# Annulus

Creates a fixtured Annulus structure.

## Annulus Inputs

Parameter | Description
Image | This argument must reference a spreadsheet cell that contains a valid Image data structure. By default, the cell referenced is cell A1, containing the Image data structure.
Fixture | Specifies the image coordinate system in which the annulus is defined.
X | The X-offset of the image.
Y | The Y-offset of the image.
Theta | Rotation from image X-axis.
Annulus | Specifies the size and position of the annulus.
X | The X-offset, in fixture coordinates.
Y | The Y-offset, in fixture coordinates.
Inner Radius | The inner radius.
Outer Radius | The outer radius.
Note: The Fixture and Annulus parameters must be defined within the bounds of the image. Otherwise, the function returns #ERR.
Show | Specifies the display mode for the annulus graphic overlay on the image.
0 = hide all | The annulus structure graphic is not be displayed unless the cell containing the Annulus function is highlighted in the spreadsheet.
2 = input graphics only | The annulus structure graphic is always displayed.

## Annulus Outputs

Returns | An Annulus data structure, or #ERR if any of the input parameters are invalid.
Results | When Annulus is initially inserted into a cell, a result table is created in the spreadsheet with the following Structures Vision Data Access functions
Label | Function | Description
X | GetX(Annulus) | The X-offset of the center of the annulus, in image coordinates.
Y | GetY(Annulus) | The Y-offset of the center of the annulus, in image coordinates.
Inner Radius | GetRadius(Annulus, 0) | The inner radius of the indexed annulus.
Outer Radius | GetRadius(Annulus, 1) | The outer radius of the indexed annulus.