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- AUTOCAD LISP LINE TRANSPARENCY HOW TO
- AUTOCAD LISP LINE TRANSPARENCY UPDATE
- AUTOCAD LISP LINE TRANSPARENCY CODE
Open the drawing BLOX.DWG and load the function. (prompt “\nA block name was not entered.”) NEWELIST (subst NEWBLOCKNAMELIST OLDBLOCKNAMELIST OLDELIST)
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NEWBLOCKNAME (getstring “New block name: “) (setq ENT (car (entsel “Select block to replace: “)) See also Converting Lists to Strings Using an External File with autolisp in AutoCAD Estimated time for completion: 10 minutes. See the Appendix for more information about working with subentities.Ĭreate a function, CHANGEBLOCK.LSP, that will enable you to replace one block with another user-designated block. It may be used with any entity, and simply causes that entity to be regenerated.
AUTOCAD LISP LINE TRANSPARENCY UPDATE
vertex of a pline or attribute of a block), an additional step is required to update the drawing by using the (entupd) function: ( entupd ename) The (entupd) function causes the modified pline or block with name ename to be updated on the screen. The (entmod) function updates the drawing database for the entity whose name is specified by the “-1” DXF code, or entity name, in ename. It is also necessary to update the drawing database, using the (entmod) function, to reflect changes made in the entity definition list. Simply changing the entity definition list does not change the entity in the drawing. “WALLS”) Command: (setq NEWENT1 (subst NEWLAY OLDLAY ELIST1)) “0”) Command: (setq NEWLAY (cons 8 “WALLS”)) (8. If old_item is not found, (subst) returns list unchanged.įor example, if we wanted to change the layer in our entity definition list, ELIST1, from its existing layer to WALLS:Ĭommand: (setq OLDLAY (assoc 8 ELIST1)) (8.
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If found, it replaces every occurrence of old_ item with new_item and returns a new list with the changes made. The (subst) function searches the list for old_ item. To switch association pairs we will need to use a new command, the (subst) function. See also Extracting Elements from a List with autolisp in AutoCAD Substituting one Association Pair for Another Command: (cdr (cons 8 “WALLS”)) “WALLS” But, when a list is its argument, the (cdr) function returns the second element as a list. The (cdr) function, when a dotted pair is its argument, returns the second element as an element, not a list. This is the only way to create a dotted pair.įor example, if we wanted to create a new association pair that represented the layer WALLS: The (cons) function creates a new list by adding new_first_element to the beginning of list.įor example, if we wanted to create a new association pair that represented the start point of a line, where PT1 is (1.0 1.0 0.0) and 10 is the DXF code:īut, the ( cons) function will create a dotted pair if the second argument is an atom instead of a list.
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To add information to a list, we use the (cons) function.Įxplanation: the (cons) function with DXF codes
AUTOCAD LISP LINE TRANSPARENCY CODE
To create a new association pair we must connect the DXF code with the proper information. But, there is an old AutoLISP adage that states, “Real programmers don’t use the (command) function!”įirst we need to create new association pairs, then substitute one association pair for another, and finally update the object in the drawing database. We could just continue to call AutoCAD’s CHANGE command using the (command) function to change the properties of an object.
AUTOCAD LISP LINE TRANSPARENCY HOW TO
Now we will examine how to change DXF code data. In the previous section we looked at methods that allows us to use DXF code data.