Enabling the Boundary Outline Drawing Function

Enabling the Boundary Outline Drawing Function

After the last lesson, the gp:drawOutline function looked like the following:

;;;     Function: gp:drawOutline                                 ;
;;; Description: This function draws the outline of the          ;
;;;              garden path.                                    ;
(defun gp:drawOutline ()
    (strcat "This function will draw the outline of the polyline "
and return a polyline entity name/pointer."
  ;; For now, simply return a quoted symbol.  Eventually, this 
  ;; function will return an entity name or pointer.

As it exists, the code does not do much. However, using the association list information
stored in the variable gp_PathData, you have enough information to calculate the points for the path boundary. You now
have to determine how to pass the information in that variable to gp:drawOutline.

Remember gp_PathData is a local variable defined within the C:GPath function. In AutoLISP, local variables declared in one function are visible to any
function called from that function (refer to Differentiating between Local and Global
Variables for clarification). The gp:drawOutline function is called from within C:GPath. You can refer to the gp_PathData variable in gp:drawOutline, but this is not a good programming practice.

Why? When the two functions using the same variable are defined in the same file,
as in the examples shown so far, it is not too difficult to figure out where the variable
is defined and what it is used for. But if the functions are defined in different
files—as is often the case—you would have to search through both files to figure out
what gp_PathData represents.

Learning AutoCad

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