=head1 CROSSFIRE+ OBJECT AND INTERNALS DOCUMENTATION

Here is all information about the object types Crossfire+
supports at the moment. This is not a complete documentation (yet)
and browsing the source is still recommended to learn about
the objects that aren't documented here.

This documentation is in a sketchy state. It's mostly
used to collect notes about the internal behaviour of the
objects.

=head2 About archetypes and objects

Field denotes an attribute of an archetype.
This is an example of an archetype:

   Object button_trigger
   name button
   type 30
   face button_sma.111
   anim
   button_sma.111
   button_sma.112
   mina
   is_animated 0
   exp 30
   no_pick 1
   walk_on 1
   walk_off 1
   editable 48
   visibility 50
   weight 1
   end

This archetype has the name 'button_trigger' and the objects that
inherit from this archetype have the name 'button'.

The next field 'type' decides the main behaviour of this archetype.
For a comprehensive list of types see include/define.h. For this case
you might find a line like:

   #define TRIGGER_BUTTON           30

The server internally works with objects that 'inherit' attributes from
an archetype. They have a similar set of attributes.

The following documentation will also document the meaning of code internal
attributes of objects. These attributes are marked as '(internal)' and can't
or shouldn't be set by an archetype. If the internal names differs the
external name (for the archetypes) for the attribute is written behind it.

=head2 Description of generic archetype and object attributes

These are the fields that most of the objects have and/or their
default behaviour.

=over 4

=item name <string>

The name of the object.

=item name_pl <string>

The name of a collection of these objects (the plural of the name).

=item face <facename>

The graphical appearance of this object.

=item x <number>

The x position of the object when it is on a map.

=item y <number>

The y position of the object when it is on a map.

=item map (internal)

The map the object is on.

=item invisible <number>

If the <number> is greater than 0 the object is invisible.
For players this field reflects the duration of the invisibility
and is decreased every tick by 1.

For non-player objects this field is not changed by server ticks.

=item speed <number>

If this field is greater than MIN_ACTIVE_SPEED (~0.0001) the object is placed
on the active object list and will be processed each tick (see also speed_left!).

If the speed field drops below the MIN_ACTIVE_SPEED the object is removed
from the active object list and it won't experience any processing per tick.

=item speed_left <number>

If this field is greater than 0 and the object is on the
active list (mostly means it's speed is also greater than 0):

   - speed_left is decreased by 1
   - and this object is processed and experiences a server tick.

If the object is on the active list and speed_left is lower or
equal to 0 the absolute value of the speed field is added to speed_left
on the end of the tick.

This means: the lower the speed field is (but still above MIN_ACTIVE_SPEED)
the more seldom the object is processed. And the higher the speed field is
the more often the object is processed.

=item connected <number>

When this field is set the object will be linked to a connection with the
id <number>. What happens when the connection is 'activated' depends on the
type of the object.

When FLAG_ACTIVATE_ON_PUSH and FLAG_ACTIVATE_ON_RELEASE they will control
when to activate the object, see description of these below for further details.

=item no_drop (0|1)

Sets the flag FLAG_NO_DROP.
See Flags section below.

=item applied (0|1)

Sets the flag FLAG_APPLIED.
See Flags section below.

=item is_used_up (0|1)

Sets the flag FLAG_IS_USED_UP.
See Flags section below.

=item auto_apply (0|1)

Sets the flag FLAG_AUTO_APPLY.
See Flags section below.

=item no_steal (0|1)

Sets the flag FLAG_NO_STEAL.
See Flags section below.

=item reflecting (0|1)

Sets the flag FLAG_REFLECTING.
See Flags section below.

=item reflect_spell (0|1)

Sets the flag FLAG_REFL_SPELL.
See Flags section below.

=item no_skill_ident (0|1)

Sets the flag FLAG_NO_SKILL_IDENT.
See Flags section below.

=item activate_on_push (0|1) (default: 1)

Sets the flag FLAG_ACTIVATE_ON_PUSH.
See Flags section below.

=item activate_on_release (0|1) (default: 1)

Sets the flag FLAG_ACTIVATE_ON_RELEASE.
See Flags section below.

