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gml_GlobalScript_ease_inout_elastic

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function ease_inout_elastic(arg0, arg1, arg2, arg3)
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{
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    var _s = 1.70158;
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    var _p = 0;
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    var _a = arg2;
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    if (arg0 == 0 || _a == 0)
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        return arg1;
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    arg0 /= (arg3 * 0.5);
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    if (arg0 == 2)
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        return arg1 + arg2;
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    if (!_p)
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        _p = arg3 * 0.44999999999999996;
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    if (_a < abs(arg2))
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    {
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        _a = arg2;
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        _s = _p * 0.25;
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    }
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    else
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    {
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        _s = (_p / (2 * pi)) * arcsin(arg2 / _a);
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    }
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    if (arg0 < 1)
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        return (-0.5 * (_a * power(2, 10 * --arg0) * sin((((arg0 * arg3) - _s) * (2 * pi)) / _p))) + arg1;
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    return (_a * power(2, -10 * --arg0) * sin((((arg0 * arg3) - _s) * (2 * pi)) / _p) * 0.5) + arg2 + arg1;
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}