escalator-web/src/utils.js

function isInBox(pos, box) {
    return (
        (pos.x > box.x && pos.x < box.x + box.width) &&
        (pos.y > box.y && pos.y < box.y + box.height));
}

function position(event) {
    return {
        x: event.clientX,
        y: event.clientY,
    };
}