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* System for managing Korean martial arts vital point (급소) targeting and damage calculation.
*
* **Korean**: 급소 시스템 (Vital Point System)
*
* The VitalPointSystem implements anatomical targeting mechanics based on traditional
* Korean martial arts knowledge of 70 vital points (급소). It handles hit detection,
* damage calculation, and status effect application for precise strikes.
*
* ## Vital Point Philosophy
*
* Korean martial arts identify specific anatomical locations that, when struck precisely,
* can cause disproportionate effects. The system categorizes points by:
*
* - **Location**: Head, neck, torso, limbs, and core
* - **Category**: Neurological, vascular, respiratory, muscular, skeletal, etc.
* - **Severity**: Minor, moderate, major, critical, lethal
* - **Effects**: Unconsciousness, paralysis, pain, stunning, etc.
*
* ## Key Features
*
* - Distance-based hit detection with accuracy falloff
* - Severity multipliers for damage calculation
* - Targeted vs. proximity-based strikes
* - Bilingual Korean-English vital point names
* - Realistic anatomical positioning
*
* @example
* ```typescript
* const vitalPointSystem = new VitalPointSystem();
*
* // Process a strike at specific position
* const result = vitalPointSystem.processHit(
* { x: 100, y: 50 }, // Target position
* { width: 10, height: 10 }, // Hit box
* "GB-20" // Optional: target specific vital point
* );
*
* if (result.hit && result.vitalPointHit) {
* console.log(`Hit ${result.vitalPointHit.names.english}!`);
* console.log(`Damage: ${result.damage}, Severity: ${result.severity}`);
* }
* ```
*
* @public
* @category Vital Point System
* @korean 급소시스템
*/
import { Position, VitalPointSeverity } from "../types/common";
import { VitalPoint, VitalPointHitResult } from "./vitalpoint/types";
import { VITAL_POINTS_DATA } from "./vitalpoint/VitalPointsData";
export class VitalPointSystem {
private vitalPoints: VitalPoint[] = [];
/**
* Creates a new VitalPointSystem instance.
*
* Initializes the system with comprehensive Korean vital points database.
*/
constructor() {
// Initialize with comprehensive Korean vital points database
this.initializeVitalPoints();
}
/**
* Processes a hit at a specific position to determine vital point impact.
*
* Evaluates whether a strike lands on or near a vital point, calculating
* damage and effects based on accuracy and severity. Supports both targeted
* strikes (specific vital point ID) and proximity-based detection.
*
* ## Hit Detection Algorithm
*
* 1. If targetedVitalPointId provided, validate that specific point
* 2. Otherwise, find closest vital point to target position
* 3. Calculate distance from strike to vital point
* 4. Apply accuracy falloff based on distance (max 50px)
* 5. Return hit result with damage multipliers
*
* @param targetPosition - Position where strike lands
* @param _hitBox - Size of hit box (currently unused, reserved for future)
* @param targetedVitalPointId - Optional specific vital point being targeted
* @returns Hit result with damage, effects, and severity
*
* @example
* ```typescript
* // Proximity-based strike
* const result1 = vitalPointSystem.processHit(
* { x: 100, y: 50 },
* { width: 10, height: 10 }
* );
*
* // Targeted strike at temple (태양혈)
* const result2 = vitalPointSystem.processHit(
* { x: 100, y: 50 },
* { width: 10, height: 10 },
* "head_temple"
* );
* ```
*
* @public
* @korean 타격처리
*/
processHit(
targetPosition: Position,
_hitBox: { width: number; height: number }, // Prefixed with underscore to indicate intentionally unused
targetedVitalPointId?: string | null
): VitalPointHitResult {
// If a specific vital point is targeted, check that one
if (targetedVitalPointId) {
const targetVitalPoint = this.getVitalPointById(targetedVitalPointId);
if (targetVitalPoint) {
return this.calculateVitalPointHit(targetVitalPoint, targetPosition);
}
}
// Otherwise, find the closest vital point
const closestVitalPoint = this.findClosestVitalPoint(targetPosition);
Iif (!closestVitalPoint) {
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
// Calculate distance to determine hit accuracy
const distance = this.calculateDistance(
targetPosition,
closestVitalPoint.position
);
const maxHitDistance = 50; // pixels
if (distance <= maxHitDistance) {
return {
hit: true,
vitalPointHit: closestVitalPoint,
damage: this.calculateBaseDamage(closestVitalPoint, distance),
effects: [],
severity: closestVitalPoint.severity,
accuracy: Math.max(0, 1 - distance / maxHitDistance),
};
}
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
/**
* Retrieves a vital point by its unique identifier.
*
* @param id - Vital point identifier (e.g., "GB-20", "head_temple")
* @returns Vital point if found, null otherwise
*
* @example
* ```typescript
* const temple = vitalPointSystem.getVitalPointById("head_temple");
* if (temple) {
* console.log(temple.names.korean); // "태양혈"
* }
* ```
*
* @public
* @korean 급소조회
*/
getVitalPointById(id: string): VitalPoint | null {
return this.vitalPoints.find((vp) => vp.id === id) || null;
}
/**
* Gets all registered vital points in the system.
