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* useBalanceAnimations - Shared hook for balance state visual effects
*
* Manages sway, stumble, and lean animations based on player balance state.
* Reduces code duplication in skeletal animation components.
*
* @module hooks/useBalanceAnimations
* @category Hooks
* @korean 균형애니메이션훅
*/
import { useRef, useState } from "react";
import type { BalanceState } from "../types/player-visual";
/**
* Animation constants for balance state sway effects.
* Defines intensity, speed, and lean parameters for visual feedback.
* @korean 균형상태애니메이션상수
*/
const BALANCE_STATE_ANIMATION_CONSTANTS = {
SHAKEN: {
swayIntensity: 0.02, // 2% subtle sway
swaySpeed: 2, // Hz frequency
},
VULNERABLE: {
swayIntensity: 0.04, // 4% moderate sway
swaySpeed: 3, // Hz frequency
},
HELPLESS: {
stumbleIntensity: 0.08, // 8% pronounced stumble
stumbleSpeed: 1.5, // Hz frequency (slower, more dramatic)
leanIntensity: 0.15, // 15° forward lean angle
lowerStance: -0.15, // Lower Y position for stumbling effect
},
SWAY_THRESHOLD: 0.001, // Minimum sway to consider significant
} as const;
/**
* Checks if there is significant sway that requires animation updates.
*
* @param swayPosition - Current sway position [x, y, z]
* @param helplessRotation - Current helpless rotation angle
* @returns True if sway is above threshold
* @korean 의미있는흔들림확인
*/
const hasSignificantSway = (
swayPosition: [number, number, number],
helplessRotation: number
): boolean => {
return (
Math.abs(swayPosition[0]) >
BALANCE_STATE_ANIMATION_CONSTANTS.SWAY_THRESHOLD ||
Math.abs(swayPosition[1]) >
BALANCE_STATE_ANIMATION_CONSTANTS.SWAY_THRESHOLD ||
Math.abs(helplessRotation) >
BALANCE_STATE_ANIMATION_CONSTANTS.SWAY_THRESHOLD
);
};
/**
* Options for useBalanceAnimations hook
* @korean 균형애니메이션훅옵션
*/
export interface UseBalanceAnimationsOptions {
/** Current balance state */
readonly balance?: BalanceState;
}
/**
* Return type for useBalanceAnimations hook
* @korean 균형애니메이션훅반환타입
*/
export interface UseBalanceAnimationsReturn {
/** Current sway position offset [x, y, z] */
readonly swayPosition: [number, number, number];
/** Current helpless rotation (forward lean) */
readonly helplessRotation: number;
/** Update balance animations (call in useFrame) */
readonly updateBalanceAnimations: (delta: number, frameCounter: number) => void;
}
/**
* useBalanceAnimations hook
*
* Manages balance state visual effects including sway, stumble, and lean
* animations. Updates at 60fps with periodic state syncs to reduce re-renders.
*
* @param options - Balance animation options
* @returns Balance animation state and update function
*
* @example
* ```tsx
* const { swayPosition, helplessRotation, updateBalanceAnimations } =
* useBalanceAnimations({
* balance: "VULNERABLE",
* });
*
* // In useFrame callback
* let frameCounter = 0;
* useFrame((_, delta) => {
* frameCounter = (frameCounter + 1) % 10;
* updateBalanceAnimations(delta, frameCounter);
* });
*
* // Apply to character group in render:
* // position={swayPosition} rotation={[helplessRotation, 0, 0]}
* ```
*
* @korean 균형애니메이션훅
*/
export function useBalanceAnimations(
options: UseBalanceAnimationsOptions
): UseBalanceAnimationsReturn {
const { balance = "READY" } = options;
// Sway time ref for animation
const swayTimeRef = useRef(0);
// Sway position and rotation states
const [swayPosition, setSwayPosition] = useState<[number, number, number]>([
0, 0, 0,
]);
const [helplessRotation, setHelplessRotation] = useState<number>(0);
// Update balance animations (called at 60fps in useFrame)
const updateBalanceAnimations = (
delta: number,
frameCounter: number
): void => {
if (balance === "HELPLESS") {
// Helpless state: pronounced stumbling motion
swayTimeRef.current += delta;
const { stumbleIntensity, stumbleSpeed, leanIntensity, lowerStance } =
BALANCE_STATE_ANIMATION_CONSTANTS.HELPLESS;
const swayX =
Math.sin(swayTimeRef.current * stumbleSpeed) * stumbleIntensity;
const swayY =
Math.cos(swayTimeRef.current * stumbleSpeed * 0.5) *
stumbleIntensity *
0.3 +
lowerStance;
const leanAngle =
Math.sin(swayTimeRef.current * stumbleSpeed * 0.7) * leanIntensity;
// Update periodically to reduce React re-renders
if (frameCounter % 2 === 0) {
setSwayPosition([swayX, swayY, 0]);
setHelplessRotation(leanAngle);
}
} else if (balance === "SHAKEN" || balance === "VULNERABLE") {
// Shaken/Vulnerable state: subtle sway
swayTimeRef.current += delta;
const animConfig =
balance === "SHAKEN"
? BALANCE_STATE_ANIMATION_CONSTANTS.SHAKEN
: BALANCE_STATE_ANIMATION_CONSTANTS.VULNERABLE;
const swayX =
Math.sin(swayTimeRef.current * animConfig.swaySpeed) *
animConfig.swayIntensity;
const swayY =
Math.cos(swayTimeRef.current * animConfig.swaySpeed * 0.8) *
animConfig.swayIntensity *
0.5;
// Update sway position periodically
if (frameCounter % 2 === 0) {
setSwayPosition([swayX, swayY, 0]);
setHelplessRotation(0);
}
} else {
// Smoothly return to neutral position
if (
frameCounter % 2 === 0 &&
hasSignificantSway(swayPosition, helplessRotation)
) {
setSwayPosition([swayPosition[0] * 0.95, swayPosition[1] * 0.95, 0]);
setHelplessRotation(helplessRotation * 0.95);
}
// Reset sway time when not swaying
Iif (!hasSignificantSway(swayPosition, helplessRotation)) {
swayTimeRef.current = 0;
}
}
};
return {
swayPosition,
helplessRotation,
updateBalanceAnimations,
};
}
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