Backing and Overlay Sheets

2D drafting can be used to create backing and overlay sheets, or can be used to annotate overlay sheets that exist as VIEW elements. The example illustrates the relevant part of the Draw database hierarchy.

A BACK (backing sheet template) element can be used as a frame sheet and can contain frame lines and authorisation boxes. These exist as (member) NOTE elements.

OVER (overlay sheet template) elements can also own NOTEs as well as VIEW elements, and can be used to overlay graphic details. For example, keyplans on drawing sheets. An OVER shares many of the attributes of a SHEE.

Sheet Note (NOTE) elements exist to own the 2D drafting elements themselves. Refer to The Drafting Elements for further information. NOTEs can be used to ‘group’ drafting elements together - changes to the NOTE’s position and orientation affects all of its member drafting elements. As well as the basic attributes of XYPS (2D Sheet position), ADEG (orientation) and LVIS (visibility), NOTEs/VNOTs have a set of attributes that are used to store defaults values that are cascaded down to their members. These are:

The first three are cascaded to geometric primitives and the others to text primitives.

View Note (VNOT) elements are similar to NOTEs, the only difference being that VNOTs can be positioned using 3D Design World coordinates or on a Design item, p-point or p-line (or using 2D Sheet coordinates).

Having created a NOTE or VNOT in accordance with the hierarchy, drafting elements can be created and manipulated as desired. Refer to The Drafting Elements for further information.