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* Step Animation System for Black Trigram
*
* **PHASE 4 ENHANCEMENT: Advanced Step Techniques**
*
* Implements tactical step movement animations with precise 30cm steps
* based on Korean martial arts footwork (보법, Bobeop).
*
* **Advanced Step Keyframe Definitions (Integration Pending)**:
* - **밀기 스텝 (Push Step)**: Rear foot drives forward for power generation (280ms, 35cm)
* - **당기기 스텝 (Pull Step)**: Front foot pulls back for defensive retreat (260ms, 30cm)
* - **자르기 스텝 (Cut Step)**: Diagonal step for angle creation and evasion (300ms, 32cm)
*
* > **Note**: These advanced step variants have keyframe sets defined but are not yet wired
* > into the main step selection/config APIs (`StepDirection`, `STEP_ANIMATION_CONFIGS`,
* > `createStepConfig`, `getStepKeyframeAtFrame`). They are currently experimental data only.
*
* **Base 8-Direction Steps** (Fully Integrated):
* - Duration: 300ms (18 frames at 60fps)
* - Distance: 30cm (approximately one foot width)
* - Non-interruptible (priority 5, same as attacks)
* - Maintains guard position
* - Smooth weight transfer with Korean martial arts principles
*
* **Korean Footwork Principles Applied**:
* - 디딤발 (Didimbal): Stepping foot lands heel-first forward, ball-first backward
* - 축발 (Chukbal): Pivot foot maintains stability during movement
* - 체중이동 (Chejung Idong): Weight transfers smoothly through phases
* - 각도 만들기 (Gakdo Mandeulgi): Angle creation through diagonal movement
*
* @module systems/animation/StepAnimations
* @category Animation
* @korean 발걸음애니메이션시스템
*/
import type {
AnimationState,
StepConfig,
StepDirection,
StepKeyframe,
} from "../core/types";
import { STEP_PRIORITY } from "../core/types";
/**
* Standard step animation parameters
*
* Based on issue requirements:
* - 18 frames at 60fps = 300ms duration
* - 30cm distance (one foot width)
* - Guard maintained throughout
*
* @korean 표준발걸음파라미터
*/
export const STEP_ANIMATION_PARAMS = {
/** Total frames for step animation */
FRAMES: 18,
/** Target FPS (60 for smooth combat) */
FPS: 60,
/** Duration in seconds (300ms) */
DURATION: 0.3,
/** Distance moved per step in meters (30cm) */
DISTANCE: 0.3,
/** Stamina cost per step - reduced for sustained combat (3 min rounds) */
STAMINA_COST: 3,
/** Whether steps are interruptible (false for commitment) */
INTERRUPTIBLE: false,
/** Animation priority (same as attack) */
PRIORITY: STEP_PRIORITY,
} as const;
/**
* Step keyframes defining weight transfer and foot placement
*
* Four-phase step animation:
* 1. Frames 0-5: Weight shift to back foot (준비, Junbi - Preparation)
* 2. Frames 6-11: Front foot lift and extension (이동, Idong - Movement)
* 3. Frames 12-15: Front foot placement (착지, Chakji - Landing)
* 4. Frames 16-17: Weight settle and stabilize (안정, Anjeong - Stabilization)
*
* @korean 발걸음키프레임
*/
export const STEP_KEYFRAMES: readonly StepKeyframe[] = [
// Phase 1: Preparation (frames 0-5)
{
frame: 0,
weight: 0.5, // Balanced starting position
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: 0,
},
{
frame: 3,
weight: 0.3, // Shift weight to back foot
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: -0.01, // Slight crouch for power
},
// Phase 2: Movement (frames 6-11)
{
frame: 6,
weight: 0.2, // Mostly on back foot
frontFootOffset: 0.1,
backFootOffset: 0,
frontFootLift: 0.05, // Lift front foot
cogHeight: -0.01,
},
{
frame: 9,
weight: 0.3, // Begin weight transfer
frontFootOffset: 0.5,
backFootOffset: 0.1,
frontFootLift: 0.08, // Peak lift
cogHeight: 0, // Rise to normal height
},
{
frame: 11,
weight: 0.5, // Halfway through transfer
frontFootOffset: 0.8,
backFootOffset: 0.3,
frontFootLift: 0.05, // Begin descent
cogHeight: 0,
},
// Phase 3: Landing (frames 12-15)
{
frame: 12,
weight: 0.7, // Weight shifting forward
