From 28ec285069b9b3d4782be6a9e064556ba15b0391 Mon Sep 17 00:00:00 2001
From: Pim van den Berg
Date: Sat, 18 May 2013 17:38:07 +0200
Subject: add support for graphing I/O using the negative X-axis

---
 type/GenericIO.class.php | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

(limited to 'type/GenericIO.class.php')

diff --git a/type/GenericIO.class.php b/type/GenericIO.class.php
index 0cf3e22..3425f3e 100644
--- a/type/GenericIO.class.php
+++ b/type/GenericIO.class.php
@@ -16,7 +16,7 @@ class Type_GenericIO extends Type_Default {
 		foreach ($this->tinstances as $tinstance) {
 			foreach ($this->data_sources as $ds) {
 				$rrdgraph[] = sprintf('DEF:min_%s%s=%s:%s:MIN', crc32hex($sources[$i]), $raw, $this->parse_filename($this->files[$tinstance]), $ds);
-				$rrdgraph[] = sprintf('DEF:avg_%s%s=%s:%s:AVERAGE', crc32hex($sources[$i]), $raw, $this->parse_filename($this->files[$tinstance]), $ds);
+				$rrdgraph[] = sprintf('DEF:avg_%s_raw=%s:%s:AVERAGE', crc32hex($sources[$i]), $this->parse_filename($this->files[$tinstance]), $ds);
 				$rrdgraph[] = sprintf('DEF:max_%s%s=%s:%s:MAX', crc32hex($sources[$i]), $raw, $this->parse_filename($this->files[$tinstance]), $ds);
 				if (!$this->scale)
 					$rrdgraph[] = sprintf('VDEF:tot_%s=avg_%1$s,TOTAL', crc32hex($sources[$i]));
@@ -30,17 +30,21 @@ class Type_GenericIO extends Type_Default {
 					$rrdgraph[] = sprintf('CDEF:min_%s=min_%1$s_raw,%s,*', crc32hex($sources[$i]), $this->scale);
 					$rrdgraph[] = sprintf('CDEF:avg_%s=avg_%1$s_raw,%s,*', crc32hex($sources[$i]), $this->scale);
 					$rrdgraph[] = sprintf('CDEF:max_%s=max_%1$s_raw,%s,*', crc32hex($sources[$i]), $this->scale);
+					if ($i == 1)
+						$rrdgraph[] = sprintf('CDEF:avg_%s_neg=avg_%1$s_raw,%s%s,*', crc32hex($sources[$i]), $this->negative_io ? '-' : '', $this->scale);
 					$rrdgraph[] = sprintf('VDEF:tot_%1$s=avg_%1$s,TOTAL', crc32hex($sources[$i]));
 					$i++;
 				}
 			}
 		}
 
-		$rrdgraph[] = sprintf('CDEF:overlap=avg_%s,avg_%s,LT,avg_%1$s,avg_%2$s,IF',
+		$rrdgraph[] = sprintf('CDEF:overlap=avg_%s,avg_%s_neg,LT,avg_%1$s,avg_%2$s_neg,IF',
 						crc32hex($sources[0]), crc32hex($sources[1]));
 
+		$i = 0;
 		foreach($sources as $source) {
-			$rrdgraph[] = sprintf('AREA:avg_%s#%s', crc32hex($source), $this->get_faded_color($this->colors[$source]));
+			$rrdgraph[] = sprintf('AREA:avg_%s%s#%s', crc32hex($source), $i == 1 ? '_neg' : '', $this->get_faded_color($this->colors[$source]));
+			$i++;
 		}
 
 		$rrdgraph[] = sprintf('AREA:overlap#%s',
@@ -50,14 +54,16 @@ class Type_GenericIO extends Type_Default {
 			)
 		);
 
+		$i = 0;
 		foreach($sources as $source) {
 			$dsname = $this->ds_names[$source] != '' ? $this->ds_names[$source] : $source;
-			$rrdgraph[] = sprintf('"LINE1:avg_%s#%s:%s"', crc32hex($source), $this->colors[$source], $this->rrd_escape($dsname));
+			$rrdgraph[] = sprintf('"LINE1:avg_%s%s#%s:%s"', crc32hex($source), $i == 1 ? '_neg' : '', $this->colors[$source], $this->rrd_escape($dsname));
 			$rrdgraph[] = sprintf('"GPRINT:min_%s:MIN:%s Min,"', crc32hex($source), $this->rrd_format);
 			$rrdgraph[] = sprintf('"GPRINT:avg_%s:AVERAGE:%s Avg,"', crc32hex($source), $this->rrd_format);
 			$rrdgraph[] = sprintf('"GPRINT:max_%s:MAX:%s Max,"', crc32hex($source), $this->rrd_format);
 			$rrdgraph[] = sprintf('"GPRINT:avg_%s:LAST:%s Last"', crc32hex($source), $this->rrd_format);
 			$rrdgraph[] = sprintf('"GPRINT:tot_%s:%s Total\l"',crc32hex($source), $this->rrd_format);
+			$i++;
 		}
 		
 		return $rrdgraph;
-- 
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