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---
title: AOI matching
---
AOI matching
============
Once AOI3D scene is projected into a frame as AOI2D scene, it could be needed to know which AOI2D is looked.
The AOI class in [AOIFeatures](/argaze/#argaze.AreaOfInterest.AOIFeatures) provides two ways to accomplish such task.
## Pointer-based matching
Test if 2D pointer is inside or not AOI using contains_point() method as illustrated below.
``` python
pointer = (x, y)
for name, aoi in aoi2D_scene.items():
if aoi.contains_point(pointer):
# Do something with looked aoi
...
```
It is also possible to get where a pointer is looking inside an AOI provided that AOI is a rectangular plane:
``` python
inner_x, inner_y = aoi.inner_axis(pointer)
```
## Circle-based matching
As positions have limited accuracy, it is possible to define a radius around a pointer to test circle intersection with AOI.
``` python
intersection_shape, intersection_aoi_ratio, intersection_circle_ratio = aoi.circle_intersection(pointer, radius)
```
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