Based on https://github.com/mourner/simplify-js, geosimplify-js fixes the problem that the simple pythagorean measure used in simplify-js changes size if you simply give it longitude/latitude sequences to simplify.
Used in the QML plugin of Qt Location.
The sources can be found in tqtc-qt5/qtlocation/src/3rdparty/geosimplify.js.
Copyright (c) 2017 Daniel Patterson
Qt port of geosimplify.js, https://github.com/mapbox/geosimplify-js
Copyright (c) 2017, Daniel Patterson
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Based on simplify-js by Vladimir Agafonkin - http://mourner.github.io/simplify-js/