source: trunk/xgraph/jpgraph/Examples/manualtickex2.php

<?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();

?>