Starting from Mike's sample (https://gist.github.com/1134768) I stripped down the chart to the bare minimum to understand the physics. I use a matrix instead of a csv or json. With the console.log outputs you can look at the transformation of the matrix when fed into the stack layout.
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Most simple d3.js stack bar chart from matrix
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Simple Stack</title> | |
| <script src="http://d3js.org/d3.v2.js"></script> | |
| <style> | |
| svg { | |
| border: solid 1px #ccc; | |
| font: 10px sans-serif; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="viz"></div> | |
| <script type="text/javascript"> | |
| var w = 960, | |
| h = 500 | |
| // create canvas | |
| var svg = d3.select("#viz").append("svg:svg") | |
| .attr("class", "chart") | |
| .attr("width", w) | |
| .attr("height", h ) | |
| .append("svg:g") | |
| .attr("transform", "translate(10,470)"); | |
| x = d3.scale.ordinal().rangeRoundBands([0, w-50]) | |
| y = d3.scale.linear().range([0, h-50]) | |
| z = d3.scale.ordinal().range(["darkblue", "blue", "lightblue"]) | |
| console.log("RAW MATRIX---------------------------"); | |
| // 4 columns: ID,c1,c2,c3 | |
| var matrix = [ | |
| [ 1, 5871, 8916, 2868], | |
| [ 2, 10048, 2060, 6171], | |
| [ 3, 16145, 8090, 8045], | |
| [ 4, 990, 940, 6907], | |
| [ 5, 450, 430, 5000] | |
| ]; | |
| console.log(matrix) | |
| console.log("REMAP---------------------------"); | |
| var remapped =["c1","c2","c3"].map(function(dat,i){ | |
| return matrix.map(function(d,ii){ | |
| return {x: ii, y: d[i+1] }; | |
| }) | |
| }); | |
| console.log(remapped) | |
| console.log("LAYOUT---------------------------"); | |
| var stacked = d3.layout.stack()(remapped) | |
| console.log(stacked) | |
| x.domain(stacked[0].map(function(d) { return d.x; })); | |
| y.domain([0, d3.max(stacked[stacked.length - 1], function(d) { return d.y0 + d.y; })]); | |
| // show the domains of the scales | |
| console.log("x.domain(): " + x.domain()) | |
| console.log("y.domain(): " + y.domain()) | |
| console.log("------------------------------------------------------------------"); | |
| // Add a group for each column. | |
| var valgroup = svg.selectAll("g.valgroup") | |
| .data(stacked) | |
| .enter().append("svg:g") | |
| .attr("class", "valgroup") | |
| .style("fill", function(d, i) { return z(i); }) | |
| .style("stroke", function(d, i) { return d3.rgb(z(i)).darker(); }); | |
| // Add a rect for each date. | |
| var rect = valgroup.selectAll("rect") | |
| .data(function(d){return d;}) | |
| .enter().append("svg:rect") | |
| .attr("x", function(d) { return x(d.x); }) | |
| .attr("y", function(d) { return -y(d.y0) - y(d.y); }) | |
| .attr("height", function(d) { return y(d.y); }) | |
| .attr("width", x.rangeBand()); | |
| </script> | |
| </body> | |
| </html> |
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