Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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, getStanceTransition, type StanceTransition } from "./AnimationTransitions";
import {
createMotionPredictionState,
updateMotionPrediction,
predictFutureKeyframe,
type MotionPredictionState,
type EasingName,
} from "./KeyframeInterpolation";
import { TrigramStance } from "../../types/common";
import { AnimationState } from "./types";
import type {
AnimationConfig,
AnimationEvents,
AnimationMachineState,
AnimationPriority,
AnimationUpdateResult,
FallType,
} from "./types";
import type { AnimationKeyframe } from "../../types/skeletal";
import { STEP_PRIORITY } from "./types";
import { FALL_TO_GROUND_MAP } 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
* - Stance guards: 4-6 frames = breathing animation at 60fps
* - Tactical steps: 18 frames = 300ms at 60fps, 30cm distance
*
* Defensive animations (방어 애니메이션):
* - Block Success (막기): 8 frames = 133ms - absorb impact, maintain guard
* - Parry Deflect (받아넘기기): 10 frames = 167ms - redirect attack, counter window
* - Guard Break (방어붕괴): 15 frames = 250ms - arms forced wide, vulnerable
* - Guard Recovery (방어복구): 12 frames = 200ms - restore guard position
*
* @korean 기본애니메이션설정
*/
export const DEFAULT_ANIMATION_CONFIGS: Map<AnimationState, AnimationConfig> =
new Map<AnimationState, AnimationConfig>([
[
AnimationState.IDLE,
{
state: AnimationState.IDLE,
frames: 4,
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
[
AnimationState.WALK,
{
state: AnimationState.WALK,
frames: 6,
fps: 60,
loop: true,
interruptible: true,
priority: 1 as AnimationPriority,
duration: 6 / 60,
},
],
[
AnimationState.RUN,
{
state: AnimationState.RUN,
frames: 8,
fps: 60,
loop: true,
interruptible: true,
priority: 2 as AnimationPriority,
duration: 8 / 60,
},
],
[
AnimationState.STANCE_CHANGE,
{
state: AnimationState.STANCE_CHANGE,
frames: 36, // 600ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: 3 as AnimationPriority,
duration: 0.6,
easing: "smooth-transition", // Smooth S-curve for stance changes
},
],
[
AnimationState.STANCE_SIDE_SWITCH,
{
state: AnimationState.STANCE_SIDE_SWITCH,
frames: 24, // 400ms at 60fps for left↔right switch
fps: 60,
loop: false,
interruptible: false,
priority: 3 as AnimationPriority,
duration: 0.4,
},
],
[
AnimationState.DEFEND,
{
state: AnimationState.DEFEND,
frames: 4, // 67ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: 4 as AnimationPriority,
duration: 4 / 60,
},
],
// Defensive animations (방어 애니메이션) - Enhanced guard break system
[
AnimationState.DEFEND_BLOCK_SUCCESS,
{
state: AnimationState.DEFEND_BLOCK_SUCCESS,
frames: 8, // 133ms at 60fps - absorb impact, maintain guard
fps: 60,
loop: false,
interruptible: false, // Must complete block animation
priority: 6 as AnimationPriority, // Higher than defend, same as hit
duration: 0.133,
easing: "controlled-slow", // Controlled deceleration for impact absorption
},
],
[
AnimationState.DEFEND_PARRY,
{
state: AnimationState.DEFEND_PARRY,
frames: 10, // 167ms at 60fps - redirect attack, open counter opportunity
fps: 60,
loop: false,
interruptible: false, // Must complete parry animation
priority: 7 as AnimationPriority, // Higher than block, creates counter window
duration: 0.167,
counterWindow: 0.2, // 200ms counter-attack opportunity after parry
},
],
[
AnimationState.DEFEND_GUARD_BREAK,
{
state: AnimationState.DEFEND_GUARD_BREAK,
frames: 15, // 250ms at 60fps - arms forced wide, vulnerable state
fps: 60,
loop: false,
interruptible: false, // Cannot interrupt guard break
priority: 8 as AnimationPriority, // Highest priority (same as fall)
duration: 0.25,
vulnerabilityDuration: 0.5, // 500ms vulnerable state after guard break
},
],
[
AnimationState.DEFEND_RECOVERY,
