$endDateEp) { echo "

" . "End date must be after begin date.

"; } elseif ($beginDateEp < $firstDP || $endDateEp > $lastDP) { echo "

" . "Date range must be between " . date('m / d / Y', $firstDP) . " and " . date('m / d / Y', $lastDP) . ".

"; } 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 "

Date range: " . $beginDateEp . " thru " . $endDateEp . "

"; } echo "

" . "

"; echo "

" . "

"; } 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 "

chart command:
" . $cmd . "

"; } $result = shell_exec($cmd . "2>&1"); if ($_DEBUG == true) { echo "

result:
" . $result . "

"; } } ?>