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+/* Flot plugin for thresholding data.
+
+Copyright (c) 2007-2014 IOLA and Ole Laursen.
+Licensed under the MIT license.
+
+The plugin supports these options:
+
+	series: {
+		threshold: {
+			below: number
+			color: colorspec
+		}
+	}
+
+It can also be applied to a single series, like this:
+
+	$.plot( $("#placeholder"), [{
+		data: [ ... ],
+		threshold: { ... }
+	}])
+
+An array can be passed for multiple thresholding, like this:
+
+	threshold: [{
+		below: number1
+		color: color1
+	},{
+		below: number2
+		color: color2
+	}]
+
+These multiple threshold objects can be passed in any order since they are
+sorted by the processing function.
+
+The data points below "below" are drawn with the specified color. This makes
+it easy to mark points below 0, e.g. for budget data.
+
+Internally, the plugin works by splitting the data into two series, above and
+below the threshold. The extra series below the threshold will have its label
+cleared and the special "originSeries" attribute set to the original series.
+You may need to check for this in hover events.
+
+*/
+
+(function ($) {
+    var options = {
+        series: { threshold: null } // or { below: number, color: color spec}
+    };
+    
+    function init(plot) {
+        function thresholdData(plot, s, datapoints, below, color) {
+            var ps = datapoints.pointsize, i, x, y, p, prevp,
+                thresholded = $.extend({}, s); // note: shallow copy
+
+            thresholded.datapoints = { points: [], pointsize: ps, format: datapoints.format };
+            thresholded.label = null;
+            thresholded.color = color;
+            thresholded.threshold = null;
+            thresholded.originSeries = s;
+            thresholded.data = [];
+ 
+            var origpoints = datapoints.points,
+                addCrossingPoints = s.lines.show;
+
+            var threspoints = [];
+            var newpoints = [];
+            var m;
+
+            for (i = 0; i < origpoints.length; i += ps) {
+                x = origpoints[i];
+                y = origpoints[i + 1];
+
+                prevp = p;
+                if (y < below)
+                    p = threspoints;
+                else
+                    p = newpoints;
+
+                if (addCrossingPoints && prevp != p && x != null
+                    && i > 0 && origpoints[i - ps] != null) {
+                    var interx = x + (below - y) * (x - origpoints[i - ps]) / (y - origpoints[i - ps + 1]);
+                    prevp.push(interx);
+                    prevp.push(below);
+                    for (m = 2; m < ps; ++m)
+                        prevp.push(origpoints[i + m]);
+                    
+                    p.push(null); // start new segment
+                    p.push(null);
+                    for (m = 2; m < ps; ++m)
+                        p.push(origpoints[i + m]);
+                    p.push(interx);
+                    p.push(below);
+                    for (m = 2; m < ps; ++m)
+                        p.push(origpoints[i + m]);
+                }
+
+                p.push(x);
+                p.push(y);
+                for (m = 2; m < ps; ++m)
+                    p.push(origpoints[i + m]);
+            }
+
+            datapoints.points = newpoints;
+            thresholded.datapoints.points = threspoints;
+            
+            if (thresholded.datapoints.points.length > 0) {
+                var origIndex = $.inArray(s, plot.getData());
+                // Insert newly-generated series right after original one (to prevent it from becoming top-most)
+                plot.getData().splice(origIndex + 1, 0, thresholded);
+            }
+                
+            // FIXME: there are probably some edge cases left in bars
+        }
+        
+        function processThresholds(plot, s, datapoints) {
+            if (!s.threshold)
+                return;
+            
+            if (s.threshold instanceof Array) {
+                s.threshold.sort(function(a, b) {
+                    return a.below - b.below;
+                });
+                
+                $(s.threshold).each(function(i, th) {
+                    thresholdData(plot, s, datapoints, th.below, th.color);
+                });
+            }
+            else {
+                thresholdData(plot, s, datapoints, s.threshold.below, s.threshold.color);
+            }
+        }
+        
+        plot.hooks.processDatapoints.push(processThresholds);
+    }
+    
+    $.plot.plugins.push({
+        init: init,
+        options: options,
+        name: 'threshold',
+        version: '1.2'
+    });
+})(jQuery);