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Tianpok/image arena background#46

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liang799 merged 5 commits into
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tianpok/image-arena-background
Apr 18, 2026
Merged

Tianpok/image arena background#46
liang799 merged 5 commits into
mainfrom
tianpok/image-arena-background

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@liang799 liang799 commented Apr 18, 2026

Implemented on tianpok/image-arena-background from main.

After running profiler, realised that rendering background was computationally expensive, as it is being rerendered constantly.

Changes:

  • Added image-backed cached renderer in ArenaBackgroundRenderer.java
  • Simplified ArenaSceneRenderer.java to delegate background drawing instead of doing procedural drawing inline.
  • Added packaged PNG asset at arena-background.png
  • Added resource packaging test in ArenaBackgroundRendererTest

Summary by CodeRabbit

Release Notes

  • Refactor

    • Background rendering logic has been extracted into a dedicated, reusable component for improved maintainability and separation of concerns.
  • Tests

    • Added test coverage to validate the integrity and correctness of the packaged background asset.
  • Documentation

    • Updated architecture diagrams to reflect the new rendering component structure.

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coderabbitai Bot commented Apr 18, 2026

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 18598860-4cf5-46c3-8cbd-02da95542a99

📥 Commits

Reviewing files that changed from the base of the PR and between 237f064 and 8f96ddf.

⛔ Files ignored due to path filters (2)
  • docs/uml-diagrams/imgs/plantuml_class_diagram.png is excluded by !**/*.png
  • docs/uml-diagrams/imgs/plantuml_class_diagram.svg is excluded by !**/*.svg
📒 Files selected for processing (2)
  • docs/uml-diagrams/plantuml_class_diagram.puml
  • src/test/java/sc2002/turnbased/ui/gui/view/ArenaBackgroundRendererTest.java
✅ Files skipped from review due to trivial changes (1)
  • docs/uml-diagrams/plantuml_class_diagram.puml
🚧 Files skipped from review as they are similar to previous changes (1)
  • src/test/java/sc2002/turnbased/ui/gui/view/ArenaBackgroundRendererTest.java

📝 Walkthrough

Walkthrough

A new package-private ArenaBackgroundRenderer was added to load, scale, cache, and draw a background image. ArenaSceneRenderer had its inline background drawing removed and now holds a backgroundRenderer field injected via new constructors, delegating background rendering to the new class. UML and tests were updated.

Changes

Cohort / File(s) Summary
UML / Documentation
docs/uml-diagrams/plantuml_class_diagram.puml
Added ArenaBackgroundRenderer <<boundary>> class, added ownership relation from ArenaSceneRenderer, and updated SRP legend.
Background Rendering Extraction
src/main/java/sc2002/turnbased/ui/gui/view/ArenaBackgroundRenderer.java, src/main/java/sc2002/turnbased/ui/gui/view/ArenaSceneRenderer.java
Added new ArenaBackgroundRenderer (resource constant, constructors, render method, caching, SourceCrop record). Removed inline background-drawing code from ArenaSceneRenderer, added backgroundRenderer field and two constructors (no-arg and injected) with null checks.
Tests
src/test/java/sc2002/turnbased/ui/gui/view/ArenaBackgroundRendererTest.java
Added tests that load the packaged background resource, verify PNG signature bytes, and assert ImageIO.read returns a non-null image with positive dimensions.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

  • PR #42: Both PRs modify ArenaSceneRenderer and the UML diagram; this PR introduces ArenaBackgroundRenderer dependency that aligns with the architectural changes in the related PR.

Poem

🐰 I hopped through pixels, tidy and spry,
I fetched a backdrop from resources high,
Scaled and cached with a careful nibble,
Now scenes keep calm while I paint the dribble,
Hooray for clean hops and a lighter sky! 🎨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
Title check ❓ Inconclusive The title refers to a real aspect of the changeset (image-based arena background), but it is overly broad and vague, lacking specific detail about the primary change (refactoring background rendering to use cached image renderer). Consider a more specific title like 'Refactor arena background rendering to use cached image renderer' to clearly convey the main architectural change.
✅ Passed checks (1 passed)
Check name Status Explanation
Description Check ✅ Passed Check skipped - CodeRabbit’s high-level summary is enabled.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

✨ Finishing Touches
📝 Generate docstrings
  • Create stacked PR
  • Commit on current branch
🧪 Generate unit tests (beta)
  • Create PR with unit tests
  • Commit unit tests in branch tianpok/image-arena-background

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@liang799
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@copilot resolve the merge conflicts in this pull request

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Actionable comments posted: 1

🧹 Nitpick comments (1)
docs/uml-diagrams/plantuml_class_diagram.puml (1)

1065-1065: Composition is stronger than the code now guarantees.

