\linethickness{dimension}
Declares the thickness of horizontal and vertical lines in a picture environment to be dimension, which must be a positive length. It does not affect the thickness of slanted lines and circles, or the quarter circles drawn by \oval to form the corners of an oval.
\linethickness{dimenze}
Urcuje tloustku svislych i vodorovnych car v obrazku. Argument dimenze musi byt kladny. Neovlivnuje tloustku sklonenych car a kruznic, ani casti kruznic pouzitych napriklad v prikazu \oval.