Calculating Areas of Multiple Objects in AutoCAD

Lisp for Calculating Areas of Multiple Objects in AutoCAD




ALisp routine can simplify repetitive tasks like calculating the areas of multiple objects (polylines, circles, etc.) in AutoCAD. Below is a guide to creating a Lisp routine that extracts and lists the areas of selected objects.

1. Understanding the Task

- AutoCAD objects such asclosed polylines,circles, andregions have an area property.

- The Lisp routine will:

  1. Allow users to select multiple objects.

  2. Extract the area of each selected object.

  3. Display or export the calculated areas (e.g., to the command line or a file)

2. Sample Lisp Code

 

Here is an example Lisp code for calculating the areas of multiple objects:

 https://mega.nz/folder/uEwwWYJJ#SqSlsWbhlihseMZO4vL-Fg lisp

(defun c:MultiArea (/ obj area total areas fileName)

  ;; Initialize variables

  (setq total 0)

  (setq areas nil)

 

  ;; Prompt the user to select objects

  (prompt "\nSelect closed objects to calculate areas: ")

  (setq selSet (ssget '((0 . "LWPOLYLINE,CIRCLE,REGION")))) ; Filter for closed objects

 

  (if selSet

    (progn

      ;; Loop through selected objects

      (repeat (setq i (sslength selSet))

        (setq obj (vlax-ename->vla-object (ssname selSet (setq i (1- i)))))

        ;; Get the area of the object

        (setq area (vla-get-Area obj))

        (setq areas (cons area areas))

        (setq total (+ total area))

      )

     

      ;; Display areas in the command line

      (princ "\nAreas of selected objects:")

      (foreach a (reverse areas)

        (princ (strcat "\nArea: " (rtos a 2 2))) ; Display each area with 2 decimal points

      )

     

      ;; Display the total area

      (princ (strcat "\nTotal Area: " (rtos total 2 2)))

 

      ;; Option to save to a file

      (setq fileName (getfiled "Save Areas to File" "" "txt" 1))

      (if fileName

        (progn

          (setq file (open fileName "w"))

          (write-line "Areas of selected objects:" file)

          (foreach a (reverse areas)

            (write-line (strcat "Area: " (rtos a 2 2)) file)

          )

          (write-line (strcat "Total Area: " (rtos total 2 2)) file)

          (close file)

          (princ (strcat "\nAreas saved to file: " fileName))

        )

      )

    )

    (prompt "\nNo valid objects selected.")

  )

 

  ;; End the routine

  (princ)

)

3. How It Works

1.Selection:

   - The routine prompts the user to select objects (polylines, circles, or regions).

   - It uses a filter to ensure only closed objects are selected.

 2.Area Calculation:

   - For each object, the `vla-get-Area` method retrieves the area.

   - The routine sums up the areas and stores individual values in a list.

 3.Output:

   - It displays each area and the total area in the command line.

   - Optionally, the areas are saved to a text file.

 4. Loading the Lisp Routine

1. Save the code as a `.lsp` file (e.g., `MultiArea.lsp`).

2. In AutoCAD:

   - Use the `APPLOAD` command to load the Lisp file.

   - Alternatively, add the Lisp file to the startup suite for automatic loading.

3. Run the command by typing `MultiArea` in the command line

5. Customization

Add Object Types:

  - Modify the object filter in `(ssget '((0 . "LWPOLYLINE,CIRCLE,REGION")))` to include other object types like `ELLIPSE` or `HATCH`.

 Precision:

  - Adjust `(rtos a 2 2)` to change the precision of the area display (e.g., 2 decimal places).

 Export Formats:

  - Enhance the file output to support formats like CSV.

 6 Example Workflow

1. Type `MultiArea` in the command line.

2. Select closed objects in the drawing.

3. View areas in the command line or export them to a file.


https://mega.nz/folder/uEwwWYJJ#SqSlsWbhlihseMZO4vL-Fg

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