{
state: AnimationState.DEFEND_RECOVERY,
frames: 12, // 200ms at 60fps - restore guard position
fps: 60,
loop: false,
interruptible: true, // Can be interrupted by attacks
priority: 2 as AnimationPriority, // Same as run, lower than defend
duration: 0.2,
easing: "natural-motion", // Physics-based recovery
},
],
[
AnimationState.ATTACK,
{
state: AnimationState.ATTACK,
frames: 12, // 200ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: STEP_PRIORITY,
duration: 12 / 60,
easing: "explosive-power", // Explosive acceleration for attacks
},
],
[
AnimationState.HIT,
{
state: AnimationState.HIT,
frames: 4, // 67ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: 6 as AnimationPriority,
duration: 4 / 60,
},
],
[
AnimationState.KO,
{
state: AnimationState.KO,
frames: 30, // 500ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: 7 as AnimationPriority,
duration: 0.5,
},
],
// Fall animations (낙법 애니메이션) - Priority 8 (highest)
[
AnimationState.FALL_FORWARD,
{
state: AnimationState.FALL_FORWARD,
frames: 24, // 400ms at 60fps - stumble forward, knee collapse, hands brace, face-down
fps: 60,
loop: false,
interruptible: false,
priority: 8 as AnimationPriority,
duration: 0.4,
},
],
[
AnimationState.FALL_BACKWARD,
{
state: AnimationState.FALL_BACKWARD,
frames: 30, // 500ms at 60fps - backward stumble, sit, back impact, supine
fps: 60,
loop: false,
interruptible: false,
priority: 8 as AnimationPriority,
duration: 0.5,
},
],
[
AnimationState.FALL_SIDE_LEFT,
{
state: AnimationState.FALL_SIDE_LEFT,
frames: 27, // 450ms at 60fps - rotation, shoulder roll, side sprawl
fps: 60,
loop: false,
interruptible: false,
priority: 8 as AnimationPriority,
duration: 0.45,
},
],
[
AnimationState.FALL_SIDE_RIGHT,
{
state: AnimationState.FALL_SIDE_RIGHT,
frames: 27, // 450ms at 60fps - rotation, shoulder roll, side sprawl
fps: 60,
loop: false,
interruptible: false,
priority: 8 as AnimationPriority,
duration: 0.45,
},
],
// Ground state animations (지면 자세) - Breathing loops
[
AnimationState.GROUND_PRONE,
{
state: AnimationState.GROUND_PRONE,
frames: 4, // Breathing loop on ground (face down)
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
[
AnimationState.GROUND_SUPINE,
{
state: AnimationState.GROUND_SUPINE,
frames: 4, // Breathing loop on ground (face up)
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
[
AnimationState.GROUND_SIDE_LEFT,
{
state: AnimationState.GROUND_SIDE_LEFT,
frames: 4, // Breathing loop on ground (left side)
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
[
AnimationState.GROUND_SIDE_RIGHT,
{
state: AnimationState.GROUND_SIDE_RIGHT,
frames: 4, // Breathing loop on ground (right side)
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
// Recovery animations (기상 애니메이션) - Priority 9 (higher than falls)
[
AnimationState.RECOVERY_PRONE_STANDUP,
{
state: AnimationState.RECOVERY_PRONE_STANDUP,
frames: 30, // 500ms at 60fps - push up from prone, rise to standing
fps: 60,
loop: false,
interruptible: false, // Last 6 frames (100ms) are interruptible
priority: 9 as AnimationPriority,
duration: 0.5,
},
],
[
AnimationState.RECOVERY_SUPINE_STANDUP,
{
state: AnimationState.RECOVERY_SUPINE_STANDUP,
frames: 36, // 600ms at 60fps - sit up, roll forward, stand
fps: 60,
loop: false,
interruptible: false, // Last 6 frames (100ms) are interruptible
priority: 9 as AnimationPriority,
duration: 0.6,
},
],
[
AnimationState.RECOVERY_ROLL,
{
state: AnimationState.RECOVERY_ROLL,
frames: 24, // 400ms at 60fps - roll to side, spring to feet (quick recovery)
fps: 60,
loop: false,
interruptible: false, // Last 6 frames (100ms) are interruptible
priority: 9 as AnimationPriority,
duration: 0.4,
},
],
[
AnimationState.RECOVERY_DEFENSIVE,
{
state: AnimationState.RECOVERY_DEFENSIVE,
