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* Attack Movement Physics System for realistic forward momentum during attacks.
*
* **Korean**: 공격 이동 물리 시스템 (Attack Movement Physics System)
*
* Implements realistic forward movement physics when fighters execute attacks.
* Kicks naturally extend the body forward, punches lunge with body weight,
* and spinning techniques carry rotational momentum.
*
* ## Attack Movement Mechanics
*
* Forward movement distance is determined by:
* - Animation type (kicks > punches > elbows/knees)
* - Stance modifiers (8 trigram stances affect aggression)
* - Animation phase timing (extension → peak → recovery)
*
* ## Movement Integration
*
* - Extension phase (frames 3-6): Forward lunge with ease-out
* - Peak phase (frame 6): Maximum extension reached
* - Recovery phase (frames 7-10): Return to original stance
* - Arena bounds: Automatically clamp movement to valid zone
*
* ## Performance
*
* Optimized for 60fps with efficient vector calculations and
* smooth easing curves for realistic attack momentum feel.
*
* @module systems/physics/AttackMovementPhysics
* @category Physics System
* @korean 공격이동물리
*/
import * as THREE from "three";
import { TrigramStance } from "@/types/common";
import { AnimationType } from "@/systems/animation";
/**
* Configuration for attack movement calculation.
*
* **Korean**: 공격 이동 설정 (Attack Movement Configuration)
*
* @public
* @korean 공격이동설정
*/
export interface AttackMovementConfig {
/** Animation type being executed */
readonly animationType: AnimationType;
/** Current trigram stance */
readonly currentStance: TrigramStance;
/** Normalized attack direction vector (attacker → target) */
readonly direction: THREE.Vector3;
/** Total attack animation duration in seconds */
readonly animationDuration: number;
}
/**
* Result of attack movement calculation.
*
* **Korean**: 공격 이동 결과 (Attack Movement Result)
*
* Contains displacement vector and timing for attack lunge.
*
* @public
* @korean 공격이동결과
*/
export interface AttackMovementResult {
/** Total forward displacement vector in world space */
readonly displacement: THREE.Vector3;
/** Duration of forward lunge phase in seconds */
readonly lungeDuration: number;
/** Duration of recovery return phase in seconds */
readonly recoveryDuration: number;
/** Total movement cycle duration in seconds */
readonly totalDuration: number;
}
/**
* Attack Movement Physics Engine.
*
* **Korean**: 공격 이동 물리 엔진
*
* Calculates realistic forward movement during attack animations
* based on technique type, stance modifiers, and animation timing.
* Provides smooth lunge and recovery phases for authentic martial arts feel.
*
* @example
* ```typescript
* const physics = new AttackMovementPhysics();
*
* // Calculate movement for roundhouse kick
* const config: AttackMovementConfig = {
* animationType: AnimationType.ROUNDHOUSE_KICK,
* currentStance: TrigramStance.LI, // Fire stance (aggressive)
* direction: new THREE.Vector3(1, 0, 0).normalize(),
* animationDuration: 0.48, // 480ms kick animation
* };
*
* const result = physics.calculateAttackMovement(config);
* // Result: 1.0m base * 1.3 (Fire bonus) = ~1.3m forward lunge
* // lungeDuration: 0.24s (50% of animation)
* // recoveryDuration: 0.24s (50% of animation)
* ```
*
* @public
* @korean 공격이동물리
*/
export class AttackMovementPhysics {
/**
* Calculates attack movement displacement and timing.
