javascript - d3 convert bar chart to grouped bar chart -


i have d3 bar chart lists data based on date in order day. works great, need display 2 sets of data per day, in grouped bar chart format or side-by-side bars.

i'm thinking take bit of refactoring after fooling , referencing bunch of examples i've found on net, fact chart using timescale , linear scale throws wrench in understanding of this. i'm hoping can show me way making chart show 2 bars each day in chart.

my current x axis setup:

var xtimescale = d3.time.scale(). domain([new date(data[0].date), d3.time.day.offset(new date(data[data.length - 1].date), 1)]) .range([0, width]);  var xscale = d3.scale.linear() .domain([0, data.length]) .range([0, width]);

my fiddle: http://jsfiddle.net/mmejf/45/

so 2 separate sets of data, need have 2 bars per day - each bar representing value each data set. how can accomplish displaying grouped bars? , better if datasets combined one?

first, lets think 2 separate graphs of 2 sets of data. scales same. this:

http://jsfiddle.net/mmejf/50/

ok. that's , good, how there stacked chart?

well, need make sure each tick has both pieces of data.

then, when plotting each tick, should have first piece of data plotted 0, , second should plotted not zero, offset amount of first data.

with in mind, other pieces fall place: y axis must 0 max of sum of 2 pieces of data.

var data = [{"year":2013,"month":3,"day":5,"count1":18, "count2":3},             {"year":2013,"month":3,"day":6,"count1":3, "count2":11},             {"year":2013,"month":3,"day":7,"count1":10,"count2": 8},              {"year":2013,"month":3,"day":8,"count1":18, "count2": 4}];  var maxvalue = d3.max(data, function (d) {   return d.count1 + d.count2; });  var yscale = d3.scale.linear()   .domain([0, maxvalue])   .range([0, height]);

now, it's easier treat each set of bars group, , add bars group:

   var bars = svg.selectall(".bar")       .data(data).enter()       .append("g")       .attr("class","bar")       .attr("transform", function(d){         return "translate("+xtimescale(d.date)+",0)"       });      var count1bars = bars.append("rect")       .attr("class", "count1")       .attr("height", function(d){return yscale(d.count1)})       .attr("y", function(d){return height - yscale(d.count1)})       .attr("width", barwidth);      var count2bars = bars.append("rect")       .attr("class", "count2")       .attr("height", function(d){return yscale(d.count2)})       .attr("y", function(d){return height - yscale(d.count1) -yscale(d.count2)})       .attr("width", barwidth);      var count1text = bars.append("text")       .text(function(d){return d.count1})       .attr("y", function(d){return height})       .attr("x", barwidth / 2);      var count2text = bars.append("text")       .text(function(d){return d.count2})       .attr("y", function(d){return height - yscale(d.count1)})       .attr("x", barwidth / 2);

now, rough example on way: http://jsfiddle.net/mmejf/49/

good luck! think need, , things tend fall place there!


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