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* Player Animation State Machine for Black Trigram
*
* Manages player character animations with frame-accurate timing at 60fps.
* Supports animation priorities, transitions, and event callbacks.
*
* Based on game-design.md specifications:
* - Attack: 12 frames (200ms at 60fps)
* - Block: 4 frames (67ms at 60fps)
* - Walk: 6 frames
* - Stance change: 600ms
*
* @module systems/animation/AnimationStateMachine
* @category Animation
* @korean 애니메이션상태머신
*/
import { canInterrupt } from "./AnimationPriority";
import { isTransitionAllowed } from "./AnimationTransitions";
import type {
AnimationConfig,
AnimationEvents,
AnimationMachineState,
AnimationPriority,
AnimationState,
AnimationUpdateResult,
} from "./types";
/**
* Default animation configurations based on game-design.md
*
* Frame timings:
* - Attack: 12 frames = 200ms at 60fps
* - Block: 4 frames = 67ms at 60fps
* - Walk: 6 frames = 100ms at 60fps
* - Hit: 4 frames = 67ms at 60fps
* - Stance change: 36 frames = 600ms at 60fps
*
* @korean 기본애니메이션설정
*/
export const DEFAULT_ANIMATION_CONFIGS: Map<AnimationState, AnimationConfig> =
new Map([
[
"idle",
{
state: "idle",
frames: 4,
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
[
"walk",
{
state: "walk",
frames: 6,
fps: 60,
loop: true,
interruptible: true,
priority: 1 as AnimationPriority,
duration: 6 / 60,
},
],
[
"run",
{
state: "run",
frames: 8,
fps: 60,
loop: true,
interruptible: true,
priority: 2 as AnimationPriority,
duration: 8 / 60,
},
],
[
"stance_change",
{
state: "stance_change",
frames: 36, // 600ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: 3 as AnimationPriority,
duration: 0.6,
},
],
[
"defend",
{
state: "defend",
frames: 4, // 67ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: 4 as AnimationPriority,
duration: 4 / 60,
},
],
[
"attack",
{
state: "attack",
frames: 12, // 200ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: 5 as AnimationPriority,
duration: 12 / 60,
},
],
[
"hit",
{
state: "hit",
frames: 4, // 67ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: 6 as AnimationPriority,
duration: 4 / 60,
},
],
[
"ko",
{
state: "ko",
frames: 30, // 500ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: 7 as AnimationPriority,
duration: 0.5,
},
],
]);
/**
* Player Animation State Machine
*
* Manages animation state, transitions, and timing with frame-accurate updates.
* Integrates priority system and event callbacks.
*
* @example
* ```typescript
* const machine = new PlayerAnimationStateMachine(DEFAULT_ANIMATION_CONFIGS, {
* onAnimationStart: (state) => console.log(`Started ${state}`),
* onAnimationComplete: (state) => console.log(`Completed ${state}`),
* onFrame: (frame, state) => {
* if (state === "attack" && frame === 6) {
* // Execute attack at midpoint (frame 6 of 12)
* executeAttackLogic();
* }
* }
* });
*
* // In game loop (useFrame)
* useFrame((state, delta) => {
* const result = machine.update(delta);
* updatePlayerVisuals(result.state, result.frame);
* });
*
* // Trigger animations
* machine.transitionTo("attack");
* ```
*
* @korean 플레이어애니메이션상태머신
*/
export class PlayerAnimationStateMachine {
private currentState: AnimationState = "idle";
private frameIndex = 0;
private timeAccumulator = 0;
private previousState: AnimationState | null = null;
private justStarted = false;
private justCompleted = false;
/**
* Create a new animation state machine
*
* @param animations - Map of animation configurations
* @param events - Optional event callbacks
*
* @korean 생성자
*/
constructor(
private readonly animations: Map<AnimationState, AnimationConfig>,
private readonly events?: AnimationEvents
) {}
/**
* Update animation state with delta time
*
* Call this in useFrame for 60fps updates.
* Handles frame progression, looping, and completion.
