Rocket.shx - AutoCAD stacked fraction font with super- and subscripts, crossed
Zero, Delta, Omega, etc.

Details:

1. Fractions:  3 1/2" must be reformatted to 3[1\2]".  The "[" shrinks the
text height and moves the insertion point up by about half a line.  The "\"
moves the insertion point down below the original line and inserts a "/".
The "]" moves the insertion point back to the original level and sets the
height back to the original value.

This zipfile should also include the file Rocket.lsp.
Rocket.lsp takes a text string "Text etc 3 1/2 more text." and returns it in
the form that Rocket.shx likes - "Text etc. 3[1\2] more text."

2. Superscripts:  Since the "[" can be used to move characters above the body
of the text and shrink them one can write things like e=mc.  In order to
restore the original height and position without finding a "/" in the
finished text you have to use the character code %%6, as in "e=mc[2%%6".

3. Subscripts: this is the same process in reverse: use %%007 to lower and
shrink the text and "]" to raise and reinflate it.  There are no ascii
subscript characters so I can't demonstrate this, but the correct version of
H2O would be formatted as "H%%0072]O"

4. Mu: %%008 displays as the greek micron symbol.

5. Delta symbol: %%9 will place a small triangle in the text string.

6. Phi: this matches the one in the Greeks font and is inserted with %%11.

7. Omega: similarly, an omega is inserted with %%12.

8. A proper multiplication sign.  Rather that using a "X", which sits on the
text baseline, %%5 inserts a multiplication sign.

9. The zero character has been modified to include a diagonal bar to avoid
confusion with the capital "O".

10. The capital i has crossbars added to distinguish it from the lowercase L.

Summary,  [  raises and shrinks the text
          \  inserts a / and lowers the text
          ]  raises and enlarges it
          %%006 lowers and enlarges
          %%007 lowers and shrinks
          %%005 multiplication sign
          %%008 Mu
          %%009 Delta
          %%011 Phi
          %%012 Omega


Note: Generally the short form of the character number can be used, for
example %%5 can usually be written instead of %%005.  However, if the next
character is a numeral then AutoCAD may interpret it as part of the number:
%%54 is interpreted as a 6, if the intent was to display "x4" then %%0054
should be used.  A space after the number is unambiguous: "%%5 4" displays
"x 4" as intended.
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