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1、Chapter 10 Using Block and External References 10.1 OverviewAutoCAD provides several features to help you manage objects in your drawings. With blocks you can organize and manipulate many objects as one component. You can also associate items of information with the blocks in your drawings- for exam
2、ple, part numbers and prices - by attaching attributes. Specification sheets or bills of materials can be created using this information.You can attach or overlay entire drawings in your current drawing by using AutoCAD external references, or xrefs. When you open a drawing that contains xrefs, any
3、changes that have been made in the referenced drawing appear in the current drawing. 10.2 Working with BlocksA block is a collection of objects you can associate together to form a single object, or block definition. You can insert, scale, and rotate a block in a drawing. You can explode a block int
4、o its component objects, modify them, and redefine the block. AutoCAD updates all current and future instances of that block based on the block definition.Blocks streamline the drawing process. For example, you can use blocks toBuild a standard library of frequently used symbols, components, or stan
5、dard parts. You can insert the same block numerous times instead of re-creating the drawing elements each time.Revise drawings efficiently by inserting, relocating, and copying blocks as components rather than individual geometric objects.Save disk space by storing all references to the same block a
6、s one block definition in the drawing database.For information about how to create a block, see Defining Blocks.When you insert a block in your drawing, you are creating a block instance. Each time you insert a block instance, you assign a scale factor and rotation angle to the inserted block. You c
7、an also scale a block instance using different values in any coordinate (X, Y, Z) direction. Blocks make it possible for you to organize your drawing tasks in a systematic way, so that you can set up, redesign, and sort the objects in your drawings and the information associated with them. Defining
8、BlocksYou can group objects to create block definitions in the current drawing, or you can save the block as a separate drawing file. When you define a block, you specify the base point, the objects to group, and whether to retain or delete the objects or convert them to a block in the current drawi
9、ng. You can also enter a text description and specify an icon used to help identify the block definition in AutoCAD DesignCenter. Block definitions are one of many nongraphical objects saved in a drawing. See Working with Named Objects.To create a block definition1From the Draw menu, choose Block Ma
10、ke.2In the Block Definition dialog box, enter a name for the block.3Under Objects, choose the Select Objects button to use the pointing device to select objects for the block definition.The dialog box closes temporarily while you select objects for the block. Press ENTER when you are done selecting
11、blocks. The dialog box reopens.4If you want to create a selection set, use the Quick Select button to create or define a filter for your selection set. See Filtering Selection Sets.5Under Objects, specify whether to retain, convert to a block, or delete the selected objects.Retain: Keeps selected ob
12、jects in the current drawing, in their original state.Convert to Block: Replaces selected objects with an instance of the block.Delete: Removes selected objects after the block is defined.6Under Base Point, enter the coordinate values for the insertion base point or choose the Specify Insertion Base
13、 Point button to use the pointing device.7Under Description, enter text to help identify the block for easy retrieval. 8Under Icon, specify whether to create an icon from the block definition.Do not include an icon: Omits preview image from block definition.Create icon from block geometry: Saves pre
14、view image with the block definition.9Choose OK. The block definition is saved in the current drawing.To save a block or object as a separate drawing file1At the Command prompt, enter wblock.2In the Write Block dialog box, specify a block or an object to write out as a file.Block: Specifies a block
15、to save as a file.Entire Drawing: Selects current drawing as a block.Object: Specifies objects to be saved as a file.3Under Block, select a name from the list to save as a file.4Under Base Point, use the Pick Point button to define the base point.5Under Objects, use the Select objects button to sele
16、ct the object for the block file.6Enter a name for the new file.If a block is selected, WBLOCK automatically uses that blocks name for the new file.7In the Insert Units list, select an insert unit to use in AutoCAD DesignCenter.8Choose OK.The block definition is saved as a drawing file.Inserting Blocks
