Block Definition

Block definition objects are collections of various drawn Entities so that they can be referenced (drawn as a copy) more than once. For example, if the user frequently created drawings with a particular design of door, s/he could make a block (or stamp) of door and add it to Block Library using Block Creation Tool, and insert it whenever his/her drawing called for it. Each door would look exactly like the others and would give the drawing a consistent appearance.

A block definition object consists of the following data:

Property Name	Data Type	Description
Name	Text	Name of block definition.
Xref Dependent	Boolean	Shows whether this block definition is dependent on External Reference.
Xref Resolved	Boolean	Shows whether the external reference is resolved or not.
Uniform Scaling	Boolean	If checked (true), allows only uniform scaling to be applied to Bock Reference Entities created from this block definition.
Explodable	Boolean	If checked (true), allows exploding, using Explode Block Tool, of block reference entities created from this block definition.
Has Preview Icon	Boolean	Shows whether this block definition has preview or not.
Is Anonymous	Boolean	Shows whether this block definition is anonymous.
From External Reference	Boolean	Shows whether this block definition was created from external reference.
From Overlay Reference	Boolean	Shows whether this block definition was created from overlay reference.
Is Layout	Boolean	Shows if this block definition is a Layout.
Is Unloaded	Boolean	Shows if this block definition is unloaded.
Reference Count	Integer Number	Number of block reference entities existing in current drawing that are created from this block definition.
Origin	3D Point	Origin point for this block definition.
Path Name	Text	Path to external reference file.
Block Insert Units	Multi-option selection box	Scientific Units associated with block reference entities created from this block definition.
Comments	Text	Any comments or description text for this block definition.
Layout	Text	Name of layout this block definition is associated with.

To add a new block definition to drawing's Block Library: