manualtickex2.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
    //
    $f = new FuncGenerator('cos($x)+1.5*cos(2*$x)');
    list($datax,$datay) = $f->E(0,10);

    // Now get labels at 1/2 PI intervall
    $tickPositions = array();
    $tickLabels = array();
    $tickPositions[0] = 0;
    $tickLabels[0] = '0';
    for($i=1; $i/2*M_PI < 11 ; ++$i ) {
        $tickPositions[$i] = $i/2*M_PI;
        if( $i % 2 )
        $tickLabels[$i] = $i.'/2'.SymChar::Get('pi');
        else
        $tickLabels[$i] = ($i/2).SymChar::Get('pi');
    }

    $n = count($datax);
    $xmin = $datax[0];
    $xmax = $datax[$n-1];

    //
    // 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
    $graph->SetScale('linlin',0,0,$xmin,$xmax);
    $graph->title->Set('Example with manual tick labels');
    $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
    $graph->xaxis->SetMajTickPositions($tickPositions,$tickLabels);

    // Use Times font
    $graph->xaxis->SetFont(FF_TIMES,FS_NORMAL,10);
    $graph->yaxis->SetFont(FF_TIMES,FS_NORMAL,10);

    // 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();

    ?>