circle-arc-drag

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circle-arc-drag

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Last edited Aug 22, 2016

Created on Jun 28, 2016

This example demonstrates how a draggable arc can be reconstructed from three movable points, showing the relationship between a circle's geometry and its SVG path. The code uses D3 v3’s `d3.behavior.drag` to update point positions, then calculates the circumcircle and radius via trigonometric formulas, applying the large-arc and sweep flags to render the correct arc. The visualization starts with a pre-defined path parsed into three points using `getTotalLength` and `getPointAtLength`, and the SVG `path` element updates on each drag event. Circles and paths are styled with strokes and fills, with the background set to black.

AI-generated description

Working on circles for http://1wheel.github.io/swoopy-drag/

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