This example uses d3.behavior.zoom with a dynamic projection for map panning and zooming. This approach is slower than using a transform or transforming pre-projected geometry because it requires reprojecting whenever the zoom changes.
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February 23, 2017 08:32
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Map Pan & Zoom II
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| svg { | |
| background: #eee; | |
| } | |
| .sphere { | |
| fill: #fff; | |
| } | |
| .land { | |
| fill: #000; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-linejoin: round; | |
| stroke-linecap: round; | |
| vector-effect: non-scaling-stroke; | |
| } | |
| .overlay { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| </style> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <body> | |
| <script> | |
| var width = 960, | |
| height = 960, | |
| scale0 = (width - 1) / 2 / Math.PI; | |
| var projection = d3.geo.mercator(); | |
| var zoom = d3.behavior.zoom() | |
| .translate([width / 2, height / 2]) | |
| .scale(scale0) | |
| .scaleExtent([scale0, 8 * scale0]) | |
| .on("zoom", zoomed); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .append("g"); | |
| var g = svg.append("g"); | |
| svg.append("rect") | |
| .attr("class", "overlay") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg | |
| .call(zoom) | |
| .call(zoom.event); | |
| d3.json("/mbostock/raw/4090846/world-110m.json", function(error, world) { | |
| if (error) throw error; | |
| g.append("path") | |
| .datum({type: "Sphere"}) | |
| .attr("class", "sphere") | |
| .attr("d", path); | |
| g.append("path") | |
| .datum(topojson.merge(world, world.objects.countries.geometries)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| g.append("path") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| function zoomed() { | |
| projection | |
| .translate(zoom.translate()) | |
| .scale(zoom.scale()); | |
| g.selectAll("path") | |
| .attr("d", path); | |
| } | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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