Part 13: Gearing Up - Equipment System

Author: jmccardle

game/actions.py

@@ -178,4 +178,14 @@ def perform(self) -> None:
                 "You descend the staircase.", game.color.descend
             )
         else:
-            raise game.exceptions.Impossible("There are no stairs here.")
+            raise game.exceptions.Impossible("There are no stairs here.")
+
+
+class EquipAction(Action):
+    def __init__(self, entity: game.entity.Actor, item: game.entity.Item):
+        super().__init__(entity)
+        
+        self.item = item
+
+    def perform(self) -> None:
+        self.entity.equipment.toggle_equip(self.item)

game/components/equipment.py

@@ -0,0 +1,87 @@
+from __future__ import annotations
+
+from typing import Optional, TYPE_CHECKING
+
+import game.components.base_component
+import game.equipment_types
+
+if TYPE_CHECKING:
+    import game.entity
+
+
+class Equipment(game.components.base_component.BaseComponent):
+    parent: game.entity.Actor
+
+    def __init__(self, weapon: Optional[game.entity.Item] = None, armor: Optional[game.entity.Item] = None):
+        self.weapon = weapon
+        self.armor = armor
+
+    @property
+    def defense_bonus(self) -> int:
+        bonus = 0
+
+        if self.weapon is not None and self.weapon.equippable is not None:
+            bonus += self.weapon.equippable.defense_bonus
+
+        if self.armor is not None and self.armor.equippable is not None:
+            bonus += self.armor.equippable.defense_bonus
+
+        return bonus
+
+    @property
+    def power_bonus(self) -> int:
+        bonus = 0
+
+        if self.weapon is not None and self.weapon.equippable is not None:
+            bonus += self.weapon.equippable.power_bonus
+
+        if self.armor is not None and self.armor.equippable is not None:
+            bonus += self.armor.equippable.power_bonus
+
+        return bonus
+
+    def item_is_equipped(self, item: game.entity.Item) -> bool:
+        return self.weapon == item or self.armor == item
+
+    def unequip_message(self, item_name: str) -> None:
+        self.parent.parent.engine.message_log.add_message(
+            f"You remove the {item_name}."
+        )
+
+    def equip_message(self, item_name: str) -> None:
+        self.parent.parent.engine.message_log.add_message(
+            f"You equip the {item_name}."
+        )
+
+    def equip_to_slot(self, slot: str, item: game.entity.Item, add_message: bool) -> None:
+        current_item = getattr(self, slot)
+
+        if current_item is not None:
+            self.unequip_from_slot(slot, add_message)
+
+        setattr(self, slot, item)
+
+        if add_message:
+            self.equip_message(item.name)
+
+    def unequip_from_slot(self, slot: str, add_message: bool) -> None:
+        current_item = getattr(self, slot)
+
+        if add_message:
+            self.unequip_message(current_item.name)
+
+        setattr(self, slot, None)
+
+    def toggle_equip(self, equippable_item: game.entity.Item, add_message: bool = True) -> None:
+        if (
+            equippable_item.equippable
+            and equippable_item.equippable.equipment_type == game.equipment_types.EquipmentType.WEAPON
+        ):
+            slot = "weapon"
+        else:
+            slot = "armor"
+
+        if getattr(self, slot) == equippable_item:
+            self.unequip_from_slot(slot, add_message)
+        else:
+            self.equip_to_slot(slot, equippable_item, add_message)

game/components/equippable.py

@@ -0,0 +1,44 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+import game.components.base_component
+import game.equipment_types
+
+if TYPE_CHECKING:
+    import game.entity
+
+
+class Equippable(game.components.base_component.BaseComponent):
+    parent: game.entity.Item
+
+    def __init__(
+        self,
+        equipment_type: game.equipment_types.EquipmentType,
+        power_bonus: int = 0,
+        defense_bonus: int = 0,
+    ):
+        self.equipment_type = equipment_type
+
+        self.power_bonus = power_bonus
+        self.defense_bonus = defense_bonus
+
+
+class Dagger(Equippable):
+    def __init__(self) -> None:
+        super().__init__(equipment_type=game.equipment_types.EquipmentType.WEAPON, power_bonus=2)
+
+
+class Sword(Equippable):
+    def __init__(self) -> None:
+        super().__init__(equipment_type=game.equipment_types.EquipmentType.WEAPON, power_bonus=4)
+
+
+class LeatherArmor(Equippable):
+    def __init__(self) -> None:
+        super().__init__(equipment_type=game.equipment_types.EquipmentType.ARMOR, defense_bonus=1)
+
+
+class ChainMail(Equippable):
+    def __init__(self) -> None:
+        super().__init__(equipment_type=game.equipment_types.EquipmentType.ARMOR, defense_bonus=3)

game/components/fighter.py

@@ -14,11 +14,11 @@
 class Fighter(game.components.base_component.BaseComponent):
     parent: game.entity.Actor
 
-    def __init__(self, hp: int, defense: int, power: int):
+    def __init__(self, hp: int, base_defense: int, base_power: int):
         self.max_hp = hp
         self._hp = hp
-        self.defense = defense
-        self.power = power
+        self.base_defense = base_defense
+        self.base_power = base_power
 
     @property
     def hp(self) -> int:
@@ -30,6 +30,28 @@ def hp(self, value: int) -> None:
         if self._hp == 0 and self.parent.ai:
             self.die()
 
