Party Register


    Author:   Skyle - clarkj@oit.edu
    Used in:  The Return - not released
    Updated:  30 October 1998, version 1.01

    Use:  A way to have the party composition be reflected in SDF values.  Thus
what monsters do in encounters, town/dungeons, or rooms in town/dungeons can be
based on party composition.  For example, a Slith town may be hostile to a party
with 2 or fewer Sliths, a human trainer may be eliminated if a party of 2 or
fewer humans enter town (thus no training), a Nephilim altar may curse a mostly
human party, etc.

    Setup:  SDFs 0:1, 0:2 for the party count (at entry and exit runes), 0:3 for
number of Humans, 0:4 for Nephil, 0:5 for Sliths, and 0:6 is a temporary count
(so one step per race rune).  X,Y is the space just outside of the entry rune.
Place the runes and a friendly version of a Townsman, Nephil, and Slith within
a room so the party members have to pass over the entry rune then a race rune
then the exit rune.

    Sequence 1 - entry rune:
      1  Town Block - 1A= 1 no enter
         Stuff Done Compare? - 0:1, 1A= 0, 1B= 2, if 2nd flag is lower goto 4, else jump to 3
      3  Stuff Done Compare? - 0:2, 1A= 0, 1B= 1, if 2nd flag is lower goto 4, else jump to 5
      4    Can't Enter - (msg below), 1A= 1 no enter, -1
           One at a time, step only once on a race rune
      5  Increment Flag - 0:1, 1A= 1, 1B= 0 increase
         Stuff Done Equal? - 0:2, is value 1A= 0 goto 7, else jump to 8
      7    Display Message - instructions, jump to 9
             Tells which rune a member should step on
      8    Display Small Message - instructions, jump to 9
             Smaller version of rune message
      9  Swap Terrain - 1A= X, 1B= Y, 2A= floor, 2B= wall/window/portcullis, -1

    Sequence 2 (on the 3 runes near the friendly monsters):
      Townsman  Increment Flag - 0:3, 1A= 1, 1B= 0 increase, jump to 2

      Nephil    Increment Flag - 0:4, 1A= 1, 1B= 0 increase, jump to 2

      Slith     Increment Flag - 0:5, 1A= 1, 1B= 0 increase, jump to 2

      2  Increment Flag - 0:6, 1A= 1, 1B= 0 increase
         Stuff Done Compare? - 0:6, 1A= 0, 1B= 1, if 2nd flag is lower goto 4, -1
      4    Set Many Flags - 0:0-9, to 1A= 0
           Change Terrain - 1A= X, 1B= Y, 2A= floor
           Move Party - 1A= X, 1B= Y, 1 teleport, -1
             Tell party to repeat the process

    Sequence 3 - Exit rune:
      1  Stuff Done Compare? - 0:1, 1A= 0, 1B= 6, if 2nd flag is lower goto 3, else jump to 2
      2    Stuff Done Compare? - 0:6, 1A= 0, 1B= 1, if 2nd flag is lower goto 3, else jump to 4
      3    Can't Enter - 1A= 1 no enter, -1
             Note: can also use the Can't Enter in Sequence 1
      4    Stuff Done Compare? - 0:1, 1A= 0, 1B= 2, if 2nd flag is lower goto 5, -1
      5      Increment Flag - 0:2, (msg below), 1A= 1, 1B= 0 increase
               Continue forward, next party member can go through
             Swap Terrain - 1A= X, 1B= Y, 2A= floor, 2B= wall/window/portcullis, -1


What it does:  The party is forced into Combat mode.  One by one they go
through (a swapped wall blocks a member from going backwards), first the entry
rune (SDF 0:1 increases by 1), a race rune (SDF 0:3/4/5 increases by 1), then
the exit rune (SDF 0:2 increases by 1), entry wall is swapped for a floor.  The
error checks are Can't Enters if a PC hasn't stepped on the exit rune (thus SDF
0:2 <> SDF 0:1) and not stepping on a race rune (or stepping multiple times on
one) (thus SDF 0:6 <> SDF 0:1).  If SDF 0:1 is less than SDF 0:6 (multiple
steppings on the race runes), the flags are cleared, a floor is placed before
the entry rune, and the party (in Town mode) is moved near the entry rune.
Then the process must be repeated.

v 1.01  Fixed bug of a PC backing off from the entry rune by swapping a wall
        behind the PC.  Thanks to Stareye for finding this.