frames: 42, // 700ms at 60fps - slow rise with guard up (vulnerable but defended)
fps: 60,
loop: false,
interruptible: false, // Last 6 frames (100ms) are interruptible
priority: 9 as AnimationPriority,
duration: 0.7,
},
],
// 180-degree turn animations (180도 회전 애니메이션)
[
AnimationState.TURN_LEFT,
{
state: AnimationState.TURN_LEFT,
frames: 12, // 200ms at 60fps for 180° turn
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY, // Same priority as attacks/steps - committed action
duration: 12 / 60,
},
],
[
AnimationState.TURN_RIGHT,
{
state: AnimationState.TURN_RIGHT,
frames: 12, // 200ms at 60fps for 180° turn
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY, // Same priority as attacks/steps - committed action
duration: 12 / 60,
},
],
// Stance-specific guard animations (팔괘 방어 자세)
[
AnimationState.STANCE_GUARD_GEON,
{
state: AnimationState.STANCE_GUARD_GEON,
frames: 6, // Breathing animation
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 6 / 60,
},
],
[
AnimationState.STANCE_GUARD_TAE,
{
state: AnimationState.STANCE_GUARD_TAE,
frames: 6, // Breathing animation
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 6 / 60,
},
],
[
AnimationState.STANCE_GUARD_LI,
{
state: AnimationState.STANCE_GUARD_LI,
frames: 4, // Controlled breathing
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
[
AnimationState.STANCE_GUARD_JIN,
{
state: AnimationState.STANCE_GUARD_JIN,
frames: 5, // Deep breathing
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 5 / 60,
},
],
[
AnimationState.STANCE_GUARD_SON,
{
state: AnimationState.STANCE_GUARD_SON,
frames: 6, // Rhythmic breathing
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 6 / 60,
},
],
[
AnimationState.STANCE_GUARD_GAM,
{
state: AnimationState.STANCE_GUARD_GAM,
frames: 6, // Flowing breathing
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 6 / 60,
},
],
[
AnimationState.STANCE_GUARD_GAN,
{
state: AnimationState.STANCE_GUARD_GAN,
frames: 4, // Steady breathing
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 4 / 60,
},
],
[
AnimationState.STANCE_GUARD_GON,
{
state: AnimationState.STANCE_GUARD_GON,
frames: 5, // Deep diaphragm breathing
fps: 60,
loop: true,
interruptible: true,
priority: 0 as AnimationPriority,
duration: 5 / 60,
},
],
// Tactical step animations (전술적 발걸음)
// 18 frames = 300ms at 60fps, 30cm distance per step
[
AnimationState.STEP_FORWARD,
{
state: AnimationState.STEP_FORWARD,
frames: 18,
fps: 60,
loop: false,
interruptible: false, // Non-interruptible for commitment
priority: STEP_PRIORITY,
duration: 0.3,
},
],
[
AnimationState.STEP_BACK,
{
state: AnimationState.STEP_BACK,
frames: 18,
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
[
AnimationState.STEP_LEFT,
{
state: AnimationState.STEP_LEFT,
frames: 18,
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
[
AnimationState.STEP_RIGHT,
{
state: AnimationState.STEP_RIGHT,
frames: 18,
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
[
AnimationState.STEP_FORWARD_LEFT,
{
state: AnimationState.STEP_FORWARD_LEFT,
frames: 18,
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
[
AnimationState.STEP_FORWARD_RIGHT,
{
state: AnimationState.STEP_FORWARD_RIGHT,
frames: 18,
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
[
AnimationState.STEP_BACK_LEFT,
{
state: AnimationState.STEP_BACK_LEFT,
frames: 18,
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
[
AnimationState.STEP_BACK_RIGHT,
{
state: AnimationState.STEP_BACK_RIGHT,
frames: 18,
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
// Footwork patterns (보법) - Korean martial arts specialized footwork
// Circular step (원형보) - Lateral movement maintaining guard facing
[
AnimationState.FOOTWORK_CIRCULAR_LEFT,
{
state: AnimationState.FOOTWORK_CIRCULAR_LEFT,
frames: 18, // 300ms at 60fps
