Length = function (line)
{
    return Math.sqrt((line.x2 - line.x1) * (line.x2 - line.x1) + (line.y2 - line.y1) * (line.y2 - line.y1));
}
Calculate the length of the given line.

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

@param {Phaser.Geom.Line} line - The line to calculate the length of.

@return {number} The length of the line.