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TopoJSON => GeoJSON tool
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| #load { | |
| width: 45%; | |
| height: 100%; | |
| float: left; | |
| font-family: Monospace; | |
| margin: 5px; | |
| -webkit-user-select: none; | |
| -moz-user-select: none; | |
| user-select: none; | |
| line-height: 24px; | |
| } | |
| #meta { | |
| } | |
| #url { | |
| margin-top: 10px; | |
| width: calc(100% - 55px); | |
| } | |
| .example { | |
| font-size: 10px; | |
| font-weight: bold; | |
| margin: 5px; | |
| cursor: pointer; | |
| } | |
| .example:hover { | |
| text-decoration: underline; | |
| } | |
| #geojson { | |
| width: 45%; | |
| height: 100%; | |
| float: right; | |
| overflow: scroll; | |
| } | |
| #out { | |
| margin: 10px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="load"> | |
| <input id="url"> | |
| <button id="loadurl">Load</button> | |
| <br>or <span id="examples"></span> | |
| <br> | |
| <input id="loadfile" type="file"> | |
| <br> | |
| <div id="meta"> | |
| </div> | |
| </div> | |
| <div id="geojson"> | |
| <pre id="out"></pre> | |
| </div> | |
| <script> | |
| d3.select("#loadurl").on("click", loadUrl); | |
| d3.select("#url").on("keydown", function() { | |
| if(d3.event.code === "Enter") { | |
| loadUrl() | |
| } | |
| }) | |
| d3.select("#loadfile").node() | |
| .addEventListener('change', loadFile, false); | |
| var examples = [ | |
| {"name": "World countries", url: "http://enjalot.github.io/wwsd/data/world/ne_50m_admin_0_countries.topojson"}, | |
| {"name": "California streams", url:"http://enjalot.github.io/wwsd/data/USA/california-streams.topojson"}, | |
| {"name": "London tube stations", url: "http://enjalot.github.io/wwsd/data/UK/london_stations.topojson"} | |
| ] | |
| d3.select("#examples").selectAll("a.example") | |
| .data(examples) | |
| .enter().append("a").classed("example", true) | |
| .text(function(d) { return d.name}) | |
| .on("click", function(d) { | |
| d3.select("#url").node().value = d.url; | |
| loadUrl(d.url) | |
| }) | |
| var load = d3.select("#load").node() | |
| load.addEventListener("dragover", handleDragOver, false) | |
| load.addEventListener("drop", loadFile, false); | |
| function handleDragOver(evt) { | |
| evt.stopPropagation(); | |
| evt.preventDefault(); | |
| evt.dataTransfer.dropEffect = 'copy'; | |
| } | |
| function loadFile(evt) { | |
| evt.stopPropagation(); | |
| evt.preventDefault(); | |
| d3.select("pre#out").text("LOADING") | |
| var files; | |
| if(evt.dataTransfer) { | |
| files = evt.dataTransfer.files; | |
| } else { | |
| files = evt.target.files; | |
| } | |
| var reader = new FileReader(); | |
| reader.onload = function(e) { | |
| convert(JSON.parse(e.target.result)) | |
| } | |
| reader.readAsText(files[0]) | |
| } | |
| function convert(topo) { | |
| console.log("topojson:", topo) | |
| var keys = Object.keys(topo.objects); | |
| d3.select("#meta").html(keys.length + " objects: " + keys.join("<br>")) | |
| var geo = topojson.feature(topo, topo.objects[keys[0]]) | |
| console.log("geojson", geo) | |
| renderJSON(null, geo, true) | |
| } | |
| function loadUrl() { | |
| var url = d3.select("#url").node().value; | |
| d3.select("pre#out").text("LOADING") | |
| d3.json(url, function(err, topo) { | |
| if(err) { | |
| return renderJSON(err); | |
| } | |
| convert(topo) | |
| }) | |
| } | |
| function renderJSON(err, json, pretty) { | |
| var pre = d3.select("pre#out") | |
| if(err) { | |
| pre.classed("error", true) | |
| pre.text(JSON.stringify(err, null, 2)) | |
| } else { | |
| pre.classed("error", false) | |
| pre.text(JSON.stringify(json, null, pretty ? 2 : 0)); | |
| } | |
| } | |
| </script> | |
| </body> |
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