fps: 60,
loop: false,
interruptible: false, // Committed footwork
priority: STEP_PRIORITY, // Same as tactical steps
duration: 0.3,
},
],
[
AnimationState.FOOTWORK_CIRCULAR_RIGHT,
{
state: AnimationState.FOOTWORK_CIRCULAR_RIGHT,
frames: 18, // 300ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.3,
},
],
// Pivot step (축족회전) - Rotation on planted foot
[
AnimationState.FOOTWORK_PIVOT_LEFT,
{
state: AnimationState.FOOTWORK_PIVOT_LEFT,
frames: 15, // 250ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.25,
},
],
[
AnimationState.FOOTWORK_PIVOT_RIGHT,
{
state: AnimationState.FOOTWORK_PIVOT_RIGHT,
frames: 15, // 250ms at 60fps
fps: 60,
loop: false,
interruptible: false,
priority: STEP_PRIORITY,
duration: 0.25,
},
],
// Slide step (미끄럼보) - Both feet move together
[
AnimationState.FOOTWORK_SLIDE_FORWARD,
{
state: AnimationState.FOOTWORK_SLIDE_FORWARD,
frames: 12, // 200ms at 60fps
fps: 60,
loop: false,
interruptible: true, // Can be interrupted
priority: 4 as AnimationPriority, // Same as defend
duration: 0.2,
},
],
[
AnimationState.FOOTWORK_SLIDE_BACK,
{
state: AnimationState.FOOTWORK_SLIDE_BACK,
frames: 12, // 200ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: 4 as AnimationPriority,
duration: 0.2,
},
],
[
AnimationState.FOOTWORK_SLIDE_LEFT,
{
state: AnimationState.FOOTWORK_SLIDE_LEFT,
frames: 12, // 200ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: 4 as AnimationPriority,
duration: 0.2,
},
],
[
AnimationState.FOOTWORK_SLIDE_RIGHT,
{
state: AnimationState.FOOTWORK_SLIDE_RIGHT,
frames: 12, // 200ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: 4 as AnimationPriority,
duration: 0.2,
},
],
// Shuffle step (섞음보) - Quick micro-adjustment
[
AnimationState.FOOTWORK_SHUFFLE,
{
state: AnimationState.FOOTWORK_SHUFFLE,
frames: 6, // 100ms at 60fps
fps: 60,
loop: false,
interruptible: true,
priority: 3 as AnimationPriority, // Same as stance_change
duration: 0.1,
},
],
]);
/**
* 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 {
/**
* Static mapping from TrigramStance to guard AnimationState
* Prevents repeated object allocation in transitionToStanceGuard()
* @korean 자세방어상태맵
*/
private static readonly GUARD_STATE_MAP: Record<TrigramStance, AnimationState> = {
[TrigramStance.GEON]: AnimationState.STANCE_GUARD_GEON,
[TrigramStance.TAE]: AnimationState.STANCE_GUARD_TAE,
[TrigramStance.LI]: AnimationState.STANCE_GUARD_LI,
[TrigramStance.JIN]: AnimationState.STANCE_GUARD_JIN,
[TrigramStance.SON]: AnimationState.STANCE_GUARD_SON,
[TrigramStance.GAM]: AnimationState.STANCE_GUARD_GAM,
[TrigramStance.GAN]: AnimationState.STANCE_GUARD_GAN,
[TrigramStance.GON]: AnimationState.STANCE_GUARD_GON,
};
/**
* Static reverse mapping from guard AnimationState to TrigramStance
* Prevents repeated object allocation in getCurrentGuardStance()
* @korean 방어상태자세맵
*/
private static readonly STANCE_FROM_GUARD_MAP: Record<string, TrigramStance> = {
[AnimationState.STANCE_GUARD_GEON]: TrigramStance.GEON,
[AnimationState.STANCE_GUARD_TAE]: TrigramStance.TAE,
[AnimationState.STANCE_GUARD_LI]: TrigramStance.LI,
[AnimationState.STANCE_GUARD_JIN]: TrigramStance.JIN,
[AnimationState.STANCE_GUARD_SON]: TrigramStance.SON,
[AnimationState.STANCE_GUARD_GAM]: TrigramStance.GAM,
[AnimationState.STANCE_GUARD_GAN]: TrigramStance.GAN,
[AnimationState.STANCE_GUARD_GON]: TrigramStance.GON,
};
private currentState: AnimationState = AnimationState.IDLE;
private frameIndex = 0;
private timeAccumulator = 0;
private previousState: AnimationState | null = null;
private justStarted = false;
private justCompleted = false;
/**
* Current stance transition data (null when not in stance_change animation)
*
* **Korean**: 현재 자세 전환 데이터
*
* Tracks the active stance transition for use during stance_change animation.
