RandomXY = function (vector, scale)
{
    if (scale === undefined) { scale = 1; }

    var r = Math.random() * 2 * Math.PI;

    vector.x = Math.cos(r) * scale;
    vector.y = Math.sin(r) * scale;

    return vector;
}
Compute a random unit vector.

Computes random values for the given vector between -1 and 1 that can be used to represent a direction.

Optionally accepts a scale value to scale the resulting vector by.

@function Phaser.Math.RandomXY
@since 3.0.0

@param {Phaser.Math.Vector2} vector - The Vector to compute random values for.
@param {number} [scale=1] - The scale of the random values.

@return {Phaser.Math.Vector2} The given Vector.