Offset = function (triangle, x, y)
{
    triangle.x1 += x;
    triangle.y1 += y;

    triangle.x2 += x;
    triangle.y2 += y;

    triangle.x3 += x;
    triangle.y3 += y;

    return triangle;
}
Moves each point (vertex) of a Triangle by a given offset, thus moving the entire Triangle by that offset.

@function Phaser.Geom.Triangle.Offset
@since 3.0.0

@generic {Phaser.Geom.Triangle} O - [triangle,$return]

@param {Phaser.Geom.Triangle} triangle - The Triangle to move.
@param {number} x - The horizontal offset (distance) by which to move each point. Can be positive or negative.
@param {number} y - The vertical offset (distance) by which to move each point. Can be positive or negative.

@return {Phaser.Geom.Triangle} The modified Triangle.