feat(sim): projectiles, items and inventory

game/sim/projectile.py

@@ -0,0 +1,32 @@
+from .. import constants
+from .entity import Actor
+from . import physics
+
+
+class Projectile(Actor):
+    def __init__(self, x, y, vx, vy, owner="enemy", damage=1):
+        super().__init__(x, y, 6, 6)
+        self.vx = vx
+        self.vy = vy
+        self.owner = owner
+        self.damage = damage
+        self.life = constants.projectileLife
+        self.gravityScale = 0.0
+
+    def update(self, world):
+        self.life -= 1
+        if self.life <= 0:
+            self.alive = False
+            return
+        if self.gravityScale:
+            self.vy += constants.gravity * self.gravityScale
+        self.x += self.vx
+        self.y += self.vy
+        box = self.aabb
+        for tileBox in physics.solidTilesOverlapping(world.level, box):
+            if box.intersects(tileBox):
+                self.alive = False
+                world.spawnBurst("spark", self.centerX, self.centerY, 4)
+                return
+        if self.centerX < -32 or self.centerX > world.level.pixelWidth() + 32:
+            self.alive = False