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point
)
(command "._insert" ; Issues the INSERT command
sym ; using the desired symbol
p1 siz siz 0) ; insertion point, and size
; Hide the custom toolbar named Symsize
(command "._-toolbar" "SymSize" "_hide")
(princ) ; Exits quietly
)
NOTE
An AutoLISP routine that you use regularly should include error checking to
verify the validity of user input.
The DIESEL expressions in the following example multiply the current value
of DIMSCALE by the specified value, and return an appropriate scale factor.
This cannot be done with similar AutoLISP code; a value returned by an
AutoLISP expression cannot typically be used as a response to a getxxx function
call (such as, the getreal function in the preceding sample).
$M=$(*,$(getvar,dimscale),0.375)
$M=$(*,$(getvar,dimscale),0.5)
$M=$(*,$(getvar,dimscale),0.625)
DIESEL expressions can also return string values to pull-down menu item
labels, so that you can make menus unavailable or otherwise alter the way
they are displayed. To use a DIESEL expression in a pull-down menu label,
make sure that the first character is the $ character.
In the next example, the current layer is set to BASE and the following DIESEL
expression is used as the label.
$(eval,"Current layer: " $(getvar,clayer))
The result is that the appropriate pull-down menu is displayed and updated
whenever the current layer changes.
Current Layer: BASE
You can also use this method to interactively change the text displayed in a
pull-down menu. You use an AutoLISP routine that sets the USERS1-5 system
variables to the selected text, which can be retrieved by a DIESEL macro in a
menu label.
DIESEL Expressions in Macros | 65