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Projection detection
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| <!DOCTYPE html> | |
| <!--[if lt IE 7]> <html class="no-js lt-ie9 lt-ie8 lt-ie7"> <![endif]--> | |
| <!--[if IE 7]> <html class="no-js lt-ie9 lt-ie8"> <![endif]--> | |
| <!--[if IE 8]> <html class="no-js lt-ie9"> <![endif]--> | |
| <!--[if gt IE 8]><!--> <html class="no-js"> <!--<![endif]--> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> | |
| <title></title> | |
| <meta name="description" content=""> | |
| <meta name="viewport" content="width=device-width"> | |
| <link rel="stylesheet" href="map.css"> | |
| <script src="http://d3js.org/d3.v3.js" charset="utf-8"></script> | |
| </head> | |
| <body> | |
| <div id="projectionSelectionContainer"> | |
| <label for="projectionSelection">Projection : <br></label> | |
| <select id="projectionSelection"><option>mercator</option><option>equirectangular</option><option>orthographic</option></select> | |
| </div> | |
| <script src="map.js"></script> | |
| <script src="ui.js"></script> | |
| <script type="text/javascript"> | |
| showMap("background", "ne_110m_coastline.json"); | |
| </script> | |
| </body> | |
| </html> |
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| body { | |
| white-space: nowrap; | |
| } | |
| #map, #externalSvg { | |
| left: 200px; | |
| float: left; | |
| } | |
| .subunit-label { | |
| fill: #777; | |
| fill-opacity: .5; | |
| font-size: 14px; | |
| font-weight: 300; | |
| text-anchor: middle; | |
| } | |
| .subunit-boundary { | |
| fill: none; | |
| stroke: #777; | |
| stroke-dasharray: 2,2; | |
| stroke-linejoin: round; | |
| } | |
| #externalSvg { | |
| opacity: 0.5; | |
| } |
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| var width = 480; | |
| var mapHeight = 440; | |
| var projection; | |
| var path; | |
| var zoom; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", mapHeight) | |
| .attr("name", "German_Empire_1914") | |
| .attr("id", "externalSvg") | |
| .attr("viewBox", "0 0 2050 1213") | |
| .attr("preserveAspectRatio", "xMaxYMax meet"); | |
| var backgroundSvg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", mapHeight) | |
| .attr("id", "bgMap") | |
| .datum({x: 0, y: 0}); | |
| var projectionSelection = d3.select('#projectionSelection'); | |
| projectionSelection.on('change', function() { | |
| applyProjection(getSelectedProjection()); | |
| }); | |
| function getSelectedProjection() { | |
| return d3.select(projectionSelection.node().options[projectionSelection.node().selectedIndex]).html(); | |
| } | |
| d3.xml("Map_of_Ancient_Rome_271_AD.svg", "image/svg+xml", function(xml) { | |
| d3.select( | |
| svg | |
| .append("g") | |
| .node() | |
| .appendChild(document.importNode(xml.documentElement, true))); | |
| }); | |
| function showMap(id, filePath) { | |
| d3.json(filePath, function(error, world) { | |
| backgroundSvg.append("g") | |
| .attr("id", id) | |
| .selectAll(".subunit") | |
| .data(world.features) | |
| .enter().append("path") | |
| .attr("class", function(d) { | |
| return "subunit-boundary subunit " + d.properties.adm0_a3; | |
| }); | |
| applyProjection('mercator'); | |
| }); | |
| } | |
| function applyProjection(name) { | |
| projection = d3.geo[name]() | |
| .scale(width *2 / Math.PI) | |
| .precision(.01) | |
| .center([40, 10]); | |
| path = d3.geo.path() | |
| .projection(projection); | |
| zoom = d3.behavior.zoom() | |
| .translate(projection.translate()) | |
| .scale(projection.scale()) | |
| .on("zoom", function() { | |
| projection.scale(d3.event.scale); | |
| backgroundSvg.selectAll("path").attr("d", path); | |
| }); | |
| backgroundSvg | |
| .call(bgSvgmap_drag) | |
| .call(zoom) | |
| .selectAll('path.subunit').attr("d", path); | |
| } |
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| var bgMapDragState; | |
| var bgSvgmap_drag = d3.behavior.drag() | |
| .origin(function(d) { return d; }) | |
| .on("dragstart", bgMapDragStarted) | |
| .on("drag", bgMapDragMove); | |
| var lambda = d3.scale.linear() | |
| .domain([0, width]) | |
| .range([-180, 180]); | |
| var phi = d3.scale.linear() | |
| .domain([0, mapHeight]) | |
| .range([90, -90]); | |
| function bgMapDragStarted() { | |
| bgMapDragState = 'inactive'; | |
| } | |
| function bgMapDragMove(d) { | |
| if (d3.event && d3.event.dx && d3.event.dy) { | |
| bgMapDragState = 'drag'; | |
| } | |
| d.x = (d.x || d3.event.sourceEvent.pageX) + (d3.event ? d3.event.dx : 0); | |
| d.y = (d.y || d3.event.sourceEvent.pageY) + (d3.event ? d3.event.dy : 0); | |
| projection.rotate([lambda(d.x), phi(d.y)]); | |
| } |
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