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d3-map-visible-area-coordinates
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .info { | |
| position: absolute; | |
| bottom: 10px; | |
| left: 10px; | |
| background-color: yellow; | |
| } | |
| </style> | |
| <body> | |
| <div id="map"> | |
| </div> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/topojson/1.6.19/topojson.js"></script> | |
| <script> | |
| winWidth = window.innerWidth; | |
| winHeight = window.innerHeight; | |
| projection = d3.geo.mercator() | |
| .translate([0, 0]) | |
| .scale(winWidth / 2 / Math.PI); | |
| zoom = d3.behavior.zoom() | |
| .scaleExtent([1, 50]) | |
| .on("zoom", manageMap); | |
| path = d3.geo.path() | |
| .projection(projection); | |
| svg = d3.select("#map").append("svg") | |
| .attr("viewBox", "0 0 " + winWidth + " " + winHeight) | |
| .attr("preserveAspectRatio", "xMidYMid meet") | |
| .append("g") | |
| .attr("transform", "translate(" + winWidth / 2 + "," + winHeight / 2 + ")") | |
| .call(zoom); | |
| info = d3.select("#map").append("div") | |
| .attr("class", "info"); | |
| g = svg.append("g") | |
| .on("mousemove", mousemoved) | |
| ; | |
| // d3.json("../mapdata/world-110m.json", function(error, world) { | |
| d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) { | |
| g.append("path") | |
| .datum(topojson.feature(world, world.objects.countries)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| g.append("path") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| function mousemoved() { | |
| info.text(getScreenBounds().join(', ')); | |
| } | |
| function getScreenBounds() { | |
| return [getPoint(0,0), getPoint()]; | |
| } | |
| function getPoint(x,y) { | |
| if (x == null) x = winWidth; | |
| if (y == null) y = winHeight; | |
| var container = g.node(); | |
| var svg = container.ownerSVGElement || container; | |
| var point = svg.createSVGPoint(); | |
| point.x = x, point.y = y; | |
| point = point.matrixTransform(container.getScreenCTM().inverse()); | |
| return formatLocation(projection.invert([point.x, point.y]), zoom.scale()); | |
| } | |
| function formatLocation(p, k) { | |
| var format = d3.format("." + Math.floor(Math.log(k) / 2 - 2) + "f"); | |
| return (p[1] < 0 ? format(-p[1]) + "°S" : format(p[1]) + "°N") + " " | |
| + (p[0] < 0 ? format(-p[0]) + "°W" : format(p[0]) + "°E"); | |
| } | |
| function manageMap() { | |
| var t = d3.event.translate, | |
| s = d3.event.scale; | |
| t[0] = Math.min(winWidth / 2 * (s - 1), Math.max(winWidth / 2 * (1 - s), t[0])); | |
| t[1] = Math.min(winHeight / 2 * (s - 1) + 230 * s, Math.max(winHeight / 2 * (1 - s) - 230 * s, t[1])); | |
| zoom.translate(t); | |
| g.style("stroke-width", 1/s).attr("transform", "translate(" + t + ")scale(" + s + ")"); | |
| svg.select("g").selectAll("circle") | |
| .style( 'fill', 'blue' ) | |
| .attr("cx", function(d) { return projection([d.lng, d.lat])[0]; }) | |
| .attr("cy", function(d) { return projection([d.lng, d.lat])[1]; }) | |
| .attr("r", 11/s); | |
| } | |
| </script> |
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