+    @property
+    def defense(self) -> int:
+        return self.base_defense + self.defense_bonus
+
+    @property
+    def power(self) -> int:
+        return self.base_power + self.power_bonus
+
+    @property
+    def defense_bonus(self) -> int:
+        if self.parent.equipment:
+            return self.parent.equipment.defense_bonus
+        else:
+            return 0
+
+    @property
+    def power_bonus(self) -> int:
+        if self.parent.equipment:
+            return self.parent.equipment.power_bonus
+        else:
+            return 0
+
     def die(self) -> None:
         if self.engine.player is self.parent:
             death_message = "You died!"

game/components/level.py

@@ -56,14 +56,14 @@ def increase_max_hp(self, amount: int = 20) -> None:
         self.increase_level()
 
     def increase_power(self, amount: int = 1) -> None:
-        self.parent.fighter.power += amount
+        self.parent.fighter.base_power += amount
 
         self.engine.message_log.add_message("You feel stronger!")
 
         self.increase_level()
 
     def increase_defense(self, amount: int = 1) -> None:
-        self.parent.fighter.defense += amount
+        self.parent.fighter.base_defense += amount
 
         self.engine.message_log.add_message("Your movements are getting swifter!")
 

game/entity.py

@@ -7,6 +7,8 @@
 if TYPE_CHECKING:
     import game.components.ai
     import game.components.consumable
+    import game.components.equipment
+    import game.components.equippable
     import game.components.fighter
     import game.components.inventory
     import game.components.level
@@ -78,6 +80,7 @@ def __init__(
         color: Tuple[int, int, int] = (255, 255, 255),
         name: str = "<Unnamed>",
         ai_cls: Type[game.components.ai.BaseAI],
+        equipment: game.components.equipment.Equipment,
         fighter: game.components.fighter.Fighter,
         inventory: game.components.inventory.Inventory,
         level: game.components.level.Level,
@@ -94,6 +97,9 @@ def __init__(
 
         self.ai: Optional[game.components.ai.BaseAI] = ai_cls(self) if ai_cls else None
 
+        self.equipment = equipment
+        self.equipment.parent = self
+        
         self.fighter = fighter
         self.fighter.parent = self
 
@@ -121,6 +127,7 @@ def __init__(
         color: Tuple[int, int, int] = (255, 255, 255),
         name: str = "<Unnamed>",
         consumable: Optional[game.components.consumable.Consumable] = None,
+        equippable: Optional[game.components.equippable.Equippable] = None,
     ):
         super().__init__(
             parent=None,
@@ -133,8 +140,11 @@ def __init__(
         )
 
         self.consumable = consumable
-        
         if self.consumable:
             self.consumable.parent = self
 
+        self.equippable = equippable
+        if self.equippable:
+            self.equippable.parent = self
+        
         self.render_order = game.render_order.RenderOrder.ITEM

game/entity_factories.py

@@ -5,6 +5,8 @@
     HealingConsumable,
     LightningDamageConsumable,
 )
+from game.components.equipment import Equipment
+from game.components.equippable import ChainMail, Dagger, LeatherArmor, Sword
 from game.components.fighter import Fighter
 from game.components.inventory import Inventory
 from game.components.level import Level
@@ -15,7 +17,8 @@
     color=(255, 255, 255),
     name="Player",
     ai_cls=HostileEnemy,
-    fighter=Fighter(hp=30, defense=2, power=5),
+    equipment=Equipment(),
+    fighter=Fighter(hp=30, base_defense=2, base_power=5),
     inventory=Inventory(capacity=26),
     level=Level(level_up_base=200),
 )
@@ -25,7 +28,8 @@
     color=(63, 127, 63),
     name="Orc",
     ai_cls=HostileEnemy,
-    fighter=Fighter(hp=10, defense=0, power=3),
+    equipment=Equipment(),
+    fighter=Fighter(hp=10, base_defense=0, base_power=3),
     inventory=Inventory(capacity=0),
     level=Level(xp_given=35),
 )
@@ -35,7 +39,8 @@
     color=(0, 127, 0),
     name="Troll",
     ai_cls=HostileEnemy,
-    fighter=Fighter(hp=16, defense=1, power=4),
+    equipment=Equipment(),
+    fighter=Fighter(hp=16, base_defense=1, base_power=4),
     inventory=Inventory(capacity=0),
     level=Level(xp_given=100),
 )
@@ -66,4 +71,32 @@
     color=(255, 0, 0),
     name="Fireball Scroll",
     consumable=FireballDamageConsumable(damage=12, radius=3),
+)
+
+dagger = Item(
+    char="/",
+    color=(0, 191, 255),
+    name="Dagger",
+    equippable=Dagger(),
+)
+
+sword = Item(
+    char="/",
+    color=(0, 191, 255),
+    name="Sword",
+    equippable=Sword(),
+)
+
+leather_armor = Item(
+    char="[",
+    color=(139, 69, 19),
+    name="Leather Armor",
+    equippable=LeatherArmor(),
+)
+
+chain_mail = Item(
+    char="[",
+    color=(139, 69, 19),
+    name="Chain Mail",
+    equippable=ChainMail(),
 )

game/equipment_types.py

@@ -0,0 +1,6 @@
+from enum import auto, Enum
+
+
+class EquipmentType(Enum):
+    WEAPON = auto()
+    ARMOR = auto()