*
* @returns Read-only array of all vital points
*
* @example
* ```typescript
* const allPoints = vitalPointSystem.getVitalPoints();
* console.log(`${allPoints.length} vital points registered`);
* ```
*
* @public
* @korean 급소목록조회
*/
getVitalPoints(): readonly VitalPoint[] {
return this.vitalPoints;
}
/**
* Calculates hit result for a technique-based attack.
*
* Determines whether a technique successfully lands on a vital point,
* factoring in technique accuracy, attacker position, and randomness.
* Used for AI and player technique execution.
*
* @param technique - Technique being executed with accuracy property
* @param attackerPosition - Position where attack originates
* @param _defenderPosition - Defender position (reserved for future use)
* @param _defenderStance - Defender stance (reserved for future use)
* @returns Hit result with damage and effects
*
* @example
* ```typescript
* const technique = {
* id: "geon-thunder-strike",
* accuracy: 0.85
* };
*
* const result = vitalPointSystem.calculateHit(
* technique,
* { x: 100, y: 50 },
* { x: 120, y: 50 },
* TrigramStance.GEON
* );
* ```
*
* @public
* @korean 기술타격계산
*/
calculateHit(
technique: any,
attackerPosition: Position,
_defenderPosition: Position, // Prefixed with underscore to indicate intentionally unused
_defenderStance: any // Prefixed with underscore to indicate intentionally unused
): VitalPointHitResult {
// Find closest vital point to attack
const closestVitalPoint = this.findClosestVitalPoint(attackerPosition);
Iif (!closestVitalPoint) {
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
// Calculate hit based on technique accuracy and distance
const distance = this.calculateDistance(
attackerPosition,
closestVitalPoint.position
);
const hitChance = technique.accuracy * (1 - distance / 100);
if (Math.random() < hitChance) {
return {
hit: true,
vitalPointHit: closestVitalPoint,
damage: this.calculateBaseDamage(closestVitalPoint, distance),
effects: [],
severity: closestVitalPoint.severity,
};
}
return {
hit: false,
damage: 0,
effects: [],
severity: VitalPointSeverity.MINOR,
};
}
/**
* Finds the closest vital point to a given position.
*
* Uses Euclidean distance to determine proximity.
*
* @param position - Target position
* @returns Closest vital point or null if none registered
*
* @private
* @korean 최근접급소검색
*/
private findClosestVitalPoint(position: Position): VitalPoint | null {
Iif (this.vitalPoints.length === 0) return null;
let closest = this.vitalPoints[0];
let minDistance = this.calculateDistance(position, closest.position);
for (const vitalPoint of this.vitalPoints) {
const distance = this.calculateDistance(position, vitalPoint.position);
if (distance < minDistance) {
minDistance = distance;
closest = vitalPoint;
}
}
return closest;
}
/**
* Calculates Euclidean distance between two positions.
*
* @param pos1 - First position
* @param pos2 - Second position
* @returns Distance in pixels
*
* @private
* @korean 거리계산
*/
private calculateDistance(pos1: Position, pos2: Position): number {
const dx = pos1.x - pos2.x;
const dy = pos1.y - pos2.y;
return Math.sqrt(dx * dx + dy * dy);
}
/**
* Calculates vital point hit result with accuracy and damage.
*
* @param vitalPoint - Vital point being struck
* @param hitPosition - Exact position of strike
* @returns Hit result with calculated damage and accuracy
*
* @private
* @korean 급소타격결과계산
*/
private calculateVitalPointHit(
vitalPoint: VitalPoint,
hitPosition: Position
): VitalPointHitResult {
const distance = this.calculateDistance(hitPosition, vitalPoint.position);
const baseDamage = this.calculateBaseDamage(vitalPoint, distance);
return {
hit: true,
vitalPointHit: vitalPoint,
damage: baseDamage,
effects: [],
severity: vitalPoint.severity,
accuracy: Math.max(0, 1 - distance / 50),
};
}
/**
* Calculates base damage for a vital point strike.
*
* Applies distance-based falloff to vital point's base damage value.
* Closer strikes deal more damage up to maximum base damage.
*
* @param vitalPoint - Vital point with base damage property
* @param distance - Distance from strike to vital point center
* @returns Calculated damage value
*
* @private
* @korean 기본피해계산
*/
private calculateBaseDamage(
vitalPoint: VitalPoint,
distance: number
): number {
const baseDamage = vitalPoint.baseDamage || 10;
const distanceModifier = Math.max(0.1, 1 - distance / 100);
return Math.floor(baseDamage * distanceModifier);
}
/**
* Initializes the system with comprehensive Korean vital points.
*
* Loads all 70 Korean vital points from the comprehensive database
* covering head, torso, arms, and legs with proper categorization.
*
* @private
* @korean 급소초기화
*/
private initializeVitalPoints(): void {
// Load all 70 vital points from the comprehensive database
this.vitalPoints = [...VITAL_POINTS_DATA];
}
}
export default VitalPointSystem;
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