*
* **Korean**: 공격 이동 계산 (Calculate Attack Movement)
*
* Determines forward lunge distance and recovery timing based on:
* 1. Base movement from animation type
* 2. Stance movement modifier (8 trigram effects)
* 3. Animation phase durations (lunge vs recovery)
*
* @param config - Attack movement configuration
* @returns Attack movement result with displacement and timing
*
* @example
* ```typescript
* // Front kick with Heaven stance
* const kick = physics.calculateAttackMovement({
* animationType: AnimationType.FRONT_KICK,
* currentStance: TrigramStance.GEON,
* direction: attackVector,
* animationDuration: 0.4,
* });
* // Result: ~0.88m forward (0.8m * 1.1 Geon modifier)
*
* // Jab with Mountain stance
* const jab = physics.calculateAttackMovement({
* animationType: AnimationType.JAB,
* currentStance: TrigramStance.GAN,
* direction: attackVector,
* animationDuration: 0.25,
* });
* // Result: ~0.24m forward (0.3m * 0.8 Gan modifier)
* ```
*
* @public
* @korean 공격이동계산
*/
calculateAttackMovement(
config: AttackMovementConfig
): AttackMovementResult {
// 1. Get base movement distance for animation type
const baseDistance = this.getBaseMovementDistance(config.animationType);
// 2. Apply stance movement modifier
const stanceModifier = this.getStanceMovementModifier(config.currentStance);
const finalDistance = baseDistance * stanceModifier;
// 3. Calculate displacement vector
const displacement = config.direction.clone().multiplyScalar(finalDistance);
// 4. Calculate phase durations (lunge + recovery)
const lungeDuration = config.animationDuration * 0.5; // First 50% = forward
const recoveryDuration = config.animationDuration * 0.5; // Last 50% = return
return {
displacement,
lungeDuration,
recoveryDuration,
totalDuration: config.animationDuration,
};
}
/**
* Gets base forward movement distance for animation type.
*
* **Korean**: 기본 이동 거리 (Base Movement Distance)
*
* Movement distances by technique category:
* - Kicks: 0.8-1.2m (leg extension, longest reach)
* - Punches: 0.3-0.5m (arm extension, body lunge)
* - Elbows/Knees: 0.2-0.3m (close range techniques)
* - Spinning: 0.5-0.8m (rotation carries momentum)
*
* @param animationType - Type of attack animation
* @returns Base movement distance in meters
*
* @private
* @korean 기본이동거리
*/
private getBaseMovementDistance(animationType: AnimationType): number {
// Kicks - highest forward movement (leg extension)
if (
animationType === AnimationType.ROUNDHOUSE_KICK ||
animationType === AnimationType.SIDE_KICK ||
animationType === AnimationType.BACK_KICK
) {
return 1.0; // 1.0m forward lunge
}
if (
animationType === AnimationType.FRONT_KICK ||
animationType === AnimationType.PUSH_KICK
) {
return 0.8; // 0.8m forward lunge
}
if (
animationType === AnimationType.AXE_KICK ||
animationType === AnimationType.CRESCENT_KICK ||
animationType === AnimationType.LOW_KICK
) {
return 0.9; // 0.9m forward lunge
}
// Spinning kicks - momentum carries body forward
if (
animationType === AnimationType.SPINNING_HOOK ||
animationType === AnimationType.SPINNING_HEEL_KICK ||
animationType === AnimationType.TORNADO_KICK
) {
return 0.8; // 0.8m with rotation
}
// Jumping/flying kicks - aerial momentum
if (
animationType === AnimationType.FLYING_KICK ||
animationType === AnimationType.JUMPING_KICK
) {
return 1.2; // 1.2m maximum extension
}
// Punches - moderate forward movement (arm + body lunge)
if (
animationType === AnimationType.CROSS ||
animationType === AnimationType.OVERHAND ||
animationType === AnimationType.HOOK
) {
return 0.5; // 0.5m forward lunge
}
if (
animationType === AnimationType.JAB ||
animationType === AnimationType.BACKFIST
) {
return 0.3; // 0.3m forward lunge
}
if (
animationType === AnimationType.UPPERCUT ||
animationType === AnimationType.HAMMER_FIST ||
animationType === AnimationType.PALM_STRIKE
) {
return 0.4; // 0.4m forward lunge
}
// Elbow/Knee - minimal movement (close range)
if (
animationType === AnimationType.ELBOW_STRIKE ||
animationType === AnimationType.KNEE_STRIKE ||
animationType === AnimationType.KNEE_KICK ||
animationType === AnimationType.ELBOW_UPPERCUT ||
animationType === AnimationType.FLYING_KNEE ||
animationType === AnimationType.CLINCH_KNEE ||
animationType === AnimationType.SPINNING_ELBOW ||
