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The example you based your code upon deeply intertwines sliding the x-axis and adding data. It works fine when you poll something as in the example, not so much with data arriving on a different interval or at random like I suppose it does in your websocket setup (see <a href="http://jsfiddle.net/K8rub/1/" rel="nofollow">http://jsfiddle.net/K8rub/1/</a> for an hopefully accurate reproduction of your code) The first thing to do is to separate the sliding (the <code>tick</code> function) and the data injection: <a href="http://jsfiddle.net/K8rub/2/" rel="nofollow">http://jsfiddle.net/K8rub/2/</a> : each datum has a timestamp which is used to extract the x value, the data is initially empty and <code>tick</code> only slides the graph. Applying these modifications to your code, we get <pre><code>TimeseriesView = Backbone.View.extend({ initialize: function (options) { _.bindAll(this, 'tick'); // ... self.dataSet = options.dataSet; self.dataSet.on('add', this.newPoint, this); self.tick(); }, newPoint: function(model) { this.data.push(model); }, tick: function () { var self = this; self.now = new Date(); var now = self.now; var duration = self.duration; var n = self.n; var x = self.x; var y = self.y; var width = this.width; var height = this.height; x.axis = d3.svg.axis().scale(x).orient("bottom"); // update the domains self.x.domain([now - (n - 2) * duration, now - duration]); self.y.domain([0, d3.max(self.dataSet.pluck('auth_amt'))]); self.line = d3.svg.line() .x(function(d) { return x(d.get('stamp')); }) .y(function(d) { return y(d.get('auth_amt')); }); // redraw the line d3.select(".line") .attr("d", self.line) .attr("transform", null); // slide the x-axis to the left self.axis.transition() .duration(duration) .ease("linear") .call(x.axis); self.x = d3.time.scale() .domain([now - (n-2) * duration, now - duration]) .range([0, width]); var x = self.x; // slide the line left self.path.transition() .duration(duration) .ease("linear") .attr("transform", "translate(" + x(now - (n - 1) * duration) + ")") .each("end", self.tick); } }); </code></pre> <a href="http://jsfiddle.net/K8rub/4/" rel="nofollow">http://jsfiddle.net/K8rub/4/</a>
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1. POReal-time D3 timeseries using Backbone -- graph moves slower than axis
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