* Provides access to keyframes and blend weights for smooth interpolation.
*
* @korean 현재자세전환데이터
*/
private currentStanceTransition: StanceTransition | null = null;
/**
* Motion prediction state for latency reduction
*
* **Korean**: 동작 예측 상태
*
* Tracks animation velocities for motion prediction to reduce perceived latency.
* Updated each frame with velocity calculations for smooth anticipation.
*
* @korean 동작예측상태
*/
private motionPrediction: MotionPredictionState = createMotionPredictionState();
/**
* Enable motion prediction for latency reduction
*
* **Korean**: 동작 예측 활성화
*
* When enabled, predicts future animation frames based on current velocity
* to reduce perceived input latency by 16-33ms (1-2 frames at 60fps).
*
* @korean 동작예측활성화
*/
private enableMotionPrediction: boolean = false;
/**
* Motion prediction time ahead (seconds)
*
* **Korean**: 예측 시간
*
* How far ahead to predict motion (default: 1 frame = 16.67ms at 60fps).
* Typical range: 0.016-0.033 seconds for <50ms total latency.
*
* @korean 예측시간
*/
private predictionTimeAhead: number = 0.01667; // 1 frame at 60fps
/**
* Previous keyframe for motion prediction velocity calculation
*
* **Korean**: 이전 키프레임
*
* @korean 이전키프레임
*/
private previousKeyframe: AnimationKeyframe | null = null;
/**
* Preferred easing function for smooth transitions
*
* **Korean**: 선호 이징 함수
*
* Default easing curve for animation blending and transitions.
* Can be overridden per animation or transition.
*
* @korean 선호이징함수
*/
private preferredEasing: EasingName = "natural-motion";
/**
* 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 logic
// Fall animations transition to ground states using the mapping
if (this.currentState.startsWith("fall_")) {
const fallType = this.currentState.replace("fall_", "");
// Validate that fallType is a valid FallType before using in map
if (fallType === "forward" || fallType === "backward" ||
fallType === "side_left" || fallType === "side_right") {
const groundState = FALL_TO_GROUND_MAP[fallType as FallType];
const groundAnimKey = `ground_${groundState}`;
// Validate that the constructed ground animation state actually exists
if (DEFAULT_ANIMATION_CONFIGS.has(groundAnimKey as AnimationState)) {
const groundAnimState = groundAnimKey as AnimationState;
this.previousState = this.currentState;
this.currentState = groundAnimState;
this.frameIndex = 0;
this.timeAccumulator = 0;
this.justStarted = true;
Eif (this.events?.onAnimationStart) {
this.events.onAnimationStart(groundAnimState);
}
} else E{
// Fallback: if mapping is invalid, safely transition to idle
// instead of entering an undefined animation state.
console.warn(
"[AnimationStateMachine] Invalid ground animation mapping for fall type:",
fallType,
"->",
groundAnimKey
);
this.previousState = this.currentState;
this.currentState = AnimationState.IDLE;
this.frameIndex = 0;
this.timeAccumulator = 0;
this.justStarted = true;
if (this.events?.onAnimationStart) {
this.events.onAnimationStart(AnimationState.IDLE);
}
}
} else E{
// Invalid fall type - fallback to idle
console.warn(
"[AnimationStateMachine] Invalid fall animation state:",
this.currentState
);
this.previousState = this.currentState;
this.currentState = AnimationState.IDLE;
this.frameIndex = 0;
this.timeAccumulator = 0;
this.justStarted = true;
if (this.events?.onAnimationStart) {
this.events.onAnimationStart(AnimationState.IDLE);
}
}
}
// Recovery animations transition to idle when complete
else if (this.currentState.startsWith("recovery_")) {
this.previousState = this.currentState;
this.currentState = AnimationState.IDLE;
this.frameIndex = 0;
this.timeAccumulator = 0;
this.justStarted = true;
Eif (this.events?.onAnimationStart) {
this.events.onAnimationStart(AnimationState.IDLE);
}
}
// Non-fall, non-recovery, non-looping animations transition to idle
else if (this.currentState !== AnimationState.IDLE &&
this.currentState !== AnimationState.KO &&
!this.currentState.startsWith("ground_")) {
// Clear stance transition data if completing stance_change
if (this.currentState === AnimationState.STANCE_CHANGE) {
this.clearStanceTransition();
}
// Direct transition to idle without interrupt event
this.previousState = this.currentState;
this.currentState = AnimationState.IDLE;
this.frameIndex = 0;
this.timeAccumulator = 0;
this.justStarted = true;
if (this.events?.onAnimationStart) {
this.events.onAnimationStart(AnimationState.IDLE);
}
} else E{
// Stay on last frame (for ko and ground states)
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
if (
currentAnim &&
!canInterrupt(this.currentState, newState, currentAnim.interruptible)
) {
return false;
}
// Emit interrupt event if current animation wasn't completed
if (this.frameIndex < (currentAnim?.frames ?? 0) - 1) {
if (this.events?.onAnimationInterrupted) {
this.events.onAnimationInterrupted(this.currentState, newState);
}
}
// Clear stance transition data if interrupting stance_change
if (this.currentState === AnimationState.STANCE_CHANGE) {
this.clearStanceTransition();
}
// 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 = AnimationState.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,
};
}
/**
* Transition to stance-specific guard animation
*
* Convenience method to transition to a stance guard based on trigram stance.
