GetNormal = function (line, out)
{
    if (out === undefined) { out = new Point(); }

    var a = Angle(line) - MATH_CONST.TAU;

    out.x = Math.cos(a);
    out.y = Math.sin(a);

    return out;
}
Calculate the normal of the given line.

The normal of a line is a vector that points perpendicular from it.

@function Phaser.Geom.Line.GetNormal
@since 3.0.0

@generic {Phaser.Geom.Point} O - [out,$return]

@param {Phaser.Geom.Line} line - The line to calculate the normal of.
@param {(Phaser.Geom.Point|object)} [out] - An optional point object to store the normal in.

@return {(Phaser.Geom.Point|object)} The normal of the Line.