Index

1. Programming Proverbs

• 10. ‘‘Use good mnemonic names.’’
• Henry F. Ledgard, ‘‘Programming Proverbs: Principles of Good Programming with Numerous Examples to Improve Programming Style and Proficiency’’, (Hayden Computer Programming Series), Hayden Book Company, 1st edition, ISBN-13: 978-0810455221, December 1975.

2. Implementing labels in chisel/pen2map

• you will need to back port the changes you made last week into your working chisel $HOME/Sandpit/chisel
• an easy way to do this is to use diff and patch
  • hint read man diff and man patch

• $ cd $HOME/Sandpit/labels/chisel
  $ git diff
  $ git diff > $HOME/Sandpit/labels/label-diffs
  $ cd $HOME/Sandpit/chisel
  $ patch -p1 < $HOME/Sandpit/labels/label-diffs

• the command git diff generates a list of differences between each file and the last git clone
• the command patch tries to apply these differences to the current directory
  • this is used a lot in industry and it is a very efficient way to distribute source code changes
  • occasionally you need to manual apply a patch which fails
  • normally patch will complain and store a .rej file
• these notes are better read using the pdf version
• 
  $HOME/Sandpit/chisel/maps/label3.txt

  define 1 room 1
  define s worldspawn
  define i light
  define a ammo ammo_shells_large 16
  define l label the_ammo_loc [a]
  define P monster python_doommarine_mp
  
  
  ####################################
  # 1                                #
  #          P                       #
  #  s                               #
  #                      l           #
  #                                  #
  ####################################

• given the map source file above can be transformed into a pen map using
• 
  $ cd $HOME/Sandpit/chisel/python
  $ python3 txt2pen.py ../maps/label3.txt
• if you want autolights you need to add the -l option

• ROOM 1
     WALL
       1 7  36 7
       36 7  36 1
       36 1  1 1
       1 1  1 7
     MONSTER python_doommarine_mp AT 12 5
     AMMO ammo_shells_large AMOUNT 16 AT 24 4
     SPAWN PLAYER AT 4 4
     INSIDE AT 4 5
     LABEL AT 24 4 the_ammo_loc
  END
  
  END.

3. Adding labels to chisel/pen2map

• keep the comment grammer up to date

• python/pen2map.py

  roomDesc := "ROOM" integer
               { doorDesc | wallDesc | treasureDesc | ammoDesc |
                 lightDesc | insideDesc | weaponDesc | monsterDesc |
                 spawnDesc | defaultDesc | soundDesc | labelDesc } =:

• which states a room starts with a keyword ROOM followed by an integer followed by a description
  • one of which is the labelDesc
• 
  python/pen2map.py

  labelDesc := ’LABEL’ ’AT’ posDesc string =:

• the grammer comment is at the top of the source file in a multi line comment
• 
  python/pen2map.py

  class roomInfo:
      def __init__ (self, r, w, d):
          self.walls = orderWalls (r, w)
          ...
          self.floorLevel = None
          self.inside = None
          self.defaultColours = {}
          self.defaultTextures = {}
          self.sounds = []
          self.labels = []

• 
  python/pen2map.py

       def addSound (self, s, pos):
           self.sounds += [[s, pos]]
       def addLabel (self, label, pos):
          self.labels += [[label, pos]]

• 
  python/pen2map.py

  def roomDesc ():
      global curRoom, curInteger, curRoomNo, verbose
      if expecting ([’ROOM’]):
          expect ("ROOM")
          if integer ():
              curRoomNo = curInteger
              curRoom = newRoom (curRoomNo)
              if debugging:
                  print("roomDesc", curRoomNo)
              while expecting ([’DOOR’, ’WALL’, ’TREASURE’, ’AMMO’, ’WEAPON’, ’LIGHT’, ’INSIDE’, ’MONSTER’, ’SPAWN’, ’DEFAULT’, ’SOUND’, ’LABEL’]):
                  if expecting ([’DOOR’]):
                      doorDesc ()
                  elif expecting ([’WALL’]):
                      wallDesc ()

