A zero-dependency D3 plugin for smoothly interpolating SVG path animations when paths have different numbers of points.
d3-interpolate-path is a JavaScript library that provides smooth interpolation for SVG path animations, specifically when the start and end paths have different numbers of points. It extends paths to match point counts and applies linear interpolation, enabling fluid transitions in data visualizations. The library can also work with path command objects for use with canvas or WebGL.
Developers building animated data visualizations with D3.js who need to smoothly transition between SVG paths with varying structures, such as line charts, area charts, or complex shapes.
It solves a common pain point in SVG animation by handling path point mismatches seamlessly, offers zero dependencies for lightweight integration, and provides flexibility for both SVG and other rendering contexts like canvas or WebGL.
Interpolates path d attribute smoothly when A and B have different number of points.
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Lightweight and self-contained, making integration straightforward without adding library bloat, as emphasized in the README's zero-dependency claim.
Intelligently extends paths to match point counts before interpolation, solving a common pain point in SVG animations for smooth transitions even with differing structures.
Supports both SVG path strings and command object arrays via interpolatePathCommands, enabling use with canvas, WebGL, or other rendering contexts as shown in the API.
Uses De Casteljau's algorithm for bezier curves, ensuring high-quality animations for complex paths without visual artifacts.
Focused solely on path interpolation, lacking features for general animation like easing functions or keyframe management, requiring supplemental libraries for full animation workflows.
Despite being dependency-free, it adds itself to the d3 namespace, which can cause integration issues or confusion in projects not heavily using D3.js, as noted in the README.
Requires understanding of SVG path command objects and the excludeSegment function for advanced use, which may be challenging for developers unfamiliar with SVG internals.