Contains = function (circle, x, y)
{
    //  Check if x/y are within the bounds first
    if (circle.radius > 0 && x >= circle.left && x <= circle.right && y >= circle.top && y <= circle.bottom)
    {
        var dx = (circle.x - x) * (circle.x - x);
        var dy = (circle.y - y) * (circle.y - y);

        return (dx + dy) <= (circle.radius * circle.radius);
    }
    else
    {
        return false;
    }
}
Check to see if the Circle contains the given x / y coordinates.

@function Phaser.Geom.Circle.Contains
@since 3.0.0

@param {Phaser.Geom.Circle} circle - The Circle to check.
@param {number} x - The x coordinate to check within the circle.
@param {number} y - The y coordinate to check within the circle.

@return {boolean} True if the coordinates are within the circle, otherwise false.