Basics of ZPL

Region Operators

ZPL has region operators taking as operands a region and a direction, and producing a region

•at translates the region’s index set in the direction

•of defines a new region adjacent to the given region along direction edge and of direction extent

region R = [1..8,1..8];

C = [2..7,2..7];

var X, Y : [R] byte;

Direction e = [ 0,1];

n = [-1,0];

ne = [-1,1];

[C] X:=

[C at e] Y:=

[n of C] Y:=

[C] Y:=X@ne