DCL:GRPH2:UWPACK: Grid-Point Information Handling Routines
The UWPACK is a subroutine package for handling information on 2-D grip-point coordinates.
UWPACK contains the following subroutines and functions. (In the following
routines, those with 'x' as the 5th character in their name are routines for the
X axis, and those with 'y' are for the Y axis.)
These are used in the UDPACK (Section 8), UEPACK
(Section 9), and UGPACK (Section10),
and share information concerning the grid points. For example, when you wish to draw
contours (UDPACK) and perform tone fill (UEPACK) on an array with the same grid
structure, you will only need to specify the information concerning the grid
points once at the start with UWPACK, and the UDPACK and UEPACK will use this
information to draw.
Internally, the grid- point information is handled in a COMMON block named UWBLKX
and UWBLKY. The user must not use an external procedure or a COMMON
block with the same name.