frontFootOffset: 1.0, // Front foot at target
backFootOffset: 0.5,
frontFootLift: 0.02, // Almost landed
cogHeight: -0.005, // Slight compression on landing
},
{
frame: 14,
weight: 0.8, // Mostly on front foot
frontFootOffset: 1.0,
backFootOffset: 0.8,
frontFootLift: 0,
cogHeight: -0.01, // Maximum compression
},
// Phase 4: Stabilization (frames 16-17)
{
frame: 16,
weight: 0.9, // Nearly complete transfer
frontFootOffset: 1.0,
backFootOffset: 1.0, // Back foot catches up
frontFootLift: 0,
cogHeight: -0.005, // Slight rebound
},
{
frame: 17,
weight: 1.0, // Fully on front foot (new position)
frontFootOffset: 1.0,
backFootOffset: 1.0,
frontFootLift: 0,
cogHeight: 0, // Return to neutral
},
];
/**
* Generate step animation config for a specific direction
*
* Creates animation configuration with Korean terminology:
* - forward: 전진보법 (Jeonjin Bobeop)
* - back: 후퇴보법 (Hutoe Bobeop)
* - left: 좌측면보법 (Jwacheuk Myeon Bobeop)
* - right: 우측면보법 (Ucheuk Myeon Bobeop)
* - Diagonals: Combined terms
*
* @param direction - Step direction (8 possibilities)
* @returns Step animation configuration
* @korean 발걸음애니메이션설정생성
*/
export function createStepConfig(direction: StepDirection): StepConfig {
const stateMap: Record<StepDirection, string> = {
forward: "step_forward",
back: "step_back",
left: "step_left",
right: "step_right",
forward_left: "step_forward_left",
forward_right: "step_forward_right",
back_left: "step_back_left",
back_right: "step_back_right",
};
return {
state: stateMap[direction] as AnimationState,
direction,
frames: STEP_ANIMATION_PARAMS.FRAMES,
fps: STEP_ANIMATION_PARAMS.FPS,
loop: false,
interruptible: STEP_ANIMATION_PARAMS.INTERRUPTIBLE,
priority: STEP_ANIMATION_PARAMS.PRIORITY,
duration: STEP_ANIMATION_PARAMS.DURATION,
distance: STEP_ANIMATION_PARAMS.DISTANCE,
maintainsGuard: true, // Always maintain guard during steps
staminaCost: STEP_ANIMATION_PARAMS.STAMINA_COST,
};
}
/**
* Map of all step animation configurations
*
* Eight directional step configurations for:
* - Cardinal directions: forward, back, left, right
* - Diagonal directions: forward_left, forward_right, back_left, back_right
*
* @korean 발걸음애니메이션맵
*/
export const STEP_ANIMATION_CONFIGS: ReadonlyMap<StepDirection, StepConfig> =
new Map([
["forward", createStepConfig("forward")],
["back", createStepConfig("back")],
["left", createStepConfig("left")],
["right", createStepConfig("right")],
["forward_left", createStepConfig("forward_left")],
["forward_right", createStepConfig("forward_right")],
["back_left", createStepConfig("back_left")],
["back_right", createStepConfig("back_right")],
]);
/**
* Interpolate between two keyframes
*
* Linear interpolation for smooth animation between keyframe values.
* Used for weight transfer, foot position, and center of gravity.
*
* @param keyframe1 - Start keyframe
* @param keyframe2 - End keyframe
* @param t - Interpolation factor (0-1)
* @returns Interpolated keyframe values
* @korean 키프레임보간
*/
export function interpolateStepKeyframes(
keyframe1: StepKeyframe,
keyframe2: StepKeyframe,
t: number,
): StepKeyframe {
return {
frame: Math.round(
keyframe1.frame + (keyframe2.frame - keyframe1.frame) * t,
),
weight: keyframe1.weight + (keyframe2.weight - keyframe1.weight) * t,
frontFootOffset:
keyframe1.frontFootOffset +
(keyframe2.frontFootOffset - keyframe1.frontFootOffset) * t,
backFootOffset:
keyframe1.backFootOffset +
(keyframe2.backFootOffset - keyframe1.backFootOffset) * t,
frontFootLift:
keyframe1.frontFootLift +
(keyframe2.frontFootLift - keyframe1.frontFootLift) * t,
cogHeight:
keyframe1.cogHeight + (keyframe2.cogHeight - keyframe1.cogHeight) * t,
};
}
/**
* Get step keyframe at specific frame
*
* Returns exact keyframe if frame matches, otherwise interpolates
* between surrounding keyframes for smooth animation.
