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The arguments are the origin and extent of the world window,
expressed in world units.
They define the range of values
to be returned by the map$int and map$fp routines.
parameters set by map$setup are
2.2.2.3
map$port.
Default
(0.0, 0.0, 511.0, 511.0);
This procedure and associated variables
are declared and used as follows:
declare
map$port
entry (fix(15),
fix(15)),
fix(15),
fix(15),
fix(15),
fix(15);
fix(15),
fix(15),
x origin
y-origin
x extent
y extent
call map$port
(xorigin, y_origin, xextent, y_extent);
The arguments are the origin and extent of the frame buffer
port. Values
for the origin may range from 0 to 511.
Origin + extent should not exceed 511 in either direction.
At zoom scale
1, the frame buffer and screen image are
identical. The arguments define the range of values to be
returned by the map$int and map$fp routines.
parameters set by map$setup are
(0, 0, 511,
Default
511).