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47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
5 years ago
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import threading
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import time
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import random
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class GameLoop():
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"""Implements a loop that calls tick every 1/fps
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tick gets called with the time delta to the last call as parameter
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if fixed_dt is True the tick function gets called with 1/fps
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"""
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def __init__(self, fps=1, tick=None, fixed_dt=False, args=None):
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self.fps = fps
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self.tick = tick if tick is not None else self.default_tick
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self.args = args or tuple()
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self.fixed_dt = fixed_dt
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self.running = False
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self.last_frame_time = time.time()
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self.thread = threading.Thread(target=self.loop)
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def loop(self):
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while self.running:
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current_time = time.time()
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dt = current_time - self.last_frame_time
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self.last_frame_time = current_time
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if self.fixed_dt:
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self.tick(1 / self.fps, *self.args)
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else:
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self.tick(dt, *self.args)
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sleep_time = (1 / self.fps) - (time.time() - self.last_frame_time)
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if sleep_time > 0:
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time.sleep(sleep_time)
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def start(self):
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self.running = True
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self.thread.start()
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def stop(self):
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self.running = False
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def default_tick(self, dt):
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print('ticked. Last tick was %.2f seconds ago' % dt)
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time.sleep(random.choice([0.4, 0.5, 0.6, 1.4, 2.1]) * 1/self.fps)
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