* Automatically maps trigram stance to corresponding guard animation state.
*
* @param stance - Trigram stance identifier
* @returns Whether transition was successful
*
* @example
* ```typescript
* // When player changes to Fire stance
* machine.transitionToStanceGuard(TrigramStance.LI);
* // Internally transitions to "stance_guard_li" animation state
* ```
*
* @korean 자세방어전환
*/
transitionToStanceGuard(stance: TrigramStance): boolean {
const guardAnimationState = PlayerAnimationStateMachine.GUARD_STATE_MAP[stance];
// Verify the guard animation exists in our configs
if (!guardAnimationState || !this.animations.has(guardAnimationState)) {
console.warn(`No guard animation configured for stance: ${stance}`);
return false;
}
return this.transitionTo(guardAnimationState);
}
/**
* Check if current animation is a stance guard
*
* @returns True if currently in a stance guard animation
* @korean 자세방어상태확인
*/
isInStanceGuard(): boolean {
return this.currentState.startsWith("stance_guard_");
}
/**
* Get current guard stance if in a guard animation
*
* @returns Trigram stance or null if not in guard
* @korean 현재방어자세가져오기
*/
getCurrentGuardStance(): TrigramStance | null {
if (!this.isInStanceGuard()) {
return null;
}
const stance = PlayerAnimationStateMachine.STANCE_FROM_GUARD_MAP[this.currentState];
// Validate that we got a valid stance
Iif (!stance) {
console.warn(`Invalid guard state detected: ${this.currentState}`);
return null;
}
return stance;
}
/**
* Transition to stance_change animation with specific stance transition data
*
* **Korean**: 자세 전환 애니메이션 시작
*
* Initiates a stance change animation with the specific transition data
* from the 64-transition matrix. This provides stance-specific keyframes
* and blend weights for smooth interpolation.
*
* @param fromStance - Source trigram stance
* @param toStance - Target trigram stance
* @returns Whether transition was successful
*
* @example
* ```typescript
* // Start transition from Heaven to Lake stance
* const success = machine.transitionToStanceChange(
* TrigramStance.GEON,
* TrigramStance.TAE
* );
*
* if (success) {
* // During update loop, use getStanceTransitionBlend() to interpolate
* const blend = machine.getStanceTransitionBlend();
* if (blend) {
* // Apply blend weights to stance poses
* applyStanceBlend(blend);
* }
* }
* ```
*
* @korean 자세전환애니메이션시작
*/
transitionToStanceChange(
fromStance: TrigramStance,
toStance: TrigramStance
): boolean {
// Get the specific transition data from the 64-transition matrix
const transitionData = getStanceTransition(fromStance, toStance);
Iif (!transitionData) {
console.warn(
`[AnimationStateMachine] No transition data found for ${fromStance} -> ${toStance}`
);
return false;
}
// Store current transition data in case we need to restore it
const previousTransitionData = this.currentStanceTransition;
// Temporarily set the new transition data
this.currentStanceTransition = transitionData;
// Initiate the stance_change animation
const success = this.transitionTo(AnimationState.STANCE_CHANGE);
// If transition failed, restore previous transition data
if (!success) {
this.currentStanceTransition = previousTransitionData;
}
return success;
}
/**
* Get current stance transition data
*
* **Korean**: 현재 자세 전환 데이터 가져오기
*
* Returns the active stance transition data during stance_change animation.
