Fix couple of off-by-one errors

Add some enhancements for stacking (especially with regard to shading)

lib/timeline/Graph2d.js

@@ -217,7 +217,7 @@ Graph2d.prototype.getLegend = function(groupId, width, height) {
     return this.linegraph.groups[groupId].getLegend(width,height);
   }
   else {
-    return "cannot find group:" +  groupId;
+    return "cannot find group:'" +  groupId + "'";
   }
 };
 

lib/timeline/component/GraphGroup.js

@@ -73,7 +73,7 @@ GraphGroup.prototype.setZeroPosition = function (pos) {
  */
 GraphGroup.prototype.setOptions = function (options) {
   if (options !== undefined) {
-    var fields = ['sampling', 'style', 'sort', 'yAxisOrientation', 'barChart', 'excludeFromLegend'];
+    var fields = ['sampling', 'style', 'sort', 'yAxisOrientation', 'barChart', 'excludeFromLegend', 'excludeFromStacking'];
     util.selectiveDeepExtend(fields, this.options, options);
 
     // if the group's drawPoints is a function delegate the callback to the onRender property

lib/timeline/component/LineGraph.js

@@ -89,7 +89,7 @@ function LineGraph(body, options) {
     }
   };
 
-  // options is shared by this ItemSet and all its items
+  // options is shared by this lineGraph and all its items
   this.options = util.extend({}, this.defaultOptions);
   this.dom = {};
   this.props = {};
@@ -643,10 +643,25 @@ LineGraph.prototype._updateGraph = function () {
         this.abortedGraphUpdate = false;
 
         // With the yAxis scaled correctly, use this to get the Y values of the points.
+        var below = undefined;
         for (i = 0; i < groupIds.length; i++) {
           group = this.groups[groupIds[i]];
-          if (this.options.stack === true && this.options.style === 'line' && i > 0) {
-            this._stack(groupsData[groupIds[i]], groupsData[groupIds[i - 1]]);
+          if (this.options.stack === true && this.options.style === 'line') {
+            if (group.options.excludeFromStacking == undefined || !group.options.excludeFromStacking) {
+              if (below != undefined) {
+                this._stack(groupsData[group.id], groupsData[below.id]);
+                if (group.options.shaded.enabled == true && group.options.shaded.orientation !== "group"){
+                  if (group.options.shaded.orientation == "top" && below.options.shaded.orientation !== "group"){
+                    below.options.shaded.orientation="group";
+                    below.options.shaded.groupId=group.id;
+                  } else {
+                    group.options.shaded.orientation="group";
+                    group.options.shaded.groupId=below.id;
+                  }
+                }
+              }
+              below = group;
+            }
           }
           this._convertYcoordinates(groupsData[groupIds[i]], group);
         }
@@ -780,8 +795,8 @@ LineGraph.prototype._getRelevantData = function (groupIds, groupsData, minDate,
       // optimization for sorted data
       if (group.options.sort == true) {
         var first = Math.max(0, util.binarySearchValue(itemsData, minDate, 'x', 'before'));
-        var last = Math.min(itemsData.length, util.binarySearchValue(itemsData, maxDate, 'x', 'after'));
-        if (last < 0) {
+        var last = Math.min(itemsData.length, util.binarySearchValue(itemsData, maxDate, 'x', 'after')+1);
+        if (last <= 0) {
           last = itemsData.length;
         }
         var dataContainer = new Array(last-first);

lib/timeline/component/graph2d_types/line.js

@@ -85,7 +85,7 @@ Line.draw = function (pathArray, group, framework) {
 };
 
 Line.serializePath = function(pathArray,type,inverse){
-    if (pathArray.length <= 2){
+    if (pathArray.length < 2){
         //Too little data to create a path.
         return "";
     }