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* Step Animation System for Black Trigram
*
* Implements tactical step movement animations with precise 30cm steps
* based on Korean martial arts footwork (보법, Bobeop).
*
* Each step animation:
* - 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
*
* @module systems/animation/StepAnimations
* @category Animation
* @korean 발걸음애니메이션시스템
*/
import type { AnimationState, StepConfig, StepDirection, StepKeyframe } from './types';
import { STEP_PRIORITY } from './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 */
STAMINA_COST: 5,
/** 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',
},
};
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