This is a javascript library for Akima spline interpolation.

Given a set of points in 2D space this library will interpolate a spline (curved line) which often seems more natural than the result from the more common natural cubic spline interpolation.

This is a port of Java code from the Apache Commons Math library, with a bit of code borrowed from the commons-math-interpolation TypeScript port.

Usage

``import Akima from 'akima-interpolator'; var akima = new Akima();

var xvals = [ 10, 20, 30, 40, 50, 60, 70, 80 ];

var yvals = [ 40, 10, 17, 39, 99, 120, 30, 10 ]; var f = akima.createInterpolator(xvals, yvals);

for(var i=xvals[0]; i < xvals[xvals.length-1]; i++) { console.log('x:', i, 'y:', f(i)); }`

`Visual example`

Christian d'Heureuse has a nice visual demo of his TypeScript port comparing different interpolations here.

Try to put two points very close to each-other on the x-axis but with differing y-axis values, then put a third point far away on the x-axis but close to the second point on the y-axis. Switch between Natural and Akima to see the difference.

`License and copyright`

This project is licensed under the AGPLv3 license. A copy of the AGPLv3 license is included in the file LICENSE.txt.

This product includes software developed at The Apache Software Foundation (www.apache.org) which is licensed under the Apache 2 License. A copye of the Apache 2 License is included in the file LICENSE_APACHE.txt.

This project includes code ported from the MIT-licensed commons-math-interpolation library. A copy of the MIT License is included in the file LICENSE_MIT.md`.