feat(sim): projectiles, items and inventory

game/sim/items.py

@@ -0,0 +1,51 @@
+from ..constants import tileSize
+from .geometry import Aabb
+
+itemDefs = {
+    "coin": {"score": 100, "size": 12, "bob": True},
+    "gem": {"score": 500, "size": 12, "bob": True},
+    "key": {"score": 50, "size": 12, "bob": False},
+    "heart": {"score": 0, "size": 14, "bob": True, "heal": 2},
+}
+
+
+class Collectible:
+    def __init__(self, kind, x, y):
+        self.kind = kind
+        self.x = float(x)
+        self.y = float(y)
+        self.collected = False
+        definition = itemDefs.get(kind, itemDefs["coin"])
+        self.size = definition["size"]
+        self.score = definition["score"]
+        self.heal = definition.get("heal", 0)
+        self.bob = definition.get("bob", False)
+        self.bobPhase = 0.0
+
+    @property
+    def aabb(self):
+        pad = (tileSize - self.size) * 0.5
+        return Aabb(self.x + pad, self.y + pad, self.size, self.size)
+
+    def update(self):
+        if self.bob:
+            self.bobPhase = (self.bobPhase + 0.15) % 6.2831853
+
+    def collect(self, player, world):
+        if self.collected:
+            return
+        self.collected = True
+        player.score += self.score
+        world.score += self.score
+        if self.kind == "coin":
+            player.coins += 1
+            world.coins += 1
+        elif self.heal:
+            player.heal(self.heal)
+        player.inventory.add(self.kind)
+        world.playSound("pickup", self.x)
+        world.spawnBurst("pickup", self.x + tileSize * 0.5, self.y + tileSize * 0.5, 5)
+
+    @classmethod
+    def fromSpawn(cls, spawn):
+        return cls(spawn.kind, spawn.x, spawn.y)