A variant of the Zoom to Bounding Box example that uses zoom transitions to smoothly interpolate between different views. This example also allows you to freely pan and zoom with the mouse (or touch).
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August 5, 2019 23:43
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Zoom to Bounding Box II
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| license: gpl-3.0 | |
| redirect: https://observablehq.com/@d3/zoom-to-bounding-box |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .background { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| .feature { | |
| fill: #ccc; | |
| cursor: pointer; | |
| } | |
| .feature.active { | |
| fill: orange; | |
| } | |
| .mesh { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-linecap: round; | |
| stroke-linejoin: round; | |
| } | |
| </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, | |
| active = d3.select(null); | |
| var projection = d3.geo.albersUsa() | |
| .scale(1000) | |
| .translate([width / 2, height / 2]); | |
| var zoom = d3.behavior.zoom() | |
| .translate([0, 0]) | |
| .scale(1) | |
| .scaleExtent([1, 8]) | |
| .on("zoom", zoomed); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("click", stopped, true); | |
| svg.append("rect") | |
| .attr("class", "background") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("click", reset); | |
| var g = svg.append("g"); | |
| svg | |
| .call(zoom) // delete this line to disable free zooming | |
| .call(zoom.event); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
| if (error) throw error; | |
| g.selectAll("path") | |
| .data(topojson.feature(us, us.objects.states).features) | |
| .enter().append("path") | |
| .attr("d", path) | |
| .attr("class", "feature") | |
| .on("click", clicked); | |
| g.append("path") | |
| .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; })) | |
| .attr("class", "mesh") | |
| .attr("d", path); | |
| }); | |
| function clicked(d) { | |
| if (active.node() === this) return reset(); | |
| active.classed("active", false); | |
| active = d3.select(this).classed("active", true); | |
| var bounds = path.bounds(d), | |
| dx = bounds[1][0] - bounds[0][0], | |
| dy = bounds[1][1] - bounds[0][1], | |
| x = (bounds[0][0] + bounds[1][0]) / 2, | |
| y = (bounds[0][1] + bounds[1][1]) / 2, | |
| scale = Math.max(1, Math.min(8, 0.9 / Math.max(dx / width, dy / height))), | |
| translate = [width / 2 - scale * x, height / 2 - scale * y]; | |
| svg.transition() | |
| .duration(750) | |
| .call(zoom.translate(translate).scale(scale).event); | |
| } | |
| function reset() { | |
| active.classed("active", false); | |
| active = d3.select(null); | |
| svg.transition() | |
| .duration(750) | |
| .call(zoom.translate([0, 0]).scale(1).event); | |
| } | |
| function zoomed() { | |
| g.style("stroke-width", 1.5 / d3.event.scale + "px"); | |
| g.attr("transform", "translate(" + d3.event.translate + ")scale(" + d3.event.scale + ")"); | |
| } | |
| // If the drag behavior prevents the default click, | |
| // also stop propagation so we don’t click-to-zoom. | |
| function stopped() { | |
| if (d3.event.defaultPrevented) d3.event.stopPropagation(); | |
| } | |
| </script> |
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@bhrutledge / @mbostock - I've gone ahead and made a working fork to using d3 v4 here instead of the v3 example. https://bl.ocks.org/iamkevinv/0a24e9126cd2fa6b283c6f2d774b69a2
I'm still new to this, so i don't claim to definitively know this to be perfect, but it appears to be 100% ported over. Revisions can be reviewed here: https://gist.github.com/iamkevinv/0a24e9126cd2fa6b283c6f2d774b69a2/revisions