DistanceSquared = function (x1, y1, x2, y2)
{
    var dx = x1 - x2;
    var dy = y1 - y2;

    return dx * dx + dy * dy;
}
Calculate the distance between two sets of coordinates (points), squared.

@function Phaser.Math.Distance.Squared
@since 3.0.0

@param {number} x1 - The x coordinate of the first point.
@param {number} y1 - The y coordinate of the first point.
@param {number} x2 - The x coordinate of the second point.
@param {number} y2 - The y coordinate of the second point.

@return {number} The distance between each point, squared.