This repository has been archived by the owner on Sep 8, 2020. It is now read-only.
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It turned out that mouseMoveHandler was not correctly handling mouse positions of 0, treating it as falsy and falling back on other event properties. The fall-through case was also unhandled, resulting in an undefined exception.
Added new getMousePosition function to the controller so it could be individually unit tested and updated it to check for existence of mousePosition properties. If getMousePosition fails to find a valid position on the event it will return null and mouseMoveHandler will not requestAnimationFrame.