*
* @param frame - Current frame number (0-17)
* @returns Keyframe data for current frame
* @korean 프레임별키프레임가져오기
*/
export function getStepKeyframeAtFrame(frame: number): StepKeyframe {
// Clamp frame to valid range
const clampedFrame = Math.max(
0,
Math.min(STEP_ANIMATION_PARAMS.FRAMES - 1, frame),
);
// Find exact match
const exactMatch = STEP_KEYFRAMES.find((kf) => kf.frame === clampedFrame);
if (exactMatch) {
return exactMatch;
}
// Find surrounding keyframes for interpolation
let beforeKeyframe = STEP_KEYFRAMES[0];
let afterKeyframe = STEP_KEYFRAMES[STEP_KEYFRAMES.length - 1];
for (let i = 0; i < STEP_KEYFRAMES.length - 1; i++) {
if (
STEP_KEYFRAMES[i].frame <= clampedFrame &&
STEP_KEYFRAMES[i + 1].frame >= clampedFrame
) {
beforeKeyframe = STEP_KEYFRAMES[i];
afterKeyframe = STEP_KEYFRAMES[i + 1];
break;
}
}
// Interpolate between keyframes
const frameDiff = afterKeyframe.frame - beforeKeyframe.frame;
const t =
frameDiff > 0 ? (clampedFrame - beforeKeyframe.frame) / frameDiff : 0;
return interpolateStepKeyframes(beforeKeyframe, afterKeyframe, t);
}
/**
* Calculate 3D position offset for step direction
*
* Converts step direction to normalized 3D vector for character movement.
* Diagonal steps have shorter individual x/y components to maintain
* consistent 30cm total distance.
*
* @param direction - Step direction
* @returns 3D position offset [x, y, z] in meters
* @korean 발걸음방향벡터계산
*/
export function getStepDirectionVector(
direction: StepDirection,
): [number, number, number] {
const distance = STEP_ANIMATION_PARAMS.DISTANCE;
const diagonalFactor = Math.sqrt(2) / 2; // ~0.707 for 45-degree diagonals
const vectors: Record<StepDirection, [number, number, number]> = {
forward: [0, 0, -distance], // Negative Z is forward in Three.js
back: [0, 0, distance],
left: [-distance, 0, 0],
right: [distance, 0, 0],
forward_left: [-distance * diagonalFactor, 0, -distance * diagonalFactor],
forward_right: [distance * diagonalFactor, 0, -distance * diagonalFactor],
back_left: [-distance * diagonalFactor, 0, distance * diagonalFactor],
back_right: [distance * diagonalFactor, 0, distance * diagonalFactor],
};
return vectors[direction];
}
/**
* Korean terminology for step directions
*
* Maps step directions to Korean martial arts terminology:
* - 전진보법 (Jeonjin Bobeop): Forward stepping method
* - 후퇴보법 (Hutoe Bobeop): Retreat stepping method
* - 측면보법 (Cheungmyeon Bobeop): Side stepping method
*
* @korean 발걸음한글용어
*/
export const STEP_KOREAN_TERMS: Record<
StepDirection,
{ korean: string; romanized: string; english: string }
> = {
forward: {
korean: "전진보법",
romanized: "Jeonjin Bobeop",
english: "Forward Step",
},
back: {
korean: "후퇴보법",
romanized: "Hutoe Bobeop",
english: "Retreat Step",
},
left: {
korean: "좌측면보법",
romanized: "Jwacheuk Myeon Bobeop",
english: "Left Side Step",
},
right: {
korean: "우측면보법",
romanized: "Ucheuk Myeon Bobeop",
english: "Right Side Step",
},
forward_left: {
korean: "전좌측보법",
romanized: "Jeon Jwacheuk Bobeop",
english: "Forward-Left Diagonal Step",
},
forward_right: {
korean: "전우측보법",
romanized: "Jeon Ucheuk Bobeop",
english: "Forward-Right Diagonal Step",
},
back_left: {
korean: "후좌측보법",
romanized: "Hu Jwacheuk Bobeop",
english: "Back-Left Diagonal Step",
},
back_right: {
korean: "후우측보법",
romanized: "Hu Ucheuk Bobeop",
english: "Back-Right Diagonal Step",
},
};
// ═══════════════════════════════════════════════════════════════════════════
// ADVANCED STEP TECHNIQUES (고급 발걸음 기술) - PHASE 4 ADDITION
