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Calibration-check points using Leaflet and D3
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Calibration-check points using Leaflet and D3</title> | |
| <!-- Points are London O2 Arena, Washington Monument, Cape Town Stadium and the Sydney Opera House --> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.6.4/leaflet.css" /> | |
| <!--[if lte IE 8]> | |
| <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.6.4/leaflet.ie.css" /> | |
| <![endif]--> | |
| <style> | |
| #mapA | |
| { | |
| border:2px solid; | |
| border-radius:0; | |
| height: 99.5%; | |
| } | |
| html, body { height: 100%; width: 100%; margin: 0; } | |
| </style> | |
| <link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" /> | |
| <script src="http://cdn.leafletjs.com/leaflet-0.6.4/leaflet.js"></script> | |
| <script src="http://d3js.org/d3.v3.js" charset="utf-8"></script> | |
| <!--<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>--> | |
| <script src="http://codeorigin.jquery.com/jquery-2.0.3.min.js"></script> | |
| </head> | |
| <body> | |
| <p id="mapA" height: 100%></p> | |
| <script> | |
| // Function to check JSON is valid | |
| geogjnfile = 'reference_points.geojson'; | |
| function validateJSON() | |
| { | |
| $.ajax({ | |
| url: 'http://geojsonlint.com/validate', | |
| type: 'POST', | |
| data: geogjnfile, | |
| dataType: 'json', | |
| success: processSuccess, | |
| error: processError | |
| }); | |
| } | |
| function processSuccess() {console.log("JSON OK");} | |
| function processError() {console.log("JSON Invalid");} | |
| validateJSON(); | |
| var markersOnMap = []; | |
| var cloudmadeUrl = 'http://{s}.tile.cloudmade.com/BC9A493B41014CAABB98F0471D759707/{styleId}/256/{z}/{x}/{y}.png', | |
| cloudmadeAttribution = ' 2013 CloudMade'; | |
| var minimal = L.tileLayer(cloudmadeUrl, {styleId: 22677, attribution: cloudmadeAttribution}), | |
| midnight = L.tileLayer(cloudmadeUrl, {styleId: 999, attribution: cloudmadeAttribution}); | |
| var map = L.map('mapA', { | |
| center: new L.LatLng(20, 0), | |
| zoom: 2, | |
| layers: [minimal] | |
| }); | |
| var svg = d3.select(map.getPanes().overlayPane).append("svg"), | |
| g = svg.append("g").attr("class", "leaflet-zoom-hide"); | |
| d3.json("reference_points.geojson", function(collection) { | |
| function project(x) { | |
| var point = map.latLngToLayerPoint(new L.LatLng(x[1], x[0])); | |
| return [point.x, point.y]; | |
| } | |
| var path = d3.geo.path().projection(project); | |
| var feature = g.selectAll("path") | |
| .data(collection.features) | |
| .enter().append("path"); | |
| feature.attr("d", path); | |
| var bounds = d3.geo.bounds(collection), | |
| bottomLeft = project(bounds[0]), | |
| topRight = project(bounds[1]); | |
| svg .attr("width", topRight[0] - bottomLeft[0]) | |
| .attr("height", bottomLeft[1] - topRight[1]) | |
| .style("margin-left", bottomLeft[0] + "px") | |
| .style("margin-top", topRight[1] + "px"); | |
| g .attr("transform", "translate(" + -bottomLeft[0] + "," + -topRight[1] + ")"); | |
| }); | |
| var baseMaps = { | |
| "Minimal": minimal, | |
| "Night View": midnight | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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