5. Making and Inserting a simple BlockA blockis one or more objects combined to create asingle object. Blocks help you reuse objects in the samedrawing orin other drawings.fastenerblockinstancesoffastener
5. Making and Inserting a simple Block • A block is one or more objects combined to create a single object. Blocks help you reuse objects in the same drawing or in other drawings
How Blocks Are Stored and ReferencedEverydrawing filehas an invisibledata areacalledtheblock definitiontable.Theblock definition table storesall block definitions.It is these blockdefinitions that arereferenced when you insert blocks in your drawingThe following illustrations are conceptual representations of threedrawing files. Each rectangle represents a separate drawing file and isdivided into twoparts: the smallerpartrepresentsthe block definition table,and the larger part represents the objects ina drawing区区emptydrawingdrawingdefinitionblockreferencesfilewithblockinsertedinstoredinblocktabletabledrawing areaWhen you insert a block, you are inserting a block reference.Theinformation is not simply copied from the block definition to the drawingarea.Instead, a link is established between theblockreferenceand the blockdefinition.Therefore,if the block definition is changed, all referencesareupdated automatically
How Blocks Are Stored and Referenced Every drawing file has an invisible data area called the block definition table. The block definition table stores all block definitions. It is these block definitions that are referenced when you insert blocks in your drawing. The following illustrations are conceptual representations of three drawing files. Each rectangle represents a separate drawing file and is divided into two parts: the smaller part represents the block definition table, and the larger part represents the objects in a drawing. When you insert a block, you are inserting a block reference. The information is not simply copied from the block definition to the drawing area. Instead, a link is established between the block reference and the block definition. Therefore, if the block definition is changed, all references are updated automatically