Essential AutoLISP®: With a Quick Reference Card and a by Roy Harkow

By Roy Harkow

AutoCAD is the main typical computer-aided layout package deal on the earth. beneath AutoCAD is a strong computing language referred to as AutoLISP. This language is designed to automate many capabilities of AutoCAD. This ebook is a hands-on creation to AutoLISP and its purposes. AutoLISP is a distinct and strong language to be able to write, debug, and regulate courses tremendous speedy, when you know how the language itself works. half I comprises an easy-to-learn pictorial illustration for info and code, a device used to simply resolve difficulties in a different way approached via trial and blunder procedure. crucial AutoLISP is the single booklet in its box that makes use of the pictorial illustration. half II is dedicated to studying how AutoLISP strategies the code entered. half V not just explains the explanations of commonest mistakes messages and the way to resolve them, yet examines many different mistakes that do not inevitably supply messages.

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Remember that any AutoLISP object can be an argument to a function, and it is up to the individual function to determine what object types its arguments can be. For example, setq is defined as follows: setqsym obj Takes a symbol and any AutoLISP object and makes the object be the value of that symbol. It returns the object. We can tell that setq takes two arguments because there are two words next to its name. sym indicates that the first argument must be a symbol. obj means that the second argument can be any AutoLISP object that the user chooses to provide.

There are two types of numbers in AutoLISP: integers and reals. 02562e4 Figure 1-2 Integers Integers are the counting numbers, such as 0, 1, 2, 3, -1, and -25. Within AutoLISP, the largest integer is 231 - 1. However, when numbers are passed between AutoLISP and AutoCAD, the largest integer is 2 15- 1• Thus our practical range for integers is -32768 to 32767, the maximum that can be expressed in a 16-bit word. ) Numbers larger than 32767 must be expressed as real numbers, which are stored in 32 bits.

Its car is another cons and its cdr is 8. If you said that the car is 6, then you traced through arrows. 6 is actually the car of the car of the top cons. Again, it takes two steps to go two arrows. In the same picture, what's the cdr of the car of the value of g ? To answer this question, we must first determine the value of the symbol g. lh this picture, g's value is the top cons. Next we must learn the car of that cons. The car is the cons below. Finally, we need to determine the cdr of the lower cons; it's the number 7.

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