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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| #states { | |
| fill: #aaa; | |
| } | |
| #state-borders { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 1.5px; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| pointer-events: none; | |
| } | |
| </style> | |
| <body> | |
| <script src="https://d3js.org/d3.v5.js"></script> | |
| <script src="https://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geoAlbersUsa() | |
| .scale(1070) | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var zoom = d3.zoom() | |
| .scaleExtent([height, 8 * height]) | |
| .on("zoom", zoomed); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var g = svg.append("g") | |
| g.append("rect") | |
| .attr("class", "background") | |
| .attr("width", width) | |
| .attr("height", height); | |
| // Set up the initial identity: | |
| var transform = d3.zoomIdentity; | |
| transform.x = projection.translate()[0] | |
| transform.y = projection.translate()[1] | |
| transform.k = projection.scale() | |
| // Call the zoom and apply the initial identity: | |
| g.call(zoom) | |
| .call(zoom.transform, transform); | |
| d3.json("us.json").then(function(us) { | |
| // Draw our features: | |
| g.append("g") | |
| .attr("id", "states") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path); | |
| g.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr("id", "state-borders") | |
| .attr("d", path); | |
| }) | |
| function zoomed() { | |
| // Get the new zoom transform | |
| transform = d3.event.transform; | |
| // Apply the new transform to the projection | |
| projection.translate([transform.x,transform.y]).scale(transform.k); | |
| // Redraw the features based on the updaed projection: | |
| g.selectAll("path").attr("d", path); | |
| } | |
| </script> |
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