=item editable (more than deprecated)

This field had a special meaning for crossedit, which used parts
of the server code for editing. Wherever you see this attribute being
set in an archetype ignore it and/or remove it. No code interprets this
field anymore.

=back

=head3 Flags

Here are the effects of the flags described.

=over 4

=item FLAG_NO_DROP

An object can't be picked up and dropped.

=item FLAG_APPLIED

This flag mostly states whether this object has been 'applied' by the player.
For objects that are applied by the code or have this flag set in the archetype
it mostly means 'this object is active'.

For example the player adjustments of the hp/sp/grace fields and inheritance
of flags from objects in his inventory is toggled by this flag.

=item FLAG_IS_USED_UP

This flag controls whether an object is 'used up'. If it is set the 'food' field
of the object is decreased by 1 each tick, and if it is lower or equal 0 after tha
it is removed.

If also the flag FLAG_APPLIED is set, the 'duration' field controls whether
this object is removed or not, see the Force type below for the meaning
of the duration field in this context.

If FLAG_APPLIED is not set the object is destroyed.

=item FLAG_IS_A_TEMPLATE (internal use)

This flag is set on the inventory of generators like CREATORs and CONVERTERs,
or other objects that have the flags FLAG_GENERATOR and FLAG_CONTENT_ON_GEN set.

=item FLAG_AUTO_APPLY

This flag has currently only meaning for the TREASURE type, see below.

=item FLAG_ACTIVATE_ON_PUSH

This flag has only meaning for objects that can be linked together
with the 'connected' field and controls wether the object should
be activated when the connection is 'pushed' or it is 'released'.

What 'pushed' and 'released' means depends on the object that
activates the connection.

This flag is by default on.

=item FLAG_ACTIVATE_ON_RELEASE

This flag has only meaning for objects that can be linked together
with the 'connected' field and controls wether the object should
be activated when the connection is 'pushed' or it is 'released'.

What 'pushed' and 'released' means depends on the object that
activates the connection.

This flag is by default on.

=item FLAG_NO_STEAL

When this flag is set this object can't be stolen. The flag will be
resetted once the object is placed on a map.

When this flag is set on a monster it can defent attempts of stealing
(but in this context the flag is only used internally).

=item FLAG_NO_SKILL_IDENT

This flag is mostly used internal and prevents unidentified objects
(objects which don't have FLAG_IDENTIFIED set) being identified by
skills.

This flag is used to mark objects to never being identified by a skill
once a player failed to identify an object. So that multiple tries
of identifying aren't more effective than one.

=item FLAG_REFLECTING

This flag is used by spell effects (eg. SP_BOLT), THROWN_OBJ and ARROW
to indicate whether this object reflects off walls.

=item FLAG_REFL_SPELL

This flag indicates whether something reflects spells, like spell reflecting
amuletts.

=back

=head2 Description of type specific attributes

The beginning of the headers of the following subsection
are the server internal names for the objects types, see include/define.h.

=head3 TRANSPORT - type 2 - Player transports

This type is implemented by the transport extension and has currently no special
attributes that affect it.

=head3 ROD - type 3 - Rods that fire spells

Rods contain spells and can be fired by a player.

=over 4

=item level <number>

This attribute is used for calculating the spell level that can be fired
with this rod, it's also the maximum level of the spell that can be fired.
The level of the spell that is being fired depends mostly on
the 'use magic item' skill level of the player and 1/10 of the level of the
rod is added as bonus.

=item hp <number>

The amount of spellpoints this rod has left.

=item maxhp <number>

The maximum amount of spellpoints this rod has.

=item skill <skill name>

This field determines which skill you need to apply this object.

=back

=head3 TREASURE - type 4 - Treasures

This type of objects are for random treasure generation in maps.
If this object is applied by a player it will replace itself with it's
inventory. If it is automatically applied
generate a treasure and replace itself with the generated treasure.

Chests are also of this type, their treasures are generated by
the auto apply code on map instantiation.

=over 4

=item hp <number>

The number of treasures to generate.

=item exp <level>

If FLAG_AUTO_APPLY is not set the exp field has no further meaning
and the difficulty for the treasurecode only depends on the maps difficulty,
otherwise the exp field has the following meaning:

If this field is not 0 it is passed as the difficulty
to the treasure generation code to determine how good, how much
worth a treasure is or what bonuses it is given by the treasure code.

