subsec.csh

> From: (Glenn Fernandez) [email removed]

> This is a really intersting "little ditty", but Iam at a little lost
> on it is to be used. Has anyone used it yet? And if so can you explain how?

I've used it! What it does is extract a single subsector's world data
from a whole sector's worth of world data.

As all Traveller veterans are well familar, a sector is an array of 32 X
40 hexes, and is subdivided into sixteen 8 X 10-hex subsectors as
follows (I hope my A-R, omitting I and O lettering was correct --
somebody correct me should my memory be faulty):

		      X COORDINATE

        01 .. 08 | 09 .. 16 | 17 .. 24 | 25 .. 32
        _________|__________|__________|_________
       |         |          |          |         |
    01 |         |          |          |         |
 Y  .. |    A    |    B     |    C     |    D    |
    10 |         |          |          |         |
 C  ___|_________|__________|__________|_________|
 O     |         |          |          |         |
 O  11 |         |          |          |         |
 R  .. |    E    |    F     |    G     |    H    |
 D  20 |         |          |          |         |
 I  ___|_________|__________|__________|_________|
 N     |         |          |          |         |
 A  21 |         |          |          |         |
 T  .. |    J    |    K     |    L     |    M    |
 E  30 |         |          |          |         |
    ___|_________|__________|__________|_________|
       |         |          |          |         |
    31 |         |          |          |         |
    .. |    N    |    P     |    Q     |    R    |
    40 |         |          |          |         |
       |_________|__________|__________|_________|


The official form of storing mass amounts of world data (as declared by
Traveller prime originator Mark Miller) is in a file representing an
entire sector, with each line of the file representing a single world.
The gensec program I wrote produces a format very similar to Mr.
Miller's format (it has a few added columns).

Sometimes it is nice to extract the data for a single subsector, for
example to create a detailed subsector map (ala mapsub, the subsector
mapping program, for instance).  What is desired is a program that given
a sector file, produces a subsector file by throwing out all the worlds
not belonging to a single sector of interest.  A shell script has been
written to do this, called subsec.csh.

Given a sector file, "Spinward", and a desire to look at subsector "G"
only, one could type to the UNIX Shell:

	subsec.csh 3 2 Spinward >Regina

This would create a new file, "Regina" which contains only those worlds
from Spinward which are also in the G subsector region.  The 3, 2 is the
x, y coordinates of the "G" subsector in the overall sector picture
above (The origin is at the upper right corner of the subsector map).

Now what to do with the subsector data? Well, you can show the data to
your players, or map it into a pretty hex grid with the mapsub program.

Naturally to use subsec.csh, you need to be running UNIX and have the
csh command shell.

I don't mean to offend if this is a simpler explanation than was
desired.  I know there are some people out there not very familiar with
Traveller and I hoped to write something at a novice level to help them
out.

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James T. Perkins		Traveller Mailing List Administrator
Tektronix Logic Analyzers	"Load Auto/Evade, Beowulf!"
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