MouseTrainer.Domain 1.0.0

MouseTrainer

Deterministic mouse dexterity trainer — precision, control, and flow.

Built on .NET 8 MAUI (Windows-first), with a fully deterministic fixed-timestep simulation, composable blueprint mutators, and platform-stable run identity.

NuGet Packages

Architecture

Four-module modular monolith. No cycles, no platform leakage into libraries.

MouseTrainer.Domain        --> (nothing)          Shared primitives, RNG, run identity
MouseTrainer.Simulation    --> Domain             Deterministic loop, modes, mutators, levels
MouseTrainer.Audio         --> Domain             Cue system, asset verification
MouseTrainer.MauiHost      --> all three          Composition root, MAUI platform host

See docs/modular.manifesto.md for the full dependency graph and constitutional rules.

Game Modes

ReflexGates

Side-scrolling gate challenge. Oscillating apertures on vertical walls — navigate the cursor through each gate before the scroll catches you. Deterministic seed → identical level every time.

• Fixed 60 Hz timestep with accumulator-based catch-up
• xorshift32 RNG seeded per run for platform-stable generation
• FNV-1a 64-bit hashing for run identity (same seed + mode + mutators = same RunId everywhere)

Blueprint Mutators

Six composable transforms that reshape generated levels before play. Applied as an ordered fold over LevelBlueprint:

Mutators are pure functions: LevelBlueprint → LevelBlueprint. They compose via pipeline (specs.Aggregate), are factory-resolved from MutatorRegistry, and their parameters are frozen into the RunId hash for reproducibility.

SegmentBias Shapes

• Crescendo (shape=0): Easy start → hard finish. d = 2t - 1
• Valley (shape=1): Hard middle, easy ends. d = 8t(1-t) - 1
• Wave (shape=2): Alternating easy/hard segments. d = (-1)^k

Project Structure

src/
  MouseTrainer.Domain/          Leaf module — events, input, runs, RNG
    Events/                     GameEvent, GameEventType
    Input/                      PointerInput
    Runs/                       RunDescriptor, RunId, MutatorId/Spec/Param, ModeId, DifficultyTier
    Utility/                    DeterministicRng (xorshift32)

  MouseTrainer.Simulation/      Deterministic simulation engine
    Core/                       DeterministicLoop, FrameResult, IGameSimulation
    Debug/                      ISimDebugOverlay
    Levels/                     LevelBlueprint, ILevelGenerator, LevelGeneratorRegistry
    Modes/ReflexGates/          Gate, ReflexGateSimulation, ReflexGateGenerator, ReflexGateConfig
    Mutators/                   IBlueprintMutator, MutatorPipeline, MutatorRegistry, 6 mutators
    Session/                    SessionController, SessionModels

  MouseTrainer.Audio/           Audio cue system
    Assets/                     AssetManifest, AssetVerifier, IAssetOpener
    Core/                       AudioDirector, AudioCue, AudioCueMap, IAudioSink

  MouseTrainer.MauiHost/        MAUI composition root (Windows)

tests/
  MouseTrainer.Tests/           214 tests across 6 categories
    Architecture/               Dependency boundary enforcement
    Determinism/                Replay regression, RNG, session controller
    Levels/                     Generator extraction
    Mutators/                   Blueprint mutator correctness + composition
    Persistence/                Session store
    Runs/                       RunDescriptor golden hashes + identity

tools/
  MouseTrainer.AudioGen/        Audio asset generation tooling

docs/
  modular.manifesto.md          Dependency graph + constitutional rules
  MAUI_AssetOpener_Snippet.md   Platform asset wiring snippet

Build & Test

# Build simulation library (0 warnings, TreatWarningsAsErrors)
dotnet build src/MouseTrainer.Simulation/

# Run all 214 tests
dotnet test tests/MouseTrainer.Tests/

# Run MAUI host (Windows — use Visual Studio, set startup to MauiHost)

Key Design Principles

• Determinism is constitutional. Same seed → same simulation → same score, always. No DateTime.Now, no Random, no platform-dependent floats in the hot path.
• Modular monolith, not microservices. Four assemblies with enforced one-way dependencies. Domain is the leaf; MauiHost is the only composition root.
• Protocol-grade identity. MutatorId, ModeId, RunId are permanent — once created, frozen forever. FNV-1a hashing with canonical parameter serialization.
• Warnings are errors. Library projects use <TreatWarningsAsErrors>true</TreatWarningsAsErrors>. MAUI host opts out (SDK-generated warnings).

License

MIT