If this field is not set or 0 the difficulty of the map is passed to the treasure
generation code.

=item randomitems <treasurelist>

The treasurelist to use to generate the treasure which is put in the
treasure objects inventory.

=back

=head3 POTION - type 5 - Potions for drinking and other nastynesses

These objects contain a spell and will emit it on apply, which most
of the time has the meaning of 'drinking'.

If no resistancy field, stat field or attacktype is set and no spell
is put in the potion by the sp field or the randomitems the
potion will become an artifact and the artifact code decides which kind
of potion will be generated.

If the potion has FLAG_CURSED or FLAG_DAMNED set the usage of this potion
will yield an explosion and hurt the player.

=over 4

=item Str, Dex, Con, Int, Wis, Cha, Pow <number>

These stat fields determine how many stat points the player gets
when he applies this potion.

If FLAG_CURSED or FLAG_DAMNED is set the player will loose that many stat points.

=item sp <number>

If this field is set and the randomitems field is not set
the field is interpreted as spell number, please look the right
number up in common/loader.C.

If this field is set the randomitems field will be unset by the
map loading code.

=item attacktype <attacktype>

This field has some special meaning in potions, currently the
bits for AT_DEPLETE and AT_GODPOWER control whethere this is a
restoration potion or improvement potion.
See include/attackinc.h for the bits of these types.

If AT_DEPLETE is set the player will be restored and the ARCH_DEPLETION
will be removed from him. If the potion has FLAG_CURSED or FLAG_DAMNED
set the player will be drained a random stat by inserting an ARCH_DEPLETION
into him.

If AT_GODPOWER is enabled the player will gain +1 maxvalue in his hp, sp or grace stat.
When the potion has FLAG_CURSED or FLAG_DAMNED set he will loose one in one of these stats.

=item resist_<resistancy> <number>

If this stat is set and no spell is in the potion the potion
will create a force that give the player this specific resistancy.
The forces type will be changed to POTION_EFFECT (see POTION_EFFECT type below)
and the potion will last 10 times longer than the default force archetype
FORCE_NAME (at the moment of this writing spell/force.arc).

=item randomitems <treasurelist>

The inventory/spell of the potion will be created by calling the treasure code
with the treasurelist specified here. (I guess it's highly undefined what
happens if there is not a spell in the potions inventory).

=item on_use_yield <archetype>

When this object is applied an instance of <archetype> will be created.

=item subtypes <potion subtype>

see include/spells.h for possible potion subtypes, there are currently 4:

=over 4

=item POT_SPELL

Unused, default behaiour of a potion.

=item POT_DUST

This potion can be thrown to cast the spell that it has in it's inventory,
the behaviour is not defined if there is not a spell in the inventory and the
server will log an error.

=item POT_FIGURINE

Unused, default behaiour of a potion.

=item POT_BALM

Unused, default behaiour of a potion.

=back

=back

=head3 FOOD - type 6 - Eatable stuff

This is for objects that are representing general eatables like
beef or bread.

The main difference between FOOD, FLESH and DRINK is that they
give different messages.

The specialty of FLESH is that it inherits the resistancies of the
monsters it was generated in and will let dragons raise their resistancies
with that. If the monster has the POISON attacktype the FLESH
will change into POISON.

If a player runs low on food he will grab for FOOD, DRINK and POISON
and if he doesn't find any of that he will start eating FLESH.

=over 4

=item title <string>

If the food has a title or is cursed it is considered 'special', which means that the
fields Str, Dex, Con, Int, Wis, Pow, resist_<resistancy>, hp and sp
are interpreted and have further effects on the player.

The higher the food field is the longer the improvement of the player lasts
(except for hp and sp).

=item food <number>

This is the amount of food points the player gets when he eats this.

=item on_use_yield <archetype>

When this object is applied an instance of <archetype> will be created.

=back

=head3 POISON - type 7 - Poisonous stuff

This type is for objects that can poison the player when drinking.
When applied it will hit the attacked with AT_POISON and will create
a POISONING object in the one who was hit.

