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* Recovery Animation System for Black Trigram
*
* Implements realistic recovery animations for standing up from fallen states.
* Based on Korean martial arts recovery techniques (기상 - Gisang).
*
* @module systems/animation/RecoveryAnimations
* @category Animation
* @korean 기상애니메이션
*/
import type { RecoveryAnimationType, GroundState } from "./types";
import { GROUND_STATE_TO_RECOVERY, RECOVERY_TYPE_TO_ANIMATION } from "./types";
/**
* Recovery animation keyframe data structure
*
* Defines key poses during recovery animations for skeletal rendering.
* Each keyframe specifies body positions at critical moments.
*
* @korean 기상키프레임
*/
export interface RecoveryKeyframe {
/** Frame number (0-indexed) */
readonly frame: number;
/** Torso rotation (radians) */
readonly torsoRotation: { x: number; y: number; z: number };
/** Center of mass vertical position (0-1, 1=standing, 0=ground) */
readonly centerOfMassHeight: number;
/** Description of this keyframe */
readonly description: {
readonly korean: string;
readonly english: string;
};
/** Whether player is vulnerable at this frame */
readonly vulnerable: boolean;
}
/**
* Prone stand-up keyframes (엎드린 기상)
*
* 30 frames (500ms) sequence:
* - Frames 0-8: Push up with hands, torso lifts
* - Frames 9-18: Legs swing under body, kneeling position
* - Frames 19-24: Rise from kneeling to standing (vulnerable)
* - Frames 25-29: Final stance adjustment (interruptible)
*
* @korean 엎드린기상키프레임
*/
export const RECOVERY_PRONE_KEYFRAMES: readonly RecoveryKeyframe[] = [
{
frame: 0,
torsoRotation: { x: 1.57, y: 0, z: 0 }, // Face down (90° forward)
centerOfMassHeight: 0.05,
description: {
korean: "엎드린 자세",
english: "Prone position",
},
vulnerable: true,
},
{
frame: 8,
torsoRotation: { x: 1.2, y: 0, z: 0 }, // Hands pushing, torso lifting
centerOfMassHeight: 0.2,
description: {
korean: "손으로 밀어 올리기",
english: "Hands push up torso",
},
vulnerable: true,
},
{
frame: 18,
torsoRotation: { x: 0.7, y: 0, z: 0 }, // Kneeling position
centerOfMassHeight: 0.5,
description: {
korean: "무릎 꿇기",
english: "Kneeling position",
},
vulnerable: true,
},
{
frame: 24,
torsoRotation: { x: 0.2, y: 0, z: 0 }, // Rising to standing
centerOfMassHeight: 0.75,
description: {
korean: "일어서기",
english: "Rising to standing",
},
vulnerable: false, // Last 6 frames (24-30) entering safe zone
},
{
frame: 29,
torsoRotation: { x: 0, y: 0, z: 0 }, // Standing (interruptible)
centerOfMassHeight: 0.9,
description: {
korean: "서 있는 자세",
english: "Standing stance",
},
vulnerable: false, // Last 6 frames (25-30) are not vulnerable
},
] as const;
/**
* Supine stand-up keyframes (누운 기상)
*
* 36 frames (600ms) sequence:
* - Frames 0-10: Abs crunch sit-up motion
* - Frames 11-22: Forward roll onto feet
* - Frames 23-30: Feet plant, rise to standing (vulnerable)
* - Frames 31-35: Final stance adjustment (interruptible)
*
* @korean 누운기상키프레임
*/
export const RECOVERY_SUPINE_KEYFRAMES: readonly RecoveryKeyframe[] = [
{
frame: 0,
torsoRotation: { x: -1.57, y: 0, z: 0 }, // Face up (90° back)
centerOfMassHeight: 0.05,
description: {
korean: "누운 자세",
english: "Supine position",
},
vulnerable: true,
},
{
frame: 10,
torsoRotation: { x: -0.9, y: 0, z: 0 }, // Sit-up motion
centerOfMassHeight: 0.3,
description: {
korean: "윗몸 일으키기",
english: "Sit-up motion",
},
vulnerable: true,
},
{
frame: 22,
torsoRotation: { x: 0.4, y: 0, z: 0 }, // Forward roll
centerOfMassHeight: 0.4,
description: {
korean: "전방 구르기",
english: "Forward roll",
},
vulnerable: true,
},
{
frame: 30,
torsoRotation: { x: 0.2, y: 0, z: 0 }, // Feet planted, rising
centerOfMassHeight: 0.7,
description: {
korean: "발 디디고 일어서기",
english: "Feet planted, rising",
},
vulnerable: false, // Last 6 frames (30-36) entering safe zone
},
{
frame: 35,
torsoRotation: { x: 0, y: 0, z: 0 }, // Standing (interruptible)
centerOfMassHeight: 0.9,
description: {
korean: "서 있는 자세",
english: "Standing stance",
},
vulnerable: false, // Last 6 frames (30-36) are not vulnerable
},
] as const;
/**
* Roll recovery keyframes (회전기상)
*
* 24 frames (400ms) sequence - FAST recovery
* - Frames 0-6: Roll to side, momentum building
* - Frames 7-14: Spring to feet with explosive movement
* - Frames 15-18: Quick stance (vulnerable)
* - Frames 19-23: Combat ready (interruptible)
*
* Costs 20 stamina for speed advantage.
