First stab at drawAsInfinite.

This implementation differs from Graphite's dashboard mainly because we're still drawing
the series as data.
In the case of DAI, we'll transform the _data_ itself in the semantics of DAI, and let
the visual aspects result from it (being that the graph is drawn from ymin to ymax on > 0
data points
).

README.md

@@ -206,7 +206,8 @@ description.
     padding = the kind of padding you need
     title = box title
     label_formatter = and a formatter, as before.
-
+    as_infinite = [2] pick the 3rd (index:2) series and draw it [as
+infinite](http://graphite.readthedocs.org/en/1.0/functions.html#graphite.render.functions.drawAsInfinite)
 
 # Visuals
 

app/js/graphene.coffee

@@ -300,6 +300,7 @@ class Graphene.TimeSeriesView extends Backbone.View
     @firstrun = true
     @parent = @options.parent || '#parent'
     @null_value = 0
+    @asInfinite = @options.as_infinite || []
 
     @vis = d3.select(@parent).append("svg")
             .attr("class", "tsview")
@@ -346,6 +347,21 @@ class Graphene.TimeSeriesView extends Backbone.View
     line = d3.svg.line().x((d) -> x(d[1])).y((d) -> y(d[0]))
     area = d3.svg.area().x((d) -> x(d[1])).y0(@height - 1).y1((d) -> y(d[0]))
 
+
+    #
+    # post-processing
+    # data transofrmation for view purposes
+    #
+    # 1. DrawAsInfinite: if a series is marked as such, we'll transform
+    #    a > 0 value to infinity (here the max value in graph) or 0 otherwise.
+    #
+    di = 0
+    _.each data, (d)=>
+      if @asInfinite && _.include(@asInfinite, di)
+        _.each d.points, (p) =>
+          p[0] =  if p[0] > 0 then dmax.ymax else 0
+      di += 1
+
     #
     # get first X labels
     #