=over 4

=item level <number>

This field affects the propability of poisoning. The higher the level difference
between the one who is hit and the poision the mose propable it is the attacked
one will be poisoned.

=item slaying <race>

On poison this field has the usual meaning of 'slaying', when the
ones race matches the slaying field the damage done by the poison
is multiplied by 3.

=item hp <number>

This is the amount of damage the player will receive from applying this.  The
attacktype AT_POISON will be used to hit the player and the damage will
determine the strenght, duration and depletion of stats of the poisoning.  The
created POISONING object which is being placed in the one who was attacked will
get the damage from this field (which is maybe adjusted by slaying or the
resistancies).

=item food <number>

1/4 of <number> will be drained from the players food.

=item on_use_yield <archetype>

When this object is applied an instance of <archetype> will be created.

=back

=head3 BOOK - type 8 - Readable books

This type is basically for representing text books in the game.

Reading a book also identifys it (if FLAG_NO_SKILL_IDENT is not set).

=over 4

=item msg <text>

This is the contents of the book. When this field is unset
at treasure generation a random text will be inserted.

=item skill <skill name>

The skill required to read this book. (The most resonable
skill would be literacy).

=item exp <number>

The experience points the player get for reading this book.

=item subtype <readable subtype>

This field determines the type of the readable.
Please see common/readable.C in the readable_message_types table.

=back

=head3 CLOCK - type 9 - Clocks

This type of objects just display the time when being applied.

=head3 LIGHTNING - type 12 - Lightnings (DEPRECATED, see SPELL_EFFECT subtype SP_BOLT)

This is a spell effect of a moving bolt. It moves straigt forward
through the map until something blocks it.
If FLAG_REFLECTING is set it even reflects on walls.

FLAG_IS_TURNABLE should be set on these objects.

=over 4

=item move_type <movetype>

This field affects the move type with which the lightning moves through
the map and which map cells will reflect or block it.

=item attacktype <attacktype>

The attacktype with which it hits the objects on the map.

=item dam <number>

The damage this bolt inflicts when it hits objects on the map.

=item Dex <number>

This is the fork percentage, it is reduced by 10 per fork.
And the damage is halved on each fork.

=item Con <number>

This value is a percentage of which the forking lightning
is deflected to the left. This value should be mostly used internally.

=item duration <number>

The duration the bolt stays on a map cell. This field is decreased each time
the object is processed (see the meaning of speed and speed_left fields in
the object general description).

=item range <number>

This is the range of the bolt, each space it advances this field is decreased.

=back

=head3 ARROW - type 13 - Arrows

This is the type for objects that represent projectiles like arrows.
The movement of THROWN_OBJs behave similar to this type.

Flying arrows are stopped either when they hit something blocking
(move_block) or something which is alive.
If it hits something that is alive, which doesn't have FLAG_REFL_MISSILE
set, it will inflict damage. If FLAG_REFL_MISSILE is set it will inflict
damage with a small chance which is affected by the 'level' field of the arrow.

If FLAG_REFLECTING is set on the arrow it will bounce off everything
that is not alive and blocks it's movement.

When an arrow is being shot it's dam, wc, attacktype, slaying fields will
be saved in the sp, hp, grace and spellarg fields of the object, to restore them
once the arrow has been stopped.

=over 4

=item dam <number>

The amount of damage that is being done to the victim that gets hit.
This field is recomputed when the arrow is fired and will consist
of the sum of a damage bonus (see description of the BOW type),
the arrows 'dam' field, the bows 'dam' field, the bows 'magic' field
and the arrows magic field.

=item wc <number>

The weaponclass of the arrow, which has effect on the propability of hitting.

It is recomputed when the arrow is being fired by this formula:

  wc = 20 - bow->magic - arrow->magic - (skill->level or shooter->level)
          - dex_bonus - thaco_bonus - arrow->stats.wc - bow->stats.wc + wc_mod

When the arrow is not being shot by an player dex_bonus and thaco_bonus and the
level is not added. 

The wc_mod is dependend on the fire mode of the bow.  For a more detailed
explanation of dex_bonus, thaco_bonus and wc_mod please consult the code.

=item magic <number>

This field is added to the damage of the arrow when it is shot and
will also improve it's speed by 1/5 of it's value.