* Null if not currently in a stance transition.
*
* @returns Current stance transition or null
*
* @korean 현재자세전환데이터가져오기
*/
getCurrentStanceTransition(): StanceTransition | null {
return this.currentStanceTransition;
}
/**
* Get interpolated blend weights for current stance transition frame
*
* **Korean**: 현재 프레임 블렌드 가중치
*
* Returns the interpolated blend data for the current frame during
* stance_change animation. Uses the keyframe data from the transition
* matrix to provide smooth stance interpolation.
*
* @returns Blend data with stance and weight, or null if not in transition
*
* @example
* ```typescript
* // In rendering loop during stance transition
* const blend = machine.getStanceTransitionBlend();
* if (blend) {
* console.log(`Frame ${blend.frame}: ${blend.stance} at ${blend.blend}x weight`);
* // Apply blended pose: blend.blend * targetPose + (1 - blend.blend) * sourcePose
* }
* ```
*
* @korean 현재프레임블렌드가중치
*/
getStanceTransitionBlend(): {
frame: number;
stance: TrigramStance | 'neutral';
blend: number;
} | null {
// Only valid during stance_change animation
if (this.currentState !== AnimationState.STANCE_CHANGE || !this.currentStanceTransition) {
return null;
}
const keyframes = this.currentStanceTransition.keyframes;
const currentFrame = this.frameIndex;
// Find the two keyframes to interpolate between
let prevKeyframe = keyframes[0];
let nextKeyframe = keyframes[keyframes.length - 1];
for (let i = 0; i < keyframes.length - 1; i++) {
if (keyframes[i].frame <= currentFrame && keyframes[i + 1].frame > currentFrame) {
prevKeyframe = keyframes[i];
nextKeyframe = keyframes[i + 1];
break;
}
}
// If we're exactly on a keyframe, return it directly
const exactKeyframe = keyframes.find(kf => kf.frame === currentFrame);
if (exactKeyframe) {
return {
frame: currentFrame,
stance: exactKeyframe.stance,
blend: exactKeyframe.blend,
};
}
// Linear interpolation between keyframes
const frameRange = nextKeyframe.frame - prevKeyframe.frame;
const frameProgress = frameRange > 0
? (currentFrame - prevKeyframe.frame) / frameRange
: 0;
const interpolatedBlend =
prevKeyframe.blend + (nextKeyframe.blend - prevKeyframe.blend) * frameProgress;
// Use the next keyframe's stance as we're transitioning towards it
return {
frame: currentFrame,
stance: nextKeyframe.stance,
blend: interpolatedBlend,
};
}
/**
* Check if currently in a stance transition animation
*
* **Korean**: 자세 전환 중 확인
*
* @returns True if currently executing a stance_change animation
* @korean 자세전환중확인
*/
isInStanceTransition(): boolean {
return this.currentState === AnimationState.STANCE_CHANGE && this.currentStanceTransition !== null;
}
/**
* Clear stance transition data (called automatically when transition completes)
*
* **Korean**: 자세 전환 데이터 초기화
*
* @internal
* @korean 자세전환데이터초기화
*/
private clearStanceTransition(): void {
this.currentStanceTransition = null;
}
/**
* Enable or disable motion prediction
*
* **Korean**: 동작 예측 설정
*
* Enables motion prediction to reduce perceived input latency by predicting
* future animation frames based on current velocity (1-2 frames ahead).
