akima-interpolator
v1.0.0
Published
Akima spline interpolator
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Readme
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
.
- Copyright 2019 Marc Juul [email protected]
- Copyright 2017-2019 Christian d'Heureuse [email protected]
- Copyright 2001-2019 The Apache Software Foundation