=item attacktype <attacktype>

Bitfield which decides the attacktype of the damage, see include/attackinc.h
On fireing the attacktype of the bow is added to the arrows attacktype.

=item level <number> (interally used)

The level of the arrow, this affects the propability of piercing FLAG_REFL_MISSILE,
see above in the ARROW description.

The level is set when the arrow is fired to either the skill level or the
shooters level. 

=item speed <number> (internal)

This field shouldn't be set directly in the archetype, the arrow will get it's
speed from the bow.  This fields value has to be atleast 0.5 or otherwise the
arrow will be stopped immediatly.

On fireing the speed of the arrow is computed of 1/5 of the
sum of the damage bonus (see BOW), bow magic and arrow magic. After that 1/7
of the bows 'dam' field is added to the speed of the arrow.

The minimum speed of an arrow is 1.0.

While flying the arrows speed is decreased by 0.05 each time it's moved.

If the speed is above 10.0 it goes straight through the creature it hits and
it's speed is reduced by 1. If the speed is lower or equal 10.0 the arrow is
stopped and either sticked into the victim (see weight field description) or
put on it's map square (if it didn't break, see description of the food field).

=item weight <number>

This field is the weight of the arrow, if the weight is below or equal 5000 (5 kg)
the arrow will stick in the victim it hits. Otherwise it will fall to the ground.

=item food <number>

The breaking percentage. 100% means: breaks on usage for sure.

=item inventory (internal)

If the flying/moving object has something in it's inventory and it stops, it
will be replaced with it's inventory. Otherwise it will be handled as usual,
which means: it will be calculated whether the arrow breaks and it will be
reset for reuse.

=item slaying <string>

When the bow that fires this arrow has it's slaying field set it is copied
to the arrows slaying field. Otherwise the arrows slaying field remains.

=item move_type <movetype> (internally used)

This field is set when the arrow is shot to MOVE_FLY_LOW.

=item move_on <movetype> (internally used)

This field is set when the arrow is shot to MOVE_FLY_LOW and MOVE_WALK.

=item race <string>

The race field is a unique key that assigns arrows, bows and quivers. When
shooting an arrow the bows race is used to search for arrows (which have the
same race as the bow) in the players inventory and will recursively search in
the containers (which are applied and have the same race as the bow and the arrow).

=back

=head3 BOW - type 14 - Bows, those that fire ARROWs

TODO, but take into account ARROW description above

=head3 WEAPON - type 15 - Weapons

This type is for general hack and slash weapons like swords, maces
and daggers and and ....

=over 4

=item weapontype <type id>

decides what attackmessages are generated, see include/define.h

=item attacktype <bitmask>

bitfield which decides the attacktype of the damage, see include/attackinc.h

=item dam <number>

amount of damage being done with the attacktype

=item item_power <level>

the itempower of this weapon.

=item name

the name of the weapon.

=item level (internal)

The improvement state of the weapon.
If this field is greater than 0 the 'name' field starts with the
characters name who improved this weapon.

=item last_eat (internal)

seems to be the amount of improvements of a weapon,
the formular for equipping a weapon seems to be (server/apply.C:check_weapon_power):

  ((who->level / 5) + 5) >= op->last_eat

=item last_sp

the weapon speed (see magic description)

=item food <number>

addition to food regeneration of the player

=item hp <number>

addition to health regeneration

=item sp <number>

addition to mana regeneration

=item grace <number>

addititon to grace regeneration

=item gen_sp_armour <number>

the players gen_sp_armour field (which is per default 10) is added the <number> amount.
gen_sp_armour seems to be a factor with which gen_sp in do_some_living()
is multiplied:  gen_sp *= 10/<number>
meaning: values > 10 of gen_sp_armour limits the amout of regenerated
spellpoints.

generally this field on weapons is in ranges of 1-30 and decides the slowdown of the
sp regeneration.

=item body_<body slot/part>

the part of the body you need to use this weapon, possible values should be
looked up in common/item.C at body_locations.

