Let l be a fixed line of the plane and AB a given directed segment on l. By the glide-reflection  we mean the product  where  is the reflection with respect to the line l, and  is the translation with respect to the directed segment AB. The line l is called the axis of the glide-reflection, and the directed segment AB on l is called the vector of the glide-reflection.

For a detailed description of Q (the object created), use the routine detail (i.e., detail(Q))

The command with(geometry,GlideReflection) allows the use of the abbreviated form of this command.

assume that the names of the horizontal and vertical axes are _x and _y, respectively