Point-Along-Path Interpolation

Point-Along-Path Interpolation

A single point traverses a pair of Catmull–Rom splines, using the SVG `getTotalLength` and `getPointAtLength` methods to compute the point’s position along the path at each frame. The example also includes interactive behavior: clicking on the canvas creates new circles that move along the path with simple vector-based steering toward the mouse position. The visualization demonstrates how path interpolation can be combined with animated movement in D3.

92% match

Point-Along-Path Interpolation

Two square Catmull–Rom spline paths are drawn in black, and clicking the SVG spawns colored circles that animate along the paths. Each circle moves along one path for the first 30% of its journey, then switches to the other path for the remainder, while a text label displays the animation progress. The example uses D3 v3 with SVG transitions and `transition.attrTween` to interpolate positions via the native `getTotalLength` and `getPointAtLength` methods on path elements.

Point-Along-Path Interpolation

This visualization demonstrates how to interpolate a point along an SVG path using the native `getTotalLength` and `getPointAtLength` methods. Two rectangular Catmull–Rom splines are rendered, with circles animated along each path using custom Vector and Runner classes that apply acceleration, velocity, and edge-bouncing behavior. The animation shows two points moving along the paths, with their motion influenced by simple physics (forces and mass) while remaining constrained to the path geometry. The example is built with D3 v3 and renders using SVG, with the circles styled with white strokes to stand out against the black paths.

Point-Along-Path Interpolation

Two closed Catmull–Rom splines are drawn as black outlines. Clicking anywhere on the SVG adds a colored circle that then animates along one of the two paths, using the SVG path methods `getTotalLength` and `getPointAtLength` to interpolate its position. A running counter in the top right displays the animation progress as a percentage, and each new click adds another circle with a randomly assigned color, creating multiple points moving simultaneously along the paths.

Point-Along-Path Interpolation

Two closed Catmull–Rom spline paths appear as black outlines on a white SVG canvas. Clicking anywhere on the canvas spawns a colored circle that animates along the path, moving at a constant speed. This is achieved by leveraging the SVG path methods `getTotalLength()` and `getPointAtLength()` to compute the circle’s position at each animation frame. The motion loops continuously, with each circle retaining its own velocity, acceleration, and top-speed properties, producing an organic, independent movement around the spline.

Point-Along-Path Interpolation

Two nested, closed Catmull–Rom splines define the paths in this SVG animation. Clicking anywhere adds a colored circle that first collapses to the inner path’s start, then follows the outer path via a tween that switches between the two paths partway through the animation. The code uses D3 v3’s `transition.attrTween` with the native SVG `getTotalLength` and `getPointAtLength` methods to interpolate each circle’s position, while a text element displays the tween progress as a percentage.

Point-Along-Path Interpolation

This example uses SVG’s `getTotalLength` and `getPointAtLength` methods to animate a point along a Catmull–Rom spline. Two rectangular paths are drawn as black outlines, and a small white-stroked circle follows the second path, moving from corner to corner. The animation is driven by a custom Runner class that applies acceleration and velocity to the point, while the path’s geometry is sampled at successive lengths to position the circle. A small text label and the dark outlines keep the composition minimal. The technique demonstrates dynamic interpolation along a path, in contrast to static stroke-dash interpolation, and is implemented with D3 v3 and SVG animation.

90% match

Point-Along-Path Interpolation

Two nested rectangular paths drawn as Catmull–Rom splines are animated with circular markers that travel along them using the SVG `getTotalLength` and `getPointAtLength` methods. The example defines a custom `Runner` class with vector-based steering behaviors (seek, arrive, and edge wrapping) to move the circles around the closed paths, while D3's line interpolation renders the paths. An on-screen text label and the animated circles demonstrate the interpolation of positions along the splines in real time.