From 91765b1419fcb78da8c4625580a939c9a095e346 Mon Sep 17 00:00:00 2001
From: Frank Wuerthwein <fkw@ucsd.edu>
Date: Fri, 1 May 2009 02:59:27 +0000
Subject: Add rrdRRAStackFlotObj

---
 src/lib/rrdFlotSupport.js | 114 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)

diff --git a/src/lib/rrdFlotSupport.js b/src/lib/rrdFlotSupport.js
index 2fd7268..634604c 100644
--- a/src/lib/rrdFlotSupport.js
+++ b/src/lib/rrdFlotSupport.js
@@ -88,7 +88,121 @@ function rrdRRA2FlotObj(rrd_file,rra_idx,ds_list,want_ds_labels,want_rounding) {
       flot_el.label= ds_name;
     }
     out_el.data.push(flot_el);
+  } //end for ds_list_idx
+  return out_el;
+}
+
+// return an object with an array containing Flot elements
+//  have a positive and a negative stack of DSes, plus DSes with no stacking
+// min and max are also returned
+// If one_undefined_enough==true, a whole stack is invalidated is a single element
+//  of the stack is invalid
+function rrdRRAStackFlotObj(rrd_file,rra_idx,
+			    ds_positive_stack_list,ds_negative_stack_list,ds_single_list,
+			    want_ds_labels,want_rounding,one_undefined_enough) {
+  var rra=rrd_file.getRRA(rra_idx);
+  var rra_rows=rra.getNrRows();
+  var last_update=rrd_file.getLastUpdate();
+  var step=rra.getStep();
+  if (want_rounding!=false) {
+    // round last_update to step
+    // so that all elements are sync
+    last_update-=(last_update%step); 
+  }
+  if (one_undefined_enough!=true) { // make sure it is a boolean
+    one_undefined_enough=false;
   }
+
+  var first_el=last_update-(rra_rows-1)*step;
+
+  var out_el={data:[], min:first_el*1000.0, max:last_update*1000.0};
+
+  // first the stacks stack
+  var stack_els=[ds_positive_stack_list,ds_negative_stack_list];
+  for (stack_list_id in stack_els) {
+    var stack_list=stack_els[stack_list_id];
+    var tmp_flot_els=[];
+    var tmp_ds_ids=[];
+    var tmp_nr_ids=stack_list.length;
+    for (ds_list_idx in stack_list) {
+      var ds_id=stack_list[ds_list_idx];
+      var ds=rrd_file.getDS(ds_id);
+      var ds_name=ds.getName();
+      var ds_idx=ds.getIdx();
+      tmp_ds_ids.append(ds_idx); // getting this is expensive, call only once
+      
+      // initialize
+      var flot_el={data:[]}
+      if (want_ds_labels!=false) {
+	var ds_name=ds.getName();
+	flot_el.label= ds_name;
+      }
+      tmp_flot_els.append(flot_el);
+    }
+
+    var timestamp=first_el;
+    for (var row=0;row<rra_rows;row++) {
+      var ds_vals=[];
+      var all_undef=true;
+      var all_def=true;
+      for (var id=0; id<tmp_nr_ids; id++) {
+	var ds_idx=tmp_ds_ids[id];
+	var el=rra.getEl(row,ds_idx);
+	if (el!=undefined) {
+	  all_undef=false;
+	  ds_val.push(el);
+	} else {
+	  all_def=false;
+	  ds_val.push(0);
+	}
+      } // end for id
+      if (!all_undef) { // if all undefined, skip
+	if (all_def || (!one_undefined_enough)) {
+	  // this is a valid column, do the math
+	  for (var id=1; id<tmp_nr_ids; id++) {
+	    ds_val[id]+=ds_val[id-1]; // both positive and negative stack use a +, negative stack assumes negative values
+	  }
+	  // fill the flot data
+	  for (var id=0; id<tmp_nr_ids; id++) {
+	    tmp_flot_els[id].data.push([timestamp*1000.0,ds_val[id]]);
+	  }
+	}
+      } // end if
+
+      timestamp+=step;
+    } // end for row
+    
+    // put flot data in output object
+    // reverse order so higher numbers are behind
+    for (var id=0; id<tmp_nr_ids; id++) {
+      out_el.data.push(tmp_flot_els[tmp_nr_ids-id-1]);
+    }
+  } //end for stack_list_id
+
+  for (var row=0;row<rra_rows;row++) {
+    for (ds_list_idx in ds_list) {
+      var ds_id=ds_list[ds_list_idx];
+      var ds=rrd_file.getDS(ds_id);
+      var ds_name=ds.getName();
+      var ds_idx=ds.getIdx();
+      
+      var timestamp=first_el;
+      var flot_series=[];
+
+      var el=rra.getEl(row,ds_idx);
+      if (el!=undefined) {
+	flot_series.push([timestamp*1000.0,el]);
+      }
+      timestamp+=step;
+    } // end for
+    
+    var flot_el={data:flot_series};
+    if (want_ds_labels!=false) {
+      var ds_name=ds.getName();
+      flot_el.label= ds_name;
+    }
+    out_el.data.push(flot_el);
+  } //end for row
   return out_el;
 }
 
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