Drag & Zoom II

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Drag & Zoom II

✓ Published0🌍 Public

Last edited Aug 8, 2019

Created on May 31, 2016

This example demonstrates a zoomable SVG canvas containing two thousand circles arranged in a phyllotaxis pattern, where users can click and drag on the background to pan the view or drag individual circles to reposition them. The visualization combines d3-drag and d3-zoom, using the `d3.zoomIdentity` transform to update the group’s `transform` attribute during zooming, while the drag handler updates each circle’s `cx` and `cy` attributes directly. Rendering relies on SVG’s built-in hit-testing and coordinate transformation, avoiding the need for manual redraws or complex event logic.

AI-generated description

This example shows how to combine d3-drag and d3-zoom to allow dragging of individual circles within a zoomable SVG. If you click and drag on the background, the view pans; if you click and drag on a circle, it moves.

This is quite a bit simpler than implementing drag-and-zoom with Canvas, since the SVG element automatically provides hit-testing, coordinate system transformation and re-rendering.

gpl-3.0 Licensed

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