpgraph/jpgraph_line.php");
require_once ("jpgraph/jpgraph_bar.php");
 
 
function toFahrenheit($aVal) {
    return round(($aVal*9/5)+32,2);
}
 
function toCelcius($aVal) {
    return round(($aVal-32)*5/9,2);
}
 
 
$datay =array(2,3,8,19,7,17,6,22);
 
// Create the graph. 
$graph = new Graph(400,280);
 
// Slightly bigger margins than default to make room for titles
$graph->SetMargin(50,60,40,45);
$graph->SetMarginColor('white');
 
 
// Setup the scales for X,Y and Y2 axis
$graph->SetScale("intlin"); // X and Y axis
$graph->SetY2Scale("lin"); // Y2 axis
 
// Overall graph title
$graph->title->Set('Synchronized Y & Y2 scales');
$graph->title->SetFont(FF_ARIAL,FS_BOLD,12);
 
// Title for X-axis
$graph->xaxis->title->Set('Measurement');
$graph->xaxis->title->SetMargin(5);
$graph->xaxis->title->SetFont(FF_ARIAL,FS_NORMAL,11);
 
// Create Y data set 
$lplot = new LinePlot($datay);
$graph->yaxis->title->Set('Celcius (C)');
$graph->yaxis->title->SetMargin(5);
$graph->yaxis->title->SetFont(FF_ARIAL,FS_NORMAL,11);
// ... and add the plot to the Y-axis
$graph->Add($lplot);
 
// Create Y2 scale data set 
$l2plot = new LinePlot($datay);
$l2plot->SetWeight(0);
$graph->y2axis->title->Set('Fahrenheit (F)');
$graph->y2axis->title->SetMargin(5); // Some extra margin to clear labels
$graph->y2axis->title->SetFont(FF_ARIAL,FS_NORMAL,11);
$graph->y2axis->SetLabelFormatCallback('toFahrenheit');
$graph->y2axis->SetColor('navy');
 
// ... and add the plot to the Y2-axis
$graph->AddY2($l2plot);
 
$graph->Stroke();
?>