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* GrapplingIndicator3D - Visual indicator for grappling state and struggle
*
* **Korean**: 잡기 표시기 3D (Japgi Pyosigi 3D)
*
* Displays visual feedback during grappling interactions including:
* - Struggle particle effects
* - Grip strength meter (UI overlay)
* - Bilingual state text (Korean-English)
* - Shake effects during escape attempts
*
* Features:
* - Particle system for struggle visualization
* - HTML overlay for grip strength UI
* - Smooth transitions between grapple states
* - Performance optimized for 60fps
* - Korean-English bilingual text support
*
* @module components/shared/three/effects/GrapplingIndicator3D
* @category Combat Effects
* @korean 잡기표시기3D
*/
import { Html } from "@react-three/drei";
import { useFrame } from "@react-three/fiber";
import React, { useRef, useEffect, useState } from "react";
import * as THREE from "three";
import { KOREAN_COLORS } from "../../../../types/constants";
import type { Position3D } from "../../../../types/physics";
import { GrappleControl, GrappleState } from "../../../../types/common";
/**
* Props for GrapplingIndicator3D component
*/
export interface GrapplingIndicator3DProps {
/** Current grapple control state (undefined if not grappling) */
readonly grappleControl: GrappleControl | undefined;
/** Character position in 3D space (meters) */
readonly characterPosition: Position3D;
/** Whether the character is the controller (attacker) */
readonly isController: boolean;
/** Whether to use mobile-optimized rendering */
readonly isMobile?: boolean;
/** Test ID for component testing */
readonly "data-testid"?: string;
}
/**
* Particle count based on grapple state
*/
const PARTICLE_COUNT_MAP: Record<string, number> = {
[GrappleState.NONE]: 0,
[GrappleState.GRABBING]: 20,
[GrappleState.CONTROLLING]: 30,
[GrappleState.ESCAPING]: 50,
[GrappleState.THROWING]: 40,
[GrappleState.LOCKING]: 35,
};
/**
* Get bilingual text for grapple state
*
* @param state - Current grapple state
* @param isController - Whether viewing as controller
* @returns Korean and English text for the state
*/
function getGrappleStateText(
state: GrappleState,
isController: boolean
): { korean: string; english: string } {
if (isController) {
switch (state) {
case GrappleState.NONE:
return { korean: "없음", english: "None" };
case GrappleState.GRABBING:
return { korean: "잡기 중", english: "Grabbing" };
case GrappleState.CONTROLLING:
return { korean: "잡기 유지", english: "Controlling" };
case GrappleState.ESCAPING:
return { korean: "제어 상실", english: "Losing Control" };
case GrappleState.THROWING:
return { korean: "던지기", english: "Throwing" };
case GrappleState.LOCKING:
return { korean: "관절기", english: "Joint Lock" };
}
} else {
switch (state) {
case GrappleState.NONE:
return { korean: "없음", english: "None" };
case GrappleState.GRABBING:
return { korean: "잡힘", english: "Grabbed" };
case GrappleState.CONTROLLING:
return { korean: "잡힘 상태", english: "Grappled" };
case GrappleState.ESCAPING:
return { korean: "탈출 중", english: "Escaping" };
case GrappleState.THROWING:
return { korean: "던져짐", english: "Being Thrown" };
case GrappleState.LOCKING:
return { korean: "관절기당함", english: "Locked" };
}
}
}
/**
* Get color for grapple state visualization
*
* @param state - Current grapple state
* @param isController - Whether viewing as controller
* @returns Hex color value
*/
function getGrappleStateColor(
state: GrappleState,
isController: boolean
): number {
if (isController) {
switch (state) {
case GrappleState.NONE:
return KOREAN_COLORS.UI_GRAY;
case GrappleState.GRABBING:
return KOREAN_COLORS.ACCENT_CYAN;
case GrappleState.CONTROLLING:
return KOREAN_COLORS.ACCENT_GOLD;
case GrappleState.ESCAPING:
return KOREAN_COLORS.WARNING_ORANGE;
case GrappleState.THROWING:
return KOREAN_COLORS.ACCENT_PURPLE;
case GrappleState.LOCKING:
return KOREAN_COLORS.CRITICAL_HIT;
}
} else {
switch (state) {
case GrappleState.NONE:
return KOREAN_COLORS.UI_GRAY;
case GrappleState.GRABBING:
return KOREAN_COLORS.WARNING_ORANGE;
case GrappleState.CONTROLLING:
return KOREAN_COLORS.NEGATIVE_RED;
case GrappleState.ESCAPING:
return KOREAN_COLORS.ACCENT_GREEN;
case GrappleState.THROWING:
return KOREAN_COLORS.WARNING_YELLOW;
case GrappleState.LOCKING:
return KOREAN_COLORS.NEGATIVE_RED;
}
}
}
/**
* Struggle particle system component
*
* Displays particles during grappling to visualize struggle and resistance.
