Adds an obstacle system

Throot.py

@@ -0,0 +1,68 @@
+import time
+import thumby
+import math
+
+import Games.Throot.map
+import Games.Throot.sprites
+from Games.Throot.artrepository import OBSTACLES
+
+from random import randrange
+
+import thumby
+
+from Games.Throot.map import ObstacleSlice, OBSTACLE_SLICES
+from Games.Throot.sprites import update_entities
+
+class GameLoop:
+    def __init__(self):
+        self.current_depth = 0
+        self.diving_velocity = 10
+        self.diving_accel = 0
+        self.current_obstacle_slice = OBSTACLE_SLICES[0]
+        self.entities = set()
+
+    def get_obstacle_slice(self):
+        return OBSTACLE_SLICES[randrange(0, len(OBSTACLE_SLICES))]
+
+    def update(self, tpf):
+        """
+        Executes one tick of the game
+        """
+        prev_depth = self.current_depth
+        self.diving_velocity += self.diving_accel * tpf
+        self.current_depth += self.diving_velocity * tpf
+
+        if self.current_depth % ObstacleSlice.height < prev_depth % ObstacleSlice.height:
+            self.current_obstacle_slice = self.get_obstacle_slice()
+
+        # Generate new entities as needed
+        self.entities |= update_entities(self.current_obstacle_slice, self.current_depth, prev_depth)
+
+        # Updates the entities
+        to_remove = set()
+        for entity in self.entities:
+            if not entity.update(tpf, self.current_depth, prev_depth):
+                to_remove.add(entity)
+        self.entities -= to_remove
+
+        thumby.display.fill(0)
+        # Draw the entities
+        for entity in self.entities:
+            entity.render(tpf, self.current_depth, prev_depth)
+        thumby.display.update()
+
+def main():
+    # Set the FPS (without this call, the default fps is 30)
+    thumby.display.setFPS(60)
+
+    print("Starting game loop")
+    loop = GameLoop()
+
+    prev_time = 0
+    while True:
+        t0 = time.ticks_ms()
+        tps = (t0 - prev_time) / 1000
+        loop.update(tps)
+        prev_time = t0
+
+main()