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();
    ?>