Part of a series of examples. See:
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March 13, 2024 22:46
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mousewheel-zoom + click-to-center
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| license: gpl-3.0 |
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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="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.albersUsa() | |
| .scale(1070) | |
| .translate([width / 2, height / 2]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var zoom = d3.behavior.zoom() | |
| .translate(projection.translate()) | |
| .scale(projection.scale()) | |
| .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") | |
| .call(zoom); | |
| g.append("rect") | |
| .attr("class", "background") | |
| .attr("width", width) | |
| .attr("height", height); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
| if (error) throw error; | |
| g.append("g") | |
| .attr("id", "states") | |
| .selectAll("path") | |
| .data(topojson.feature(us, us.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .on("click", clicked); | |
| g.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr("id", "state-borders") | |
| .attr("d", path); | |
| }); | |
| function clicked(d) { | |
| var centroid = path.centroid(d), | |
| translate = projection.translate(); | |
| projection.translate([ | |
| translate[0] - centroid[0] + width / 2, | |
| translate[1] - centroid[1] + height / 2 | |
| ]); | |
| zoom.translate(projection.translate()); | |
| g.selectAll("path").transition() | |
| .duration(700) | |
| .attr("d", path); | |
| } | |
| function zoomed() { | |
| projection.translate(d3.event.translate).scale(d3.event.scale); | |
| g.selectAll("path").attr("d", path); | |
| } | |
| </script> |
Hi,
Are there v4 version of these tutorials available somewhere?
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this is really great. Awesome job, @mbostock. I was curious if you knew how we could add data points (city markers etc) to this map, that stay in their "proper" location regardless of zoom level?