*
* @korean 회전기상키프레임
*/
export const RECOVERY_ROLL_KEYFRAMES: readonly RecoveryKeyframe[] = [
{
frame: 0,
torsoRotation: { x: 0, y: 1.57, z: 1.57 }, // Side position (90° roll)
centerOfMassHeight: 0.05,
description: {
korean: "측면 자세",
english: "Side position",
},
vulnerable: true,
},
{
frame: 6,
torsoRotation: { x: 0.3, y: 0.8, z: 0.9 }, // Rolling motion
centerOfMassHeight: 0.25,
description: {
korean: "구르기 움직임",
english: "Rolling motion",
},
vulnerable: true,
},
{
frame: 14,
torsoRotation: { x: 0.4, y: 0, z: 0 }, // Springing to feet
centerOfMassHeight: 0.6,
description: {
korean: "발로 튀어오르기",
english: "Spring to feet",
},
vulnerable: true,
},
{
frame: 18,
torsoRotation: { x: 0.1, y: 0, z: 0 }, // Quick stance
centerOfMassHeight: 0.85,
description: {
korean: "빠른 자세",
english: "Quick stance",
},
vulnerable: false, // Last 6 frames (18-24) entering safe zone
},
{
frame: 23,
torsoRotation: { x: 0, y: 0, z: 0 }, // Combat ready (interruptible)
centerOfMassHeight: 0.9,
description: {
korean: "전투 준비",
english: "Combat ready",
},
vulnerable: false, // Last 6 frames (18-24) are not vulnerable
},
] as const;
/**
* Defensive getup keyframes (방어기상)
*
* 42 frames (700ms) sequence - SLOW but protected
* - Frames 0-14: Slow rise with arms guarding head/torso
* - Frames 15-28: Gradual stand with maintained guard
* - Frames 29-36: Stance formation with guard (50% damage reduction)
* - Frames 37-41: Ready stance (interruptible)
*
* Provides 50% damage reduction throughout animation.
*
* @korean 방어기상키프레임
*/
export const RECOVERY_DEFENSIVE_KEYFRAMES: readonly RecoveryKeyframe[] = [
{
frame: 0,
torsoRotation: { x: 1.2, y: 0, z: 0 }, // Grounded, arms up
centerOfMassHeight: 0.05,
description: {
korean: "지면에서 팔 올리기",
english: "Grounded, arms up",
},
vulnerable: true, // 50% damage reduction applies
},
{
frame: 14,
torsoRotation: { x: 0.9, y: 0, z: 0 }, // Slow rise, guard maintained
centerOfMassHeight: 0.3,
description: {
korean: "천천히 일어나며 방어",
english: "Slow rise, guarded",
},
vulnerable: true, // 50% damage reduction applies
},
{
frame: 28,
torsoRotation: { x: 0.5, y: 0, z: 0 }, // Gradual stand, guard up
centerOfMassHeight: 0.6,
description: {
korean: "점차 서며 방어 유지",
english: "Gradual stand, guard up",
},
vulnerable: true, // 50% damage reduction applies
},
{
frame: 36,
torsoRotation: { x: 0.2, y: 0, z: 0 }, // Stance formation, guarded
centerOfMassHeight: 0.8,
description: {
korean: "자세 형성, 방어 상태",
english: "Stance formation, guarded",
},
vulnerable: false, // Last 6 frames (36-42) entering safe zone (still 50% reduction)
},
{
frame: 41,
torsoRotation: { x: 0, y: 0, z: 0 }, // Ready stance (interruptible)
centerOfMassHeight: 0.9,
description: {
korean: "준비 자세",
english: "Ready stance",
},
vulnerable: false, // Last 6 frames (36-42) are not vulnerable
},
] as const;
/**
* Get keyframes for a specific recovery type
*
* @param recoveryType - Type of recovery animation
* @returns Array of keyframes for that recovery type
*
* @public
* @korean 기상키프레임가져오기
*/
export function getRecoveryKeyframes(
recoveryType: RecoveryAnimationType
): readonly RecoveryKeyframe[] {
switch (recoveryType) {
case "prone_standup":
return RECOVERY_PRONE_KEYFRAMES;
case "supine_standup":
return RECOVERY_SUPINE_KEYFRAMES;
case "roll_recovery":
return RECOVERY_ROLL_KEYFRAMES;
case "defensive_getup":
return RECOVERY_DEFENSIVE_KEYFRAMES;
}
}
/**
* Check if a frame in a recovery animation is vulnerable
*
* Vulnerability is determined by keyframe data. The last 6 frames
* of each recovery animation are interruptible and not vulnerable.
