Created
January 10, 2019 17:06
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Gaze contingent animation using an Eyelink
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| import sys | |
| import random | |
| import time | |
| import pygame | |
| import pylink | |
| class Shape: | |
| def __init__(self, x, y, size, px_per_second): | |
| self.color = (0, 0, 255) | |
| self.size = size | |
| self.pos = [x, y] | |
| self.old_pos_1 = [] | |
| self.old_pos_2 = [x, y] | |
| self.d_x = random.choice([1, -1]) | |
| self.d_y = random.choice([1, -1]) | |
| self.px_per_second = px_per_second | |
| def update(self): | |
| self.old_pos_1.append([self.pos[0], self.pos[1]]) | |
| if self.pos[0] < 0: | |
| self.pos[0] = 0 | |
| self.d_x *= -1 | |
| self.old_pos_1.append([self.pos[0], self.pos[1]]) | |
| if self.pos[0] > task.width - self.size[0]: | |
| self.pos[0] = task.width - self.size[0] | |
| self.d_x *= -1 | |
| self.old_pos_1.append([self.pos[0], self.pos[1]]) | |
| if self.pos[1] < 0: | |
| self.pos[1] = 0 | |
| self.d_y *= -1 | |
| self.old_pos_1.append([self.pos[0], self.pos[1]]) | |
| if self.pos[1] > task.height - self.size[1]: | |
| self.pos[1] = task.height - self.size[1] | |
| self.d_y *= -1 | |
| self.old_pos_1.append([self.pos[0], self.pos[1]]) | |
| for _obj in task.obj_list: | |
| if (task.objs_too_close(_obj.pos, _obj.size, self.pos, self.size) | |
| and _obj != self): | |
| if self.pos[0] < _obj.pos[0]: | |
| self.d_x = -1 | |
| _obj.d_x = 1 | |
| else: | |
| self.d_x = 1 | |
| _obj.d_x = -1 | |
| if self.pos[1] < _obj.pos[1]: | |
| self.d_y = -1 | |
| _obj.d_y = 1 | |
| else: | |
| self.d_y = 1 | |
| _obj.d_y = -1 | |
| _obj.old_pos_1.append([_obj.pos[0], _obj.pos[1]]) | |
| _obj.pos[0] += ((_obj.px_per_second*_obj.d_x)* | |
| (task.ms_from_last_frame/1000.0)) | |
| _obj.pos[1] += ((_obj.px_per_second*_obj.d_y)* | |
| (task.ms_from_last_frame/1000.0)) | |
| self.pos[0] += ((self.px_per_second*self.d_x)* | |
| (task.ms_from_last_frame/1000.0)) | |
| self.pos[1] += ((self.px_per_second*self.d_y)* | |
| (task.ms_from_last_frame/1000.0)) | |
| self.old_pos_1.append([self.pos[0], self.pos[1]]) | |
| if self.pos[0] == self.old_pos_2[0]: | |
| self.old_pos_1.append([self.pos[0], self.pos[1]]) | |
| self.pos[0] += ((self.px_per_second*(self.d_x*(-1)))* | |
| (task.ms_from_last_frame/1000.0)) | |
| self.pos[1] += ((self.px_per_second*(self.d_y*(-1)))* | |
| (task.ms_from_last_frame/1000.0)) | |
| self.old_pos_2 = [self.pos[0], self.pos[1]] | |
| def draw(self): | |
| _x, _y = self.pos | |
| _width, _height = self.size | |
| _rect_list = [] | |
| for _pos in self.old_pos_1: | |
| _rect_list.append(pygame.Rect(_pos[0], _pos[1], _width, _height)) | |
| _big_dirty_rect = _rect_list[0].unionall(_rect_list) | |
| _big_dirty_rect.inflate_ip(task.obj_min_dist, task.obj_min_dist) | |
| task.dirty_rects.append(_big_dirty_rect) | |
| pygame.draw.rect(task.screen, self.color, (_x, _y, _width, _height)) | |
| self.old_pos_1 = [] | |
| class VisualSearchTask: | |
| def __init__(self, display): | |
| pygame.init() | |
| self.max_fps = 60 | |
| self.clock = pygame.time.Clock() | |
| self.px_per_second = 60 | |
| self.bg_color = (255, 255, 255) | |
| self.obj_size = (70, 70) | |
| self.obj_min_dist = 0; | |
| self.dirty_rects = [] | |
| self.obj_list = [] | |
| self.screen = display | |
| self.screen.fill(self.bg_color) | |
| pygame.display.update() | |
| self.width = self.screen.get_size()[0] | |
| self.height = self.screen.get_size()[1] | |
| def get_gaze_pos(self): | |
| _dt = pylink.getEYELINK().getNewestSample() | |
| if(_dt != None): | |
| try: | |
| _pos = _dt.getRightEye().getGaze() | |
| except: | |
| _pos = _dt.getLeftEye().getGaze() | |
| else: | |
| _pos = ["NA", "NA"] | |
| return _pos | |
| def animation_loop(self): | |
| while 1: | |
| self.ms_from_last_frame = self.clock.tick(self.max_fps) | |
| pygame.display.update(self.dirty_rects) | |
| self.dirty_rects = [] | |
| pygame.draw.rect(task.screen, task.bg_color, | |
| (0, 0, self.width, self.height)) | |
| for _obj in self.obj_list: | |
| _obj.update() | |
| _obj.draw() | |
| _dt = pylink.getEYELINK().getNewestSample() | |
| _gaze_position = self.get_gaze_pos() | |
| _gaze_rect = pygame.Rect(_gaze_position[0]-15, | |
| _gaze_position[1]-15, 30, 30) | |
