led2/.planning/phases/03-communication-protocol/03-02-SUMMARY.md

phase, plan, subsystem, tags, dependency_graph, tech_stack, key_files, decisions, metrics, requirements

phase	plan	subsystem	tags	dependency_graph	tech_stack	key_files	decisions	metrics	requirements
03-communication-protocol	02	animations	animation rendering tdd python fire2012 rainbow chase strobe pulse	requires provides affects lightsync.animations ANIMATION_REGISTRY create_animation AnimationBase phase-04-timeline-editor phase-05-live-execution	added patterns colorsys (stdlib) math (stdlib) abc (stdlib) random (stdlib) ABC inheritance factory registry TDD red-green pure functions	created modified lightsync/animations/__init__.py lightsync/animations/base.py lightsync/animations/solid_color.py lightsync/animations/chase.py lightsync/animations/pulse.py lightsync/animations/rainbow.py lightsync/animations/strobe.py lightsync/animations/color_wipe.py lightsync/animations/fire.py tests/test_animations.py	chase reverse detection uses offset-not-multiple-of-period for reliable test assertion FireAnimation lazy-initializes heat array per led_count to support variable strip lengths speed parameter mapped differently per animation: pulse maps to period, strobe to Hz, chase/wipe to px/sec	duration completed tasks_completed files_changed 3 min 2026-04-06 1 10	ANI-01 ANI-02

Phase 03 Plan 02: Animation Library Summary

One-liner: 7 animation types (solid_color, chase, pulse, rainbow, strobe, color_wipe, fire) as pure renderers with AnimationBase ABC, ANIMATION_REGISTRY, and create_animation() factory — all via TDD red-green cycle.

What Was Built

The lightsync/animations/ package provides all animation rendering for the LightSync system. Animations are pure computation: render(t, led_count) -> list[tuple]. No I/O, no networking — just pixel data generation that the protocol layer (Plan 01) encodes and sends.

AnimationBase ABC

lightsync/animations/base.py defines the contract:

• render(t: float, led_count: int) -> list[tuple] — render at time t, returns list of (R,G,B) tuples
• from_params(params: dict) -> AnimationBase — construct from CueModel.params dict

7 Animation Types

Animation	Algorithm	Key Params
solid_color	Uniform fill	color, white
chase	Moving segment, modulo pattern	color, bg_color, speed, size, spacing, reverse
pulse	Sine-wave brightness oscillation	color, speed (maps to period 0.1-5.0s), min/max_brightness
rainbow	HSV hue cycle via colorsys	speed, period
strobe	On/off at 1-20 Hz	color, speed, duty_cycle
color_wipe	Progressive fill from start/end	color, speed, reverse
fire	Fire2012: cool+drift+spark+heat-color	cooling, sparking, speed

Registry and Factory

ANIMATION_REGISTRY maps all 7 names to classes. create_animation(name, params) raises ValueError for unknown types.

TDD Execution

RED phase: tests/test_animations.py (24 tests) committed before any implementation. Tests failed with ModuleNotFoundError.

GREEN phase: Implemented all 9 files. One test required a fix: test_chase_reverse initially used t=1.5 which caused offset % period == 0, making fwd and rev identical. Fixed to use t=0.05 (offset=3, not multiple of period=10).

Result: 24/24 tests passing.

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Chase reverse test used symmetrical t value

• Found during: TDD GREEN phase verification
• Issue: At t=1.5 with speed=1.0, offset=90 which is a multiple of period=10, making forward and reverse chase produce identical pixel patterns
• Fix: Changed test t from 1.5 to 0.05 (offset=3, not multiple of period), which reliably distinguishes fwd vs reverse
• Files modified: tests/test_animations.py
• Commit: f4da956

Known Stubs

None. All 7 animation types fully implemented and rendering real pixel data.

Self-Check: PASSED

Files:

• FOUND: lightsync/animations/init.py
• FOUND: lightsync/animations/base.py
• FOUND: lightsync/animations/solid_color.py
• FOUND: lightsync/animations/chase.py
• FOUND: lightsync/animations/pulse.py
• FOUND: lightsync/animations/rainbow.py
• FOUND: lightsync/animations/strobe.py
• FOUND: lightsync/animations/color_wipe.py
• FOUND: lightsync/animations/fire.py
• FOUND: tests/test_animations.py

Commits:

• 920243f: test(03-02): add failing tests for animation library
• f4da956: feat(03-02): implement animation library — 7 types with registry and factory