Zoom to Bounding Box

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Zoom to Bounding Box

✓ Published0🌍 Public

Last edited Apr 12, 2017

Created on Apr 12, 2017

This interactive map of the United States uses D3.js (v3) with the Albers USA projection to render state boundaries as SVG paths. Clicking a state triggers a smooth 750-millisecond transition that computes the clicked feature's bounding box and applies a translate and scale transform to zoom into it. The zoom level and translation are calculated using the `d3.geo.path` bounds method, with stroke widths adjusted inversely to the scale. Clicking the active state or the background resets the viewport to its original full-country extent.

AI-generated description

This example demonstrates how to compute a suitable translate and scale to zoom to the bounding box of a particular feature. Click on any state to zoom in; click on the focused state or the background to zoom out.

This variant uses transform transitions to change the viewport. A slightly better approach, and one that can also allow free panning and zooming with the mouse if desired, is to use zoom transitions.

forked from <a href='http://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='http://bl.ocks.org/mbostock/4699541'>Zoom to Bounding Box</a>

gpl-3.0 Licensed

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