The ShapeField class provides the common attributes for the shape fields on the form. A shape field is for decoration only and does not typically have a variable associated with it. However, you can associate the field with a variable using the field function to set some of the visible attributes of the field at runtime. The variable itself has no meaning.

All shape fields are in the shape layer of the form, which is always displayed behind all fields in the field layer. Shapes can also be transparent (other fields cannot).