AutoLisp Quick Start
This tutorial is aimed at the
AutoCAD users who would like to start learning AutoLisp.
I suggest that you go through this tutorial along with the AutoCAD
Programmers Reference Guide. You can then lookup the relevant AutoLisp
commands for a more detailed explanation. Hope this helps you and Good
Luck in your Lisping - Kenny Ramage
PRINCIPLES OF PROGRAMMING
All AutoLisp programs must contain the
suffix LSP otherwise AutoCAD will not access them when loading. (eg.
CHTEXT.LSP).
Use a simple text processor such as Notepad to create and edit your lisp
files.
FUNCTION
(Which is simply the program)
Is a pre-defined set of instructions that
describes a set of actions that
AutoLisp is to perform, divided into three sections
:
- OPERATOR - Getting input.
- ARGUMENT - Manipulating the input.
- COMMAND - Using the manipulated input.
CHARTING
Draw out or write out in English what you
want your program to do.
VARIABLES
These are like empty boxes in which to
store data, to be used later. In
AutoLisp, variables may be a collection of letters or numbers as long as
they begin with the letters.
Example of legal variables are as follows :
An AutoLisp variable may contain more than
one value in a single variable. A value can be anything, such as :
- Real number
- String
- Integer
- Pickset
Therefore a variable can store just about
anything.
STRUCTURING
Structure your program in such a way that
it is easy to understand, by yourself and everyone else. e.g. Keep input
statements together. Keep your arguments together. Keep your commands
together. Track your work with the semicolon. When you begin a line with a
semicolon, anything you write after will be ignored by AutoLisp. It is
used for documentation and explanation of your program. Write notes about
your program, what you are doing and what the variables are. A semicolon
does not have to begin the line.
(prompt "This line will print");
This is a comment
From where the semicolon begins, the
remainder of the line is a comment statement.
PARENTHESES ( )
Parentheses are vital to writing AutoLisp
programs. All commands are surrounded by parentheses. AutoLisp uses
parentheses to nest, allowing you to write a command that acts on
(evaluates) another command. In turn, that command can act on another. As
you add parentheses, you're nesting commands become deeper and deeper.
Remember to come out of the nest with an equal number of parentheses.
NOTE: Always close what you open.
THE DEFUN COMMAND
In AutoLisp the name of the program or
function must be defined in the first statement, which is done by using
the command
DEFUN.
Defun is the first actual command and is
followed by the name of the function (or program). There are different
ways of starting a function for example :
- (Defun drawline ()
- (Defun drawline (/ pntl pnt2)
- (Defun C:drawline ()
- (Defun C:drawline (/ pntl pnt2)
- (Defun drawline (a / pntl pnt2)
The first way, you are saying that all
variables you plan to use in the program are GLOBAL, which are variables
that do not lose their value after the program ends.
The second way, you are saying that the
variables you are using are LOCAL variables, which are variables that have
value only for that program and while that program is running.
The third way, as the first BUT the C:
tells AutoCAD to treat that function as any other AutoCAD command.
The fourth way, as the second, but an
AutoCAD command.
The last, variable a
receives the first value to it from outside the program.
DATA TYPES
Integers
- Is a number ranging between -32768 and +32767 without
decimal points eg: 1
Reals
- Is a number with a decimal point eg: 1.0
Strings
- Strings can be up to a maximum length of 100 characters.
Lists
- A list is a variable that has more than one element.
A point in your drawing is described by the value of the X co-ordinate and
the value of the Y co-ordinate. In AutoLisp, that point can be described
by a single variable, a list of two elements, the first being the X value
and the second being the Y value eg :
- ( 7 10 )
- ( 5 9 7 2 )
- (1.5 2.3 4.9 )
Atoms
- If a variable has only one value it is an atom e.g.
6
The Type command - will return the
data type of variable.
Input Commands
-(Getting info from the user)
- getpoint -
Needs you to pick a point on the screen.
- getint -
Needs a Integer eg: 1
- getreal -
Needs a real number eg: 10.00
- getcorner -
Needs a second point on the screen and draws an elastic window from a
previous point.
- getstring -
Needs a string of text.
- getdist -
Needs a value either by picking on the screen or a number from the
keyboard.
- getangle -
Needs an angle either by pointing on the screen or by typing an angle,
which will be returned in radians.
- getkword -
Needs a keyword from the user.
- getvar -
Will get the value of an AutoCAD system variable.
