block by mbostock 3916621

Path Tween

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This example demonstrates path interpolation using SVG’s getPointAtLength feature. The source path and the target path are sampled uniformly using a configurable precision in pixels (here, 4px). During the transition, the path is replaced with a piecewise linear curve, or polyline, for easier interpolation. When the transition finishes, the path is restored to the original cubic Bézier. This technique is handy because it works for any path expressible with SVG’s path data mini-language.

See also the circular shape tweening example.