// ═══════════════════════════════════════════════════════════════════════════
/**
* **NEW PHASE 4**: Advanced step technique types
*
* Three specialized stepping techniques from Korean martial arts:
*
* 1. **밀기 스텝 (Push Step - Milgi Step)**:
* - Rear foot explosively pushes off ground
* - Front foot receives and advances
* - Generates forward power for closing distance
* - Used before strikes or to pressure opponent
*
* 2. **당기기 스텝 (Pull Step - Danggigi Step)**:
* - Front foot pulls backward quickly
* - Rear foot follows to maintain stance
* - Creates defensive distance rapidly
* - Preserves guard and balance during retreat
*
* 3. **자르기 스텝 (Cut Step - Jareugi Step)**:
* - Diagonal step at 45° angle
* - Off-line from opponent's centerline
* - Creates tactical angle advantage
* - Evade while positioning for counter
*
* @korean 고급발걸음기술유형
*/
export type AdvancedStepType = "push" | "pull" | "cut_left";
/**
* **밀기 스텝 (Push Step)** - Power Generation through Rear Foot Drive
*
* **Korean Martial Arts Principle**: 뒷발 추진력 (Rear foot propulsion)
*
* Explosive forward movement where rear foot provides all the power:
* 1. Rear foot digs into ground (발뒤꿈치 압박)
* 2. Explosive extension of rear leg drives body forward
* 3. Front foot receives and extends farther forward
* 4. Used to close distance quickly before attacking
*
* **Biomechanics**:
* - Rear knee: Flexes to -25° then explosively extends to -5°
* - Front knee: Stays relatively straight to receive forward momentum
* - Pelvis: Drives forward with 20cm total displacement
* - Guard: Maintained throughout to protect during advance
*
* **Tactical Application**:
* - Close distance for punches or kicks
* - Pressure opponent toward cage/ropes
* - Entry for takedowns
* - Create forward momentum
*
* **Duration**: 280ms (explosive movement)
* **Distance**: 35cm (longer than normal step due to push power)
*
* @korean 밀기스텝_뒷발추진
*/
export const PUSH_STEP_KEYFRAMES: readonly StepKeyframe[] = [
// Initial stance
{
frame: 0,
weight: 0.5,
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: 0,
},
// Deep rear knee bend - loading power (준비)
{
frame: 2,
weight: 0.3,
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: -0.02, // Deep crouch
},
// Explosive rear leg extension begins (폭발적 추진)
{
frame: 5,
weight: 0.4,
frontFootOffset: 0.2,
backFootOffset: 0.1,
frontFootLift: 0.03,
cogHeight: -0.01, // Rising from crouch
},
// Maximum forward drive (최대 추진력)
{
frame: 8,
weight: 0.6,
frontFootOffset: 0.7,
backFootOffset: 0.4,
frontFootLift: 0.05,
cogHeight: 0.01, // Rising above neutral
},
// Front foot landing (착지)
{
frame: 11,
weight: 0.8,
frontFootOffset: 1.0,
backFootOffset: 0.7,
frontFootLift: 0.01,
cogHeight: -0.01, // Impact absorption
},
// Stabilization (안정)
{
frame: 14,
weight: 0.9,
frontFootOffset: 1.0,
backFootOffset: 1.0,
frontFootLift: 0,
cogHeight: 0,
},
];
/**
* **당기기 스텝 (Pull Step)** - Quick Defensive Retreat
*
* **Korean Martial Arts Principle**: 앞발 당김 (Front foot pull-back)
*
* Quick retreat where front foot initiates backward movement:
* 1. Front foot pulls back quickly (ball of foot contact)
* 2. Weight transfers to rear foot
* 3. Front foot lands and rear foot follows
* 4. Creates defensive distance while maintaining guard
*
* **Biomechanics**:
* - Front knee: Lifts to -20° then extends back
* - Rear knee: Accepts weight with flex to -15°
* - Pelvis: Moves backward 25cm smoothly
* - Eyes: Stay on opponent throughout
*
* **Tactical Application**:
* - Escape opponent's attack range
