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Gaze position
=============
[GazeFeatures](/argaze/#argaze.GazeFeatures) defines a [GazePosition](/argaze/#argaze.GazeFeatures.GazePosition) class to handle point coordinates with a precision value.
``` python
from argaze import GazeFeatures
# Define a basic gaze position
gaze_position = GazeFeatures.GazePosition((123, 456))
# Define a gaze position with a precision value
gaze_position = GazeFeatures.GazePosition((789, 765), precision=10)
# Access to gaze position value and precision
print(f'position: {gaze_position.value}')
print(f'precision: {gaze_position.precision}')
```
## Validity
[GazeFeatures](/argaze/#argaze.GazeFeatures) defines also a [UnvalidGazePosition](/argaze/#argaze.GazeFeatures.UnvalidGazePosition) class that inherits from [GazePosition](/argaze/#argaze.GazeFeatures.GazePosition) to handle case where no gaze position exists because of any specific device reason.
``` python
from argaze import GazeFeatures
# Define a basic unvalid gaze position
gaze_position = GazeFeatures.UnvalidGazePosition()
# Define a basic unvalid gaze position with a message value
gaze_position = GazeFeatures.UnvalidGazePosition("Something bad happened")
# Access to gaze position validity
print(f'validity: {gaze_position.valid}')
```
## Distance
[GazePosition](/argaze/#argaze.GazeFeatures.GazePosition) class provides a **distance** method to calculate the distance to another gaze position instance.
``` python
# Distance between A and B positions
d = gaze_position_A.distance(gaze_position_B)
```
## Overlapping
[GazePosition](/argaze/#argaze.GazeFeatures.GazePosition) class provides an **overlap** method to test if a gaze position overlaps another one considering their precisions.
``` python
# Check that A overlaps B
if gaze_position_A.overlap(gaze_position_B):
# Do something if A overlaps B
...
# Check that A overlaps B and B overlaps A
if gaze_position_A.overlap(gaze_position_B, both=True):
# Do something if A overlaps B AND B overlaps A
...
```
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