popmotion/lib/utils/attract.js

The animator's toolbox

var identity = function (v) { return v; };
export var createAttractor = function (alterDisplacement) {
    if (alterDisplacement === void 0) { alterDisplacement = identity; }
    return function (constant, origin, v) {
        var displacement = origin - v;
        var springModifiedDisplacement = -(0 - constant + 1) * (0 - alterDisplacement(Math.abs(displacement)));
        return displacement <= 0
            ? origin + springModifiedDisplacement
            : origin - springModifiedDisplacement;
    };
};
export var attract = createAttractor();
export var attractExpo = createAttractor(Math.sqrt);
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