function test($count, $maxlabels)
{
# Make an array of count records, like PHPlot uses, with labels:
$data = array();
for ($i = 0; $i < $count; $i++) {
$data[] = array("Row {$i}", $i, 100, 200, 300);
}
prune_labels($data, $maxlabels);
# See how many labels are non-blank now:
$line = '';
$non_blank = 0;
for ($i = 0; $i < $count; $i++) {
if (!empty($data[$i][0])) {
$non_blank++;
$line .= '*';
} else {
$line .= '_';
}
}
$status = $non_blank <= $maxlabels ? 'PASS' : 'FAIL';
echo "{$status}: {$count} rows, maxlabels={$maxlabels} => {$non_blank} labels\n";
echo substr($line, 0, 80) . "\n";
# Only show first 80 chars.
}
<?php
# PHPlot / contrib / prune_labels : Example
# $Id: prune_labels.example.php,v 1.1 2009/12/09 03:45:53 lbayuk Exp $
# This produces 250 data points with date-formatted labels, and sets
# a max of 20 labels to display.
require_once 'phplot.php';
require_once 'prune_labels.php';
$base = mktime(12, 0, 0, 1, 1, 2000);
$data = array();
for ($i = 0; $i < 250; $i++) {
$data[] = array(86400 * $i + $base, $i, $i * 0.2);
}
# Show no more than 20 labels:
prune_labels($data, 20);
$p = new PHPlot(800, 600);
$p->SetTitle('Example - pruned data labels');
$p->SetDataType('data-data');
$p->SetDataValues($data);
$p->SetXLabelType('time', '%Y-%m-%d');
$p->SetXLabelAngle(90);
$p->SetXDataLabelPos('plotdown');
$p->SetXTickLabelPos('none');
$p->SetXTickPos('none');
$p->SetDrawXGrid(False);
$p->SetDrawYGrid(False);
$p->SetPlotType('lines');
$p->DrawGraph();
