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Describe 2D AOI
================
Once [ArFrame](../../argaze.md/#argaze.ArFeatures.ArFrame) is [configured](configuration_and_execution.md), areas of interest need to be described to know what is looked in frame.
According common computer graphics coordinates convention, all AOI need to be described from a top left frame corner origin with a coordinate system where:
* +X is pointing to the right,
* +Y is pointing to the downward.
!!! warning
All AOI spatial values must be given in **pixels**.
### Edit SVG file description
SVG file format could be exported from most vector graphics editors.
``` xml
<svg>
<path id="Triangle" d="M1288.1,189.466L1991.24,3399.34L584.958,3399.34L1288.1,189.466Z"/>
<rect id="BlueRectangle" x="1257" y="1905.18" width="604.169" height="988.564"/>
<rect id="RedSquare" x="623.609" y="658.357" width="803.15" height="803.577"/>
<circle id="GreenCircle" cx="675.77" cy="2163.5" r="393.109"/>
<circle id="PinkCircle" cx="1902.02" cy="879.316" r="195.313"/>
</svg>
```
Here are common SVG file features needed to describe AOI:
* *id* attribute indicates AOI name.
* *path* element describes any polygon using only [M, L and Z path intructions](https://www.w3.org/TR/SVG2/paths.html#PathData)
* *rect* and *circle* allow respectively to describe rectangular and circle AOI.
### Edit JSON file description
JSON file format allows to describe AOI.
``` json
{
"Triangle" : [[1288.1, 189.466], [1991.24, 3399.34], [584.958, 3399.34]],
"BlueRectangle": {
"Rectangle": {
"x": 1257,
"y": 1905.18,
"width": 604.169,
"height": 988.564
}
},
"RedSquare": {
"Rectangle": {
"x": 623.609,
"y": 658.357,
"width": 803.15,
"height": 803.15
}
},
"GreenCircle": {
"Circle": {
"cx": 675.77,
"cy": 2163.5,
"radius": 393.109
}
},
"PinkCircle": {
"Circle": {
"cx": 1902.02,
"cy": 879.316,
"radius": 195.313
}
}
}
```
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