Dynamic Simplification IV zoom to bounding box

100%

Dynamic Simplification IV zoom to bounding box

✓ Published0🌍 Public

Last edited Mar 17, 2017

Created on Mar 17, 2017

This map of U.S. states dynamically simplifies geometry during zooming so that visible detail stays near one square pixel, using D3 v4 and topojson-simplify. Clicking any state highlights it and triggers a smooth zoom to its bounding box via `d3.zoom` and `d3.geoPath`. A hidden canvas with `getImageData` identifies the selected feature by color, while borders and fills render on a visible Canvas with animation.

AI-generated description

This map dynamically simplifies the geometry in response to zooming, so that the smallest displayed detail is approximately one square pixel. Use the mousewheel, or pinch on touch devices, to zoom.

There is a click handler that highlight a specific feature. Once you get the feature, you can zoom to the bounding box!

Started from <a href='https://bl.ocks.org/mbostock/'>mbostock</a>'s block: <a href='https://bl.ocks.org/mbostock/7755778'>Dynamic Simplification IV</a>

Thanks to <a href='https://bl.ocks.org/fil/'>Fil</a>'s work:

<a href="https://bl.ocks.org/Fil/652458d1831e41de6efe1d453152131b">Zoom to Bounding Box II d3v4</a>
<a href="http://blockbuilder.org/Fil/a8cfbbfd0100d38241beb48d23c9d4d1">Dynamic Simplification IV zoom to centroid</a>

forked from <a href='http://bl.ocks.org/Lacroute/579bc326fb547110a959c0a9ac2b30ce'>Dynamic Simplification IV with canvas selection</a>

forked from <a href='http://bl.ocks.org/Lacroute/'>Lacroute</a>'s block: <a href='http://bl.ocks.org/Lacroute/af1b46da4cb4579f93986b0119635ec2'>Dynamic Simplification IV zoom to bounding box</a>

forked from <a href='http://bl.ocks.org/anonymous/'>anonymous</a>'s block: <a href='http://bl.ocks.org/anonymous/d02ee2393bc6544267fbcafa6733b789'>Dynamic Simplification IV zoom to bounding box</a>

gpl-3.0 Licensed

Similar vizzes

Loading thumbnail…

Dynamic Simplification IV

This map of U.S. states shows dynamically simplified geometry that adjusts its level of detail based on zoom, keeping the smallest visible feature roughly one pixel in size. The example uses TopoJSON data with `topojson.presimplify` and a custom `d3.geoTransform` filter based on a minimum area threshold, applied through `d3.geoPath` with Canvas rendering. Zooming is handled by `d3.zoom`, which updates the simplification threshold and redraws filled land polygons and state borders on the canvas.

Mmbostock

91% match

Loading thumbnail…

Dynamic Simplification II

This example combines map zooming with dynamic simplification. As the map zooms in and out, the simplification area threshold adjusts based on the current scale, keeping the map visually clear and rendering quickly. Points outside the viewport are simplified much more heavily than those inside, approximating viewport clipping. The code uses `d3.geo.transform` to filter points, `d3.behavior.zoom` for interaction, and `d3.geo.path` with a Canvas context to draw the TopoJSON data (us-states.json), animating between zoom levels with `transition`.

Mmbostock

86% match

Loading thumbnail…

Zoom to bounding box d3.v4

Clicking a US state zooms the map to that state’s bounding box, with a smooth 750-millisecond transition, while the user can also freely pan and zoom. The example uses d3.v4’s `d3.zoom` and `d3.geoPath` with an Albers USA projection, rendering state features as SVG paths from TopoJSON. Zooming is triggered by computing the path bounds and applying `d3.zoomIdentity.translate().scale()` via `transition.call(zoom.transform)`. Clicking the background resets the view, and active states highlight in orange, with the mesh and stroke width updating on zoom.

FFrissAnalytics

85% match

Loading thumbnail…

Zoom to Bounding Box II d3v4

This example demonstrates zooming and panning across a map of the United States, with clickable states that smoothly transition to fill the viewport. It shows how to combine geographic projections with D3’s zoom behavior for interactive exploration. The visualization uses `d3.geoAlbersUsa` for the projection, `d3.geoPath` to render TopoJSON state boundaries, and `d3.zoom` to handle free pan and zoom. Clicking a state triggers a 750ms transition via `zoom.transform`, calculating a bounding-box scale and translate to frame the feature. The active state is highlighted in red, while stroke widths adjust inversely to the zoom level for crisp rendering.

IIgathi

84% match

Loading thumbnail…

Zoom to Bounding Box II d3v4

IIgathi

84% match

Loading thumbnail…

Zoom to Bounding Box II - test

This example demonstrates a zoomable and pannable map of U.S. states, where clicking a state smoothly transitions the view to center and scale that state’s bounding box. It shows how to combine free-form zooming and panning with programmatic animated transitions. The visualization uses D3 v3 with the `d3.geo.albersUsa` projection, `d3.geo.path` for rendering GeoJSON features, and `d3.behavior.zoom` for user interaction. Clicking a state triggers a 750-millisecond zoom transition, while a background click resets the view. State boundaries are drawn as a TopoJSON mesh, and the map data comes from a TopoJSON file of U.S. states.

IIgathi

84% match

Loading thumbnail…

Zoom to Bounding Box II

This interactive map of the United States lets users click any state to zoom smoothly to its bounding box, while also supporting free pan and zoom via mouse or touch. The visualization uses D3.js v3 with an AlbersUSA projection and TopoJSON state boundaries, rendered as SVG paths. Clicking a state triggers a 750-millisecond zoom transition, adjusting the zoom behavior’s scale and translate to fit the selected feature, while the active state highlights in orange. The zoomed function updates the group’s transform and stroke width inversely with scale, and the background rectangle resets the view when clicked.

EEvertLagerberg

84% match

Loading thumbnail…

Zoom to Bounding Box II

This example demonstrates smooth zooming and panning over a map of the United States using Albers equal-area projection. Users click individual states, triggering a 750-millisecond animated transition to a bounding box around that state, while the map remains freely navigable via mouse drag and wheel zoom. The visualization uses `d3.geo.albersUsa` for projection, `d3.behavior.zoom` for interactive and animated transformations, and `d3.geo.path` to render state boundaries and a mesh overlay from the US TopoJSON data file. Active states highlight in orange, and stroke widths adjust dynamically during zoom.

Mmbostock

84% match