<?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\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
$p1 = new Plot\LinePlot($datay, $datax);
$p1->SetColor('teal');
$graph->Add($p1);

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