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New York Centroid Test
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var projection = d3.geoMercator(), | |
| path = d3.geoPath(projection); | |
| d3.json("ny.json", function(error, ny) { | |
| if (error) throw error; | |
| var centroid = d3.geoCentroid(ny); | |
| projection.fitExtent([[10, 10], [width - 10, height - 10]], { | |
| type: "FeatureCollection", | |
| features: ny.features.concat({ | |
| type: "Feature", | |
| geometry: { | |
| type: "Point", | |
| coordinates: centroid | |
| } | |
| }) | |
| }); | |
| svg.append("path") | |
| .attr("fill", "black") | |
| .attr("fill-opacity", 0.2) | |
| .attr("stroke", "black") | |
| .attr("d", path(ny)); | |
| svg.append("circle") | |
| .attr("transform", "translate(" + path.centroid(ny) + ")") | |
| .attr("r", 5) | |
| .attr("fill", "red") | |
| .attr("stroke", "white"); | |
| svg.append("circle") | |
| .attr("transform", "translate(" + projection(centroid) + ")") | |
| .attr("r", 5) | |
| .attr("fill", "blue") | |
| .attr("stroke", "white"); | |
| }); | |
| </script> |
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