linewidth - Get the equivalent width in plot area

[tonitpp]

I would like to know the equivalent width in plot area. LineWidth for XYCursor is in pixels but what is the same width in plot area? I want to substract and add this value to xycursor.XPosition.

[tonitpp]

EDIT: Units of XYCursor.LineWidth are inches? pixels? how to convert to the same units as XYCursor.XPosition in order to either add or substract?

[tonitpp]

EDIT: I think I need to convert XYCursor.LineWidth to Data Coordinates as XYCursor.XPosition is in data coordinates and I need to subract/add them. So how to convert to data coordinates? Using DataConverter? How?