manualtickex1a.php

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    <?php // content="text/plain; charset=utf-8"
    //
    // Basic example on how to use custom tickmark feature to have a label
    // at the start of each month.
    //
    require_once ("jpgraph/jpgraph.php");
    require_once ("jpgraph/jpgraph_line.php");
    require_once ("jpgraph/jpgraph_utils.inc.php");

    //
    // Create some random data for the plot. We use the current time for the
    // first X-position
    //
    $datay = array();
    $datax = array();
    $ts = time();
    $n=15; // Number of data points
    for($i=0; $i < $n; ++$i ) {
        $datax[$i] = $ts+$i*700000;
        $datay[$i] = rand(5,60);
    }

    // Now get labels at the start of each month
    $dateUtils = new DateScaleUtils();
    list($tickPositions,$minTickPositions) = $dateUtils->GetTicks($datax);

    // We add some grace to the end of the X-axis scale so that the first and last
    // data point isn't exactly at the very end or beginning of the scale
    $grace = 400000;
    $xmin = $datax[0]-$grace;
    $xmax = $datax[$n-1]+$grace;

    //
    // The code to setup a very basic graph
    //
    $graph = new Graph(400,200);

    //
    // We use an integer scale on the X-axis since the positions on the X axis
    // are assumed to be UNI timestamps
    $graph->SetScale('intlin',0,0,$xmin,$xmax);
    $graph->title->Set('Basic example with manual ticks');
    $graph->title->SetFont(FF_ARIAL,FS_NORMAL,12);

    //
    // Make sure that the X-axis is always at the bottom of the scale
    // (By default the X-axis is alwys positioned at Y=0 so if the scale
    // doesn't happen to include 0 the axis will not be shown)
    $graph->xaxis->SetPos('min');

    // Now set the tic positions
    $graph->xaxis->SetTickPositions($tickPositions,$minTickPositions);

    // The labels should be formatted at dates with "Year-month"
    $graph->xaxis->SetLabelFormatString('My',true);

    // Use Ariel font
    $graph->xaxis->SetFont(FF_ARIAL,FS_NORMAL,9);

    // Add a X-grid
    $graph->xgrid->Show();

    // Create the plot line
    $p1 = new LinePlot($datay,$datax);
    $p1->SetColor('teal');
    $graph->Add($p1);

    // Output graph
    $graph->Stroke();

    ?>