animationType === AnimationType.TEMPLE_ELBOW ||
animationType === AnimationType.SPINNING_BACK_ELBOW ||
animationType === AnimationType.SPINAL_ELBOW ||
animationType === AnimationType.BRACHIAL_ELBOW ||
animationType === AnimationType.KIDNEY_KNEE ||
animationType === AnimationType.FEMORAL_KNEE
) {
return 0.2; // 0.2m forward lunge
}
// Specialized jab variants - similar to jab (quick extension)
if (
animationType === AnimationType.SPEAR_HAND_STRIKE ||
animationType === AnimationType.NERVE_STRIKE ||
animationType === AnimationType.PRESSURE_POINT_STRIKE ||
animationType === AnimationType.LIGHTNING_STRIKE ||
animationType === AnimationType.RAPID_BARRAGE ||
animationType === AnimationType.RHYTHMIC_STRIKES ||
animationType === AnimationType.NERVE_PARALYSIS ||
animationType === AnimationType.THROAT_STRIKE ||
animationType === AnimationType.EYE_GOUGE
) {
return 0.3; // 0.3m forward lunge (jab-like)
}
// Specialized cross variants - similar to cross (body weight transfer)
if (
animationType === AnimationType.HEAVEN_STRIKE ||
animationType === AnimationType.FLOWING_CROSS
) {
return 0.5; // 0.5m forward lunge (cross-like)
}
// Specialized palm strikes - similar to palm strike
if (
animationType === AnimationType.SOLAR_PLEXUS_STRIKE ||
animationType === AnimationType.FLOWING_PUSH ||
animationType === AnimationType.LIVER_DISRUPTION ||
animationType === AnimationType.EAR_STRIKE
) {
return 0.4; // 0.4m forward lunge (palm-like)
}
// Grappling - minimal forward movement (rotation/off-balancing in place)
if (
animationType === AnimationType.THROW ||
animationType === AnimationType.JOINT_LOCK ||
animationType === AnimationType.TAKEDOWN ||
animationType === AnimationType.SWEEP ||
animationType === AnimationType.CLINCH ||
animationType === AnimationType.GRAPPLE ||
animationType === AnimationType.SLAM ||
animationType === AnimationType.WRIST_LOCK ||
animationType === AnimationType.ARM_BAR ||
animationType === AnimationType.SHOULDER_LOCK ||
animationType === AnimationType.HIP_THROW ||
animationType === AnimationType.LEG_REAP ||
animationType === AnimationType.SMALL_CIRCLE_LOCK ||
animationType === AnimationType.FINGER_LOCK ||
animationType === AnimationType.ELBOW_LOCK ||
animationType === AnimationType.SHOULDER_MANIPULATION ||
animationType === AnimationType.MOUNTAIN_LOCK ||
animationType === AnimationType.EARTH_EMBRACE ||
animationType === AnimationType.CAROTID_CHOKE
) {
return 0.05; // 0.05m forward movement for grappling entries
}
// Default - conservative minimal movement for any unmapped types
// Additional AnimationType values can be grouped with the closest category above
// to fine-tune their forward displacement without changing overall behavior
return 0.2;
}
/**
* Gets stance movement modifier for attack lunge.
*
* **Korean**: 자세 이동 배율 (Stance Movement Modifier)
*
* Trigram stance movement modifiers based on combat philosophy:
* - ☰ 건 (Geon/Heaven): +30% movement (aggressive, drives forward with pure yang)
* - ☳ 진 (Jin/Thunder): +20% movement (explosive power, shocking force)
* - ☴ 손 (Son/Wind): +15% movement (continuous flow, mobile)
* - ☲ 리 (Li/Fire): +10% movement (precision strikes, controlled aggression)
* - ☱ 태 (Tae/Lake): 0% (neutral, fluid and adaptive)
* - ☵ 감 (Gam/Water): 0% (neutral, flowing and flexible)
* - ☷ 곤 (Gon/Earth): -10% movement (grounded, stable techniques)
* - ☶ 간 (Gan/Mountain): -20% movement (defensive mastery, minimal advance)
*
* @param stance - Current trigram stance
* @returns Movement multiplier (0.8 to 1.3)
*
* @private
* @korean 자세이동배율
*/
private getStanceMovementModifier(stance: TrigramStance): number {
const modifiers: Record<TrigramStance, number> = {
[TrigramStance.GEON]: 1.3, // Heaven: +30% aggressive forward pressure (pure yang drives forward)
[TrigramStance.JIN]: 1.2, // Thunder: +20% explosive movement
[TrigramStance.SON]: 1.15, // Wind: +15% flowing movement
[TrigramStance.LI]: 1.1, // Fire: +10% precision strikes with controlled forward movement
[TrigramStance.TAE]: 1.0, // Lake: neutral movement
[TrigramStance.GAM]: 1.0, // Water: neutral movement
[TrigramStance.GON]: 0.9, // Earth: -10% grounded movement
[TrigramStance.GAN]: 0.8, // Mountain: -20% defensive movement
};
return modifiers[stance];
}
/**
* Applies attack movement force to attacker position over time.
