Animation Controller

A lightweight, flexible TypeScript-based animation controller for managing complex animation state transitions using flags and triggers. Ideal for games, interactive apps, or any UI/UX scenario that requires structured animation flows.

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Features

• Define animation states with associated animation logic
• Use triggers or boolean flags to manage transitions
• Add conditional transitions (including reversible ones)
• Loop animations
• Clone and control individual animations
• Adjustable global speed control
• Built with TypeScript for full type safety

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Usage

Install

npm install animation-controller

Define Animations

const idleAnim = new Animation({ name: "idle", play: () => {} });
const walkAnim = new Animation({ name: "walk", play: () => {} });

Build Controller

const ac = new AnimControllerBuilder()
  .addState({ name: "idle", animation: idleAnim })
  .addState({ name: "walk", animation: walkAnim })
  .addFlag("isMoving")
  .addTransition("idle->walk", {
    flagConditions: { isMoving: true },
    reverse: true,
  })
  .build();

ac.start();

Update State

ac.setFlag("isMoving", true); // Will trigger idle -> walk
ac.setFlag("isMoving", false); // Will trigger walk -> idle (reverse)

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Concepts

States

Each state represents a named condition with an optional animation.

Flags

Boolean values that influence transitions.

Triggers

One-shot signals used to initiate transitions.

Transitions

Define how and when to move between states. Can be:

• Trigger-based
• Flag-based

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File Structure

src/
├── animation/     # Core animation logic
├── controller/    # State machine logic
├── technical/     # Utility helpers (e.g., sleep)
├── tests/         # Vitest test cases