Z-order

This article is about the graphical user interface concept. For the space-filling curve, see Z-order curve.

Z-order is an ordering of overlapping two-dimensional objects, such as windows in a stacking window manager, shapes in a vector graphics editor, or objects in a 3D application.[1] One of the features of a typical GUI is that windows may overlap, so that one window hides part or all of another. When two windows overlap, their Z-order determines which one appears on top of the other.

  1. ^ Foley, James, Andries van Dam, Steven Feiner, and John Hughes (1987). Computer Graphics: Principles and Practice. Reading, Massachusetts: Addison-Wesley Publishing Company. pp. 870-871.