how to detect minimum rotation in a JavaScript gesture library (eg alloyfinger.js)

_x000D_ _x000D_ I have a mobile web app written in JavaScript, using alloyfinger.js. I tried Hammer.js, but it didn't work with certain iPhone models (eg iPhone 7+). I suspect my question is the same for various gesture detection libraries. My app detects rotate events, but I can't seem to write the correct code to ignore rotate events below a minimum angle of rotation. The code below hides the rotated element, even when the amount of rotation is very small. handleRotatEvent(evt) { const angle = evt.angle; const absAngle = Math.abs(angle); const minAngle = (90 * Math.PI / 180); // convert 90 degrees to radians if (absAngle < minAngle) return; hideItem(evt); // use the event to find the target DOM element and hide it } My intent is to ignore rotations smaller than 90 degrees. Otherwise, hide the rotated element. What am I misunderstanding or doing wrong here? Thanks! Adam Leffert https://www.leffert.com