Exploring AutoLISP Further in .NET

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Exploring AutoLISP Further
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very useful item in most programming languages is the variable. A variable is a symbolic name that can be operated on in a given program. An important part of using variables is that you can assign values to them.
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Creating variables and functions Working with AutoCAD commands and system variables Working with lists Setting conditions and creating loops Managing drawing objects Getting input from the user
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Creating Variables
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The following example sets the value of 3 for a variable named radius.
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(setq radius 3) 3
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You can try this example out in Visual LISP in the Console window. If you want to use this variable on the AutoCAD command line, precede it with an exclamation point (!). For example,
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Command: !radius 3
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The exclamation point before a variable evaluates the value stored in the variable and returns it to the command line. When you use a variable in the Console window that you have already set, you don t need the exclamation point. The Console knows to assume that everything you type there is an AutoLISP expression. Assigning strings to a variable is as easy as assigning numerals to a variable:
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Part VII Programming AutoCAD
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You can also nest AutoLISP expressions place one inside the other.
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As explained in the previous chapter, AutoLISP evaluates LISP expressions from the innermost set of parentheses outward. AutoLISP evaluates (+ 2 1) first, and then assigns the result to the variable radius.
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Step-by-Step: Using AutoLISP Variables from within AutoCAD
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1. Open a drawing using the Start from Scratch option. 2. Type (setq radius (+ 2 1)) . AutoLISP returns 3. 3. Start the CIRCLE command. Specify any center point. At the Specify radius of circle or [Diameter]: prompt, type !radius . AutoCAD draws a circle with a radius of 3 units. 4. Type (setq color green ) . AutoLISP returns green . 5. Type -color . At the Enter default object color <BYLAYER>: prompt, type !color . 6. Draw a circle. The circle is green because the current color is now green. 7. Save your drawing in your AutoCAD Bible folder as ab35-1.dwg.
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Accessing AutoCAD commands from within AutoLISP is a powerful way to automate commonly used functions. By combining access to commands from AutoLISP with variables as described in the previous section, you gain a great deal of flexibility.
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Accessing AutoCAD commands
In the previous chapter when you looked at an AutoLISP routine (see Figure 34-5), you saw an example of the COMMAND function. You use the COMMAND function in AutoLISP to execute AutoCAD commands. This function treats all subsequent operands as if they were typed at the command line interactively. When programming COMMAND functions in AutoLISP, exactly duplicate what you would do at the command line. For example, to draw a line, you follow the steps shown in the following table. The second column shows how you would accomplish the same action in an AutoLISP routine. Enter line at the command line Specify the start point for the line
line (or _line )
Use a variable, actual coordinates, or pause for user input.
35 Exploring AutoLISP Further
Specify the endpoint Press Enter to end the LINE command
Use a variable, actual coordinates, or pause for user input. Use an empty set of two quotation marks to represent pressing Enter within a command or to end a command.
For example, if you are using the variables startpt and endpt for the start point and endpoint of a line, here s how you would access the LINE command in an AutoLISP expression:
(command _line startpt endpt )
Creating functions
Functions always begin with the operator DEFUN. You can define three principal types of functions: The type you have been using thus far precedes the command name defined by DEFUN with c:, which is interpreted by AutoCAD as a command and enables you to use the function by name at the AutoCAD command line. The function becomes usable like any other AutoCAD command. You can also create a function definition without preceding the name with c:. This type is most valuable when it is called by other AutoLISP operations. If you need to execute it at the command line, you must enclose the function name in parentheses. Similarly, you can execute functions prefixed with a c: as an AutoLISP expression by enclosing the functions in parentheses, such as (c:circle3). The third type is S::STARTUP. By defining a function (usually in acaddoc.lsp, which is loaded into every drawing) with the name S::STARTUP, every AutoLISP function in the routine will automatically execute after the drawing has fully initialized. The reason for the S::STARTUP function is to ensure that AutoLISP routines that use the COMMAND function run only after AutoCAD fully initializes the components that can execute commands. When you create an S::STARTUP function, you need to decide where to put it. 34 briefly explained the difference between acad.lsp and acaddoc.lsp. The need for two files arose because AutoCAD includes MDI, which enables you to open more than one drawing at a time. For more information, see the sidebar Automatically loading .lsp files. S::STARTUP is a great tool for enhancing productivity. In this way, you can automate whatever general setup operations you normally do at the beginning of a drawing session or for every drawing you open.