Pan & Zoom IV

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Last edited Aug 12, 2019

Created on May 26, 2016

Two thousand circles laid out in a phyllotaxis spiral show the d3.zoom behavior applied by directly manipulating each circle’s SVG transform attribute. On every zoom event, the code calls *transform*.applyX and *transform*.applyY to remap the original data coordinates, keeping all circle radii constant at 2.5 pixels while allowing pan and zoom between half and four times the initial scale. This approach, written in d3.v4 with SVG, demonstrates an alternative to scaling a single parent group, trading performance for customization.

AI-generated description

This examples demonstrates using transform.applyX and transform.applyY to apply the zoom behavior’s transform to data, rather than using an SVG transform. This is typically slower because it requires modifying all two thousand elements on each zoom, but it lets you customize the display on zoom, such as rendering circles that are the same size regardless of scale; consider using Canvas.

gpl-3.0 Licensed

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