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POd3.js - how to automatically calculate arc lengths in radial dendrogram
 

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  1. POd3.js - how to automatically calculate arc lengths in radial dendrogram
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    <p>I'm creating a modified version of Mike Bostock's hierarchical edge bundling diagram:</p> <p><a href="http://mbostock.github.com/d3/talk/20111116/bundle.html" rel="nofollow noreferrer">http://mbostock.github.com/d3/talk/20111116/bundle.html</a></p> <p>but I want to make arcs which span certain groups of data, like this:</p> <p><img src="https://i.stack.imgur.com/TTk5m.png" alt="enter image description here"></p> <p>I'm currently just hardcoding the length of the arc, but I want to do it dynamically. How can I accomplish this? Here's my current code:</p> <pre><code>/* MH - USER DEFINED VARIABLES */ var chartConfig = { "Tension" : .85, "canvasSize" : 800, "dataFile" : "../data/projects.json", "linePadding" : 160, "textPadding" : 30, "arcPadding" : 5, "arcWidth" : 30 } var pi = Math.PI; var radius = chartConfig.canvasSize / 2, splines = []; var cluster = d3.layout.cluster() //Cluster is the diagram style, a node to link dendrogram dendrogram (tree diagram) .size([360, radius - chartConfig.linePadding]); //MH - sets the size of the circle in relation to the size of the canvas var bundle = d3.layout.bundle(); //Bundles the node link lines so that they spread at the end but keep close initially var arcInner = radius - chartConfig.linePadding + chartConfig.arcPadding; var arcOuter = arcInner + chartConfig.arcWidth; var arc = d3.svg.arc().innerRadius(arcInner).outerRadius(arcOuter); var line = d3.svg.line.radial() .interpolate("bundle") .tension(chartConfig.Tension) //How tightly to bundle the lines. No tension creates straight lines .radius(function(d) { return d.y; }) .angle(function(d) { return d.x / 180 * Math.PI; }); var vis = d3.select("#chart").append("svg") .attr("width", radius * 2) .attr("height", radius * 2) .attr("class","svg") .append("g") .attr("class","chart") .attr("transform", "translate(" + radius + "," + radius + ")"); d3.json(chartConfig.dataFile, function(classes) { var nodes = cluster.nodes(packages.root(classes)), links = packages.imports(nodes), splines = bundle(links); var path = vis.selectAll ("path.link") .data(links) .enter().append("path") .attr("class", function(d){ return "link source-" + d.source.key + " target-" + d.target.key; }) .attr("d", function(d,i){ return line(splines[i]); }); vis.selectAll("g.node") .data(nodes.filter(function(n) { return !n.children; })) .enter().append("g") .attr("class", "node") .attr("id",function(d){ return "node-" + d.key; }) .attr("transform", function(d) { return "rotate(" + (d.x - 90) + ")translate(" + d.y + ")"; }) .append("text") .attr("dx", function(d) { return d.x &lt; 180 ? chartConfig.textPadding : -chartConfig.textPadding; }) //dx Moves The text out away from the lines in a positive or negative direction, depending on which side of the axis it is on .attr("dy", ".31em") //moves the text up or down radially around the circle .attr("text-anchor", function(d) { return d.x &lt; 180 ? "start" : "end"; }) .attr("transform", function(d) { return d.x &lt; 180 ? null : "rotate(180)"; }) .text(function(d) { textString = d.key; textString = textString.split('_').join(' '); //MH replace underscores with spaces return textString; }) .on("mouseover",textOver) .on("mouseout",textOut); }); /* ARCS ARE HARDCODED, SHOULD BE DYNAMIC */ var arcData = [ {aS: 0, aE: 45,rI:radius - chartConfig.linePadding + chartConfig.arcPadding,rO:radius - chartConfig.linePadding + chartConfig.textPadding-chartConfig.arcPadding} ]; var arcJobsData = d3.svg.arc().innerRadius(arcData[0].rI).outerRadius(arcData[0].rO).startAngle(degToRad(1)).endAngle(degToRad(15)); var g = d3.select(".chart").append("svg:g").attr("class","arcs"); var arcJobs = d3.select(".arcs").append("svg:path").attr("d",arcJobsData).attr("id","arcJobs").attr("class","arc"); g.append("svg:text").attr("x",3).attr("dy",15).append("svg:textPath").attr("xlink:href","#arcJobs").text("JOBS").attr("class","arcText"); //x shifts x pixels from the starting point of the arc. dy shifts the text y units from the top of the arc ... function degToRad(degrees){ return degrees * (pi/180); } function updateNodes(name,value){ return function(d){ if (value) this.parentNode.appendChild(this); vis.select("#node-"+d[name].key).classed(name,value); } } </code></pre>
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    1. COHi, I'm trying to do the same thing... I'm just curious if you have found the solution? Or you know where the source code is perhaps? I think I've seen it somewhere, but couldn't find it now... Thanks :)
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    2. CONope - but I promise to let you know if I find something if you do the same!
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    3. COcan you set up a jsFiddle or [Tributary](http://enjalot.com/tributary/) I think a clever application of nest and a scale will fill in the pieces you are looking for. I would be happy to see what I can do, but the data would help!
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