- initget -
Establishes various options for use by the next GET XXX function.
- getorient -
Is similar to the GETANGLE but is affected by the zero-degree base and
the direction. It will always give you the absolute angle using 0
degree base as EAST.
Input Command Examples
1. (getpoint
"\n Pick POINT on the screen:")
- \n - The n MUST always be lower case, \n
takes you to the next line.
- Your prompt must always be between
" " (Quotes), and after picking a point will return a value
of that point.
2. (getint
"\Enter your age :") Type a number and AutoLisp will
return that number.
3. (getreal
"\nEnter a number:") Type a real number eg 10.51 and
AutoLisp will return that number.
4. (getcorner pntl
"\n Pick second point:") Will create an elastic window
from variable pntl.
5. (getstring 1
"\What is the day today ?:") Type some text and Autolisp
will return that text.
6. (getdist
"\nHow long is the line ?:") Pick two points or type a
length and AutoLisp will return that length.
7. (getangle
"\nWhat is the angle ?:") Pick two points for the angle
or type an angle and AutoLisp will return that angle in radians.
8. (initget
1 "Yes No")
(getkword "\nAre
you going? ("Yes or NO):") Initget will control the next
getxxx function, getkword will accept only one word. The initget will
accept that one word only to be Yes or No.
9. (getvar
"FILLETRAD") Would return the set fillet radius eg : 0. 5
Initget Bits
- 1 Disallow null input
- 2 Disallow zero values
- 4 Disallow negative values
- 8 DO not check limits, even if LIMECHECK
is on.
- 16 Return 3D points rather than 2D
points.
- 32 Use dashed lines when drawing rubber
band or box.
(initget (+ 1 2 4))
(getint
"\nHow old are you?:") Will only accept an Integer eg
: 21
- 11. (getorient
"\nWhat is the angle?:") Pick two points for the
angle or type an angle and AutoLisp will return an angle in radians
relative to 0 degrees at East.
Setq Command
(Set Equal)
(Setq) is an
assignment command, eg : it assigns the value of one variable or constant
to another variable.
NOTE : (Setq)
is the primary assignment command in AutoLisp. The =
is not used as an assignment. = does exist
but only as a non assignment statement. It does not have the ability to
make one variable equal to another. (It is used for a comparison of
variables, numbers or strings)
(setq a b)
This statement assigns the value of b
to the variable a.
NOTE : The first variable after the (setq)
is the one that receives the value.
Print Commands
Prompt
This command is used simply to print a message on the command line. A
line feed (\n) is not included so two
consecutive prompt commands will print both messages on the same line.
Therefore , any printing after the prompt must have the (terpri)
or \n command.
(terpri)
This is a line feed that causes the next
printed text to appear on the next line. It generally follows the prompt
command. eg:
- (prompt
"Hello, how are you ?")(terpri) or
- (prompt "\nHello,
how are you ?")
Prin1
This function prints the expression on the
screen and returns the expression. It can be any expression and need not
only be a string. The expression can also be written to a file and will
appear in the file exactly as it would on the screen.
- (prin1
"Hello") would print Hello
- (prin1 a)
would print the value of variable a
(prin1 a f)
would print the value of variable a to an open
file named in variable f
Princ
Is the same as prinl
except that the control characters ("") are not printed. Can
also be used to print a blank line by using no statement after princ.
Print
Same as prinl
except that a new line is printed before the expression and a space is
printed after the expression. eg:
- (print
"Hello") would return "Hello"
"Hello"
Setvar
This function sets an AutoCAD system
variable to a given value and returns that value. The variable name must
be in double quotes. eg:
- (setvar
"blipmode" 0) returns 0
Will switch blipmode off. 1
would switch it on again.
Doing arithmetic
- (+ 1 1)
returns 2
(- 2 1)
returns 1
(* 2 2)
returns 4
(/ 2 1)
returns 2
(1+ 1)
returns 2 (Incremented)
- (1- 2)
returns 1 (Decremented)
FOR MORE - REFER AUTOLISP PROGRAMMERS
REFERENCE
Polar
This function returns the point at an angle
(in radians) and distance from a point.
Inters
Examines two lines and returns the point
where they intersect even if they do not cross one another.
- (inters pntl pnt2 pnt3
pnt4)
AutoCAD commands in AutoLISP
Any AutoCAD command can be used inside your
lisp program BUT one must remember that they have to be used exactly as
you would in AutoCAD and your RETURN is a double set of Quotes
(""). eg:
(command
"line" pnt1 pnt2 "") This will draw a line from
pntl to pnt2 and
the "" acts as a return to
terminate your line command.
