AutoCAD Block 02

6.4. Decomposition of 3 blocks

1. Decomposition method of block

In AutoCAD, two methods can be used to decompose a block:

(1) Select the Explode (explode) item when inserting the block.

(2) Invoke the "explode" command to decompose.

The reader should be reminded that no matter which decomposition method is used, the object being decomposed is just a reference to the block. The definition of the block is still stored in the graphics file and can be referenced at any time. If the user wishes to delete the definition of the block, you can use the "purge" command, which is detailed in chapter 16th 16.4, for a specific use of the "purge" command.

2. Decomposition result of block

For a block reference that is scaled by a uniform scale, it can be decomposed into the original object that made up the block. For block references that are not consistent in scaling, unpredictable results occur when you decompose.

If the block also contains blocks (nested blocks) or other composite objects such as multiple lines, the decomposition can only be decomposed one layer, after the decomposition of nested blocks or multiple lines will still retain their block attributes or multi-line characteristics.

Note Blocks inserted with Minsert (see 6.4.4), external references, and blocks of external reference dependencies cannot be decomposed. The body, three-dimensional entity, and the entity in the uneven scaling block cannot be decomposed. See chapter 13th for external references.

6.4.4 block nesting and multiple inserts

1. Nesting of blocks

The object that the user selects when defining a block can also be a block, and other blocks can be nested within the selected block object, that is, the definition of the block can include multiple layers of nesting. There is no limit to the number of layers in a nested block, but you cannot use the name of the nested block as the name of the new block that you want to define, that is, the block definition cannot nest itself.

2. Multiple insertion of blocks (Minsert)

The "Minsert" command is provided in AutoCAD to insert multiple references to a block in a rectangular array. The only difference between blocks inserted using this command and blocks inserted with the Insert command is that the former cannot be decomposed.

The command is invoked in the following way:

Command line: Minsert

The "Minsert" command is performed in conjunction with the "-insert" command and the "-array" command. For example, in "EXAM6-2.DWG", do the following:

Command:minsert Enter	Invoke the "Minsert" command
Enter block name or [?] < Sign_point>: Enter	Select a block named "Sign_point"
Specify insertion point or [scale/x/y/z/rotate/pscale/px/py/pz/protate]:
	Specify a point in the plot area as the insertion point
Enter X scale factor, specify opposite corner, or [corner/xyz] <1>: Enter
	Specify an x scale factor of 1
Enter Y scale factor <use X scale factor>: Enter	Specify a y scale factor of 1
Specify rotation angle <0>: Enter	Specify a rotation angle of 0
Enter number of rows (---) <1>: 5 Enter	Specifies that the array row count is 5
Enter Number of columns (| | |) <1>: 5 Enter	Specify the number of array columns to be 5
Enter distance between rows or specify unit cell (---): 5 Enter	Specify the distance between rows is 5
Specify distance between columns (| | |): 5 Enter	Specify the distance between columns is 5

Draw the results as shown in Figure 6-23.