Just a simple reminder that a topology is a network. This takes a topojson world map of countries and uses topojson.neighbors to populate an edge list and topojson.feature to populate a node list and bind that to a traditional force-directed network.
Last active
August 29, 2015 13:58
-
-
Save emeeks/9980626 to your computer and use it in GitHub Desktop.
Topojson Import into Force-Directed
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <html xmlns="http://www.w3.org/1999/xhtml"> | |
| <head> | |
| <title>topojson import into force directed network</title> | |
| <meta charset="utf-8" /> | |
| </head> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <style> | |
| </style> | |
| <body onload="forceDirected();"> | |
| <div id="vizcontainer"> | |
| <svg style="width:500px;height:500px;border:1px lightgray solid;" /> | |
| </div> | |
| <div id="controls"> | |
| </div> | |
| <footer> | |
| <script> | |
| function forceDirected() { | |
| d3.json("world.json", createForceLayout) | |
| function createForceLayout(world) { | |
| var nodes = topojson.feature(world, world.objects.countries).features; | |
| var neighbors = topojson.neighbors(world.objects.countries.geometries); | |
| var edges = []; | |
| console.log(nodes); | |
| var nodeHash = {}; | |
| for (x in nodes) { | |
| nodeHash[x] = nodes[x]; | |
| } | |
| for (x in neighbors) { | |
| for (y in neighbors[x]) { | |
| var newEdge = {source: nodeHash[x], target: nodeHash[neighbors[x][y]]}; | |
| edges.push(newEdge); | |
| } | |
| } | |
| force = d3.layout.force() | |
| .charge(-20) | |
| .gravity(.05) | |
| .linkDistance(10) | |
| .size([500,500]).nodes(nodes) | |
| .links(edges).on("tick", forceTick); | |
| d3.select("svg").selectAll("line.link").data(edges).enter() | |
| .append("line") | |
| .attr("class", "link") | |
| .style("stroke", "black") | |
| .style("opacity", .5) | |
| .style("stroke-width", 1); | |
| var nodeEnter = d3.select("svg").selectAll("g.node").data(nodes).enter() | |
| .append("g") | |
| .attr("class", "node") | |
| .call(force.drag()) | |
| .on("click", fixNode); | |
| function fixNode(d) { | |
| d3.select(this).select("circle").style("stroke-width", 4); | |
| d.fixed = true; | |
| } | |
| nodeEnter.append("circle") | |
| .attr("r", 1) | |
| .style("fill", "lightgray") | |
| .style("stroke", "black") | |
| .style("stroke-width", "1px"); | |
| nodeEnter.append("text") | |
| .style("text-anchor", "middle") | |
| .attr("y", 15) | |
| // The topojson data file I'm using doesn't have names... | |
| // .text(function(d) {return d.properites.name}) | |
| force.start(); | |
| function forceTick() { | |
| d3.selectAll("line.link") | |
| .attr("x1", function (d) {return d.source.x}) | |
| .attr("x2", function (d) {return d.target.x}) | |
| .attr("y1", function (d) {return d.source.y}) | |
| .attr("y2", function (d) {return d.target.y}); | |
| d3.selectAll("g.node") | |
| .attr("transform", function (d) {return "translate("+d.x+","+d.y+")"}) | |
| } | |
| function sizeByDegree() { | |
| force.stop(); | |
| d3.selectAll("circle") | |
| .attr("r", function(d) {return d.weight * .2}) | |
| } | |
| d3.select("#controls").append("button").on("click", sizeByDegree).html("Degree Size"); | |
| } | |
| } | |
| </script> | |
| </footer> | |
| </body> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment