Better time handling: configurable ticks per second, and no dropped movement.

Note: the original method involves moving on only when update() is called, which is called only between frames. Hence less than the ticks per second setting if it can't paint as fast. This made movement completely FPS independent.

TODO: remove update, merge into on_draw.

punyverse/__main__.py

@@ -3,13 +3,20 @@ INITIAL_WIN_HEIGHT = 540
 INITIAL_WIN_WIDTH = 700
 WIN_TITLE = "Punyverse"
 
+
 def main():
+    import argparse
+    parser = argparse.ArgumentParser(prog='punyverse', description='Python simulator of a puny universe.')
+    parser.add_argument('-t', '--ticks', help='Ticks per second for game, more means more responsive, but '
+                        ' may run slower, default is 20.', default=20, type=int)
+    args = parser.parse_args()
+
     import pyglet
-    from punyverse.game import Applet
-
+    from punyverse import game
     pyglet.options['shadow_window'] = False
+    game.TICKS_PER_SECOND = args.ticks
 
-    Applet(width=INITIAL_WIN_WIDTH, height=INITIAL_WIN_HEIGHT, caption=WIN_TITLE, resizable=True, vsync=0)
+    game.Applet(width=INITIAL_WIN_WIDTH, height=INITIAL_WIN_HEIGHT, caption=WIN_TITLE, resizable=True, vsync=0)
     pyglet.app.run()
 
 

punyverse/game.py

@@ -47,10 +47,10 @@ class Applet(pyglet.window.Window):
             if key.S in self.keys:
                 cam.roll -= 4
             if self.moving:
-                cam.move(self.speed)
+                cam.move(int(self.speed * dt * TICKS_PER_SECOND + 0.5))
 
         if self.running:
-            self.world.tick += self.tick
+            self.world.tick += int(self.tick * dt * TICKS_PER_SECOND + 0.5)
             for entity in self.world.tracker:
                 entity.update()
 
@@ -73,8 +73,8 @@ class Applet(pyglet.window.Window):
         self.atmosphere = True
         self.cloud = not texture.badcard
 
-        self.tick = self.world.tick_length
-        self.ticks = [20, 40, 60,                             # Second range
+        self.tick = self.world.tick_length / TICKS_PER_SECOND
+        self.ticks = [1, 2, 5, 10, 20, 40, 60,                # Second range
                       120, 300, 600, 1200, 1800, 2700, 3600,  # Minute range
                       7200, 14400, 21600, 43200, 86400,       # Hour range
                       172800, 432000, 604800,                 # 2, 5, 7 days
@@ -83,7 +83,8 @@ class Applet(pyglet.window.Window):
                       63072000, 157680000, 315360000,         # 2, 5, 10 years
                       630720000, 1576800000, 3153600000,      # 20, 50, 100 years
         ]
-        self.ticks = [i / 20 for i in self.ticks]
+        self.ticks = [i / TICKS_PER_SECOND for i in self.ticks]
+        self.ticks = sorted(set(i for i in self.ticks if i))
         self.__time_per_second_cache = None
         self.__time_per_second_value = None
 

punyverse/world.json

@@ -11,7 +11,7 @@
     "model": "used to load a wavefront object instead of a textured sphere"
   },
   "au": 10000,
-  "tick": 180,
+  "tick": 3600,
   "length": 63.7,
   "bodies": {
     "sun": {