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Edit and execute context
========================
The [utils.contexts module](../../argaze.md/#argaze.utils.contexts) provides ready-made contexts like:
* [Tobii Pro Glasses 2](context_modules/tobii_pro_glasses_2.md) live stream and post processing contexts,
* [Pupil Labs](context_modules/pupil_labs.md) live stream context,
* [OpenCV](context_modules/opencv.md) window cursor position and movie processing,
* [Random](context_modules/random.md) gaze position generator.
## Edit JSON configuration
Here is a JSON configuration that loads a [Random.GazePositionGenerator](../../argaze.md/#argaze.utils.contexts.Random.GazePositionGenerator) context:
```json
{
"argaze.utils.contexts.Random.GazePositionGenerator": {
"name": "Random gaze position generator",
"range": [1280, 720],
"pipeline": {
"argaze.ArFeatures.ArFrame": {
"size": [1280, 720]
}
}
}
}
```
Let's understand the meaning of each JSON entry.
### argaze.utils.contexts.Random.GazePositionGenerator
The class name of the object being loaded from the [utils.contexts module](../../argaze.md/#argaze.utils.contexts).
### *name*
The name of the [ArContext](../../argaze.md/#argaze.ArFeatures.ArContext). Basically useful for visualization purposes.
### *range*
The range of the gaze position being generated. This property is specific to the [Random.GazePositionGenerator](../../argaze.md/#argaze.utils.contexts.Random.GazePositionGenerator) class.
### *pipeline*
A minimal gaze processing pipeline that only draws last gaze position.
## Context execution
A context can be loaded from a JSON configuration file using the [*load* command](../utils/main_commands.md).
```shell
python -m argaze load CONFIGURATION
```
This command should open a GUI window with a random yellow dot inside.
!!! note ""
At this point, it is possible to load any ready-made context from [utils.contexts](../../argaze.md/#argaze.utils.contexts) module.
However, the incoming gaze positions are not processed and gaze mapping would not be available for head-mounted eye tracker context.
Read the [gaze analysis pipeline section](../gaze_analysis_pipeline/introduction.md) to learn how to process gaze positions then, the [ArUco markers pipeline section](../aruco_marker_pipeline/introduction.md) to learn how to enable gaze mapping with an ArUco markers setup.
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