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<html>
<!-- Courtsey ruler
12345678901234567890123456789012345678901234567890123456789012345678901234567890
-->
<head>
<style>
p {
font: 14px ariel, sans serif;
}
#errorMsg {
font:bold 18px arial,sans-serif;
color:red;
text-align:center;
}
.chartContainer {
padding: 2px;
}
img.chart {
width:100%;
}
</style>
</head>
<body>
<?php
/*
done - Convert dates to epoch time
done - Rrdtool - get first in time and last in time
From above validate begin and end dates
Rrdtool - create charts of time period
use $output = shell_exec($cmd); to execute rrdtool commands
*/
# round robin database file
$_RRD_FILE = "/home/pi/database/arednsigData.rrd";
# charts html directory
$_GRAPH_DIRECTORY = "/home/pi/public_html/arednsig/dynamic/";
# standard chart width in pixels
$_GRAPH_WIDTH = 600;
# standard chart height in pixels
$_GRAPH_HEIGHT = 150;
# debug mode
$_DEBUG = false;
error_reporting(E_ALL);
# Get user supplied chart begin and end dates.
$beginDate = $_POST["beginDate"];
$endDate = $_POST["endDate"];
$cmd = sprintf("rrdtool first %s --rraindex 1",$_RRD_FILE);
$firstDP = shell_exec($cmd);
$cmd = sprintf("rrdtool last %s", $_RRD_FILE);
$lastDP = shell_exec($cmd);
$beginDateEp = strtotime($beginDate);
$endDateEp = strtotime($endDate);
# data entry validation and error checking
if ($beginDateEp > $endDateEp) {
echo "<p id=\"errorMsg\">" .
"End date must be after begin date.</p>";
} elseif ($beginDateEp < $firstDP || $endDateEp > $lastDP) {
echo "<p id=\"errorMsg\">" .
"Date range must be between " .
date('m / d / Y', $firstDP) . " and " .
date('m / d / Y', $lastDP) . ".</p>";
} else {
createChart('custom_signal', 'S', 'dBm',
'RSSI', $beginDateEp, $endDateEp,
0, 0, 2, false);
createChart('custom_snr', 'SNR', 'dBm',
'S/N', $beginDateEp, $endDateEp,
0, 0, 2, false);
if ($_DEBUG) {
echo "<p>Date range: " . $beginDateEp . " thru " .
$endDateEp . "</p>";
}
echo "<div class=\"chartContainer\">" .
"<img class=\"chart\" src=\"dynamic/custom_signal.png\">" .
"</div>";
echo "<div class=\"chartContainer\">" .
"<img class=\"chart\" src=\"dynamic/custom_snr.png\">" .
"</div>";
}
function createChart($chartFile, $dataItem, $label, $title, $begin,
$end, $lower, $upper, $addTrend, $autoScale) {
/*
Uses rrdtool to create a chart of specified aredn node data item.
Parameters:
fileName - name of the created chart file
dataItem - data item to be charted
label - string containing a label for the item to be charted
title - string containing a title for the chart
begin - beginning time of the chart data
end - ending time of the data to be charted
lower - lower bound for chart ordinate #NOT USED
upper - upper bound for chart ordinate #NOT USED
addTrend - 0, show only chart data
1, show only a trend line
2, show a trend line and the chart data
autoScale - if True, then use vertical axis auto scaling
(lower and upper parameters are ignored), otherwise use
lower and upper parameters to set vertical axis scale
Returns: True if successful, False otherwise
*/
global $_DEBUG, $_GRAPH_DIRECTORY, $_GRAPH_WIDTH,
$_GRAPH_HEIGHT, $_RRD_FILE;
$chartPath = $_GRAPH_DIRECTORY . $chartFile . ".png";
# Format the rrdtool chart command.
# Set chart start time, height, and width.
$cmdfmt = "rrdtool graph %s -a PNG -s %s -e %s -w %s -h %s ";
$cmd = sprintf($cmdfmt, $chartPath, $begin, $end, $_GRAPH_WIDTH,
$_GRAPH_HEIGHT);
$cmdfmt = "-l %s -u %s -r ";
if ($lower < $upper) {
$cmd .= sprintf($cmdfmt, $lower, $upper);
} elseif ($autoScale) {
$cmd .= "-A ";
}
$cmd .= "-Y ";
# Set the chart ordinate label and chart title.
$cmdfmt = "-v %s -t %s ";
$cmd .= sprintf($cmdfmt, $label, $title);
# Show the data, or a moving average trend line over
# the data, or both.
$trendWindow = floor(($end - $begin) / 12);
$cmdfmt = "DEF:dSeries=%s:%s:LAST ";
$cmd .= sprintf($cmdfmt, $_RRD_FILE, $dataItem);
if ($addTrend == 0) {
$cmd .= "LINE1:dSeries#0400ff ";
} elseif ($addTrend == 1) {
$cmdfmt = "CDEF:smoothed=dSeries,%s,TREND LINE3:smoothed#ff0000 ";
$cmd .= sprintf($cmdfmt, $trendWindow);
} elseif ($addTrend == 2) {
$cmd .= "LINE1:dSeries#0400ff ";
$cmdfmt = "CDEF:smoothed=dSeries,%s,TREND LINE3:smoothed#ff0000 ";
$cmd .= sprintf($cmdfmt, $trendWindow);
}
if ($_DEBUG) {
echo "<p>chart command:<br>" . $cmd . "</p>";
}
$result = shell_exec($cmd . "2>&1");
if ($_DEBUG == true) {
echo "<p>result:<br>" . $result . "</p>";
}
}
?>
</body>
</html>
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