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May 16, 2018 11:04
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nyc_map
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| console.log(d3) | |
| var width = 960, | |
| height = 1160; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("./opendataset_borough_boundaries.geojson", (d) => {return d;}).then((NYC_MapInfo) => { | |
| console.log(NYC_MapInfo) | |
| // after loading geojson, use d3.geo.centroid to find out | |
| // where you need to center your map | |
| var center = d3.geoCentroid(NYC_MapInfo); | |
| const projection = d3.geoMercator() | |
| projection | |
| .scale(60000) | |
| .translate([width / 2, height / 2]) | |
| // .center(center); | |
| .center([-73.94, 40.70]); | |
| // now you can create new path function with | |
| // correctly centered projection | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| // and finally draw the actual polygons | |
| svg.selectAll("path") | |
| .data(NYC_MapInfo.features) | |
| .enter() | |
| .append("path") | |
| .style("fill", "steelblue") | |
| .attr("d", path); | |
| console.log(d3.geoMercator()([40.7750119, -73.948142])) | |
| svg.selectAll("circle") | |
| .data([[40.7750119, -73.948142],[40.7102956, -73.8491607], [-73.94, 40.70]]).enter() | |
| .append("circle") | |
| .attr("cx", function (d) { | |
| return projection(d)[1];; | |
| }) | |
| .attr("cy", function (d) { return projection(d)[1]; }) | |
| .attr("r", "8px") | |
| .attr("fill", "red") | |
| .attr("class", "testcircle"); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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