Map Zooming

Map Zooming II

Moving the mouse across the map smoothly interpolates a zoom between San Francisco and New York. The visualization renders United States state boundaries as a canvas-drawn mesh using d3.geo.path with a custom projection that applies dynamic simplification and clipping during the zoom. It uses d3.interpolateZoom, d3.geo.transform, and d3.geo.clipExtent to control the transition, adjusting the scale and translate values based on the pointer's horizontal position. The underlying TopoJSON data is pre-simplified with topojson.presimplify, and the rendering occurs entirely through the Canvas 2D API.

90% match

Map Zooming III

A map of the United States is drawn with canvas, and moving the mouse horizontally smoothly interpolates between three zoom levels centered on San Francisco, New Orleans, and New York. The example uses a linear scale with `d3.interpolateZoom` to map mouse position to a zooming transform, and `d3.geo.transform` for simplification. It renders TopoJSON state boundaries clipped by `d3.geo.clipExtent`, using D3 v3’s `d3.geo.path` with a canvas context.

90% match

OPHZ Zooming

A map of U.S. counties continuously zooms between a national overview and a detailed close-up of San Francisco. The sequence repeats automatically, using D3’s `d3.behavior.zoom` and `d3.geo.clipExtent` for viewport clipping. TopoJSON geometry is pre-simplified and dynamically simplified with `d3.geo.transform` based on zoom scale, then rendered as stroked paths on Canvas.

84% match

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`.

84% match

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.

Gist 6414125

This example demonstrates interactive panning and zooming over a map of U.S. states and counties using SVG. It uses `d3.behavior.zoom` to control the map’s transform, while `d3.geo.path` renders the TopoJSON data from the `us.json` file. The zoom event updates the map’s translate and scale attributes, and stroke widths adjust inversely to the zoom level. Buttons also allow resetting the view or disabling the zoom event entirely.

11wheel

click-to-zoom via transform

Clicking a US state zooms to that state via a SVG transform transition, while clicking the background resets the view. The map renders TopoJSON data through `d3.geo.albersUsa` projection and `d3.geo.path`, with state borders drawn from a topology mesh. An orange highlight marks the active state, and stroke width inversely scales with zoom. The interaction uses a `g.transition()` to animate `translate` and `scale` attributes over 750 milliseconds.

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