added changes from code submission branch and coin entity

marl_factory_grid/modules/coins/entitites.py

@@ -0,0 +1,46 @@
+from marl_factory_grid.environment.entity.entity import Entity
+from marl_factory_grid.utils.utility_classes import RenderEntity
+from marl_factory_grid.modules.coins import constants as d
+
+
+class CoinPile(Entity):
+
+    @property
+    def amount(self):
+        """
+        Internal Usage
+        """
+        return self._amount
+
+    @property
+    def encoding(self):
+        return self._amount
+
+    def __init__(self, *args, amount=2, max_local_amount=5, **kwargs):
+        """
+        Represents a pile of coins at a specific position in the environment that agents can interact with. Agents can
+        clean the dirt pile or, depending on activated rules, interact with it in different ways.
+
+        :param amount: The amount of coins in the pile.
+        :type amount: float
+
+        :param max_local_amount: The maximum amount of dirt allowed in a single pile at one position.
+        :type max_local_amount: float
+        """
+        super(CoinPile, self).__init__(*args, **kwargs)
+        self._amount = amount
+        self.max_local_amount = max_local_amount
+
+    def set_new_amount(self, amount):
+        """
+        Internal Usage
+        """
+        self._amount = min(amount, self.max_local_amount)
+
+    def summarize_state(self):
+        state_dict = super().summarize_state()
+        state_dict.update(amount=float(self.amount))
+        return state_dict
+
+    def render(self):
+        return RenderEntity(d.COIN, self.pos, min(0.15 + self.amount, 1.5), 'scale')