* Particle count and movement intensity scale with grapple state.
*/
const StruggleParticles: React.FC<{
readonly particleCount: number;
readonly color: number;
readonly intensity: number;
readonly position: Position3D;
}> = ({ particleCount, color, intensity, position }) => {
const pointsRef = useRef<THREE.Points>(null);
// Positions for initial geometry (useState to allow access during render)
const [positions, setPositions] = useState<Float32Array>(
() => new Float32Array(particleCount * 3)
);
// Velocities are mutable and only accessed in useFrame (useRef is fine)
const velocitiesRef = useRef<Float32Array>(new Float32Array(particleCount * 3));
// Initialize particle positions and velocities when count or intensity changes
useEffect(() => {
const pos = new Float32Array(particleCount * 3);
const vel = new Float32Array(particleCount * 3);
for (let i = 0; i < particleCount; i++) {
const i3 = i * 3;
const radius = 0.3 + Math.random() * 0.4; // 0.3-0.7m from center
const theta = Math.random() * Math.PI * 2;
const phi = Math.random() * Math.PI;
// Spherical distribution around character
pos[i3] = radius * Math.sin(phi) * Math.cos(theta);
pos[i3 + 1] = 1.2 + radius * Math.cos(phi); // Center at chest height
pos[i3 + 2] = radius * Math.sin(phi) * Math.sin(theta);
// Outward velocities with some randomness
vel[i3] = (Math.random() - 0.5) * intensity * 2;
vel[i3 + 1] = Math.random() * intensity;
vel[i3 + 2] = (Math.random() - 0.5) * intensity * 2;
}
setPositions(pos);
velocitiesRef.current = vel;
// Update geometry if it exists
if (pointsRef.current) {
const attr = pointsRef.current.geometry.attributes.position;
(attr.array as Float32Array).set(pos);
attr.needsUpdate = true;
}
}, [particleCount, intensity]);
// Cleanup geometry and material on unmount
useEffect(() => {
const points = pointsRef.current;
return () => {
if (points) {
// Dispose geometry
points.geometry.dispose();
// Dispose material
if (points.material instanceof THREE.Material) {
points.material.dispose();
}
}
};
}, []);
// Animate particles
useFrame((_state, delta) => {
if (!pointsRef.current) return;
const attr = pointsRef.current.geometry.attributes.position;
const array = attr.array as Float32Array;
const velocities = velocitiesRef.current;
for (let i = 0; i < particleCount; i++) {
const i3 = i * 3;
// Update positions with velocities
array[i3] += velocities[i3] * delta;
array[i3 + 1] += velocities[i3 + 1] * delta;
array[i3 + 2] += velocities[i3 + 2] * delta;
// Decay upward velocity (gravity simulation)
velocities[i3 + 1] -= 2.0 * delta;
// Reset particles that fall too low or go too far
const y = array[i3 + 1];
const distFromCenter = Math.sqrt(
array[i3] * array[i3] + array[i3 + 2] * array[i3 + 2]
);
if (y < 0.5 || distFromCenter > 1.5) {
const radius = 0.3 + Math.random() * 0.2;
const theta = Math.random() * Math.PI * 2;
const phi = Math.random() * Math.PI;
array[i3] = radius * Math.sin(phi) * Math.cos(theta);
array[i3 + 1] = 1.2 + radius * Math.cos(phi);
array[i3 + 2] = radius * Math.sin(phi) * Math.sin(theta);
velocities[i3] = (Math.random() - 0.5) * intensity * 2;
velocities[i3 + 1] = Math.random() * intensity;
velocities[i3 + 2] = (Math.random() - 0.5) * intensity * 2;
}
}
attr.needsUpdate = true;
});
if (particleCount === 0) return null;
return (
<points ref={pointsRef} position={[position.x, position.y, position.z]}>
<bufferGeometry>
<bufferAttribute
attach="attributes-position"
args={[positions, 3]}
/>
</bufferGeometry>
<pointsMaterial
color={color}
size={0.04}
sizeAttenuation
transparent
opacity={0.7}
depthWrite={false}
blending={THREE.AdditiveBlending}
/>
</points>
);
};
/**
* Grip strength meter UI overlay
*
* Displays grip strength as a horizontal bar with bilingual labels.