*
* @param deltaTime - Time elapsed since last update (in seconds)
* @returns Animation update result with current state and frame
*
* @korean 업데이트
*/
update(deltaTime: number): AnimationUpdateResult {
const currentAnim = this.animations.get(this.currentState);
Iif (!currentAnim) {
return {
state: this.currentState,
frame: 0,
progress: 0,
justCompleted: false,
justStarted: false,
};
}
// Reset just started/completed flags
const wasJustStarted = this.justStarted;
this.justStarted = false;
const previousJustCompleted = this.justCompleted;
this.justCompleted = false;
// Accumulate time
this.timeAccumulator += deltaTime;
const frameDuration = 1 / currentAnim.fps;
// Check if we should advance to next frame
if (this.timeAccumulator >= frameDuration) {
const previousFrame = this.frameIndex;
this.frameIndex++;
this.timeAccumulator -= frameDuration;
// Emit frame event
if (this.events?.onFrame && previousFrame !== this.frameIndex) {
this.events.onFrame(this.frameIndex, this.currentState);
}
// Handle animation completion
if (this.frameIndex >= currentAnim.frames) {
if (currentAnim.loop) {
// Loop back to start
this.frameIndex = 0;
} else {
// Animation completed
this.justCompleted = true;
if (this.events?.onAnimationComplete) {
this.events.onAnimationComplete(this.currentState);
}
// Auto-transition to idle for non-looping animations
if (this.currentState !== "idle" && this.currentState !== "ko") {
// Direct transition to idle without interrupt event
this.previousState = this.currentState;
this.currentState = "idle";
this.frameIndex = 0;
this.timeAccumulator = 0;
this.justStarted = true;
if (this.events?.onAnimationStart) {
this.events.onAnimationStart("idle");
}
} else E{
// Stay on last frame
this.frameIndex = currentAnim.frames - 1;
}
}
}
}
const progress = currentAnim.frames > 0 ? this.frameIndex / currentAnim.frames : 0;
return {
state: this.currentState,
frame: this.frameIndex,
progress,
justCompleted: previousJustCompleted,
justStarted: wasJustStarted,
};
}
/**
* Attempt to transition to a new animation state
*
* Checks transition rules and priority system before transitioning.
*
* @param newState - Target animation state
* @returns Whether transition was successful
*
* @example
* ```typescript
* // Successful transitions
* machine.transitionTo("walk"); // idle -> walk
* machine.transitionTo("attack"); // walk -> attack
*
* // Failed transition (invalid or lower priority)
* machine.transitionTo("walk"); // attack -> walk (blocked, must complete first)
* ```
*
* @korean 상태전환
*/
transitionTo(newState: AnimationState): boolean {
// Don't transition to same state
if (this.currentState === newState) {
return false;
}
// Check if transition is allowed by rules
if (!isTransitionAllowed(this.currentState, newState)) {
return false;
}
const currentAnim = this.animations.get(this.currentState);
const newAnim = this.animations.get(newState);
Iif (!newAnim) {
return false;
}
// Check priority system
Iif (
currentAnim &&
!canInterrupt(this.currentState, newState, currentAnim.interruptible)
) {
return false;
}
// Emit interrupt event if current animation wasn't completed
Eif (this.frameIndex < (currentAnim?.frames ?? 0) - 1) {
if (this.events?.onAnimationInterrupted) {
this.events.onAnimationInterrupted(this.currentState, newState);
}
}
// Execute transition
this.previousState = this.currentState;
this.currentState = newState;
this.frameIndex = 0;
this.timeAccumulator = 0;
this.justStarted = true;
this.justCompleted = false;
// Emit start event
if (this.events?.onAnimationStart) {
this.events.onAnimationStart(newState);
}
return true;
}
/**
* Get current animation state
*
* @returns Current animation state
* @korean 현재상태가져오기
*/
getCurrentState(): AnimationState {
return this.currentState;
}
/**
* Get current frame index
*
* @returns Current frame index (0 to frames-1)
* @korean 현재프레임가져오기
*/
getCurrentFrame(): number {
return this.frameIndex;
}
/**
* Get previous animation state
*
* @returns Previous animation state or null
* @korean 이전상태가져오기
*/
getPreviousState(): AnimationState | null {
return this.previousState;
}
/**
* Get current animation configuration
*
* @returns Current animation config or undefined
* @korean 현재애니메이션설정가져오기
*/
getCurrentAnimation(): AnimationConfig | undefined {
return this.animations.get(this.currentState);
}
/**
* Reset animation state machine to idle
*
* @korean 초기화
*/
reset(): void {
this.currentState = "idle";
this.frameIndex = 0;
this.timeAccumulator = 0;
this.previousState = null;
this.justStarted = false;
this.justCompleted = false;
}
/**
* Get full internal state (for debugging/testing)
*
* @returns Current state machine state
* @korean 상태가져오기
*/
getState(): AnimationMachineState {
return {
currentState: this.currentState,
frameIndex: this.frameIndex,
timeAccumulator: this.timeAccumulator,
isPlaying: true,
previousState: this.previousState,
};
}
}
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