Automatic AutoCAD exam grading

Grade AutoCAD drawings
in seconds, not hours

Answer Key

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VS

Upload Student Drawings

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📄 Files: each student named from their file. 📁 Folder: named from each student's sub-folder (Moodle). The preview below shows the names before grading.

Before you upload — what a correct answer key looks like

Correct key — the drawing views only — **Correct** — the drawing views only

Wrong key — sheet border and title block included — **Wrong** — sheet border & title block

Uploaded a key with a border anyway? LineMaster detects it and offers to strip it automatically before grading.

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Statistics

Class performance at a glance.

Grade some drawings first (Home → Start Grading), then come back here.

How the Marking Works

Exactly how a score is computed, with worked examples.

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1

Extract the geometry

Every drawing is reduced to simple shapes: line segments, circles and arcs, each tagged with its layer and center. No AutoCAD needed.

استخراج الهندسي — يُختزل كل رسم إلى عناصر بسيطة مثل الخطوط المستقيمة والدوائر والأقواس، مع تعريف الطبقة والمركز.

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2

Align student to key

Students draw at any size, position, and 90° rotation. The engine tries scales, rotations {0,90,180,270}, and a position per view (Hough), then verifies.

محاذاة الطالب مع المفتاح — يتم تجربة المقياس والدوران، ثم إيجاد أفضل موضع لكل منظر بالتصويت، فلا يتأثر التصحيح بالحجم والمكان.

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3

Score by length coverage

The mark is Coverage = how much of the key's total line-length the student reproduced. We check each key line for a nearby parallel student line.

التصحيح بالتغطية بالطول — الدرجة = كم من طول خطوط المفتاح أعاد الطالب رسمه. نقيس الطول لا عدد الخطوط.

Simple example: rectangle 10×6 vs 6×6

Key is a 10×6 rectangle; the student drew a 6×6 square (right height, wrong width).

Key — 10×6

Student — 6×6

matched missing extra

Coverage = (6+6+6+0) / (6+10+10+6) = 18/32 ≈ 56%. Credit for the correct height and the overlapping width; the wrong width is penalised. The square's right edge (right length, wrong place) is also flagged extra.

العلامة = (٦+٦+٦+٠) ÷ ٣٢ ≈ ٥٦٪. علامة على الارتفاع الصحيح والجزء المشترك من العرض، وخصم على العرض الناقص. الضلع الأيمن (طوله صحيح ومكانه غلط) يُحسب زائداً.

Complex example: L-bracket with a hole

An L-shape (6 edges, length 30) + a hole (circumference ≈ 6.3). The student draws the L but makes the right part too short and forgets the hole.

Key feature	Length	Covered	Note
Bottom edge	10	8	last 2 missing
Right edge	4	0	missing wrong position
Middle edge	6	4	last 2 missing
Inner + top + left	16	16	matched
Hole (circle)	6.3	0	missing not drawn

Coverage = (8+0+4+16+0) / 42.3 = 28/42.3 ≈ 66%. The shape is mostly right; the short side and forgotten hole cost marks — each shows as a numbered error.

العلامة = (٨+٠+٤+١٦+٠) ÷ ٤٢٫٣ ≈ ٦٦٪. الشكل العام صحيح، لكن الجهة القصيرة والثقب المنسي يخصمان علامات.

The Three Numbers

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1. Coverage (%)

How much of the key's total line-length the student reproduced.

كم من طول المفتاح أعاد الطالب رسمه.

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2. Missing (%)

Key line-length not reproduced by the student.

طول المفتاح الناقص الذي لم يُرسم.

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3. Extra (%)

Extra line-length drawn that is not in the key.

طول خطوط إضافية رسمها الطالب وغير موجودة في المفتاح.

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Grade AutoCAD drawingsin seconds, not hours