From df79a3e65d7a522fd942269261d9e3ff38a8e2aa Mon Sep 17 00:00:00 2001
From: Frank Wuerthwein <fkw@ucsd.edu>
Date: Fri, 13 Feb 2009 13:44:06 +0000
Subject: Initial version

---
 src/lib/rrdFlotSupport.js | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 src/lib/rrdFlotSupport.js

diff --git a/src/lib/rrdFlotSupport.js b/src/lib/rrdFlotSupport.js
new file mode 100644
index 0000000..8ab8ba7
--- /dev/null
+++ b/src/lib/rrdFlotSupport.js
@@ -0,0 +1,50 @@
+/*
+ * Support library for grpahing RRD files with Flot
+ * Part of the javascriptRRD package
+ * Copyright (c) 2009 Frank Wuerthwein, fkw@ucsd.edu
+ *
+ * Original repository: http://javascriptrrd.sourceforge.net/
+ * 
+ * MIT License [http://www.opensource.org/licenses/mit-license.php]
+ *
+ */
+
+/*
+ *
+ * Flot is a javascript plotting library developed and maintained by
+ * Ole Laursen [http://code.google.com/p/flot/]
+ *
+ */
+
+function rrdDS2FlotSeries(rrd_file,ds_id,rra_idx,want_label) {
+  var ds=rrd_file.getDS(ds_id);
+  var ds_name=ds.getName();
+  var ds_idx=ds.getIdx();
+  var rra=rrd_file.getRRA(rra_idx);
+  var rra_rows=rra.getNrRows();
+  var last_update=rrd_file.getLastUpdate();
+  var step=rra.getStep();
+
+  var flot_series=[];
+  for (var i=0;i<rra_rows;i++) {
+    var timestamp=(last_update+(i-rra_rows+1)*step)*1000.0;
+    var el=rra.getEl(i,ds_idx);
+    if (el!=undefined) {
+      flot_series.push([timestamp,el]);
+    } else {
+      if ((i>0) && ((i+1)<rra_rows)) {
+	flot_series.push([timestamp,null]);
+      } else {
+	// Flot misbehaves if first or last point is null
+	flot_series.push([timestamp,0]);
+      } 
+    } 
+  } // end for
+
+  if (want_label!=false) {
+    return {label: ds_name, data: flot_series};
+  } else {
+    return {data:flot_series};
+  }
+}
+
-- 
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