Create the game map, and finish Part 2

actions.py

@@ -1,9 +1,27 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from engine import Engine
+    from entity import Entity
+
 class Action:
-    pass
+    def perform(self, engine: Engine, entity: Entity) -> None:
+        """Perform this action with the objects needed to determine its scope.
+
+        `engine` is the scope this action is being performed in.
+
+        `entity` is the object performing the action.
+
+        This method must be overwritten by Action subclasses.
+        """
+        raise NotImplementedError()
 
 
 class EscapeAction(Action):
-    pass
+    def perform(self, engine: Engine, entity: Entity) -> None:
+        raise SystemExit()
 
 
 class MovementAction(Action):
@@ -12,3 +30,14 @@ class MovementAction(Action):
 
         self.dx = dx
         self.dy = dy
+
+    def perform(self, engine: Engine, entity: Entity) -> None:
+        dest_x = entity.x + self.dx
+        dest_y = entity.y + self.dy
+
+        if not engine.game_map.in_bounds(dest_x, dest_y):
+            return # Destination is out of bounds
+        if not engine.game_map.tiles["walkable"][dest_x, dest_y]:
+            return # Destination is blocked by a tile.
+
+        entity.move(self.dx, self.dy);

engine.py

@@ -3,15 +3,22 @@ from typing import Set, Iterable, Any
 from tcod.context import Context
 from tcod.console import Console
 
-from actions import EscapeAction, MovementAction
 from entity import Entity
+from game_map import GameMap
 from input_handlers import EventHandler
 
 
 class Engine:
-    def __init__(self, entities: Set[Entity], event_handler: EventHandler, player: Entity):
+    def __init__(
+        self,
+        entities: Set[Entity],
+        event_handler: EventHandler,
+        game_map: GameMap,
+        player: Entity
+    ):
         self.entities = entities
         self.event_handler = event_handler
+        self.game_map = game_map
         self.player = player
 
     def handle_events(self, events: Iterable[Any]) -> None:
@@ -21,12 +28,11 @@ class Engine:
             if action is None:
                 continue
 
-            if isinstance(action, MovementAction):
+            action.perform(self, self.player)
-                self.player.move(dx=action.dx, dy=action.dy)
-            elif isinstance(action, EscapeAction):
-                raise SystemExit()
 
     def render(self, console: Console, context: Context) -> None:
+        self.game_map.render(console)
+
         for entity in self.entities:
             console.print(entity.x, entity.y, entity.char, fg=entity.color)
 

main.py

@@ -3,6 +3,7 @@ import tcod
 
 from engine import Engine
 from entity import Entity
+from game_map import GameMap
 from input_handlers import EventHandler
 
 
@@ -10,6 +11,9 @@ def main() -> None:
     screen_width = 80
     screen_height = 50
 
+    map_width = 80
+    map_height = 50
+
     tileset = tcod.tileset.load_tilesheet(
         "dejavu10x10_gs_tc.png",
         32,
@@ -23,7 +27,9 @@ def main() -> None:
     npc = Entity(int(screen_width / 2 - 5), int(screen_height / 2), "@", (255, 255, 0))
     entities = {npc, player}
 
-    engine = Engine(entities, event_handler, player)
+    game_map = GameMap(map_width, map_height)
+
+    engine = Engine(entities, event_handler, game_map, player)
 
     with tcod.context.new_terminal(
         screen_width,