*
* **Korean**: 공격 이동 적용 (Apply Attack Movement)
*
* Uses smooth ease-out cubic curve for realistic lunge feel:
* - Fast initial forward movement (attack commitment)
* - Gradual deceleration at peak extension
* - Smooth return during recovery phase
*
* @param basePosition - Original stance position (does not change during attack)
* @param result - Attack movement result with displacement
* @param elapsedTime - Time elapsed since attack started
* @param isRecoveryPhase - Whether in recovery (return) phase
* @returns New position with attack displacement applied
*
* @example
* ```typescript
* // In animation update loop (60fps)
* const basePos = new THREE.Vector3(0, 0, 0); // Original stance position
*
* if (elapsedTime < result.lungeDuration) {
* // Lunge forward phase
* const newPosition = physics.applyAttackMovement(
* basePos,
* result,
* elapsedTime,
* false
* );
* } else if (elapsedTime < result.totalDuration) {
* // Recovery return phase
* const newPosition = physics.applyAttackMovement(
* basePos,
* result,
* elapsedTime,
* true
* );
* }
* ```
*
* @public
* @korean 공격이동적용
*/
applyAttackMovement(
basePosition: THREE.Vector3,
result: AttackMovementResult,
elapsedTime: number,
isRecoveryPhase: boolean
): THREE.Vector3 {
let progress: number;
if (!isRecoveryPhase) {
// Lunge forward phase
progress = Math.min(1.0, elapsedTime / result.lungeDuration);
// Smooth forward lunge curve (ease-out cubic)
// Fast initial commitment, gradual deceleration at peak
const easedProgress = 1 - Math.pow(1 - progress, 3);
// Calculate position along forward path
const currentDisplacement = result.displacement
.clone()
.multiplyScalar(easedProgress);
return basePosition.clone().add(currentDisplacement);
} else {
// Recovery return phase
const recoveryTime = elapsedTime - result.lungeDuration;
progress = Math.min(1.0, recoveryTime / result.recoveryDuration);
// Smooth return curve (ease-in cubic)
// Gradual start, faster finish back to stance
const easedProgress = Math.pow(progress, 3);
// Calculate return position (from peak back to origin)
const returnDisplacement = result.displacement
.clone()
.multiplyScalar(1.0 - easedProgress);
return basePosition.clone().add(returnDisplacement);
}
}
/**
* Checks if attacker is currently in lunge phase.
*
* **Korean**: 돌진 상태 확인 (Check Lunge State)
*
* @param elapsedTime - Time elapsed since attack started
* @param lungeDuration - Total lunge phase duration
* @returns True if in forward lunge phase
*
* @public
* @korean 돌진상태확인
*/
isInLungePhase(elapsedTime: number, lungeDuration: number): boolean {
return elapsedTime < lungeDuration;
}
/**
* Checks if attacker is in recovery return phase.
*
* **Korean**: 회복 상태 확인 (Check Recovery State)
*
* @param elapsedTime - Time elapsed since attack started
* @param result - Attack movement result with timing
* @returns True if in recovery return phase
*
* @public
* @korean 회복상태확인
*/
isInRecoveryPhase(
elapsedTime: number,
result: AttackMovementResult
): boolean {
return (
elapsedTime >= result.lungeDuration &&
elapsedTime < result.totalDuration
);
}
/**
* Gets bilingual Korean-English name for lunge phase.
*
* **Korean**: 돌진 단계 이름 (Lunge Phase Name)
*
* @returns Korean and English phase names
*
* @public
* @korean 돌진단계이름
*/
getLungePhaseName(): { korean: string; english: string } {
return {
korean: "돌진",
english: "Lunge",
};
}
/**
* Gets bilingual Korean-English name for recovery phase.
*
* **Korean**: 복귀 단계 이름 (Recovery Phase Name)
*
* @returns Korean and English phase names
*
* @public
* @korean 복귀단계이름
*/
getRecoveryPhaseName(): { korean: string; english: string } {
return {
korean: "복귀",
english: "Recovery",
};
}
}
export default AttackMovementPhysics;
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