Roy Harkow's Essential AutoLISP®: With a Quick Reference Card and a PDF

By Roy Harkow

AutoCAD is the main common computer-aided layout package deal on the earth. beneath AutoCAD is a strong computing language known as AutoLISP. This language is designed to automate many features of AutoCAD. This publication is a hands-on advent to AutoLISP and its functions. AutoLISP is a distinct and robust language so as to write, debug, and alter courses tremendous quick, 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 mistake procedure. crucial AutoLISP is the single ebook in its box that makes use of the pictorial illustration. half II is dedicated to studying how AutoLISP procedures the code entered. half V not just explains the motives of most typical errors messages and the way to unravel them, yet examines many different blunders that do not inevitably supply messages.

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Additional info for Essential AutoLISP®: With a Quick Reference Card and a Diskette

Sample text

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. Thus, the cdr of the car of the value of g is 7. This brings us to one of the most unusual rules of AutoLISP. In AutoLISP, we do everything backward!

If you'd like to try the examples, you can enter them at the Command: prompt. Be sure that you type them in exactly as shown, and that the parentheses and double quotes balance. If you make a mistake or get an error message, simply press and the Command: prompt will return. Here's an important point to keep in mind: Nothing we do in AutoLISP will harm our drawing, AutoCAD, or AutoLISP itself! The worst thing that can happen is we'll have to exit and reenter the drawing. But even that situation arises very rarely.

Not all object types are discussed in this chapter. 4 Numbers Numbers are used in AutoLISP in much the same manner as they are used in AutoCAD. We count with them, perform mathematical operations on them, use them to represent colors, and convert them to strings in order to place them in our drawings. Those of us who have programmed in other computer languages will find that numbers behave in a familiar manner. 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.

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