Part VII Programming AutoCAD in .NET

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Part VII Programming AutoCAD
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which is also usually called c:.) You could use just circle3, but you would have to type (circle3) at the command line to use the routine. The last item on Line 1 is (/ pt). The pt after the slash means that pt is a local variable. A variable stores a value for later use in the routine. A local variable is used only in its own routine and is not retained for use in other routines. If you replaced (/ pt) with simply ( ) the pt variable would be available to other AutoLISP routines as well. Line 2 is the simplest line in this routine it simply prints the statement Please click a point: at the command line. Anything in the quotes after princ will be printed on the AutoCAD command line. In this case, the statement is used as a prompt to tell the user to pick a point. Line 3 is typical of AutoLISP routines in which nested parentheses can drive the reader crazy. Remember to read from the innermost parenthesis pair outward. So reading from the innermost parenthesis pair, you have first (getpoint). This means to simply get a point. Any of the AutoCAD input methods work clicking the screen, typing coordinates for a point, or using object snaps. Reading outward you have (setq pt (getpoint)). The statement setq means that the variable pt is set to whatever comes back from getpoint. So if you enter the coordinates 2,2 by typing them or selecting them on the screen, the variable pt equals 2,2. Line 4 reads (command _circle pt 3 ). The command function in AutoLISP is one of the easier functions to understand. It simply executes whatever AutoCAD command is specified in the quotes that follow, using all subsequent arguments. When the CIRCLE command is invoked in AutoCAD, it asks for the center point first and then the radius. Line 4 starts the CIRCLE command, uses for the center point whatever is assigned to the variable pt, and sets the radius to 3 units.
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An underscore precedes the CIRCLE command so that it can be translated into other language versions of AutoCAD.
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The Visual LISP window contains a number of tools that make your programming life simpler. These tools represent the difference between the old way of writing AutoLISP code creating text files in a text editor and the new visual way, with tools that help you format and complete your code. Some of the most useful tools include: Format Edit Window: Choose Format Edit Window on the Tools toolbar (or choose Tools Format Code in Editor) to indent code (and comments) so that it is more readable. Indenting code helps you understand levels of nested parentheses more clearly. Of course, you can indent your code manually, but automatic indenting is a boon to all AutoLISP programmers.
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34 Understanding AutoLISP and Visual LISP Basics
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Format Selection: Select the code you want to format. Then choose Format Selection on the Tools toolbar (or choose Tools Format Code in Selection) to indent only the selected code. Check Edit Window: Choose Check Edit Window from the Tools toolbar (or choose Tools Check Text in Editor) to perform a preliminary evaluation prior to loading the file. This evaluation checks the code for unbalanced parentheses, invalid function definition formatting (an attempt to redefine a built-in or protected function), and many other common errors. Visual LISP opens the Build Output window to show you the results. Check Selection: Select the code you want to check. Choose Check Selection from the Tools toolbar (or choose Tools Check Selection) to perform a preliminary evaluation on selected code. Visual LISP opens the Build Output window to show you the results.
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Parentheses Matching: The most common error for an AutoLISP programmer is incorrect parentheses matching. Visual LISP enables you to jump between matching parentheses and quickly check your current nesting level as you develop your application. While you can use the menu items (Edit Parentheses Matching Match Forward and Match Backward), you will find the keyboard shortcuts distract you less from the code you are looking at. To find a matching right parenthesis, press Ctrl+]. To find a left matching parenthesis, press Ctrl+[.
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You can highlight all the code between matching parentheses. To highlight from left to right, place the cursor in front of a left parenthesis and press Ctrl+Shift+], or simply double-click. To highlight from right to left (backwards), place the cursor after a right parenthesis and press Ctrl+Shift+[, or double-click.
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Load Selection: You have already seen how to load the code in the active window. You can also load selected code. Select the code you want to load and choose Load Selection from the Tools toolbar or choose Tools Load Selection. Comment Block: In Figure 34-5, you saw an example of a comment. Visual LISP supports several comment styles, which are covered in 35. Visual LISP simplifies the addition of a 3-semicolon comment. To place a 3-semicolon comment, highlight the text you wish to change into a comment and click Comment Block on the Tools toolbar. See 35 for more information on creating comments. Uncomment Block: To remove a 3-semicolon comment, click Uncomment Block on the Tools toolbar.
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Another feature of Visual LISP is the Console window. The Console window usually resides at the bottom of the Visual LISP window. The Console window is similar to the AutoCAD command line. Just as you can enter AutoLISP expressions on the AutoCAD command line, as explained later in this chapter, you can also enter AutoLISP expressions in the Console window and see the results. Each line uses a _$ prompt.
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