d3.js - evenly spaced bars on a time scale

Question

I\'m building a bar plot in d3.js in which each bar represents total TB cases during a month. The data essentially consists of a date (initially strings in %Y-%m format, bu

Answer 1

You can combine ordinal and time scales:

// Use this to draw x axis
var xScaleDate = d3.time.scale()
    .domain(d3.extent(thisstat, function(d) { return d.date; }))
    .range([0, width - margin.left - margin.right]);

// Add an ordinal scale
var ordinalXScale = d3.scale.ordinal()
    .domain(d3.map(thisstat, function(d) { return d.date; }))
    .rangeBands([0, width], 0.4, 0);

// Now you can use both of them to space columns evenly:
columnGroup.enter()
    .append("rect")
    .attr("class", "column")
    .attr("width", ordinalXScale.rangeBand())
    .attr("height", function (d) {
        return height - yScale(d.value);
    })
    .attr("x", function (d) {
        return xScaleDate(d.date);
    })
    .attr("y", function (d){
        return yScale(d.value);
    });

I've created an example a while ago to demonstrate this approach: http://codepen.io/coquin/pen/BNpQoO