screen_check.py

import PIL
import time
import numpy as np
import pyscreenshot as scr

# TODOs:
# - [ ] ctypes.windll.InpOut32 for LPT trigger
# - [ ] activate only on blank to non-blank change
# - [ ] 
state = False
box = (1650, 280, 1800, 440)

elapsed = 0.
prev_time = time.time()
step_time = list()
while elapsed < 35:
	im = np.array(scr.grab(bbox=box))
	current_state = np.all(im == im[1,1,:])
	if current_state != state:
		print 'change!'
		print elapsed
		state = current_state
	current_time = time.time()
	time_diff = current_time - prev_time
	prev_time = current_time
	step_time.append(time_diff)
	elapsed += time_diff
step_time = np.array(step_time)
print 'mean step time: ', np.mean(step_time)
print 'max step time: ', np.max(step_time)
print 'min step time: ', np.min(step_time)

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