*
* @param recoveryType - Type of recovery animation
* @param frame - Current frame number (0-indexed)
* @returns True if player is vulnerable at this frame
*
* @public
* @korean 취약프레임확인
*/
export function isVulnerableFrame(
recoveryType: RecoveryAnimationType,
frame: number
): boolean {
const keyframes = getRecoveryKeyframes(recoveryType);
// Find the keyframe for this frame or the previous keyframe
let currentKeyframe = keyframes[0];
for (const kf of keyframes) {
if (kf.frame <= frame) {
currentKeyframe = kf;
} else {
break;
}
}
return currentKeyframe.vulnerable;
}
/**
* Determine appropriate recovery animation from ground state
*
* Uses ground state to select default recovery animation.
* Side positions default to roll recovery for dynamic movement.
*
* @param groundState - Current ground position
* @returns Default recovery animation type
*
* @example
* ```typescript
* const recoveryType = determineRecoveryType("prone");
* // Returns: "prone_standup"
*
* const sideRecovery = determineRecoveryType("side_left");
* // Returns: "roll_recovery" (default for side positions)
* ```
*
* @public
* @korean 기상유형결정
*/
export function determineRecoveryType(
groundState: GroundState
): RecoveryAnimationType {
return GROUND_STATE_TO_RECOVERY[groundState];
}
/**
* Get recovery animation state from recovery type
*
* @param recoveryType - Recovery animation type
* @returns Animation state name
*
* @public
* @korean 기상애니메이션상태
*/
export function getRecoveryAnimationState(
recoveryType: RecoveryAnimationType
): string {
return RECOVERY_TYPE_TO_ANIMATION[recoveryType];
}
/**
* Recovery animation configuration
*
* Additional properties for recovery animations beyond base AnimationConfig.
*
* @korean 기상설정
*/
export interface RecoveryConfig {
/** Recovery animation type */
readonly type: RecoveryAnimationType;
/** Stamina cost to execute (0 for normal recoveries) */
readonly staminaCost: number;
/** Damage reduction percentage during animation (0-1) */
readonly damageReduction: number;
/** Number of initial vulnerable frames (first N frames are vulnerable to damage) */
readonly vulnerableFrames: number;
/** Frame when player becomes interruptible (last 6 frames typically) */
readonly interruptibleFrame: number;
}
/**
* Recovery animation configurations
*
* Defines stamina costs, damage reduction, and vulnerability windows.
*
* @korean 기상설정맵
*/
export const RECOVERY_CONFIGS: Record<RecoveryAnimationType, RecoveryConfig> = {
prone_standup: {
type: "prone_standup",
staminaCost: 0,
damageReduction: 0,
vulnerableFrames: 24, // Vulnerable for first 24 frames (80%)
interruptibleFrame: 24, // Last 6 frames (25-30) are interruptible
},
supine_standup: {
type: "supine_standup",
staminaCost: 0,
damageReduction: 0,
vulnerableFrames: 30, // Vulnerable for first 30 frames (83%)
interruptibleFrame: 30, // Last 6 frames (30-36) are interruptible
},
roll_recovery: {
type: "roll_recovery",
staminaCost: 20, // Costs stamina for speed
damageReduction: 0,
vulnerableFrames: 18, // Vulnerable for first 18 frames (75%)
interruptibleFrame: 18, // Last 6 frames (18-24) are interruptible
},
defensive_getup: {
type: "defensive_getup",
staminaCost: 0,
damageReduction: 0.5, // 50% damage reduction throughout
vulnerableFrames: 36, // Vulnerable for first 36 frames (86%)
interruptibleFrame: 36, // Last 6 frames (36-42) are interruptible
},
};
/**
* Get recovery configuration
*
* @param recoveryType - Recovery animation type
* @returns Recovery configuration
*
* @public
* @korean 기상설정가져오기
*/
export function getRecoveryConfig(
recoveryType: RecoveryAnimationType
): RecoveryConfig {
return RECOVERY_CONFIGS[recoveryType];
}
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