(graphscr) would return you to the graphics
screen while the program is running.
(textscr) would return you to the text
screen while the program is running.
Entities from a list
When you used (setq a
(getpoint)) you assigned the X and Y coordinate numbers to variable
a. That Variable now is a list that may look
like (5 10). If you want to look at the list
in variable a, AutoLISP gives you a
convenient way to do that from the command line.
!a Placing the
! in front of the variable will display the
value or values of the variable.
(car) X COORDINATE (lst element)
The primary command for taking a list
apart, (car) gives you the first element of
the list. If the value of a is a list of:
(5 10)
Then (setq b (car a))
would assign to the variable b the value of
the first element in a which is 5.
(cdr) SECOND AND REMAINING
This is the secondary command for
taking a list apart. (cdr)
gives you the second and remaining elements
of the list. If variable a
is a list of
(2 5 7 9 11)
Then (setq b (cdr a))
would assign to variable b the second and
remaining elements of the list in variable a
(5 7 9 11).
(cadr) Y COORDINATE (2nd element)
This always produces the second element of
a list. Assuming a still has the list (5 10),
Then (setq b (cadr
a)) would produce 10.
(caddr) Z COORDINATE (3rd element)
This always produces the third element of a
list. Assuming a has a list (3 7 5)
Then (setq c (caddr
a)) would produce 5.
This program draws a rectangle by pointing
to two points.
(defun c:retan (/ pl p2 p3
p4)
(setq pl (getpoint
"\nfirst corner of rectangle: "))
(setq p3 (getcorner
"\nsecond corner of rectangle: "))
(setq p2 (list (car
pl)(cadr p3)))
(setq p4 (list (car
p3)(cadr pl)))
(command "line"
pl p2 p3 p4 "c")
(princ)
)
DTR converts degrees to radians.
(defun dtr (a)
(* pi (/ a 180)) )
RTD converts radians to degrees.
(defun rtd (a)
(/ (* a 180) pi) )
Things to strings
strcase (string case)
Changes a string of text from lower case to
upper case, leaving upper case characters as they are. eg:
(strcase
"Hello") returns "HELLO"
(strcase a)
returns the alphabetic characters in variable a
from lower case to upper case.
strcat (string cat)
Returns two or more separate strings as
one. eg:
(strcat "H"
"ello") returns "Hello"
(strcat a b)
returns two strings in variable a & b
as one.
strlen (string length)
Returns the length, of the characters of a
string. eg:
(strlen
"hello") returns 5.
(strlen a)
returns the length of a string in variable a.
substr (substitute string)
Returns a part of a string, from a
specified position, ending either at the end or another specified
position. eg:
(substr "Hello
2) returns "ello".
(substr "Hello 2
1) returns "e".
(substr
"Hello" 3 2) returns "ll".
List Manipulation
The apostrophe '
serves a special function in AutoLISP, for
example if a group of items is preceded by an apostrophe '
it is treated as a list. eg:
'(20 10 5) is
treated as a list.
Angle
Returns an angle between two points in
radians. To use that angle in AutoCAD you have to convert it back to
decimal degrees. eg:
(setq a (angle pntl
pnt2)) sets the angle between pntl and
pnt2 to the variable a.
To use a:
(command
"text" pntl "40" a t) The text command with a
height of 40, rotation angle assigned to variable a
and text to variable t. But a
is not the correct rotation angle because it is in radians.
Append
Takes any number of specified lists and
joins them together as one list. eg:
(append '(10 20) '(30
40)) returns the list: (10 20 30 40).
(append a b)
returns the list in variable a and the list
in variable b as one.
Distance
Measures the distance from two known
points. eg:
(setq distl (distance
pntl pnt2)) returns the distance between pntl
and pnt2 and assigns the distance to a
variable called dist1.
Length
Returns the number of elements in a list.
eg:
(length '(a b c d)) returns
4.
Member
Looks for a duplicate and returns that and
the rest of the list eg:
(member 'c '(a b c d
e)) returns (C D E).
nth
Returns the nth
element in a list, where n is the number of
the element to return. (Zero is the first element). eg:
(nth 3 '(a b c d))
returns d.
Assoc (associative)
Often used with (subst)
command, this command lets you search for a specific element, then assign
that element to a variable.
