def __init__(self, display, logfile=LOGFILE, eventdetection=EVENTDETECTION, \
saccade_velocity_threshold=35, saccade_acceleration_threshold=9500, \
**args):
"""Initializes the EyeTribeTracker object
arguments
display -- a pygaze.display.Display instance
keyword arguments
logfile -- logfile name (string value); note that this is the
name for the eye data log file (default = LOGFILE)
"""
# try to copy docstrings (but ignore it if it fails, as we do
# not need it for actual functioning of the code)
try:
copy_docstr(BaseEyeTracker, EyeTribeTracker)
except:
# we're not even going to show a warning, since the copied
# docstring is useful for code editors; these load the docs
# in a non-verbose manner, so warning messages would be lost
pass
# object properties
self.disp = display
self.screen = Screen()
self.dispsize = DISPSIZE # display size in pixels
self.screensize = SCREENSIZE # display size in cm
self.kb = Keyboard(keylist=['space', 'escape', 'q'], timeout=1)
self.errorbeep = Sound(osc='saw',freq=100, length=100)
# output file properties
self.outputfile = logfile
# eye tracker properties
self.connected = False
self.recording = False
self.errdist = 2 # degrees; maximal error for drift correction
self.pxerrdist = 30 # initial error in pixels
self.maxtries = 100 # number of samples obtained before giving up (for obtaining accuracy and tracker distance information, as well as starting or stopping recording)
self.prevsample = (-1,-1)
self.prevps = -1
# event detection properties
self.fixtresh = 1.5 # degrees; maximal distance from fixation start (if gaze wanders beyond this, fixation has stopped)
self.fixtimetresh = 100 # milliseconds; amount of time gaze has to linger within self.fixtresh to be marked as a fixation
self.spdtresh = saccade_velocity_threshold # degrees per second; saccade velocity threshold
self.accthresh = saccade_acceleration_threshold # degrees per second**2; saccade acceleration threshold
self.eventdetection = eventdetection
self.set_detection_type(self.eventdetection)
self.weightdist = 10 # weighted distance, used for determining whether a movement is due to measurement error (1 is ok, higher is more conservative and will result in only larger saccades to be detected)
# connect to the tracker
self.eyetribe = EyeTribe(logfilename=logfile)
# get info on the sample rate
self.samplerate = self.eyetribe._samplefreq
self.sampletime = 1000.0 * self.eyetribe._intsampletime
# initiation report
self.log("pygaze initiation report start")
self.log("display resolution: %sx%s" % (self.dispsize[0],self.dispsize[1]))
self.log("display size in cm: %sx%s" % (self.screensize[0],self.screensize[1]))
self.log("samplerate: %.2f Hz" % self.samplerate)
self.log("sampletime: %.2f ms" % self.sampletime)
self.log("fixation threshold: %s degrees" % self.fixtresh)
self.log("speed threshold: %s degrees/second" % self.spdtresh)
self.log("acceleration threshold: %s degrees/second**2" % self.accthresh)
self.log("pygaze initiation report end")
)
# INIT
elif "Initialize EyeTribe" in message:
# get the file name
try:
# (message: "Initialize EyeTribe; logfilename=%s")
logfilename = message[message.find('logfilename=') + 12:]
except:
print(
"WARNING in Initialize EyeTribe: invalid logfilename, using default"
)
logfilename = None
# initialize the EyeTribe
try:
tracker = EyeTribe(logfilename=logfilename)
conn.send('success')
print("Initialize EyeTribe: success!")
except:
print(
"ERROR in Initialize EyeTribe: could not initialize new EyeTribe object."
)
conn.send(
"ERROR in Initialize EyeTribe: could not initialize new EyeTribe object."
)
# CALIBRATE
elif message == "Calibration start":
# check if there is an initialized tracker yet
if tracker == None:
print('ERROR in Calibration start: tracker was not initialized.')
# screen stuff
RESOLUTION = (1280, 1024)
BGC = (0, 0, 0)
# files and paths
DIR = os.path.dirname(os.path.abspath(__file__))
LOGFILE = os.path.join(DIR, 'example_data.txt')
IMGDIR = os.path.join(DIR, 'imgs')
IMGNAMES = os.listdir(IMGDIR)
# # # # #
# PREPARE
# start communications with the EyeTribe tracker
tracker = EyeTribe(logfilename=LOGFILE)
# initialize PyGame
pygame.init()
# create a new display
disp = pygame.display.set_mode(RESOLUTION, pygame.FULLSCREEN)
# compile a list of images
images = {}
for filename in IMGNAMES:
# check if the extension is a JPEG image
if os.path.splitext(filename)[1] == '.jpg':
# load the image, and add to the image dict
images[filename] = pygame.image.load(os.path.join(IMGDIR, filename))
