datescaleticksex01.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_date.php");

    DEFINE('INTERVAL', 5*60);

    // First create some "dummy" data
    $m = 5; // Number of data sets
    $n = 4; // Number of bids to show
    $startbid = 8000;

    for( $i=0; $i < $m; ++$i ) {
        $bids[$i] = array($startbid + rand(100,500)*10 );
        for( $j=1; $j < $n; ++$j ) {
            $bids[$i][$j] = $bids[$i][$j-1] + rand(20,500)*10;
        }
    }

    $start = floor(time()/INTERVAL)*INTERVAL;
    $times = array($start);
    for( $i=1; $i < $n; ++$i ) {
        // Create a timestamp for every 5 minutes
        $times[$i] = $times[$i-1]+INTERVAL;
    }

    // Setup the bid graph
    $graph = new Graph(600,250);
    $graph->SetMargin(80,30,50,40);
    $graph->SetMarginColor('white');
    $graph->SetScale('dateint');
    $graph->title->Set('Current Bids');
    $graph->title->SetFont(FF_ARIAL,FS_BOLD,12);
    $graph->subtitle->Set('(Updated every 5 minutes)');
    $graph->subtitle->SetFont(FF_ARIAL,FS_ITALIC,10);

    // Enable antialias
    $graph->img->SetAntiAliasing();

    // Setup the y-axis to show currency values
    $graph->yaxis->SetLabelFormatCallback('number_format');
    $graph->yaxis->SetLabelFormat('$%s');

    //Use hour:minute format for the labels
    $graph->xaxis->scale->SetDateFormat('H:i');

    // Force labels to only be displayed every 5 minutes
    $graph->xaxis->scale->ticks->Set(INTERVAL);

    // Adjust the start time for an "even" 5 minute, i.e. 5,10,15,20,25, ...
    $graph->xaxis->scale->SetTimeAlign(MINADJ_5);

    // Create the plots using the dummy data created at the beginning
    $line = array();
    for( $i=0; $i < $m; ++$i ) {
        $line[$i] = new LinePlot($bids[$i],$times);
        $line[$i]->mark->SetType(MARK_SQUARE);
    }
    $graph->Add($line);

    // Send the graph back to the client
    $graph->Stroke();
    ?>