feat(sim): tile grid and static entity base

game/sim/entity.py

@@ -0,0 +1,58 @@
+import itertools
+
+from .geometry import Aabb
+
+_idCounter = itertools.count(1)
+
+
+class Actor:
+    def __init__(self, x, y, w, h):
+        self.id = next(_idCounter)
+        self.x = float(x)
+        self.y = float(y)
+        self.w = float(w)
+        self.h = float(h)
+        self.vx = 0.0
+        self.vy = 0.0
+        self.facing = 1
+        self.onGround = False
+        self.onCeiling = False
+        self.onWallLeft = False
+        self.onWallRight = False
+        self.groundPlatform = None
+        self.alive = True
+        self.removed = False
+
+    @property
+    def aabb(self):
+        return Aabb(self.x, self.y, self.w, self.h)
+
+    @property
+    def centerX(self):
+        return self.x + self.w * 0.5
+
+    @property
+    def centerY(self):
+        return self.y + self.h * 0.5
+
+    @property
+    def left(self):
+        return self.x
+
+    @property
+    def right(self):
+        return self.x + self.w
+
+    @property
+    def top(self):
+        return self.y
+
+    @property
+    def bottom(self):
+        return self.y + self.h
+
+    def hurtBox(self):
+        return self.aabb
+
+    def kill(self):
+        self.alive = False