*/
const GripStrengthMeter: React.FC<{
readonly gripStrength: number;
readonly maxGripStrength: number;
readonly stateText: { korean: string; english: string };
readonly color: number;
}> = ({ gripStrength, maxGripStrength, stateText, color }) => {
const percentage = (gripStrength / maxGripStrength) * 100;
const hexColor = `#${color.toString(16).padStart(6, "0")}`;
return (
<div
style={{
backgroundColor: "rgba(10, 10, 10, 0.85)",
border: `2px solid ${hexColor}`,
borderRadius: "8px",
padding: "8px 12px",
minWidth: "200px",
fontFamily: "'Noto Sans KR', 'Roboto', sans-serif",
boxShadow: `0 4px 12px rgba(0, 0, 0, 0.6), 0 0 20px ${hexColor}40`,
}}
data-testid="grip-strength-meter"
>
{/* State text */}
<div
style={{
display: "flex",
justifyContent: "space-between",
marginBottom: "6px",
fontSize: "14px",
fontWeight: 600,
}}
>
<span style={{ color: hexColor }}>{stateText.korean}</span>
<span style={{ color: hexColor }}>{stateText.english}</span>
</div>
{/* Grip strength bar */}
<div
style={{
width: "100%",
height: "20px",
backgroundColor: "rgba(90, 101, 120, 0.3)",
borderRadius: "4px",
overflow: "hidden",
border: "1px solid rgba(255, 255, 255, 0.2)",
}}
>
<div
style={{
width: `${percentage}%`,
height: "100%",
backgroundColor: hexColor,
transition: "width 0.3s ease-out",
boxShadow: `0 0 10px ${hexColor}`,
}}
data-testid="grip-bar-fill"
/>
</div>
{/* Grip strength value */}
<div
style={{
textAlign: "center",
marginTop: "4px",
fontSize: "12px",
color: "#cccccc",
fontWeight: 500,
}}
>
{Math.round(gripStrength)} / {maxGripStrength}
</div>
</div>
);
};
/**
* Main GrapplingIndicator3D component
*
* Renders struggle particles and grip strength UI during grappling.
* Automatically adjusts visualization based on grapple state.
*/
export const GrapplingIndicator3D: React.FC<GrapplingIndicator3DProps> = ({
grappleControl,
characterPosition,
isController,
isMobile = false,
"data-testid": testId = "grappling-indicator-3d",
}) => {
// Don't render if not grappling
if (!grappleControl) return null;
const { state, gripStrength } = grappleControl;
const maxGripStrength = 100; // TODO: Get from config
// Get visual properties for current state
const particleCount = isMobile
? Math.floor(PARTICLE_COUNT_MAP[state] * 0.6) // Reduce particles on mobile
: PARTICLE_COUNT_MAP[state];
const color = getGrappleStateColor(state, isController);
const stateText = getGrappleStateText(state, isController);
// Struggle intensity scales with grip strength and state
const intensity = state === GrappleState.ESCAPING ? 1.5 : 0.8;
return (
<group data-testid={testId}>
{/* Struggle particle effect */}
<StruggleParticles
particleCount={particleCount}
color={color}
intensity={intensity}
position={characterPosition}
/>
{/* Grip strength meter overlay */}
<Html
position={[characterPosition.x, characterPosition.y + 2.2, characterPosition.z]}
center
distanceFactor={8}
zIndexRange={[100, 0]}
>
<GripStrengthMeter
gripStrength={gripStrength}
maxGripStrength={maxGripStrength}
stateText={stateText}
color={color}
/>
</Html>
</group>
);
};
export default GrapplingIndicator3D;
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