Paint App Grading Rubric

Scoring System

Each feature: 0–3 points

Score	Meaning
0	Not implemented or broken
1	Partial - major issues
2	Mostly working - minor bugs
3	Fully working

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Feature 1: Basic Drawing (3 pts)

• User can set display name
• Can create/join canvases
• Brush tool draws strokes
• Eraser removes content
• Color picker works
• Strokes sync in real-time to other users

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Feature 2: Live Cursors (3 pts)

• See other users' cursor positions
• Cursors have user name + color
• Cursor shows current tool icon
• Cursors update smoothly (not choppy)
• Cursors fade when user inactive

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Feature 3: Shapes (3 pts)

• Rectangle tool works
• Ellipse tool works
• Line/arrow tool works
• Shapes have stroke/fill colors
• Shapes sync to other users

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Feature 4: Selection & Collaborative Awareness (3 pts)

• Can select elements
• Can move/resize selected elements
• Can delete selected elements
• See other users' selections (colored outline)
• Selection syncs in real-time

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Feature 5: Layers with Locking (3 pts)

• Can create multiple layers
• Can reorder layers
• Can toggle visibility
• Lock layer shows "Locked by [user]"
• Only locker can edit locked layer
• Auto-unlock on leave/timeout

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Feature 6: Presence & Activity Status (3 pts)

• Shows list of users on canvas
• Shows status: active/idle/away
• Shows each user's current tool
• Status updates automatically
• Auto-away after inactivity

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Feature 7: Comments (3 pts)

• Can drop comment pins on canvas
• Comments have threaded replies
• Can resolve/unresolve comments
• Click comment to pan to location
• Comments sync in real-time

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Feature 8: Version History (3 pts)

• Auto-saves versions periodically
• Can manually save named version
• Can view version list
• Can preview old versions
• Can restore old versions

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Feature 9: Permissions (3 pts)

• Owner can set viewer/editor roles
• Viewers cannot draw (tools disabled)
• Role change takes effect instantly
• Owner can kick users
• Kicked users removed immediately

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Feature 10: Follow Mode (3 pts)

• Can click user to follow them
• Viewport syncs in real-time
• Shows "Following [user]" indicator
• Manual pan/zoom stops following
• Multiple users can follow same person

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Feature 11: Activity Feed (3 pts)

• Shows real-time action log
• Actions have timestamps + user
• Click entry to pan to location
• Updates in real-time as actions happen
• Old entries auto-removed

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Feature 12: Private Canvases & Sharing (3 pts)

• Canvases private by default
• Can generate share link
• Can set link permissions (view/edit)
• Can invite by username
• Can revoke share link

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Feature 13: Canvas Chat (3 pts)

• Chat panel for collaborators
• Messages show user + timestamp
• "User is typing..." indicator works
• Chat history persists
• Notification badge for new messages

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Feature 14: Auto-Cleanup & Notifications (3 pts)

• Inactive canvases marked for deletion
• Deletion happens after scheduled time
• Warning before deletion
• Activity resets timer
• "Keep Forever" option works

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Feature 15: Text & Sticky Notes (3 pts)

• Text tool adds text to canvas
• Can change font size/color
• Sticky note tool works
• "User is editing..." indicator while typing
• Text syncs in real-time

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Summary

Feature	Max	Score
1. Basic Drawing	3
2. Live Cursors	3
3. Shapes	3
4. Selection	3
5. Layers + Locking	3
6. Presence	3
7. Comments	3
8. Version History	3
9. Permissions	3
10. Follow Mode	3
11. Activity Feed	3
12. Sharing	3
13. Canvas Chat	3
14. Auto-Cleanup	3
15. Text & Stickies	3
TOTAL	45

Key Differentiator Tests

These criteria specifically test SpacetimeDB strengths (bold items above):

1. Real-time cursor smoothness - Are cursor updates laggy?
2. Layer lock speed - Is locking instant?
3. Permission enforcement - Does demotion cancel in-progress action?
4. Follow mode sync - Does viewport follow without lag?
5. Activity feed latency - Do actions appear immediately?
6. Scheduled deletion - Does auto-cleanup actually fire?
7. Typing indicators - Do they appear/disappear correctly?

Score these separately to measure STDB advantage.