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AutoLISP is a small, dynamically scoped , dynamically typed Lisp language dialect with garbage collection , immutable list structure, and settable symbols, lacking in such regular Lisp features as macro system, records definition facilities, arrays, functions with variable number of arguments or let bindings. The properties of these graphical entities are revealed to AutoLISP as association lists in which values are paired with AutoCAD group codes that indicate properties such as definitional points, radii, colors, layers, linetypes, etc.
LSP files. AutoLISP code can interact with the user through AutoCAD's graphical editor by use of primitive functions that allow the user to pick points, choose objects on screen, and input numbers and other data.
After that, its development was neglected by Autodesk in favor of more fashionable development environments like Visual Basic for Applications VBA ,. However, it has remained AutoCAD's main user customizing language.
This is part of a long-term process of changing from VBA to. NET for user customizing. Note the final line inside the function definition: when evaluated with no arguments, the princ function returns a null symbol, which is not displayed by the AutoCAD command-line interface. Therefore, without the final call to the princ function, the result of this would be:. The above code defines a new function which generates an AutoCAD point object at a given point, with a one-line text object displaying the X and Y coordinates beside it.
The name of the function includes a special prefix 'c:', which causes AutoCAD to recognize the function as a regular command. The user, upon typing 'pointlabel' at the AutoCAD command line, would be prompted to pick a point, either by typing the X and Y coordinates, or clicking a location in the drawing.
The function would then place a marker at that point, and create a one-line text object next to it, containing the X and Y coordinates of the point expressed relative to the active User Coordinate System UCS. The function requires no parameters , and contains one local variable 'pnt'. The above example could also be written using built-in AutoCAD commands to achieve the same result, however this approach is susceptible to changes to the command prompts between AutoCAD releases.
From Wikipedia, the free encyclopedia. Timeline of Lisp dialects v t e. Retrieved 14 April Archived from the original on 15 April Archived from the original on Autodesk AutoCAD. Lisp programming language. Automatic storage management Conditionals Dynamic typing Higher-order functions Linked lists M-expressions deprecated Read—eval—print loop Recursion S-expressions Self-hosting compiler Tree data structures.
Lisp machine TI Explorer Space-cadet keyboard. Symbolics Xanalys. Edmund Berkeley Daniel G. Bobrow William Clinger R. Scott Fahlman Richard P. Gabriel Philip Greenspun 10th rule David A. Moon Kent Pitman Guy L. Steele Jr. Daniel Weinreb. Gerald Jay Sussman Julie Sussman.
List Category Category. Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. Download as PDF Printable version. Autodesk , Basis Software. January ; 36 years ago Israel United States Czech Republic.
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