drawline-with-errors.lsp

Autocad-2005-简体中文-解密版.zip

;;;                                                                    ;
;;;  DRAWLINE-WITH-ERRORS.LSP                                          ;
;;;                                                                    ;
;;;  Copyright 1987, 1988, 1990, 1992, 1994, 1996, 1997, 1998, 1999    ;
;;;  by Autodesk, Inc. All Rights Reserved.                            ;
;;;                                                                    ;
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;;;  software without charge, provided you do so exclusively for       ;
;;;  your own use or for use by others in your organization in the     ;
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;;;  copyright notice and the limited warranty and restricted rights   ;
;;;  notice below appear in all supporting documentation.              ;
;;;                                                                    ;
;;;  Incorporation of any part of this software into other software,   ;
;;;  except when such incorporation is exclusively for your own use    ;
;;;  or for use by others in your organization in the performance of   ;
;;;  their normal duties, is prohibited without the prior written      ;
;;;  consent of Autodesk, Inc.                                         ;
;;;                                                                    ;
;;;  Copying, modification and distribution of this software or any    ;
;;;  part thereof in any form except as expressly provided herein is   ;
;;;  prohibited without the prior written consent of Autodesk, Inc.    ;
;;;                                                                    ;
;;;  AUTODESK PROVIDES THIS SOFTWARE "AS IS" AND WITH ALL FAULTS.      ;
;;;  AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF           ;
;;;  MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE.  AUTODESK,       ;
;;;  INC. DOES NOT WARRANT THAT THE OPERATION OF THE SOFTWARE          ;
;;;  WILL BE UNINTERRUPTED OR ERROR FREE.                              ;
;;;                                                                    ;
;;;  Restricted Rights for US Government Users.  This software         ;
;;;  and Documentation are provided with RESTRICTED RIGHTS for US      ;
;;;  US Government users.  Use, duplication, or disclosure by the      ;
;;;  Government is subject to restrictions as set forth in FAR         ;
;;;  12.212 (Commercial Computer Software-Restricted Rights) and       ;
;;;  DFAR 227.7202 (Rights in Technical Data and Computer Software),   ;
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;;;  Parkway, San Rafael, California 94903.                            ;
;;;                                                                    ;

;;;--------------------------------------------------------------------;
;;; General Note: This sample code contains deliberate errors.         ;
;;;--------------------------------------------------------------------;
;;; This file is a bugged example. It is used as a teaching method     ;
;;; within the manual.                                                 ;
;;;--------------------------------------------------------------------;

;;;--------------------------------------------------------------------;
;;;       Function:  DRAWLINE                                          ;
;;;                                                                    ;
;;;    Description:  The DRAWLINE function prompts the user to select  ;
;;;                  two points, then function draws a line using the  ;
;;;                  (command "_.line" ...) function. Then performs    ;
;;;                  very simple input validation -- in this case,     ;
;;;                  simply checking to see if the two point variables ;
;;;                  exist before drawing the line.                    ;
;;;                                                                    ;
;;;      Arguments: none                                               ;
;;;                                                                    ;
;;; Returned Value:  none                                              ;
;;;                                                                    ;
;;;          Usage: (drawline)                                         ;
;;;--------------------------------------------------------------------;
(defun drawline	(/ pt1 pt2)		; local variables declared
  ;; get two points from the user
  (setq pt1 (getpoint "\nEnter the start point for the line: "))
  (setq pt2 (getpoint "\nEnter the end point for the line: "))
  ;; check to see that the two points exist
  (iff (and pt1 pt2)
    (command "_.line" pt1 pt2 "")
    (princ "\nInvalid or missing points!")
    (princ)      ;;  exit 'quietly'
  )				
)