• 
  python/pen2map.py

                  ...
                  elif expecting ([’WEAPON’]):
                      weaponDesc ()
                  elif expecting ([’LABEL’]):
                      labelDesc ()
                  elif expecting ([’LIGHT’]):
                      lightDesc ()
                  elif expecting ([’INSIDE’]):
                      insideDesc ()
                  elif expecting ([’MONSTER’]):
                      monsterDesc ()
                  ...
              expect (’END’)
              return True
          else:
              errorLine (’expecting an integer after ROOM’)
      return False

• 
  python/pen2map.py

  #
  #  labelDesc := ’LABEL’ ’AT’ posDesc string =:
  #
  
  
  def labelDesc ():
      expect (’LABEL’)
      expect (’AT’)
      if posDesc ():
          label = get ()
          curRoom.addLabel (label, curPos)
          return True
      else:
          errorLine (’expecting a position for a label’)
      return False

• 
  python/pen2map.py

  def generateWeapons (o, e):
      n = 1
      for r in list(rooms.keys ()):
          if debugging:
              print(rooms[r].weapons)
          for weapon_kind, xy in rooms[r].weapons:
              o.write ("// entity " + str (e) + ’\n’)
              o.write ("{\n")
              o.write (’    "inv_item" "4"\n’)
              o.write (’    "classname" "’ + weapon_kind + ’"\n’)
              o.write (’    "name" "’ + weapon_kind + ’"\n’)
              o.write (’    "origin" "’)
              xyz = toIntList (xy) + [-invSpawnHeight]
              xyz = subVec (xyz, [minx, miny, getFloorLevel (r)])
              v = midReposition (xyz)
              o.write (’%f %f %f"\n’ % (v[0], v[1], v[2]))
              o.write ("}\n")
              n += 1
              e += 1
      return o, e

• 
  python/pen2map.py

  def generateLabels (o, e):
      n = 1
      for r in list(rooms.keys ()):
          if debugging:
              print (rooms[r].labels)
          for label_desc, xy in rooms[r].labels:
              o.write ("// entity " + str (e) + ’\n’)
              o.write ("{\n")
              o.write (’    "classname" "item_default"\n’)
              o.write (’    "label" "’ + label_desc + ’"\n’)
              o.write (’    "origin" "’)
              xyz = toIntList (xy) + [-invSpawnHeight]
              xyz = subVec (xyz, [minx, miny, getFloorLevel (r)])
              v = midReposition (xyz)
              o.write (’%f %f %f"\n’ % (v[0], v[1], v[2]))
              o.write ("}\n")
              n += 1
              e += 1
      return o, e

• 
  python/pen2map.py

  def generateMap (o):
       o, e    = generateLights (o, e)
       o, e    = generateAmmo (o, e)
       o, e    = generateSounds (o, e)
       o, e    = generateWeapons (o, e)
       o, e    = generateLabels (o, e)
       if statistics:
           print("Total rooms =", len (list(rooms.keys ())))
           print("Total cuboids =", len (list(cuboids.keys ())))

4. Testing the tool chain

• $ cd $HOME/Sandpit/chisel/python
  $ python3 txt2pen.py -l ../maps/label3.txt
  $ python3 txt2pen.py -l -o tiny.pen ../maps/label3.txt
  $ cat tiny.pen
  $ PYTHONPATH=student python3 pen2map.py tiny.pen
  $ PYTHONPATH=student python3 pen2map.py -o tiny.map tiny.pen

• if this works then you can simplify these commands to:
• 
  $ cd $HOME/Sandpit/chisel/python
  $ ./developer-txt2map ../maps/label3.txt
• now download a new copy of doom3 and try out the new bot code
  • you will need to remove the current pybot-dhewm3 code (or move it out of the way)
• 
  $ ssh mcgreg
  $ cd $HOME/Sandpit
  $ git clone https://github.com/gaiusm/pybot-dhewm3
  $ exit
• now recompile doom3
• start the python bot
• 
  $ cd $HOME/Sandpit/git-doom3/pybot-dhewm3/python-bot
  $ python3 python_doommarine.py 0
• examine the code in $HOME/Sandpit/git-doom3/pybot-dhewm3/python-bot/python_doommarine.py
• look at the code which obtains the label doom3 coordinate
  • the python bot will briefly come to life and then print out the label position

Index

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