While not a literal class in Lua, GraphicEntity is a variant referring to any of the types listed on this page. These types serve to describe the possible special entities that may be attached to the grid.
A simple black-to-transparent gradient placed somewhere on the grid.
Returns a description of a blackout which covers the given region and, if specified, where the gradient fades towards the given direction or which is a solid black region if no fade is specified or if the fade is specified as NEUTRAL.
Returns a description of a mirror which displays the contents of the rectangle source transposed to the rectangle target. Note that only target.lesser affects the result; no scaling takes place and the size of the target rectangle is ignored.