$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 { # Generate charts from validated user supplied dates. if (_DEBUG) { echo "

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

"; } 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); # Send html commands to client browser. 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 */ # Define path on server to chart files. $chartPath = _CHART_DIRECTORY . $chartFile . ".png"; # Format the rrdtool chart command. # Set chart file name, start time, end time, height, and width. $cmdfmt = "rrdtool graph %s -a PNG -s %s -e %s -w %s -h %s "; $cmd = sprintf($cmdfmt, $chartPath, $begin, $end, _CHART_WIDTH, _CHART_HEIGHT); $cmdfmt = "-l %s -u %s -r "; # Set upper and lower ordinate bounds. if ($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); # Define moving average window width. $trendWindow = floor(($end - $begin) / 12); # Show the data, or a moving average trend line over # the data, or both. $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 "; $cmdfmt = "CDEF:smoothed=dSeries,%s,TREND LINE3:smoothed#ff0000 "; #$cmdfmt = "CDEF:smoothed=dSeries,%s,XYZZY LINE3:smoothed#ff0000 "; $cmd .= sprintf($cmdfmt, $trendWindow); } # Execute the formatted rrdtool command in the shell. The rrdtool # command will complete execution before the html image tags get # sent to the browser. This assures that the charts are available # when the client browser executes the html code that loads the # charts into the document displayed by the client browser. if (_DEBUG) { echo "

chart command:
" . $cmd . "

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

result:
" . $result . "

"; } } ?>