Attribute of Tag index

This reporter retrieves a selected attribute of an AprilTag detected at the specified index.

The available attributes include:

1. id – A unique integer (e.g., 0, 1, 2…) embedded within the black-and-white grid of the tag
2. x position – x coordinate of the centre of AprilTag. Coordinates are in stage units in 480 px space ranging from  -240 to 240. 
3. y position –  y coordinate of the centre of AprilTag. Coordinates are in stage units in 360 px space ranging from  -180 to 180. 
4. width – It refers to the box width of AprilTag. 
5. height – It refers to the box height of AprilTag
6. rotation (deg) – It refers to the number of degrees rotated in any direction. Positive rotation angle value for anti-clockwise rotation and negative angle rotation for clockwise rotation. 
7. confidence – It refers to the accuracy of the detection and depends on the pose settings and the camera input. 
8. 3D position x (cm) – x coordinate position in centimeters of the centre of the AprilTag relative to the centre of camera
9. 3D position y (cm) – y coordinate position in centimeters of the centre of the AprilTag relative to the centre of camera
10. 3D position z (cm) – z coordinate position in centimeters of the centre of the AprilTag relative to the centre of camera
11. yaw (deg) – It indicates how far the camera is rotated left/right from facing the tag directly. It represents the rotation about the z-axis.
12. pitch(deg) – It indicates the vertical tilt of the camera (up/down) relative to the tag. It represents the rotation about the horizontal (X) axis. 
13. roll(deg)- It indicates the tilt of the camera sideways. It represents the rotation about the forward-pointing (Y) axis. 

For the 2D rotation value:

• Positive value → Anti-clockwise rotation
• Negative value → Clockwise rotation