Coding the Command-ended Function

Coding the Command-ended Function

Now that you have seen the pseudo-code and handled some important details, replace
the stubbed-out code in the gp:command-ended reactor callback with the following:

(defun gp:command-ended (reactor command-list
                         / objReactor
                         reactorToChange reactorData
                         coordinateValues currentPoints
                         newReactorData newPts
    ;; CONDITION 1 - POLYLINE ERASED (Erase command)
    ;; If one or more polyline borders are being erased (indicated
    ;; by the presence of *reactorsToRemove*), erase the tiles
    ;; within the border, then remove the reactor.
      (foreach objReactor *reactorsToRemove*
        (gp:erase-tiles objReactor)
      (setq *reactorsToRemove* nil)

    ;; CONDITION 2 - LOST ASSOCIATIVITY (Move, Rotate, etc.)
    ;; If associativity has been lost (undo, move, etc.), then
    ;; erase the tiles within each border
    ((and *lostassociativity* *reactorsToChange*)
      (foreach reactorToChange *reactorsToChange*
        (gp:erase-tiles reactorToChange)
      (setq *reactorsToChange* nil)

    ;; In this case, the associativity of the tiles to the path is
    ;; kept, but the path and the tiles will need to be
    ;; recalculated and redrawn. A GRIP_STRETCH can only be
    ;; performed on a single POLYLINE at a time.
    ((and (not *lostassociativity*)
      (member "GRIP_STRETCH" command-list)
      ;; for a GRIP_STRETCH, there will be only one reactor in
      ;; the global *reactorsToChange*.
      (setq reactorData
         (vlr-data (setq reactorToChange
                  (car *reactorsToChange*)

     ;; First, erase the tiles within the polyline border.
     (gp:erase-tiles reactorToChange)

     ;; Next, get the current coordinate values of the polyline
     ;; vertices.
     (setq coordinateValues
           (vla-get-coordinates *polyToChange*)

     ;; If the outline is a lightweight polyline, you have
     ;; 2d points, so use utility function xyList-ListOfPoints
     ;; to convert the coordinate data into lists of
     ;; ((x y) (x y) ...) points. Otherwise, use the
     ;; xyzList-ListOfPoints function that deals
     ;; with 3d points, and converts the coordinate data into
     ;; lists of ((x y z) (x y z) ... ) points.
     (setq CurrentPoints
        (if (= (vla-get-ObjectName *polytochange*) "AcDbPolyline")
          (xyList-ListOfPoints coordinateValues)
          (xyzList-ListOfPoints coordinateValues)

     ;; Send this new information to RedefinePolyBorder -- this
     ;; will return the new Polyline Border
     (setq NewReactorData
       (gp:RedefinePolyBorder CurrentPoints reactorData)

     ;; Get all the border Points and ...
     (setq newpts
              (cdr (assoc 12 NewReactorData))
              (cdr (assoc 13 NewReactorData))
              (cdr (assoc 14 NewReactorData))
              (cdr (assoc 15 NewReactorData))

     ;; ...update the outline of the polyline with the new points
     ;; calculated above.  If dealing with a lightweight polyline,
     ;; convert these points to 2D (since all the points in
     ;; newpts are 3D), otherwise leave them alone.
     (if (= (cdr (assoc 4 NewReactorData)) "LIGHT")
       (setq newpts (mapcar '(lambda (point)
                        (3dPoint-2dPoint Point)

     ;; Now update the polyline with the correct points.

       ;; For description of the list-variantArray see utils.lsp.
       (gp:list-variantArray (apply 'append newpts))

     ;; Now use the current definition of the NewReactorData, 
     ;; which is really the same as the garden path data
     ;; structure. The only exception is that the field (100) 
     ;; containing the list of tiles is nil.  This is OK since
     ;; gp:Calculate-and-Draw-Tiles does not require this field 
     ;; to draw the tiles. In fact this function creates the tiles
     ;; and returns a list of drawn tiles.
     (setq tileList (gp:Calculate-and-Draw-Tiles
              ;; path data list without correct tile list
              ;; Object creation function
              ;; Within a reactor this *MUST* be ActiveX

     ;; Now that you have received all the tiles drawn, rebuild
     ;; the data structure with the correct tileList value and
     ;; reset the data property in the reactor.
     ;; Update the tiles associated with the polyline border.
     (setq NewReactorData
        (subst (cons 100 tileList)
           (assoc 100 NewReactorData)

     ;; By now you have the new data associated with the polyline.
     ;; All there is left to do is associate it with the reactor
     ;; using vlr-data-set.
     (vlr-data-set (car *reactorsToChange*) NewReactorData)

     ;; Remove all references to the temporary
     ;; variables *polytochange* and *reactorsToChange*.
     (setq *polytochange*     nil
       *reactorsToChange* nil
    ;; Delete any items in the *Safe-to-Delete* global if you can!!!
    (Gp:Safe-Delete (car command-list))

Learning AutoCad

w that you have seen the pseudo-code and handled some important details, replace the stubbed-out code in the gp:commandended reactor callback with …command–ended (reactor command-list / objReactor reactorToChange reactorData coordinateValues currentPoints newReactorData newPts tileList )function and it's not aware nor compatible with the C++ idioms. It does not perform cleanup on your objects, …Functions are denoted by prepending a colon to their name. Functions are defined after the main script at the end of the file. For the …function terminates for, while, switch, try, if, and parfor statements.end-of-file (commonly abbreviated EOF) is a condition in a computer operating system where no more data can be read from a data source. The data source is usually called a file or stream. In the C Standard Library, the character reading functions such as getchar … It allows programs to use the same code to read input from both a terminal …end a program (or function) prior to its normal termination by using an … the program, but continue with the remainder of the programming code.End command is used together with the different control structures, … and For( loop, to indicate the end of the code block for the respective control structure.end. Terminate block of code, or indicate last index of array. Syntax. while expression % (or if, for, or try) statements end B = A(index:end,index). Description .End statement stops code execution abruptly, and does not invoke the … For example, End Function terminates the definition of a Function procedure.