D3 bar chart - how to display positive/negative values together?

Question

I'm attempting to create a bar chart in D3 that replicates this design . The idea is that values can range from -100 to 100 and are displayed alongside each other. The scale must stay as 0-100, with colours being used to indicate whether the number is above or below 0.

I've managed to create a simple bar chart that displays positive numbers but as soon as a negative number is added, the chart breaks. The following code is used to create the x and y axis. Negative values are displayed if the x domain is changed to [-100, 100], but doing so renders the chart in a way that is too different from the original design.

  var y = d3.scaleBand()
        .range([height, 0])
        .padding(0.1);

 var x = d3.scaleLinear()
            .range([0, width]);

x.domain([0, 100])
y.domain(data.map(function(d) { return d.sentiment; }));

Can anyone provide some tips/guidance on producing a graph that looks similar to the provided design, if it's even possible? Link to my current graph can be found in the JSFiddle below:

JSFiddle

Many thanks.

Answer 1

Just use Math.abs() :

.attr("width", function(d){
    return x(Math.abs(d.value));
})

Here is the demo:

  var data = [{"sentiment":"Result","value":28},{"sentiment":"Result2","value":-56}] var margin = {top: 20, right: 20, bottom: 50, left: 70}, width = 850 - margin.left - margin.right, height = 200 - margin.top - margin.bottom; var y = d3.scaleBand() .range([height, 0]) .padding(0.1); var x = d3.scaleLinear() .range([0, width]); var svg = d3.select("#graph").append("svg") .attr("width", width + margin.left + margin.right) .attr("height", height + margin.top + margin.bottom) .append("g") .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); data.forEach(function(d) { d.value = +d.value; }); x.domain([0, 100]) y.domain(data.map(function(d) { return d.sentiment; })); svg.selectAll(".bar") .data(data) .enter().append("rect") .attr("class", "bar") .attr("width", function(d) {return x(Math.abs(d.value)); } ) .attr("y", function(d) { return y(d.sentiment) + 15; }) .attr("height", y.bandwidth()) .attr("fill", function(d) { if (d.value <= 0) { return "#FC4E5C"; } else { return "#34A232"; } }); svg.append("g") .attr("transform", "translate(0," + height + ")") .call(d3.axisBottom(x)); svg.append("g") .call(d3.axisLeft(y)); svg.append("text") .attr("class", "x label") .attr("text-anchor", "end") .attr("x", width - 300) .attr("y", height + 40) .text("Sentiment (%)"); 

 .bar { margin-top: 50px; height: 30px; } text { fill: black; font-size: 14px; } path { stroke: black; } line { stroke: black; } 

 <script src="https://d3js.org/d3.v4.min.js"></script> <script src="https://d3js.org/d3-selection-multi.v1.min.js"></script> <div id="graph"> </div>