An implementation of a realtime event map, seen here: http://square.github.com/cube/
You can obtain states.json from the D3 website.
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Cube Realtime Map
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| var options = require("./evaluator-config"), | |
| cube = require("cube"), | |
| server = cube.server(options); | |
| server.register = function(db, endpoints) { | |
| cube.evaluator.register(db, endpoints); | |
| cube.visualizer.register(db, endpoints); | |
| endpoints.http.push(cube.endpoint.exact("/us/map", cube.endpoint.file("static/us/map.html"))); | |
| endpoints.http.push(cube.endpoint.exact("/us/states.json", cube.endpoint.file("static/us/states.json"))); | |
| }; | |
| server.start(); |
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| <!DOCTYPE html> | |
| <script src="/d3/d3.js?2.7.1"></script> | |
| <style> | |
| body { | |
| margin: 0 auto 0 auto; | |
| width: 1920px; | |
| } | |
| svg, canvas { | |
| position: absolute; | |
| } | |
| path { | |
| fill: none; | |
| stroke: #ccc; | |
| } | |
| </style> | |
| <svg width="1920" height="1080"></svg> | |
| <canvas width="1920" height="1080"></canvas> | |
| <script> | |
| var canvas = d3.select("canvas"), | |
| w = +canvas.attr("width"), | |
| h = +canvas.attr("height"); | |
| var duration = 1000 * 60 * 30, // 30 minutes | |
| start = new Date(Date.now() - duration), | |
| utc = d3.time.format.iso; | |
| var socket = new WebSocket("ws://localhost:1081/1.0/event/get"), | |
| events = []; // cache of visible events | |
| var context = canvas.node().getContext("2d"), | |
| image = context.createImageData(w, h); | |
| var projection = d3.geo.albersUsa() | |
| .scale(2000) | |
| .translate([w / 2, h / 2]); | |
| // Save as on alt-click. | |
| canvas.on("click", function() { | |
| if (d3.event.altKey) window.open(this.toDataURL()); | |
| }); | |
| // Display the states in the background. | |
| d3.json("/us/states.json", function(collection) { | |
| d3.select("svg").selectAll("path") | |
| .data(collection.features) | |
| .enter().append("path") | |
| .attr("d", d3.geo.path() | |
| .projection(projection)); | |
| }); | |
| // On open, send the event request. Here, a generic event type called "event". | |
| socket.onopen = function() { | |
| socket.send(JSON.stringify({ | |
| expression: "event(location)", | |
| start: utc(start) | |
| })); | |
| }; | |
| // On message, record the event. | |
| socket.onmessage = function(message) { | |
| var d = JSON.parse(message.data), | |
| l = d.data.location, | |
| p = projection(l), | |
| x = Math.max(0, Math.min(w - 1, Math.round(p[0]))), | |
| y = Math.max(0, Math.min(h - 1, Math.round(p[1]))), | |
| i = w * y + x, | |
| j = i << 2; | |
| d.time = new Date(d.time); | |
| d.next = events[i]; | |
| events[i] = d; | |
| image.data[j + 3] = 255; | |
| d3.timer(draw); | |
| }; | |
| // Expire old events. | |
| setInterval(function() { | |
| var i = -1, | |
| n = w * h, | |
| o, | |
| j, | |
| expire = new Date(Date.now() - duration); | |
| while (++i < n) { | |
| if ((o = events[i]) && (o.time < expire)) { | |
| image.data[(i << 2) + 3] = 0; | |
| events[i] = null; | |
| d3.timer(draw); | |
| } | |
| } | |
| }, 5000); | |
| function draw() { | |
| context.putImageData(image, 0, 0); | |
| return true; | |
| } | |
| </script> |
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