LineToLine = function (line1, line2, out) {
    if (out === undefined) { out = new Point(); }

    var x1 = line1.x1;
    var y1 = line1.y1;
    var x2 = line1.x2;
    var y2 = line1.y2;

    var x3 = line2.x1;
    var y3 = line2.y1;
    var x4 = line2.x2;
    var y4 = line2.y2;

    var numA = (x4 - x3) * (y1 - y3) - (y4 - y3) * (x1 - x3);
    var numB = (x2 - x1) * (y1 - y3) - (y2 - y1) * (x1 - x3);
    var deNom = (y4 - y3) * (x2 - x1) - (x4 - x3) * (y2 - y1);

    //  Make sure there is not a division by zero - this also indicates that the lines are parallel.
    //  If numA and numB were both equal to zero the lines would be on top of each other (coincidental).
    //  This check is not done because it is not necessary for this implementation (the parallel check accounts for this).

    if (deNom === 0) {
        return false;
    }

    //  Calculate the intermediate fractional point that the lines potentially intersect.

    var uA = numA / deNom;
    var uB = numB / deNom;

    //  The fractional point will be between 0 and 1 inclusive if the lines intersect.
    //  If the fractional calculation is larger than 1 or smaller than 0 the lines would need to be longer to intersect.

    if (uA >= 0 && uA <= 1 && uB >= 0 && uB <= 1) {
        out.x = x1 + (uA * (x2 - x1));
        out.y = y1 + (uA * (y2 - y1));

        return true;
    }

    return false;
}
Checks if two Lines intersect. If the Lines are identical, they will be treated as parallel and thus non-intersecting.

@function Phaser.Geom.Intersects.LineToLine
@since 3.0.0

@param {Phaser.Geom.Line} line1 - The first Line to check.
@param {Phaser.Geom.Line} line2 - The second Line to check.
@param {Phaser.Geom.Point} [out] - A Point in which to optionally store the point of intersection.

@return {boolean} `true` if the two Lines intersect, and the `out` object will be populated, if given. Otherwise, `false`.