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Fixation events sending
=======================
Observers are attached to pipeline steps to be notified when a method is called.
## observers.py
For this use case we need to enable [Ivy bus communication](https://gitlab.com/ivybus/ivy-python/) to log ArUco detection results (on *ArUcoCamera.on_watch* call) and fixation identification with AOI matching (on *ArUcoCamera.on_look* call).
```python
import logging
from argaze import DataFeatures, GazeFeatures
from ivy.std_api import *
from ivy.ivy import IvyIllegalStateError
class IvyBus(DataFeatures.PipelineStepObject):
"""Handle Ivy bus."""
@DataFeatures.PipelineStepInit
def __init__(self, **kwargs):
self.__bus = None
@property
def bus(self) -> str:
return self.__bus
@bus.setter
def bus(self, bus: str):
self.__bus = bus
@DataFeatures.PipelineStepEnter
def __enter__(self, parent = None):
# Enable Ivy bus
IvyInit(self.name)
IvyStart(self.__bus)
return self
@DataFeatures.PipelineStepExit
def __exit__(self, exception_type, exception_value, exception_traceback):
# Stop Ivy bus
IvyStop()
class ArUcoCameraLogger(DataFeatures.PipelineStepObject):
"""Log ArUcoCamera activity."""
@DataFeatures.PipelineStepInit
def __init__(self, **kwargs):
self._last_markers_number = None
def on_watch(self, timestamp, aruco_camera, exception):
"""Report ArUco markers detection info on Ivy bus."""
# Wait for number of detected marker changes
if aruco_camera.aruco_detector.detected_markers_number() != self._last_markers_number:
self._last_markers_number = aruco_camera.aruco_detector.detected_markers_number()
output = f'ArUcoDetection MarkersNumber={self._last_markers_number}'
# Send Ivy message
IvySendMsg(output)
logging.debug('%i %s', timestamp, output)
def on_look(self, timestamp, aruco_camera, exception):
"""Report fixation and metrics on Ivy bus."""
# Select 'Main' layer
main_layer = aruco_camera.layers['Main']
if GazeFeatures.is_fixation(aruco_camera.last_gaze_movement()):
fixation = aruco_camera.last_gaze_movement()
# Output in progress fixation data
if not fixation.is_finished():
output = f'FixationInProgress Start={fixation[0].timestamp} Duration={fixation.duration} AOI={main_layer.last_looked_aoi_name()} Probabilities={main_layer.aoi_matcher.looked_probabilities()}'
# Send Ivy message
IvySendMsg(output)
logging.debug('%i %s %s %s', timestamp, aruco_camera.last_gaze_position().value, aruco_camera.name, output)
# Output finished fixation data
else:
output = f'FixationEnd Start={fixation[0].timestamp} Duration={fixation.duration} AOI={main_layer.aoi_matcher.looked_aoi_name()} Probabilities={main_layer.aoi_matcher.looked_probabilities()}'
# Send Ivy message
IvySendMsg(output)
logging.debug('%i %s %s %s', timestamp, aruco_camera.last_gaze_position().value, aruco_camera.name, output)
```
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