Lets assume variable b
is the list ((10 5.5 2.7)(40 5)) and you
looking for a code 40. You want to pull out
the entire element and assign it to a variable c.
eg:
(setq c (assoc 40 b))
This assigns the entire element containing
the 40 in the list b
to variable c. Now c
is
a list that looks like this: (40
5).
Subst
(subsitute)
Allows you to substitute one aspect for
another. When substituting ALWAYS substitute the new item for the old in
the list. Now lets substitute 20 for the 5
in the variable c.
(setq bl (subst '(40 20) c
b))
Now bl is the
new list.
'(40 20) is
the new element substituted for the old element (40
5) c, found in list b.
If you want to use a variable which
represents the value.
(setq bl (subst '(40
h) c b)), It looks like it should work, but it does not. The new
element will look like this: (40 h).
(subst) cannot
interpret variables. You need to construct a new variable containing the
entire list element, then use
the new variable in the (subst)
command.
Cons
(Construct)
Constructs a new list with the new element
placed at the begining. Assume variable c contains the following list: (40
5).
Also, assume variable h
contains the real number 20.0 then:
(setq d (cons (car c)
h)) Remember (car c) gives you 40.
Therefore, (car c) is the new first element,
followed by the value h. Thus it produces a
new list d (40 20.0).
Now we substitute:
(setq bl (subst d c
b)) That substitutes the new element found in variable d
for the old element found in variable c. (In
the list found in variable b) and assigns the
new list to bl.
Conversions
Angtos
Takes an angle in radians and converts it
into a string, into a specific format.
Angtos Mode Format :
- 0 Degrees
- 1 Degrees/minutes/seconds
- 2 Grads
- 3 Radians
- 4 Surveyor's units
Assuming variable a has an angle in
radians. eg:
(angtos a 0 0)
returns "180"
(angtos a 0 4)
returns "180.0000"
(angtos a 1 4)
returns "180d0"0""
Fix
This function returns the convention of a
real number to an Integer. eg:
(fix 8)
returns 8
(fix 8.6)
returns 8
Float
This function returns the convention of an
Integer to a real number. (One can use either real or an Integer.) eg:
(float 8)
returns 8.0000
(float 8.6)
returns 8.6000
Ascii
Returns the convention of the first
character of a string into its ASCII character code. (An Integer) eg:
(ascii "a")
returns 65
(ascii
"BLUE") returns 66
Chr
Returns the convention of an Integer
representing an ASCII character code into a single character string. eg:
(chr 65)
returns "A"
(chr 66)
returns "B"
Atof
Returns the convention of a string into a
real number. eg:
(atof
"9.3") returns 9.3000
(atof
"2") returns 2.0000
Rtos
Returns the convention of a real number to
a string into a
specified format.
Rtos Mode Format
- 1 Scientific
- 2 Decimal
- 3 Engineering(feet & decimal inches)
- 4 Architectural(feet & fractional
inches)
- 5 Arbituary fractional units
The real number can be set according to
mode and precision. eg:
(rtos 7.2 1 4)
returns "7.200OE+00"
(rtos 7.2 2 2)
returns "7.20"
Itoa
Returns the convention of an Integer into a
string. eg:
(itoa 25)
returns "25"
Atoi
Returns the convention of a string into an
Integer. eg:
(itoi "25")
returns 25
Conditionals
(=)
Is not an assignment command, only (setq)
is. The (=) command is used only to test if
items are equal. It does not make them equal.
if
(if) is the
standard if-then-else statement. In AutoLISP you may only match one if
statement with a then statement. eg:
(if (= a b) (setq b 5 (setq
b 6))
If a is equal
to b, then b
will be assigned the value of 5.
If it is not then b will be assigned the
value of 6.
Cond
(Conditional)
This function accepts any number of lists
as arguments. It evaluates the first item in each list (in order supplied)
until one of these items are a value other than nil.
eg: A user's response string is variable s,
(cond
((= s "Y") 1)
((= s "y") 1)
((= s "N") 0)
((= s "n") 0)
(t nil)
)
This function tests the response and
returns 1 if it is "Y"
or "y", and 0
if it is "N" or "n",
and nil otherwise.
Repeat
Similar to a loop but repeat will only go
through the commands as many times as is told. eg:
(setq a 10)
(setq b 100)
(repeat 4
(setq a (+ a 10))
(setq b (+ b 10))
Returns 140.
