Lets assume variable b is the list 10 5. You want to pull out the entire element and assign it to a variable c. 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. Allows you to substitute one aspect for another. Now lets substitute 20 for the 5 in the variable c. The new element will look like this: 40 h. You need to construct a new variable containing the entire list element, then use the new variable in the subst function.
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 Therefore, car c is the new first element, followed by the value of h. Thus it produces a new list d 40 In the list found in variable b and assigns the new list to b1.
Takes an angle in radians and converts it into a string, using a specific format. Angtos has two arguments, the first controls the format and the second controls the precision. This function returns the convertion of an integer to a real number. One can use either real or an integer.
In other words, it is not used to assign a value to a variable as it is in some other programming languages. AutoLisp uses the setq function to perform this task. In AutoLisp, the equals character is used to test if items are equal, it does not make them equal.
This is very useful if we are trying to test certain conditions. For example, we can begin to construct tests with an outcome such as "if one thing is equal to another thing, do something". That's what conditionals are all about; they allow your program to make decisions. If a is equal to b , then b will be assigned the value 5. If it is not, then b will be assigned the value 6. 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 is a value other than 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. 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.
A closing parenthesis closes the loop, and program will continue with the commands after this. An entity is the smallest object you can place on your screen. Entities are stored and referenced in the drawing database.
Each entity has a massive definition in AutoCAD's database. You can modify any of the above aspects. An example of an entity list:. Both give you a way of selecting the entities for the selection set. You will mostly be using ssget. Lets you secure the name of the entity. The name of your entity might be Lets assume variable a is the selection set and variable i is set to 0. 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. This command actually pulls out, or extracts, the entity list. The entity list can be assigned to a variable. Assume variable b is the name of the list and variable c contains the value of the element: 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. This program permits you to draw lines perpendicular to other lines. Erases everything on the drawing screen. Note: if you accidentally invoke this command, you can recover with OOPS. 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. This overwrites the original definition and makes the built-in function or symbol inaccessible. To get a list of built-in and previously defined functions, use the atoms-family function.
Remarks If you do not declare any arguments or local symbols, you must supply an empty set of parentheses after the function name. Examples defun myfunc x y One argument, one local variable defun myfunc Untested but this should work.. Message 4 of Kent Cooper , AIA. Message 5 of Code updated above..
Message 6 of Hi I got the " Polyline Diet" lisp from Message 7 of Hi Kent! I've been learning them for about a month now I'm just trying to make it one command to turn a line into a polyline then run PDL then turn it back into a spline. Message 8 of Yes, that's where I downloaded it from. I'll give it a try thanks! Message 9 of Kent1Cooper wrote As the author of PLDiet, Message 10 of You would have to either Look it up in your help.
Message 11 of
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