Test with d3-composite-projection and preprojected TopoJSON
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September 13, 2019 09:24
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d3-composite-projections test
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| border:none | |
| height:700 |
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| <!DOCTYPE html> <svg></svg> | |
| <script src="https://unpkg.com/d3-composite-projections"></script> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script src="https://d3js.org/topojson.v3.min.js"></script> | |
| <style> | |
| #info { | |
| top: 0; | |
| left: 0; | |
| position: absolute; | |
| padding: 1rem; | |
| font-family: sans-serif; | |
| } | |
| #info.error { | |
| color: brown; | |
| } | |
| #error { | |
| margin-top: 0.5rem; | |
| font-weight: bold; | |
| visibility: hidden; | |
| } | |
| path { | |
| fill: none; | |
| } | |
| </style> | |
| <div id="info"> | |
| <div id="coords"></div> | |
| <div id="error">Error</div> | |
| </div> | |
| <script> | |
| const margin = { top: 20, right: 20, bottom: 20, left: 20 }, | |
| width = window.innerWidth - margin.left - margin.right, | |
| height = width * 0.8 - margin.top - margin.bottom; | |
| const info = d3.select("#info"); | |
| const error = d3.select("#error"); | |
| const svg = d3 | |
| .select("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("https://unpkg.com/[email protected]/es/autonomous_regions.json") | |
| .then(es => { | |
| const projection = d3 | |
| .geoConicConformalSpain() | |
| .fitSize( | |
| [width - margin.left - margin.right, height], | |
| topojson.feature(es, es.objects.autonomous_regions) | |
| ); | |
| const path = d3.geoPath(projection); | |
| svg | |
| .append("path") | |
| .datum(topojson.feature(es, es.objects.autonomous_regions)) | |
| .attr("d", d => path(d)) | |
| .attr("fill", "none") | |
| .attr("stroke", "black") | |
| .attr("stroke-linejoin", "round"); | |
| svg | |
| .append("path") | |
| .attr("d", projection.getCompositionBorders()) | |
| .attr("fill", "none") | |
| .attr("stroke", "brown") | |
| .attr("stroke-dasharray", "10 5"); | |
| const coords = []; | |
| svg.on("mousemove", function() { | |
| const data = projection.invert(d3.mouse(this)); | |
| d3.select("#coords").html(data); | |
| if (projection(data)) { | |
| coords.push(data); | |
| info.classed("error", false); | |
| error.style("visibility", "hidden"); | |
| update(); | |
| } else { | |
| info.classed("error", true); | |
| error.style("visibility", "visible"); | |
| } | |
| }); | |
| function update() { | |
| svg | |
| .selectAll("circle") | |
| .data(coords) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", function(d) { | |
| return projection(d)[0]; | |
| }) | |
| .attr("cy", function(d) { | |
| return projection(d)[1]; | |
| }) | |
| .attr("opacity", 0.5) | |
| .attr("stroke", 1) | |
| .attr("fill", "brown") | |
| .attr("r", 5) | |
| .transition() | |
| .attr("r", 2); | |
| } | |
| }) | |
| .catch(err => console.warn(err)); | |
| </script> |
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