popmotion/lib/utils/snap.js

The animator's toolbox

export var snap = function (points) {
    if (typeof points === 'number') {
        return function (v) { return Math.round(v / points) * points; };
    }
    else {
        var i_1 = 0;
        var numPoints_1 = points.length;
        return function (v) {
            var lastDistance = Math.abs(points[0] - v);
            for (i_1 = 1; i_1 < numPoints_1; i_1++) {
                var point = points[i_1];
                var distance = Math.abs(point - v);
                if (distance === 0)
                    return point;
                if (distance > lastDistance)
                    return points[i_1 - 1];
                if (i_1 === numPoints_1 - 1)
                    return point;
                lastDistance = distance;
            }
        };
    }
};
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