While
Is another loop control command available
in AutoLISP. A loop is necessary
if you want to repeat a command. However, unless you have a way of
controlling it, the program will run forever and hang you up. eg:
(setq a "w")
Sets up the controlling variable to a value
other than nil.
(while a
The loop will continue, begining with the commands
that follow, until the variable a
is set to nil.
(xxxx)
(xxxx) Are the commands that are performed
in the loop.
(if (= c d) (setq a nil))
Evaluates if c
is equal to d, and if so, sets the loop
controlling variable a to
nil to end the loop.
)
While parenthesis closes loop, and program
will continue with the commands after this.
Entities
An entity is the smallest object you can
place on your screen. The following are entities: LINE, CIRCLE, ARC, TEXT,
POLYLINES, etc. Entities are stored and referenced in the drawing
database. They can be changed and manipulated using AutoLISP to suit your
needs. Each entity has a massive definition in AutoCAD's database. eg: The
data for a single line contains the following info:
Entity name, Entity type, Layer, Color,
Beginning X Y coordinate, Ending X Y coordinate, Line type, etc. You can
modify any of the above aspects. An example of an entity list:
( - 1 <Entity name:
60000014) (0 "CIRCLE") (8 . "LAYER1")
(10 . 50.000 100.000) (40 .
60.000)
It is an entity list of a circle on layer
LAYER1, center point relative to 0,0 of 50.0,100.0 , and a radius of 60.0
Ssget and Entsel
(select entities)
Both give you a way of selecting the
entities for the selection set. (entsel) only
selects one entity at a time. You may not use WINDOW or CROSSING to select
entities. (ssget) however lets use WINDOW or
CROSSING as well as other selection techniques. You will mostly be using (ssget).
(setq a (ssget))
will prompt you to select objects. You have now created a selection set
with a specific name, <Selection set:l> , assigned to variable a,
or use filter option (setq
a (ssget "X" '((0 . "TEXT")))) to
search database for certain entities or codes.
Ssname
(get entity name)
Lets you secure the name of the entity. The
name of the entity is realy a hexadecimal number, therefore don't expect
to see a name like LINE, or CIRCLE etc. The name of your entity might be
60000018.
Lets assume variable a
is the selection set and variable i is set to
0. (setq i 0) To
set Counter variable. (setq na (ssname a i))
This assigns na the entity name found in the
selection set a at index number i.
Remember that a selection set may contain more than one entity name. You
can point to each entity by using its relative number in the selection
set. eg: Entity 1 is Index 0 , Entity 2 is Index 1 , etc.
Entget
(get entity list)
This command actually pulls out, or
extracts, the entity list. The entity list can be assigned to a variable. (setq
b (entget na)) That assigns to b the
entire entity list for that entity name.
Subst
(substitute new for old)
Allows you to substitute one aspect for
another. Assume variable b is the name of the
list and variable c contains the value of the
element: (40 . 60.0000) (setq bl (subst '(40 .
30.0000) c b)) ;bl is now the new
list. '(40 . 30.0000) is the new element
substituted for the old element c found in
list b.
Sslength
Gives you the length or number of
selections made.
Entmod
(entity modification)
Gives you the ability to take the newly
modified entity list and write it back to the database to update the
drawing. Now that you have a new list in the variable b1,
you want to make bl the permanent list in
your drawing database. (entmod bl) You should
see the change appear on the screen.
Change Cross Hair Angle
This program permits you to draw lines
perpendicular to other lines. The program measures the angle of the line
chosen, and shifts the SNAP ANGLE to the angle of that line. Use ORTHO ON
and draw perpendicular to your chosen line.
(defun c:perpdon (/ a b
pntl pnt2 angl)
(graphscr)
(setq a (entsel))
(setq b (entget (car a)))
(setq pntl (cdr (assoc 10
b)))
(setq pnt2 (cdr (assoc 11
b)))
(setq angl (angle pntl
pnt2))
(setvar "snapang"
ang1)
(princ)
)
(defun c:perpdoff
(setvar "snapang"
0)
(princ)
)
Erase Screen
Erases everything on the drawing screen. If
you are in a ZOOM ALL position, the program erases everything within the
limits of the drawing.
Note: if you accidentally invoke this
command, you can recover with OOPS.
