def take_best_picture_ever(self, machine_cfg):
machine_key = machine_cfg.display_name
self.camera.rotation = machine_cfg.photo_rotation
last_photoshoot = None
if os.path.isfile(
path_last_config.format(self.app_config.root_path,
machine_key)):
with open(
path_last_config.format(self.app_config.root_path,
machine_key), 'r') as content_file:
j = json.loads(content_file.read())
last_photoshoot = PictureConfig(j["shutter_speed"],
j["brightness"], j["delta"])
current = None
last = None
checkpoint = None
closest = None
ss = 2 if last_photoshoot is None else last_photoshoot.shutter_speed
self.last_count = 0
tested_under = False
tested_over = False
self.last_stopped_reason = "unknown"
while ss > 0 and ss <= machine_cfg.max_ss and self.last_count < machine_cfg.max_try and (
current is None or current.delta > machine_cfg.accepted_delta):
self.last_count += 1
try:
current = TakenPicture(ss, self.take_picture_stream(int(ss)),
machine_cfg)
Console.WriteLine("br={0} accepted_delta={2} curr_delta={1}",
current.brightness, current.delta,
machine_cfg.accepted_delta)
if current.brightness < machine_cfg.ideal_brightness:
Console.DebugLine("UNDER: CHECK")
tested_under = True
if current.brightness > machine_cfg.ideal_brightness:
Console.DebugLine("OVER: CHECK")
tested_over = True
if closest is None or current.delta < closest.delta:
Console.DebugLine("CLOSEST YET")
closest = current
if current.delta < machine_cfg.accepted_delta:
Console.DebugLine("OK ! FINISH")
self.last_stopped_reason = "accepted"
break
if ss == machine_cfg.max_ss and current.brightness < machine_cfg.ideal_brightness:
Console.DebugLine("EXPLODE")
self.last_stopped_reason = "max_ss"
break
if ss == 1 and current.brightness > machine_cfg.ideal_brightness:
self.last_stopped_reason = "min_ss"
Console.DebugLine("DIE")
break
if not tested_over:
checkpoint = current
multiplier = min(10, max(2, current.delta / 10))
Console.DebugLine("EXCESSIVE PUSH * {0}, CP = CUR",
multiplier)
ss *= multiplier
elif not tested_under:
checkpoint = current
divider = min(10, max(2, current.delta / 10))
Console.DebugLine("EXCESSIVE CALM DOWN / {0}, CP = CUR",
divider)
ss /= divider
else:
if ss > last.shutter_speed and current.brightness > machine_cfg.ideal_brightness:
Console.DebugLine("CP = LAST")
checkpoint = last
elif ss < last.shutter_speed and current.brightness < machine_cfg.ideal_brightness:
Console.DebugLine("CP = LAST")
checkpoint = last
pct = 100 * current.delta / \
(current.delta + checkpoint.delta)
diff_ss = abs(ss - checkpoint.shutter_speed)
if current.brightness > machine_cfg.ideal_brightness:
Console.DebugLine(
"CONCENTRATE BACKWARD {0:.04f}% of {1}", pct,
diff_ss)
ss -= pct * (diff_ss) / 100
else:
Console.DebugLine(
"CONCENTRATE FORWARD {0:.04f}% of {1}", pct,
diff_ss)
ss += pct * (diff_ss) / 100
if self.last_count == machine_cfg.max_try:
Console.DebugLine("ENOUGH")
self.last_stopped_reason = "max_tries"
break
if ss > machine_cfg.max_ss:
Console.DebugLine("JUST BELOW EXPLOSION")
ss = machine_cfg.max_ss
if ss < 1:
Console.DebugLine("JUST ABOVE DEATH")
ss = 1
if int(ss) == int(current.shutter_speed):
self.last_stopped_reason = "closest"
break
last = current
current = None
except Exception as inst:
Console.WriteLine("")
print("Unexpected error:", sys.exc_info()[0])
print(type(inst)) # the exception instance
print(inst.args) # arguments stored in .args
print(inst)
traceback.print_exc()
break
current.img.seek(0)
cfg = open(
path_last_config.format(self.app_config.root_path, machine_key),
"w")
cfg.write(
json.dumps(
{
'shutter_speed': current.shutter_speed,
'brightness': current.brightness,
'delta': current.delta,
'stopped_reason': self.last_stopped_reason
},
sort_keys=True,
indent=4,
separators=(',', ': ')))
cfg.close()
return current
