utils.lsp

Autocad-2005-简体中文-解密版.zip

;;;                                                                    ;
;;;  UTILS.LSP                                                         ;
;;;                                                                    ;
;;;  Copyright 1987, 1988, 1990, 1992, 1994, 1996, 1997, 1998          ;
;;;  by Autodesk, Inc. All Rights Reserved.                            ;
;;;                                                                    ;
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;;;                                                                    ;
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;;;  consent of Autodesk, Inc.                                         ;
;;;                                                                    ;
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;;;                                                                    ;
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;;;  AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF           ;
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;;;                                                                    ;
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;;;  Parkway, San Rafael, California 94903.                            ;
;;;                                                                    ;

;;;--------------------------------------------------------------------;
;;;  This file is from the Garden Path tutorial, and represents the    ;
;;;  state of the application at the end of Lesson 4.  Use this file   ;
;;;  to check your work, or to start off Lesson 5 with the code as it  ;
;;;  appears in the tutorial.                                          ;
;;;--------------------------------------------------------------------;


;;;--------------------------------------------------------------------;
;;;  First step is to load ActiveX functionality.  If ActiveX support  ;
;;;  already exists in document (can occur when Bonus tools have been  ;
;;;  loaded into AutoCAD), nothing happens.                           ;
;;;--------------------------------------------------------------------;

(vl-load-com)


;;;--------------------------------------------------------------------;
;;;  For ActiveX functions, we need to define a global variable which  ;
;;;  "points" to the Model Space portion of the active drawing.  This  ;
;;;  variable, named *ModelSpace* will be created at load time.        ;
;;;--------------------------------------------------------------------;
(setq *ModelSpace*
       (vla-get-ModelSpace
	 (vla-get-ActiveDocument (vlax-get-acad-object))
       ) ;_ end of vla-get-ModelSpace
) ;_ end of setq

;;;--------------------------------------------------------------------;
;;;     Function: Degrees->Radians                                     ;
;;;--------------------------------------------------------------------;
;;;  Description: This function converts a number representing an      ;
;;;               angular measurement in degrees, into its radian      ;
;;;               equivalent.  There is no error checking done on the  ;
;;;               numberOfDegrees parameter -- it is always expected   ;
;;;               to be a valid number.                                ;
;;;--------------------------------------------------------------------;
(defun Degrees->Radians	(numberOfDegrees)
  (* pi (/ numberOfDegrees 180.0))
) ;_ end of defun


;;;--------------------------------------------------------------------;
;;;     Function: 3dPoint->2dPoint                                     ;
;;;--------------------------------------------------------------------;
;;;  Description: This function takes one parameter representing a     ;
;;;               3D point (a list of three integers or reals), and    ;
;;;               converts it into a 2D point (a list of two reals).   ;
;;;               There is no error checking done on the 3dpt          ;
;;;               parameter --  it is always expected to be a valid    ;
;;;               point.                                               ;
;;;--------------------------------------------------------------------;
;;;   Work to do: Add some kind of parameter checking so that this     ;
;;;               function won't crash a program if it is passed a     ;
;;;               null value, or some other kind of data type than a   ;
;;;               3D point.                                            ;
;;;--------------------------------------------------------------------;
(defun 3dPoint->2dPoint	(3dpt)
  (list (float(car 3dpt)) (float(cadr 3dpt)))
) ;_ end of defun


;;;--------------------------------------------------------------------;
;;;     Function: list->variantArray                                   ;
;;;--------------------------------------------------------------------;
;;;  Description: This function takes one parameter representing a     ;
;;;               list of double values, e.g. a list of 2D points:     ;
;;;               '(p1.X p1.Y p2.X p2.Y p3.X p3.Y p4.X p4.Y).          ;
;;;		  The list is converted into an ActiveX                ;
;;;		  variant based on a safearray.                        ;
;;;               No error checking is performed on the parameter --   ;
;;;               it is assumed to consist of a list of doubles.       ;
;;;------------------------------------------------------------------- ;
(defun gp:list->variantArray (ptsList / arraySpace sArray)
					; allocate space for an array of 2d points stored as doubles
  (setq	arraySpace
	 (vlax-make-safearray
	   vlax-vbdouble		; element type
	   (cons 0
		 (- (length ptsList) 1)
	   )				; array dimension
	 )

  )
  (setq sArray (vlax-safearray-fill arraySpace ptsList))
					; return array variant
  (vlax-make-variant sArray)
)