| for _obj in self.obj_list: | |
| _obj_rect = pygame.Rect(_obj.pos[0], _obj.pos[1], | |
| _obj.size[0], _obj.size[1]) | |
| if _gaze_rect.colliderect(_obj_rect): | |
| _obj.color = (255, 0, 0) | |
| else: | |
| _obj.color = (0, 0, 255) | |
| for event in pygame.event.get(): | |
| if (event.type == pygame.KEYDOWN and | |
| event.key == pygame.K_q): | |
| pygame.quit() | |
| def objs_too_close(self, pos_1, size_1, pos_2, size_2): | |
| _rect_1 = pygame.Rect(pos_1[0], pos_1[1], size_1[0], size_1[1]) | |
| _rect_2 = pygame.Rect(pos_2[0], pos_2[1], size_2[0], size_2[1]) | |
| _rect_1.inflate_ip(self.obj_min_dist, self.obj_min_dist) | |
| _rect_2.inflate_ip(self.obj_min_dist, self.obj_min_dist) | |
| if _rect_1.colliderect(_rect_2): | |
| return True | |
| else: | |
| return False | |
| def create_and_place_objs(self, n_obj): | |
| _obj_pos_list = [(self.width/2-self.obj_size[0]/2, | |
| self.height/2-self.obj_size[1]/2)] | |
| _n_obj = n_obj | |
| for _obj in range(1, _n_obj + 1): | |
| _flag = True | |
| while _flag: | |
| _flag = False | |
| _x = random.randrange(self.obj_size[0], | |
| self.width+1-self.obj_size[0]*2) | |
| _y = random.randrange(self.obj_size[1], | |
| self.height+1-self.obj_size[1]*2) | |
| _pos = (_x, _y) | |
| for _other_pos in _obj_pos_list: | |
| if self.objs_too_close(_pos, self.obj_size, | |
| _other_pos, self.obj_size): | |
| _flag = True | |
| _obj_pos_list.append((_x, _y)) | |
| self.obj_list.append(Shape(_x, _y, self.obj_size, | |
| self.px_per_second)) | |
| class Display: | |
| def __init__(self, width, height): | |
| self.width = width | |
| self.height = height | |
| def setup_display(self): | |
| pygame.display.init() | |
| self.screen = pygame.display.set_mode((self.width, self.height), | |
| pygame.FULLSCREEN) | |
| pygame.mouse.set_visible(False) | |
| class EyeTracker: | |
| def __init__(self, display): | |
| self.screen = display | |
| def setup_tracker(self, edf_file): | |
| self.edf_file = edf_file | |
| self.EYELINK = pylink.EyeLink() | |
| pylink.openGraphics() | |
| self.EYELINK.openDataFile(self.edf_file) | |
| pylink.flushGetkeyQueue() | |
| pylink.getEYELINK().setOfflineMode() | |
| self.surface = pygame.display.get_surface() | |
| pylink.getEYELINK().sendCommand("screen_pixel_coords = 0 0 %d %d" | |
| %(self.surface.get_rect().w - 1, | |
| self.surface.get_rect().h - 1)) | |
| pylink.getEYELINK().sendMessage("DISPLAY_COORDS 0 0 %d %d" | |
| %(self.surface.get_rect().w - 1, | |
| self.surface.get_rect().h - 1)) | |
| if self.EYELINK.getTrackerVersion() == 2: | |
| pylink.getEYELINK().sendCommand("select_parser_configuration 0") | |
| else: | |
| pylink.getEYELINK().sendCommand("saccade_velocity_threshold = 35") | |
| pylink.getEYELINK().sendCommand("saccade_acceleration_threshold=\ | |
| 9500") | |
| self.EYELINK.setFileEventFilter("LEFT,RIGHT,FIXATION,SACCADE,BLINK,\ | |
| MESSAGE,BUTTON") | |
| self.EYELINK.setFileSampleFilter("LEFT,RIGHT,GAZE,AREA,GAZERES,\ | |
| STATUS") | |
| self.EYELINK.setLinkEventFilter("LEFT,RIGHT,FIXATION,SACCADE,BLINK,\ | |
| BUTTON") | |
| self.EYELINK.setLinkSampleFilter("LEFT,RIGHT,GAZE,GAZERES,AREA,\ | |
| STATUS") | |
| pylink.getEYELINK().sendCommand("button_function 5\ | |
| 'accept_target_fixation'") | |
| pylink.setCalibrationColors((0, 0, 0), (251, 251, 251)) | |
| pylink.setTargetSize(int(self.surface.get_rect().w/70), | |
| int(self.surface.get_rect().w/300)) | |
| pylink.setCalibrationSounds("", "", "") | |
| pylink.setDriftCorrectSounds("", "off", "off") | |
| def quit(self): | |
| pylink.getEYELINK().setOfflineMode() | |
| pylink.msecDelay(500) | |
| self.EYELINK.closeDataFile() | |
| self.EYELINK.receiveDataFile(self.edf_file, self.edf_file) | |
| self.EYELINK.close() | |
| pylink.closeGraphics() | |
| if __name__ == "__main__": | |
| display = Display(0, 0) | |
| display.setup_display() | |
| et = EyeTracker(display.screen) | |
| et.setup_tracker("test.edf") | |
| pylink.getEYELINK().doTrackerSetup() | |
| et.EYELINK.startRecording(1, 1, 1, 1) | |
| pylink.beginRealTimeMode(100) | |
| task = VisualSearchTask(display.screen) | |
| task.create_and_place_objs(10) | |
| task.animation_loop() | |
| pylink.endRealTimeMode() | |
| pylink.getEYELINK().stopRecording() | |
| et.quit() |
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