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from sys import stderr
from time import time
class FrameCounter:
"""Creates a main loop and ensures that the framerate is static"""
def __init__(self, canvas, target_fps):
"""Initialise the frame counter
:param canvas: The canvas which to call after on
:param target_fps: The fps to aim to achieve
"""
self.canvas = canvas
self.fps = target_fps
self.frame_time = 1 / target_fps
self.last_frame = time()
self.current_fps = 1
def next_frame(self, callback):
"""Calculate when the next frame should be called
:param callback: function to call for the next frame
"""
t = time()
ft = t - self.last_frame
delay = 0
if ft > self.frame_time:
if ft - self.frame_time > self.frame_time / 5:
print(
f"Help! Running {ft - self.frame_time} seconds behind!",
file=stderr)
else:
delay = self.frame_time - ft
self.canvas.after(int(delay*1000), callback)
self.current_fps = 1 / (delay+ft)
self.last_frame = t
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