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| // Pre-render d3 force-directed graph at server side | |
| // Call node pre_render_d3_graph.js to generate d3_graph.html | |
| // Original idea and framework borrowed from https://gist.github.com/mef/7044786 | |
| var d3 = require('d3') | |
| , jsdom = require('jsdom') | |
| , fs = require('fs') | |
| , htmlStub = '<html><head> \ | |
| <style>.node { stroke: #fff; fill: #ccc; stroke-width: 1.5px; } \ | |
| .link { stroke: #333; stroke-opacity: .5; stroke-width: 1.5px; }</style> \ | |
| </head><body><div id="dataviz-container"></div><script src="js/d3.v3.min.js"></script></body></html>' | |
| jsdom.env({ | |
| features : { QuerySelector : true } | |
| , html : htmlStub | |
| , done : function(errors, window) { | |
| // this callback function pre-renders the dataviz inside the html document, then export result into a static html file | |
| var el = window.document.querySelector('#dataviz-container') | |
| , body = window.document.querySelector('body') | |
| // generate the graph | |
| var width = 600, | |
| height = 600; | |
| var force = d3.layout.force() | |
| .charge(-30) | |
| .linkDistance(30) | |
| .size([width, height]) | |
| .on("tick", tick); | |
| function tick() { | |
| node.attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| link.attr("x1", function(d) { return d.source.x; }) | |
| .attr("y1", function(d) { return d.source.y; }) | |
| .attr("x2", function(d) { return d.target.x; }) | |
| .attr("y2", function(d) { return d.target.y; }); | |
| } | |
| var svg = d3.select(el) | |
| .append('svg:svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| var nodes = [], | |
| links = []; | |
| nodes.push({id: 1, name: 'p1', group: 0}); | |
| nodes.push({id: 2, name: 'p2', group: 0}); | |
| nodes.push({id: 3, name: 'p3', group: 1}); | |
| links.push({source: 1, target: 2, value: 1}); | |
| var color = d3.scale.category20(); | |
| force.nodes(nodes) | |
| .links(links) | |
| .start(); | |
| var link = svg.selectAll(".link") | |
| .data(links) | |
| .enter().insert("line") | |
| .attr("class", "link"); | |
| var node = svg.selectAll(".node") | |
| .data(nodes) | |
| .enter().append("circle") | |
| .attr("class", "node") | |
| .attr("r", 5) | |
| .style("fill", function(d) { return color(d.group); }); | |
| // Here is the key. Without calling force.tick(), the simulation will not start and the nodes and links | |
| // will not have coordinates. | |
| for (var i = 0; i<10; i++) | |
| force.tick(); | |
| // save result in an html file | |
| fs.writeFile('d3_graph.html', window.document.innerHTML, function(err) { | |
| if(err) { | |
| console.log('error saving document', err) | |
| } else { | |
| console.log('d3_graph.html was saved!') | |
| } | |
| }) | |
| } // end jsDom done callback | |
| }) |
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Please let me know if im missing out on anything