How to Measure Total Cumulative Length & Area of Multiple Polylines in CAD
Calculate combined linear cable/pipe runs and total slab areas across hundreds of selected polylines, arcs, and splines in GstarCAD 2027 and AutoCAD.
⚡ Quick Executive Fix
In GstarCAD 2027, run AREA > Add Area > Object (or built-in Express Tool TLE / TotalLength) to sum selected entities, use DATAEXTRACTION to export layer-grouped totals to Excel, or run the C:TOTALLEN AutoLISP routine below.
1. Engineering Root-Cause Diagnosis inside the AC1032 DWG Database
Notice that selecting 50 individual `LWPOLYLINE` cable trenches or `LINE` pipe segments and opening the `PROPERTIES` (`Ctrl+1`) palette displays **`*VARIES*`** in the `Length` and `Area` fields rather than summing them. For quantity surveyors and MEP estimators performing Bill of Quantities (BoQ) takeoffs, summing hundreds of segments manually with a calculator is slow and error-prone.
2. Step-by-Step Resolution Protocol in AutoCAD & GstarCAD 2027
1. Method A: Use GstarCAD 2027's Built-In Total Length & Area Tools
In GstarCAD 2027, run AREATABLE or Express Tools Total Length (`TLE`) to select multiple lines, arcs, polylines, and splines by layer filter and insert an automatically summed takeoff table directly into the drawing.
2. Method B: Cumulative AREA Command (Add / Subtract Mode)
Type AREA, enter A (Add mode), then enter O (Object), and click each closed slab polyline one by one. The command line maintains a running `Total area = ...` accumulator. Press `Enter` and type `S` (Subtract) to deduct interior elevator shaft openings.
3. Method C: Instant One-Second AutoLISP Summation (`C:TOTALLEN`)
Load the `C:TOTALLEN` routine below using `vlax-curve-getDistAtParam` and `vlax-curve-getArea` to compute both total linear length and total enclosed area across 10,000+ selected objects in a single window selection.
3. Automated AutoLISP Diagnostic & Repair Script (C:TOTALLEN)
Load the following production AutoLISP routine into GstarCAD 2027 or AutoCAD via APPLOAD (or add it to gcaddoc.lsp) to automate this repair across affected project files:
(defun C:TOTALLEN ( / ss i ent totalLen totalArea len area)
(vl-load-com)
(setq totalLen 0.0 totalArea 0.0)
(princ "\nSelect curves (Lines, Polylines, Arcs, Circles, Splines) to sum: ")
(if (setq ss (ssget '((0 . "LINE,LWPOLYLINE,POLYLINE,ARC,CIRCLE,SPLINE,ELLIPSE"))))
(progn
(repeat (setq i (sslength ss))
(setq ent (ssname ss (setq i (1- i))))
(setq len (vl-catch-all-apply 'vlax-curve-getDistAtParam (list ent (vlax-curve-getEndParam ent))))
(if (not (vl-catch-all-error-p len)) (setq totalLen (+ totalLen len)))
(setq area (vl-catch-all-apply 'vlax-curve-getArea (list ent)))
(if (not (vl-catch-all-error-p area)) (setq totalArea (+ totalArea area)))
)
(princ (strcat "\n=== QUANTITY TAKEOFF SUMMARY (" (itoa (sslength ss)) " Entities) ==="))
(princ (strcat "\nTotal Cumulative Length : " (rtos totalLen 2 3) " drawing units"))
(princ (strcat "\nTotal Cumulative Area : " (rtos totalArea 2 3) " sq. units"))
)
)
(princ)
)4. Diagnostic System Variables & Edge-Case Matrix
| Failure Symptom / Scenario | Command / SysVar | Production Remediation Rule |
|---|---|---|
| Properties palette shows Length = *VARIES* | Run C:TOTALLEN or TLE |
Ctrl+1 compares properties rather than summing; use curve integration. |
| Self-intersecting polyline gives wrong area | BOUNDARY (BO) |
Create a clean non-self-intersecting region/polyline before measuring area. |
| Need live Excel breakdown by Layer | DATAEXTRACTION |
Exports Length, Area, and Layer columns directly to .xlsx pivot tables. |
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