=item resist_<resistnacy> <number>

this is the factor with which the difference of the players resistancy and 100%
is multiplied, something like this:

   additional_resistancy = (100 - current_resistanct) * (<number>/100)

if <number> is negative it is added to the total vulnerabilities,
and later the total resistance is decided by:

  'total resistance = total protections - total vulnerabilities'

see also common/living.C:fix_player

=item patch_(attuned|repelled|denied)

this field modifies the pathes the player is attuned to, see include/spells.h PATH_*
for the pathes.

=item luck <number>

this luck is added to the players luck

=item move_type

if the weapon has a move_type set the player inherits it's move_type

=item exp <number>

the added_speed and bonus_speed of the player is raised by <number>/3.
if <number> < 0 then the added_speed is decreased by <number>

=item weight

the weight of the weapon

=item magic

the magic field affects the amounts of the following fields:

  - wc : the players wc is adjusted by: player->wc -= (wc + magic)

  - ac : the players ac is lowered by (ac + magic) if (player->ac + magic) > 0

  - dam: the players dam is adjusted by: player->dam += (dam + magic)

  - weapon speed (last_sp): weapon_speed is calculated by: (last_sp * 2 - magic) / 2
                            (minium is 0)

=item ac <number>

the amount of ac points the player's ac is decreased when applying this object.

=item wc <number>

the amount of wc points the player's wc is decreased when applying this object.

=back

=head4 Player inherits following flags from weapons:

   FLAG_LIFESAVE
   FLAG_REFL_SPELL
   FLAG_REFL_MISSILE
   FLAG_STEALTH
   FLAG_XRAYS
   FLAG_BLIND
   FLAG_SEE_IN_DARK
   FLAG_UNDEAD

=head3 GRIMREAPER - type 28 - Grimreapers

These type are mostly used for monsters, they give the
monster the ability to dissapear after 10 hits with AT_DRAIN.

=over 4

=item value <number>

This field stores the hits the monster did yet.

=back

=head3 CREATOR - type 42 - Object creators

Once a creator is activated by a connection it creates a number of objects
(cloned from it's inventory or a new archetype from the other_arch slot).

If FLAG_LIVESAFE is set the number of uses is unlimited.

=over 4

=item hp <number>

If FLAG_LIVE_SAVE is not set it is the absolute number of times the creator can
be used.

=item speed <number>

If speed is set the creator will create an object periodically,
see speed and speed_left fields in general object attribute description
for more details on how this period works.

=item slaying <string>

If set the generated object's name and
title will be set to this.

=item other_arch <string>

If the inventory of the creator is empty objects of the
archetype <string> will be generated.

=item connected <number>

See generic object attribute section.

=back

=head3 DRINK - type 54 - Drinkable stuff

See FOOD description.

=head3 CHECK_INV - type 64 - Inventory checkers

This object checks whether the player has a specific item in his
inventory when he moves above the inventory checker. If the player has
the item (or not, which can be controlled with a flag) a connection will be triggered.

If you set move_block you can deny players and monsters to reach the space where
the inventory checker is on, see 'move_block' description below.

The conditions specified by hp, slaying and race are concationated with OR.
So matching one of those conditions is enough.

=over 4

=item move_block <move type bitmask>

If you set this field to block a movetype the move code will block any moves
onto the space with the inventory checker, IF the moving object doesn't have
(or has - if last_sp = 0) the item that the checker is searching for.

=item last_sp (0|1)

If last_sp is 1 'having' the item that is being checked for will
activate the connection or make the space with the checker non-blocking.
If last_sp is 0 'not having' the item will activate the connection
or make the space with the checker non-blocking.

=item last_heal (0|1)

If last_heal is 1 the matching item will be removed if the inventory checker
activates a connection and finds the item in the inventory.

(A inventory checker that blocks a space won't remove anything from inventories)

=item hp <number>

If this field is not 0 the inventory checker will search for an object
with the type id <number>.

=item slaying <string>

If this field is set the inventory checker will search for an object that
has the same string in the slaying field (for example a key string of a key).

=item race <string>

If this field is set the inventory checker will search for an object which
has the archetype name that matches <string>.

=item connected <connection id>

This is the connection that will be activated. The connection is
'pushed' when someone enters the space with the inventory checker,
and it is 'released' when he leaves it.

See also the description of the connected field in the generic object attribute
section.

=back

=head3 FLESH - type 72 - Organs and body parts

See FOOD description.

