---
phase: 03-komplettes-spielerlebnis
plan: 03
subsystem: ui
tags: [svg, css-grid, indexeddb, animation, forest-scene]

requires:
  - phase: 01-grundgeruest
    provides: "IndexedDB schema with forestElements store"
provides:
  - "Visual forest scene with SVG woodland background"
  - "4x3 CSS grid overlay for forest element images"
  - "renderForestScene() function loading elements from IndexedDB"
  - "Fade-in + scale-up animation for new elements"
affects: [03-04, reward-flow, forest-display]

tech-stack:
  added: []
  patterns: ["Object URL lifecycle management (create/revoke)", "SVG layered background with CSS grid overlay"]

key-files:
  created: []
  modified: ["index.html", "src/styles/main.css", "src/forest/scene.ts"]

key-decisions:
  - "SVG element order: sky first (back), then clouds/sun, trees, hills, ground (front) for correct layering"
  - "Object URLs tracked in module-level array and revoked on re-render to prevent memory leaks"
  - "Random offset +-10-20px on element images for natural (non-grid-like) placement"

patterns-established:
  - "Object URL lifecycle: track in module array, revoke all before re-render"

requirements-completed: [FRST-01, FRST-02, FRST-03]

duration: 2min
completed: 2026-03-29
---

# Phase 03 Plan 03: Forest Scene Summary

**SVG woodland background with 4x3 CSS grid overlay rendering IndexedDB forest elements with fade-in animation**

## Performance

- **Duration:** 2 min
- **Started:** 2026-03-29T11:40:00Z
- **Completed:** 2026-03-29T11:42:00Z
- **Tasks:** 2
- **Files modified:** 3

## Accomplishments
- SVG forest background with sky gradient, clouds, sun, background trees, hills, and ground
- 4x3 CSS grid overlay positioned absolutely over SVG for element placement
- renderForestScene() loads all ForestElements from IndexedDB and renders as images with random offset
- New element animation (fade-in + scale-up, 1.2s ease-out) via CSS class
- Object URL memory leak prevention with tracked revocation on re-render

## Task Commits

Each task was committed atomically:

1. **Task 1: SVG forest background and grid HTML structure** - `c9abc9e` (feat)
2. **Task 2: Render forest elements from IndexedDB** - `e1fc5eb` (feat)

## Files Created/Modified
- `index.html` - Added forest scene container with SVG background and grid overlay in forest screen
- `src/styles/main.css` - Added forest scene CSS: grid layout, element styling, appear animation keyframes
- `src/forest/scene.ts` - Added renderForestScene() with IDB loading, Object URL management, animation class

## Decisions Made
- SVG element order: sky rect painted first (background), then clouds/sun, trees, hills, ground on top for correct visual layering
- Object URLs stored in module-level array and revoked before each re-render to prevent memory leaks
- Random offset of +-10-20px applied to each element image for natural, non-rigid placement within grid cells

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Forest scene ready for Plan 04 (reward flow) to call renderForestScene(db, newElementId) after generating new elements
- Level map still renders alongside the forest scene as expected

## Self-Check: PASSED

- All 3 modified files exist on disk
- Both task commits verified in git log (c9abc9e, e1fc5eb)
- SUMMARY.md created successfully

---
*Phase: 03-komplettes-spielerlebnis*
*Completed: 2026-03-29*
