This TypeScript widget can be used to define a function graph by moving interpolation knots with the mouse or touch screen.
The type of interpolation used depends on the number of knots:
Source code: github.com/chdh/function-curve-editor
NPM package: function-curve-editor
Author: Christian d'Heureuse (www.source-code.biz, www.inventec.ch/chdh)
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