ArenaSceneRenderer can receive an externally constructed ArenaBackgroundRenderer via constructor injection, so this is not always a strict ownership/lifecycle relationship. Using *-- makes the diagram more coupled than the implementation.

Suggested diagram update
-ArenaSceneRenderer "1" *-- "1" ArenaBackgroundRenderer
+ArenaSceneRenderer "1" --> "1" ArenaBackgroundRenderer
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@docs/uml-diagrams/plantuml_class_diagram.puml` at line 1065, The diagram
currently shows a composition relationship (ArenaSceneRenderer "1" *-- "1"
ArenaBackgroundRenderer) but the implementation allows an externally constructed
ArenaBackgroundRenderer via constructor injection, so change the relationship to
a weaker one (e.g., aggregation or plain association) to reflect non-exclusive
ownership; update the PlantUML line to use o-- or -- between ArenaSceneRenderer
and ArenaBackgroundRenderer to indicate aggregation/association instead of
composition.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/test/java/sc2002/turnbased/ui/gui/view/ArenaBackgroundRendererTest.java`:
- Around line 23-30: Current test packagesBackgroundAsPngResource only checks
PNG_SIGNATURE bytes but not that the resource decodes; add a test that either
instantiates ArenaBackgroundRenderer (calling its constructor or factory) or
fully decodes the resource via ImageIO.read(InputStream) using
ArenaBackgroundRenderer.BACKGROUND_RESOURCE, then assert the returned
BufferedImage is non-null and has plausible width/height (>0). Reference the
existing test method packagesBackgroundAsPngResource, the class
ArenaBackgroundRenderer and its BACKGROUND_RESOURCE constant when locating where
to add the new assertion or new test.

---

Nitpick comments:
In `@docs/uml-diagrams/plantuml_class_diagram.puml`:
- Line 1065: The diagram currently shows a composition relationship
(ArenaSceneRenderer "1" *-- "1" ArenaBackgroundRenderer) but the implementation
allows an externally constructed ArenaBackgroundRenderer via constructor
injection, so change the relationship to a weaker one (e.g., aggregation or
plain association) to reflect non-exclusive ownership; update the PlantUML line
to use o-- or -- between ArenaSceneRenderer and ArenaBackgroundRenderer to
indicate aggregation/association instead of composition.
🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

  • Push a commit to this branch (recommended)
  • Create a new PR with the fixes

ℹ️ Review info
⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 28c602d0-bbff-4a99-b4a2-728a72431811

📥 Commits

Reviewing files that changed from the base of the PR and between 28b0c70 and 237f064.

⛔ Files ignored due to path filters (5)
  • docs/uml-diagrams/imgs/plantuml_class_diagram.png is excluded by !**/*.png
  • docs/uml-diagrams/imgs/plantuml_class_diagram.svg is excluded by !**/*.svg
  • docs/uml-diagrams/imgs/plantuml_sequence_diagram.png is excluded by !**/*.png
  • docs/uml-diagrams/imgs/plantuml_sequence_diagram.svg is excluded by !**/*.svg
  • src/main/resources/sc2002/turnbased/ui/gui/assets/arena-background.png is excluded by !**/*.png
📒 Files selected for processing (4)
  • docs/uml-diagrams/plantuml_class_diagram.puml
  • src/main/java/sc2002/turnbased/ui/gui/view/ArenaBackgroundRenderer.java
  • src/main/java/sc2002/turnbased/ui/gui/view/ArenaSceneRenderer.java
  • src/test/java/sc2002/turnbased/ui/gui/view/ArenaBackgroundRendererTest.java

@liang799 liang799 merged commit 6869e41 into main Apr 18, 2026
4 checks passed
@liang799 liang799 deleted the tianpok/image-arena-background branch April 18, 2026 04:02
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