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Nerf Bot AI Difficulty #26

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Nerf Bot AI Difficulty #26

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22 changes: 18 additions & 4 deletions server/npc.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,10 +11,11 @@ const MAX_NPC_COUNT = 4; // max bots per match
const MIN_REAL_PLAYERS_FOR_NO_BOTS = 4; // no bots when this many real players

// AI behavior constants
const NPC_SHOOT_RANGE = 250; // distance within which NPC will try to shoot
const NPC_SHOOT_ANGLE_TOLERANCE = 0.3; // radians (~17 degrees)
const NPC_SHOOT_RANGE = 190; // distance within which NPC will try to shoot (nerfed from 250)
const NPC_SHOOT_ANGLE_TOLERANCE = 0.55; // radians (~31 degrees) — wider tolerance means less accurate (nerfed from 0.3)
const NPC_RING_DANGER_MARGIN = 50; // start moving inward when this close to ring edge
const NPC_WANDER_CHANGE_INTERVAL = 2000; // ms between wander direction changes
const NPC_REACTION_DELAY = 400; // ms before NPC starts shooting at a newly spotted enemy

/**
* Create an NPC player object (no WebSocket).
Expand All @@ -35,6 +36,8 @@ function createNPC(id, name) {
hasMachineGun: false,
_wanderAngle: Math.random() * Math.PI * 2,
_wanderChangeTime: 0,
_currentTargetId: null,
_targetAcquiredTime: 0,
};
}

Expand Down Expand Up @@ -113,16 +116,26 @@ function updateNPCAI(npc, game, dt, now) {
targetY = npc.y + Math.sin(perpAngle) * 50;
}

// Shoot if within range and roughly facing the enemy
// Track target acquisition for reaction delay
if (npc._currentTargetId !== nearestEnemy.id) {
npc._currentTargetId = nearestEnemy.id;
npc._targetAcquiredTime = now;
}

// Shoot if within range, roughly facing the enemy, and reaction delay has elapsed
if (nearestDist < NPC_SHOOT_RANGE) {
const angleToEnemy = Math.atan2(dy, dx);
let angleDiff = Math.abs(npc.angle - angleToEnemy);
if (angleDiff > Math.PI) angleDiff = 2 * Math.PI - angleDiff;
if (angleDiff < NPC_SHOOT_ANGLE_TOLERANCE) {
if (angleDiff < NPC_SHOOT_ANGLE_TOLERANCE && (now - npc._targetAcquiredTime) >= NPC_REACTION_DELAY) {
shouldShoot = true;
}
}
} else {
// No enemy in sight — clear target tracking
npc._currentTargetId = null;
npc._targetAcquiredTime = 0;

// 3. No enemy found — wander toward centroid with some randomness
if (now - npc._wanderChangeTime > NPC_WANDER_CHANGE_INTERVAL) {
npc._wanderAngle = Math.atan2(
Expand Down Expand Up @@ -168,6 +181,7 @@ module.exports = {
MIN_REAL_PLAYERS_FOR_NO_BOTS,
NPC_SHOOT_RANGE,
NPC_SHOOT_ANGLE_TOLERANCE,
NPC_REACTION_DELAY,
createNPC,
pickNPCName,
updateNPCAI,
Expand Down
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