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Working with many NPCs

 
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Baconlabs
PURPLE IS MANLY




Joined: 15 Mar 2009
Posts: 335
Location: Tennessee
PostPosted: Thu Jun 25, 2009 8:54 pm    Post subject: Working with many NPCs Reply with quote
I've got a very specific idea. In the desert, you've got ordinary cacti (map tiles). Then you've got some living, attacking cacti (NPCs).
What I want to do is have the live cactus shuffle toward the player when he gets close, triggering a battle. This is pretty easy to figure out by itself; just assign an invisible Step-On NPC in a certain perimeter around the NPC cactus, suspend the player, move the cactus, etc. etc.

The problem I'm having is that there are about 10 of these instances on the map, and I want to trigger each one separately (with different NPCs if need be), but using just one script.

I'm sure there's a way, probably with Script Arguments, but I have no idea how to use those. Can anyone help me with this?
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Bob the Hamster
OHRRPGCE Developer




Joined: 22 Feb 2003
Posts: 2526
Location: Hamster Republic (Southern California Enclave)
PostPosted: Fri Jun 26, 2009 7:41 am    Post subject: Reply with quote
What if the script searches the screen and picks the cactus closest to the hero? You could do that with a script like this:

Code:

include,plotscr.hsd

define constant(5, cactus npc id)

plotscript, find nearest cactus, begin
  variable(x, y)
  variable(start x, start y)
  variable(dist x, dist y)
  variable(best x, best y)
  variable(ref)
  variable(found)
 
  # first get the top left corner tile position
  start x := camera pixel x / 20
  start y := camera pixel y / 20

  # no cactus found yet...
  found := false
 
  # then loop through the tiles on the screen
  for(y, start y, start y + 10) do(
    for(x, start x, start x + 16) do(
      ref := NPC at spot(x, y)
      if(ref) then(
        if(get NPC ID(ref) == cactus npc id) then(
          # Found a cactus!
         
          # now get its distance to the hero
          dist x := npc x(ref) -- hero x(me)
          dist y := npc y(ref) -- hero y(me)
 
          if(found == false) then(
            # this is the first cactus we have found
            found := ref
            best x := dist x
            best y := dist y
          )else(
            # we already have a cactus, check if the current one is closer
            if(dist x^2 + dist y^2 << best x^2 + best y^2) then(
              # yes, it is closer
              found := ref
              best x := dist x
              best y := dist y
            )
          )
        )
      )
    )
  )
 
  # Now, if a cactus was found, do an action with it
  if(found) then(
    # do action here
  )
end
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Baconlabs
PURPLE IS MANLY




Joined: 15 Mar 2009
Posts: 335
Location: Tennessee
PostPosted: Fri Jun 26, 2009 1:21 pm    Post subject: Reply with quote
Even better! Thanks James!

EDIT: In realizing just how nifty this script is, I'm definitely going to try and find a use for it outside of just this one map.

Last edited by Baconlabs on Fri Jun 26, 2009 10:15 pm; edited 1 time in total
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Baconlabs
PURPLE IS MANLY




Joined: 15 Mar 2009
Posts: 335
Location: Tennessee
PostPosted: Fri Jun 26, 2009 10:13 pm    Post subject: Reply with quote
Okay, quick thing that should be pointed out in case anyone else tries to do something similar to this.
When performing actions in this zone:
Code:
  # Now, if a cactus was found, do an action with it
  if(found) then(
    # do action here
  )
end

NPC ID numbers MUST be referred to as the variable found. For example:
Code:
walk npc (found,left,4)
wait for npc (found)


This is very important or else the NPCs might activate out of order.
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