* - Reset distance after exchange
* - Defensive retreat under pressure
* - Maintain guard while withdrawing
*
* **Duration**: 300ms (controlled retreat)
* **Distance**: 30cm (standard defensive distance)
*
* @korean 당기기스텝_앞발당김
*/
export const PULL_STEP_KEYFRAMES: readonly StepKeyframe[] = [
// Initial stance
{
frame: 0,
weight: 0.5,
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: 0,
},
// Weight shift to rear (준비)
{
frame: 3,
weight: 0.3,
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: -0.01,
},
// Front foot lifts and pulls back (후퇴 시작)
{
frame: 6,
weight: 0.2,
frontFootOffset: -0.3,
backFootOffset: 0,
frontFootLift: 0.04,
cogHeight: -0.015,
},
// Front foot landing backward (착지)
{
frame: 10,
weight: 0.5,
frontFootOffset: -1.0,
backFootOffset: -0.3,
frontFootLift: 0.01,
cogHeight: -0.02,
},
// Rear foot follows (후속 이동)
{
frame: 13,
weight: 0.7,
frontFootOffset: -1.0,
backFootOffset: -0.8,
frontFootLift: 0,
cogHeight: -0.01,
},
// Final stable retreat position (안정)
{
frame: 17,
weight: 0.5,
frontFootOffset: -1.0,
backFootOffset: -1.0,
frontFootLift: 0,
cogHeight: 0,
},
];
/**
* **자르기 스텝 (Cut Step)** - Diagonal Angle Creation
*
* **Korean Martial Arts Principle**: 각도 전환 (Angle transition)
*
* Diagonal step at 45° to create off-line positioning:
* 1. Front foot steps forward-lateral at 45°
* 2. Body pivots to maintain guard facing opponent
* 3. Rear foot adjusts to restore stance
* 4. Results in superior angle advantage
*
* **Biomechanics**:
* - Front knee: Lifts and extends diagonally
* - Pelvis: Rotates 15-20° while moving diagonal
* - Spine: Counter-rotates to keep guard forward
* - Total displacement: 30cm at 45° angle
*
* **Tactical Application**:
* - Off-line from opponent's attack vector
* - Create angle for counter-strikes
* - Evade linear attacks
* - Position for opponent's blind side
*
* **Duration**: 320ms (requires precision)
* **Distance**: 30cm at 45° diagonal
* **Angle**: Off-line by 45° from original centerline
*
* @korean 자르기스텝_각도전환
*/
export const CUT_STEP_LEFT_KEYFRAMES: readonly StepKeyframe[] = [
// Initial stance
{
frame: 0,
weight: 0.5,
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: 0,
},
// Weight shift preparation (준비)
{
frame: 3,
weight: 0.3,
frontFootOffset: 0,
backFootOffset: 0,
frontFootLift: 0,
cogHeight: -0.015,
},
// Diagonal step begins - forward-left (각도 이동)
{
frame: 7,
weight: 0.4,
frontFootOffset: 0.5, // Diagonal: 50% forward, 50% lateral
backFootOffset: 0,
frontFootLift: 0.05,
cogHeight: -0.01,
},
// Foot plants at angle (각도 착지)
{
frame: 11,
weight: 0.7,
frontFootOffset: 1.0,
backFootOffset: 0.4,
frontFootLift: 0.01,
cogHeight: -0.02,
},
// Rear foot adjusts (후속 조정)
{
frame: 14,
weight: 0.8,
frontFootOffset: 1.0,
backFootOffset: 0.9,
frontFootLift: 0,
cogHeight: -0.01,
},
// Stable angled position (안정된 각도)
{
frame: 17,
weight: 0.6,
frontFootOffset: 1.0,
backFootOffset: 1.0,
frontFootLift: 0,
cogHeight: 0,
},
];
/**
* Korean terminology for advanced step techniques
*
* @korean 고급발걸음한글용어
*/
export const ADVANCED_STEP_KOREAN_TERMS: Record<
AdvancedStepType,
{ korean: string; romanized: string; english: string }
> = {
push: {
korean: "밀기 스텝",
romanized: "Milgi Step",
english: "Push Step (Power Drive)",
},
pull: {
korean: "당기기 스텝",
romanized: "Danggigi Step",
english: "Pull Step (Quick Retreat)",
},
cut_left: {
korean: "왼쪽 자르기 스텝",
romanized: "Oenjjok Jareugi Step",
english: "Cut Step Left (Diagonal Angle)",
},
};
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