Modifying-Other-Calls-to-GpCalculate-and-Draw-Tiles

Modifying Other Calls to Gp:Calculate-and-Draw-Tiles

Modifying Other Calls to Gp:Calculate-and-Draw-Tiles

In the reactor callback, a hard-coded string “ActiveX” is passed to gp:Calculate-and-Draw-Tiles as the ObjectCreationStyle argument. But what about the other times gp:Calculate-and-Draw-Tiles is invoked?

If you remember back to Lesson 4, it was pointed out that whenever you change a stubbed-out
function, you need to ask the following questions:

  • Has the function call (invocation) changed? That is, does the function still take
    the same number of arguments?
  • Does the function return something different?

The same questions need to be asked any time you make a significant change to a working
function as you build, refine, and update your applications. In this case, you need
to find any other functions in your project that invoke gp:Calculate-and-Draw-Tiles. Visual LISP has a feature that helps you do this.

To find all calls to gp:Calculate-and-Draw-Tiles in your project

  1. In the Visual LISP text editor window, double-click on the word gp:Calculate-and-Draw-Tiles within the gpdraw.lsp file.
  2. Click Search Find from the Visual LISP menu.

    Because you preselected the function name, it is already listed as the string to search
    for.

  3. Select the Project button listed under Search in the Find dialog box.

    When you select this option, the Find dialog box expands at the bottom, and you can
    select the project to be searched.

  4. Specify your current project name, then click the Find button.

    Visual LISP displays the results in the Find output window:

  5. Look at the results in the Find Output window and determine whether there are any
    other locations in your code where you make a call to gp:Calculate-and-Draw-Tiles. There should only be one: a location within gpmain.lsp.
  6. In the Find Output window, double-click on the line of code calling gp:Calculate-and-Draw-Tiles.

    Visual LISP activates a text editor window and takes you right to that line of code
    in gpmain.lsp. The code currently appears as follows:

    (setq tilelist (gp:Calculate-and-Draw-Tiles gp_PathData))
  7. Replace the line of code with the following:
    (setq tilelist (gp:Calculate-and-Draw-Tiles gp_PathData nil))

    Why nil? Take another look at the pseudo-code:

    If ObjectCreationStyle is nil, assign it from the BoundaryData.

    Passing nil as a parameter to gp:Calculate-and-Draw-Tiles causes that function to check the user’s choice of how to draw the tiles (as determined
    by the dialog box selection and stored in gp_PathData). Subsequent calls from the command-ended reactor callback, however, will override
    this behavior by forcing the use of ActiveX.

Congratulations! You now have the basic reactor functionality in place. If you prefer,
copy the gpmain.lsp and gpdraw.lsp files from the TutorialVisualLISPLesson7 into your working directory and examine the completed, debugged code.

There is still a lot of work to be done, and it is all triggered from this fragment
of code in the gp:Command-ended function:

(setq NewReactorData
    (gp:RedefinePolyBorder CurrentPoints reactorData)
) ;_ end of setq

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