src/js/pannellum.js
function onDocumentTouchEnd() {
    isUserInteracting = false;
    if (Date.now() - latestInteraction > 150) {
        speed.pitch = speed.yaw = 0;
    }
    onPointerDownPointerDist = -1;
    latestInteraction = Date.now();

    fireEvent('touchend', event);
}
function onDocumentTouchEnd() {
    isUserInteracting = false;
    if (Date.now() - latestInteraction > 150) {
        speed.pitch = speed.yaw = 0;
    }
    onPointerDownPointerDist = -1;
    latestInteraction = Date.now();

    fireEvent('touchend', event);
}
Event handler for end of touches. Stops panning and/or zooming.
@private