CubicSplineSwift

An implementation of an constrained cubic spline that should eliminate over and undershoot when handling charts while maintaining a smooth curve.

Installation

You can use CubicSplineSwift through SPM.

Example Data

The data was normalized to values between 0 and 1 before creating the spline.

Usage

Initialize the ConstrainedCubicSpline with a list of at least 3 Points. Alternatively use lists with x and y coordinates which need to be the same length and have at least 3 values each. Then you can call createSpline which will return an array of points that span the data from start to finish. This will result in x values from 0.00, 0.01 to 0.99, 1.00 if 101 values would be requested.

Source

calculation source: https://pages.uoregon.edu/dgavin/software/spline.pdf

License

CubicSplineSwift is available under MIT License.