=head3 MISC_OBJECT - type 79 - Misc. objects

A type for any object that has no special behaviour.

=head3 DUPLICATOR - type 83 - Duplicators or: Multiplicators

This type of objects multiplies objects that are above it when it is activated.
You can even multiply by 0, which will destroy the object.

=over 4

=item level <number>

The multiplicator, if set to 0 or lower it will destroy the objects above it.

=item other_arch <string>

The archetype name of the objects which will be multiplied.

=item connected <number>

See generic object attribute section.

=back

=head3 HOLE - type 94 - Holes

Holes are holes in the ground where objects can fall through.  When the hole
opens and/or is completly open all objects above it fall through (more
precisely: if their head is above the hole).

When the HOLE is activated it's speed is set to 0.5.

Trapdoors can only transfer the one who falls through to other coordinates
on the B<same> map.

=over 4

=item maxsp (0|1)

This field negates the state of the connection: When maxsp is 1 the pit will
open/close when the connection is deactivated.  Otherwise it will open/close
when the connection is activated. This field only has effect when the
connection is triggered. So if you put a closed hole on a map, and the
connection is deactivated, and maxsp is 1 the hole will remain closed until the
connection was triggered once.

=item connected <connection id>

This is the connection id, which lets the hole opening or closing when
activated. The flags FLAG_ACTIVATE_ON_PUSH and FLAG_ACTIVATE_ON_RELEASE control
at which connection state the object is activated.

For example: if FLAG_ACTIVATE_ON_RELEASE is set to 0 the hole won't react when
the connection is released.

=item wc <number> (internal)

This is an internal flag. If it is greater than 0 it means that the hole is not
yet fully open. More preciesly: this field is the animation-step and if it is
set to the 'closed' step of the animation the hole is closed and if it is on
the 'open' animation step (wc = 0), the hole is open.

=item sp <number>

The destination y coordinates on the same map.

=item hp <number>

The destination x coordinates on the same map.

=back

=head3 POISONING - type 105 - The poisoning of players and monsters

This type is doing the actual damage to the ones who were attacked
via AT_POISON (or drank POISON).

The duration is handled via the FLAG_IS_USED_UP mechanism (please look
there for details).

=over 4

=item dam <number>

Each time the poisoning is processed (which is determined by the speed and speed_left
fields, see the general object attributes above) it hits the player with
<number> damage and the AT_INTERNAL attacktype (means: it will simply
hit the player with no strings attached).

=item food <number>

Just a note: The posion is removed when food == 1 and not when
the whole duration is up, because the POISONING code has to remove
the poison-effects from the player before the FLAG_IS_USED_UP mechanism
deletes the POISONING object.

=back

=head3 FORCE - type 114 - Forces

Forces are a very 'thin' type. They don't have much behaviour other than
disappearing after a time and/or affecting the player if they are in his
inventory.

Forces only take effect on the player if they have set FLAG_APPLIED.

Whether the duration field is processed or not a tick is controlled via the
speed and speed_left field. Look above at the generic description of these
fields.

NOTE: Setting FLAG_IS_USED_UP on an force will also consider the 'food' field
like stated above in the FLAG_IS_USED_UP description. BUT: If the food field reaches
0 before duration and FLAG_APPLIED is set, the force will last for 'duration'.
If the FLAG_APPLIED is not set the force is removed when food reaches 0.
Generally this means: FLAG_IS_USED_UP doesn't have good semantics on forces.

=over 4

=item duration

While this field is greater than 0 the force/object is not destroyed.  It is
decreased each tick by 1.

If it reaches 0 the force/object is destroyed.

This field can have this meaning for B<any> object if that object has
FLAG_IS_USED_UP and FLAG_APPLIED set. See the description of FLAG_IS_USED_UP
what happens then.

=back

=head3 POTION_EFFECT - type 115 - Potion effects (resistancies)

This object is generated by the POTION code when the potion is a resistance
giving potion. It has mainly the same behaviour as a FORCE.

The specialty of the potion effect is that the resistancy it gives is absolute,
so if you drin a resistancy potion of fire+60 you will get 60% resistancy to
fire.

Multiple potion effects only give you the maximum of their resistancy.