*
* @param enabled - Whether to enable motion prediction
* @param predictionTime - Optional: time ahead to predict (default: 16.67ms)
*
* @example
* ```typescript
* // Enable motion prediction for 1 frame (16.67ms at 60fps)
* machine.setMotionPrediction(true);
*
* // Enable with 2 frames prediction (33.33ms)
* machine.setMotionPrediction(true, 0.03333);
* ```
*
* @korean 동작예측설정
*/
setMotionPrediction(enabled: boolean, predictionTime?: number): void {
this.enableMotionPrediction = enabled;
if (predictionTime !== undefined) {
// Clamp to 50ms maximum for <50ms total latency
this.predictionTimeAhead = Math.min(predictionTime, 0.05);
}
}
/**
* Get motion prediction state
*
* **Korean**: 동작 예측 상태 가져오기
*
* @returns Current motion prediction state
* @korean 동작예측상태가져오기
*/
getMotionPredictionState(): MotionPredictionState {
return this.motionPrediction;
}
/**
* Check if motion prediction is enabled
*
* **Korean**: 동작 예측 활성화 확인
*
* @returns True if motion prediction is enabled
* @korean 동작예측활성화확인
*/
isMotionPredictionEnabled(): boolean {
return this.enableMotionPrediction;
}
/**
* Set preferred easing function for transitions
*
* **Korean**: 선호 이징 함수 설정
*
* Sets the default easing curve for animation transitions.
* Can use presets like "natural-motion", "smooth-transition", etc.
*
* @param easingName - Easing function name
*
* @example
* ```typescript
* // Use natural motion for Korean martial arts
* machine.setPreferredEasing("natural-motion");
*
* // Use explosive power for strike animations
* machine.setPreferredEasing("explosive-power");
* ```
*
* @korean 선호이징함수설정
*/
setPreferredEasing(easingName: EasingName): void {
this.preferredEasing = easingName;
}
/**
* Get preferred easing function
*
* **Korean**: 선호 이징 함수 가져오기
*
* @returns Current preferred easing name
* @korean 선호이징함수가져오기
*/
getPreferredEasing(): EasingName {
return this.preferredEasing;
}
/**
* Update motion prediction with skeletal keyframe data
*
* **Korean**: 동작 예측 업데이트
*
* This should be called from the skeletal animation layer when applying
* interpolated keyframes to the rig. It updates velocity tracking for
* motion prediction to reduce perceived latency.
*
* Integration point: Call this from your skeletal animation system after
* computing the current interpolated keyframe (e.g., from getInterpolatedKeyframe).
*
* @param currentKeyframe - Current skeletal animation keyframe with bone positions/rotations
* @param deltaTime - Time elapsed since last update
*
* @example
* ```typescript
* // In your skeletal animation update loop:
* const currentKeyframe = getInterpolatedKeyframe(animation, time);
*
* // Update motion prediction (for next frame)
* if (machine.isMotionPredictionEnabled()) {
* machine.updateMotionPredictionState(currentKeyframe, deltaTime);
* }
*
* // Apply keyframe to rig
* applyKeyframeToRig(rig, currentKeyframe);
* ```
*
* @korean 동작예측업데이트
*/
updateMotionPredictionState(currentKeyframe: AnimationKeyframe, deltaTime: number): void {
Iif (!this.enableMotionPrediction) {
return;
}
// Update velocity tracking if we have a previous keyframe
if (this.previousKeyframe) {
this.motionPrediction = updateMotionPrediction(
this.motionPrediction,
this.previousKeyframe,
currentKeyframe,
deltaTime
);
}
// Store current keyframe for next update
this.previousKeyframe = currentKeyframe;
}
/**
* Get predicted future keyframe for latency reduction
*
* **Korean**: 예측된 미래 키프레임 가져오기
*
* Returns a keyframe predicted ahead by predictionTimeAhead (default: 1 frame).
* This reduces perceived input latency by showing where the animation will be
* in the near future rather than where it currently is.
*
* Integration point: Use this instead of the current keyframe when applying
* to the rig if motion prediction is enabled.
*
* @param currentKeyframe - Current skeletal animation keyframe
* @returns Predicted future keyframe, or current if prediction disabled
*
* @example
* ```typescript
* // In your skeletal animation update loop:
* let keyframeToApply = currentKeyframe;
*
* if (machine.isMotionPredictionEnabled()) {
* keyframeToApply = machine.getPredictedKeyframe(currentKeyframe);
* }
*
* applyKeyframeToRig(rig, keyframeToApply);
* ```
*
* @korean 예측키프레임가져오기
*/
getPredictedKeyframe(currentKeyframe: AnimationKeyframe): AnimationKeyframe {
if (!this.enableMotionPrediction || !this.previousKeyframe) {
return currentKeyframe;
}
return predictFutureKeyframe(
currentKeyframe,
this.motionPrediction,
this.predictionTimeAhead
);
}
}
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