mine implementation

units/__init__.py

@@ -6,3 +6,4 @@ from .unit import Unit
 from .rat import Rat, Male, Female
 from .bomb import Bomb, Timer, Explosion
 from .points import Point
+from .mine import Mine

units/mine.py

@@ -0,0 +1,59 @@
+from .unit import Unit
+from .bomb import Explosion
+class Mine(Unit):
+    def __init__(self, game, position=(0,0), id=None):
+        super().__init__(game, position, id)
+        self.speed = 1.0  # Mine doesn't move but needs speed for consistency
+        self.armed = True  # Mine is active and ready to explode
+
+    def move(self):
+        """Mines don't move, but we need to check for collision with rats each frame."""
+        pass
+        
+    def collisions(self):
+        """Check if a rat steps on the mine (has position_before on mine's position)."""
+        if not self.armed:
+            return
+            
+        # Check for rats that have position_before on this mine's position
+        for rat_unit in self.game.unit_positions_before.get(self.position, []):
+            if hasattr(rat_unit, 'sex'):  # Check if it's a rat (rats have sex attribute)
+                # Mine explodes and kills the rat
+                self.explode(rat_unit)
+                break
+                
+    def explode(self, victim_rat):
+        """Mine explodes, killing the rat and destroying itself."""
+        if not self.armed:
+            return
+            
+        print("MINE EXPLOSION!")
+        self.game.render_engine.play_sound("BOMB.WAV")
+
+        # Kill the rat that stepped on the mine
+        if victim_rat.id in self.game.units:
+            victim_rat.die(score=5)
+        
+        # Remove the mine from the game
+        self.die()
+        
+    def draw(self):
+        """Draw the mine using the mine asset."""
+        if not self.armed:
+            return
+            
+        # Use mine asset
+        image = self.game.assets["mine"]
+        image_size = self.game.render_engine.get_image_size(image)
+        
+        # Center the mine in the cell
+        x_pos = self.position[0] * self.game.cell_size + (self.game.cell_size - image_size[0]) // 2
+        y_pos = self.position[1] * self.game.cell_size + (self.game.cell_size - image_size[1]) // 2
+        
+        self.game.render_engine.draw_image(x_pos, y_pos, image, anchor="nw", tag="unit")
+        
+    def die(self, score=None):
+        """Remove mine from game and disarm it."""
+        self.armed = False
+        Explosion(self.game, self.position).draw()
+        super().die(score)