d3.js - ds3.js Horizontal bar - How to centralise y axis? -

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i'm following mike bostock's example produce horizontal bar chart positive , negative values.

i'm trying centralise y-axis, there same length of x-axis each side. can't find examples out there. want scale of x-axis remain sensitive data, don't want specify range.

i can't example gives work. :

for quantitative scale, compute data domain (the minimum , maximum value) using d3.extent:

var x = d3.scale.linear()      .domain(d3.extent(data, function(d) { return d.value; }))      .range([0, width]);

nicing scale extend extent nearest round numbers. if want zero-value centered in middle of canvas, take greater of minimum , maximum value magnitude, or hard-code desired domain.

any examples of how correctly calculate domain or welcome!

first, let's discover 1 greater, minimum or maximum value:

var greater;  if (math.abs(d3.min(data, function(d){ return d.value})) > math.abs(d3.max(data, function(d){ return d.value}))) {   greater = math.abs(d3.min(data, function(d){ return d.value}));   } else {   greater = math.abs(d3.max(data, function(d){ return d.value}));   };

and set scale:

var x = d3.scale.linear()  .domain([greater * -1, greater])  .range([0, width]);

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