Zoom to Feature

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

Basic Map Zooming

This example demonstrates how d3-zoom can be used to add pan and zoom interactions to a map. The map shows the states of India, rendered as SVG paths using an azimuthal equal-area projection and TopoJSON data. Each state is filled with a distinct color from a categorical palette, and hovering highlights the state by raising it above its neighbors and applying a thicker stroke. The zoom behavior, constrained to a scale range of 1–8× and bounded by the viewport, is applied directly to the SVG element, with a transform on the group containing all map paths. The window resize handler recalculates the projection’s fit and updates the translate extent, demonstrating how d3-zoom integrates with dynamic map projections.

663anp3ca

MB zoom circles in and out

This example demonstrates a zoomable map interface where clicking a circle smoothly scales and pans the view to center on that circle, with a reset option to return to the initial state. It uses D3 v4 with SVG rendering and animation, relying on `d3.zoom` and `d3.zoomIdentity` for transform handling and `transition.call(zoom.transform)` for the animated effect. The data is a static array of circle objects with coordinates, radius, and colors, while a topojson feature layer provides the underlying map context. The background rectangle enables click-to-reset functionality, and strokes adjust dynamically based on zoom scale.

react first level drilldown map using zoom

This example shows a first-level drilldown map of India that zooms into the selected state or district. Clicking a polygon triggers a smooth zoom animation that fits the clicked region’s bounding box, computed with `d3.geoPath().bounds`, before updating the rendered features. The map uses React state to toggle between state-level and district-level TopoJSON data, loaded via `d3.json`, while `d3.zoom` handles pan and scale transforms on the SVG. The `geoMercator` projection and `geoPath` render the geographic boundaries in a teal fill.

AAnimesh Nautiyal

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.

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Zoom to Bounding Box II d3v4

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Zoom to Bounding Box II d3v4-Identity

This example demonstrates how to zoom to a bounding box of a selected geographic feature using D3 v4’s zoom behavior and transitions. The map displays U.S. counties in California, rendered as SVG paths from a TopoJSON file. Clicking on a county triggers a smooth zoom transition that centers and scales the view to fit the county’s bounding box, while also allowing users to freely pan and zoom with mouse or touch interactions. The animation between views is handled by D3’s zoom transition, which interpolates the transform values for a fluid, intuitive user experience.

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