gijs_pong/.planning/phases/02-core-gameplay/02-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
02-core-gameplay	02	ui	canvas game-loop state-machine scoring pong vanilla-js	phase provides 02-core-gameplay/02-01 paddle2, AI module, predictive ray-cast, 3 difficulty presets, Input cleanup	Full game state machine (modeSelect → diffSelect → playing → scored → gameover) Scoring detection (ball exits left/right edge → score1/score2 increment) 1-second post-score pause with auto-serve Match-end condition (first to WIN_SCORE=7 wins) Mode selection UI (1=Solo vs AI, 2=2-Player) Difficulty selection UI (1=Easy, 2=Medium, 3=Hard) Winner overlay with "Press R to play again" R-key restart (scores reset, back to modeSelect) Center divider dashed line rendering Score numbers rendered on canvas (top-left / top-right)	03-menus-audio 04-effects-powerups 05-polish-release	added patterns State machine pattern via gameState string field driving render/update branches GameLoop owns scoring detection; Physics.update() no longer owns out-of-bounds reset pauseTime field on GameLoop tracks scored-state start for 1s serve delay	created modified index.html	GameLoop owns scoring/serve, not Physics: removed auto-reset from Physics.update() so GameLoop can increment scores before calling serveBall() modeSelect state renders full-screen prompt and returns early — no physics/paddles rendered until game starts pauseTime stored on GameLoop object (not GameState) — transient timing data that doesn't need to survive restart Ball hidden during 'scored' pause state (gameState !== 'scored' guard on drawCircle) — clean visual signal to players 2-Player mode skips diffSelect entirely — straight to playing after pressing 2 Winner identity set on GameState.winner as 'player1' | 'ai' | 'player2' — AI win labeled 'AI', not 'Player 2'	State machine pattern: gameState string drives render/update branches in GameLoop.main() GameLoop owns game-level events (scoring, match end, serve); Physics owns physics-level events (collision, deflection)	CORE-05 CORE-06	~5min (continuation after human-verify checkpoint)	2026-03-10

Phase 2 Plan 02: Core Gameplay State Machine Summary

Full game loop with state machine, mode/difficulty selection UI, scoring detection, 1s re-serve pause, match-end at 7 points, and R-key restart — all in a single index.html

Performance

• Duration: ~5 min
• Started: 2026-03-10T20:10:00Z
• Completed: 2026-03-10T20:15:00Z
• Tasks: 2 (1 auto + 1 checkpoint)
• Files modified: 1

Accomplishments

• Game state machine fully wired: modeSelect → diffSelect → playing → scored → gameover → modeSelect
• Scoring detection moved to GameLoop (after Physics.update()), Physics auto-reset removed — scores now correctly increment
• Mode/difficulty selection screens rendered on canvas with clear key prompts
• Winner overlay with player name and restart prompt; R-key cleanly resets all state
• Phase 1 debug speed text removed; center divider dashed line added

Task Commits

Each task was committed atomically:

1. Task 1: State machine — mode/difficulty selection, scoring, match end, and restart - 77071a5 (feat)
2. Task 2: Checkpoint: Verify Phase 2 complete gameplay - approved by user (no code commit)

Files Created/Modified

• index.html - GameLoop.main() rewritten with full state machine; Input._handleKeyDown extended with mode/difficulty/restart keys; Physics.update() out-of-bounds auto-reset removed; pauseTime field added to GameLoop

Decisions Made

• GameLoop owns scoring detection and serve calls — Physics.update() no longer has out-of-bounds reset. This separation is critical: if Physics auto-resets, GameLoop never sees the scoring condition.
• Ball hidden during scored pause via guard on drawCircle — cleaner player feedback than showing stationary ball.
• 2-Player mode bypasses difficulty selection entirely (no AI to configure).
• pauseTime stored on GameLoop (not GameState) — it's transient per-point timing that doesn't need to survive an R-key restart.

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Phase 2 complete: full playable Pong with mode selection, AI opponent, scoring, match end, and restart
• Phase 3 (menus, audio, pause) can proceed — GameState fields (gameState, mode, difficulty, score1, score2, winner) are stable contracts
• No blockers

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Phase: 02-core-gameplay Completed: 2026-03-10