(defun c:erasescr (/ l u)
(setq l (getvar
"limmin"))
(setq u (getvar
"limmax"))
(command "erase"
"w" l u "")
(princ)
)
Change Layer
Lets you select objects by any selection
method and change their layer. The target layer is chosen by simply
pointing to an object on the desired layer. All objects selected will then
change to that target layer. To test this program, you will need to create
a drawing with objects on different layers.
(defun c:chlayer (/ a1 a2 n
index b1 b2 d1 d2 b3)
(graphscr)
(prompt "\nselect
entities to be changed: ")
(setq a1 (ssget))
(prompt "\npoint to
entity on target layer: ")
(setq a2 (entsel))
(setq n (sslength a1))
(setq index 0)
(setq b2 (entget (car a2)))
(setq d2 (assoc 8 b2))
(repeat n
(setq b1 (entget (ssname a1
index)))
(setq d1 (assoc 8 b1))
(setq b3 (subst d2 d1 b1))
(entmod b3)
(setq index (+ index 1))
)
(princ)
)
Now examine the program line by line.
(defun c:chlayer (/ a1 a2 n
index b1 b2 d1 d2 b3)
Defines the function with all local
variables.
(graphscr)
Changes to graphics screen.
(prompt "\nSelect
entities to be changed: ")
This is a prompt statement.
(setq a1 (ssget))
Allows you to select the objects to be
changed. The selection set is assigned to variable al.
(prompt "\npoint to
entity on target layer: ")
This is a prompt statement.
(setq a2 (entsel))
This is a special type of selection
statement that allows you to select only one entity.
(setq n (sslength a1))
Measures the number of entities in the
selection set in variable a1.
(setq index 0)
Sets the variable called index
to 0.
(setq b2 (entget (car a2)))
This statement gets the entity list from a2.
Thus, a2 is assigned the entity list.
(setq d2 (assoc 8 b2))
This looks for the code 8
in entity list a2, then assigns the sublist
to d2.
(repeat n
This begins the loop that pages through the
selection set.
(setq bl (entget (ssname a1
index)))
This gets the entity list and assigns it to
b1.
(setq d1 (assoc 8 b1))
Gets the sublist code 8
(the layer).
(setq b3 (subst d2 d1 b1))
Substitutes the new d2
layer for the old d1 layer in the entity list
a1, and assigns it to the new entity list b3.
(entmod b3)
Updates the new entity list in the
database.
(setq index (+ index 1))
Increases the index variable by 1,
making it ready for the next loop.
The first )
closes the repeat loop. (princ) exits quitly.
The second ) closes the function.
Substitute text
This program lets you choose a line of text
and substitute another line at exactly the same place.
(defun c:subtext (/ a b d e
d1 b1 y)
(prompt "\nSelect text
line: ")
(setq a (entsel))
(setq b (entget (car a)))
(setq d (assoc 1 b))
(prompt (cdr d))(terpri)
(setq e (getstring 1))
(setq d1 (cons (car d) e))
(setq b1 (subst d1 d b))
(entmod b1)
(setq y (getstring
"\nIs this correct - Y : "))
(if (= (srtcase y)
"N") (entmod b))
(princ)
)
TEXT- OWN DISTANCE, OWN TEXT HEIGHT
This program lets you change the distance
between multiple text lines. In addition to the standard start point and
height, you are asked to enter the distance between text lines. You may
enter as many text lines as you wish. To stop the program, enter an
asterix (*).
(defun tex (/ p1 a b c d e
f)
(setq pl (getpoint
"\nStarting point: "))
(setq a (getdist p1
"\nEnter height: "))
(setq c (getdist p1
"\nline spacing: "))
(setq d "T")
(while d
(setq e (getstring 1
"Text: "))
(command "text"
pl a "0" e)
(setq pl (list (car p1)(-
(cadr p1) c)))
(setq f (getstring))
(if (= f "*")
(setq d nil))
)
(princ)
)
GLOBAL TEXT HEIGHT CHANGE
This program allows you to globally change
the size of text within a WINDOW or CROSSING without affecting other
entities.
(defun chtext (/ a ts n
index b1 b c d b2)
(setq a (ssget))
(setq ts (getreal
"\nEnter new text size"))
(setq n (sslength a))
(setq index 0)
(repeat n
(setq b1 (entget (ssname a
index)))
(setq index (1+ index))
(setq b (assoc 0 b1))
(if (= "TEXT"
(cdr b))
(progn
(setq c (assoc 40 b1))
(setq d (cons (car c) ts))
(setq b2 (subst d c b1))
(entmod b2))))
(princ)
)
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