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import { getMap } from "../map.js";
import { Map, Vec2, GhostType, GameState, SpawnIndex, Player, Rotation, GhostState, Tile, Ghost } from "../types.js";
import { random } from "./logic.js";
import { MOVE_SPEED, roundPos, isStablePos, getTile, getTileFrontWithRot, incrementPos } from "./movement.js";
const diff = (a: Vec2, b:Vec2): Vec2 => {
return {x: a.x - b.x, y: a.y - b.y}
}
const dist = (a: Vec2, b: Vec2): number => {
return Math.sqrt(Math.pow(a.x - b.x, 2) + Math.pow(a.y - b.y, 2))
}
const trans = (pos: Vec2, rot: Rotation, dist: number): Vec2 => {
switch (rot) {
case Rotation.NORTH:
case Rotation.NOTHING:
return {x: pos.x - dist, y: pos.y - dist}
case Rotation.EAST:
return {x: pos.x + dist, y: pos.y}
case Rotation.SOUTH:
return {x: pos.x, y: pos.y + dist}
case Rotation.WEST:
return {x: pos.x - dist, y: pos.y}
}
}
const getNearestPlayer = (state: GameState, pos: Vec2): Player => {
let min = undefined;
let nearest = undefined;
for (let id in state.players) {
let player = state.players[id];
if (!id) continue;
let d = dist(player.pos, pos)
if (!min || min > d) {
min = d
nearest = player
}
}
return nearest
}
const pickTargetScatter = (state: GameState, type: GhostType): Vec2 => {
let map = getMap(state.mapId)
switch (type) {
case GhostType.BLINKY:
return {x: 0, y: -1}
case GhostType.PINKY:
return {x: map.width - 1, y: -1}
case GhostType.INKY:
return {x: map.width - 1, y: map.height}
case GhostType.CLYDE:
return {x: 0, y: map.height}
}
}
const pickTargetChase = (state: GameState, type: GhostType): Vec2 => {
let ghost = state.ghosts[type]
let player = getNearestPlayer(state, ghost.pos)
switch (type) {
case GhostType.BLINKY:
return {x: player.pos.x, y: player.pos.y}
case GhostType.PINKY:
return trans(player.pos, player.moveRotation, 2)
case GhostType.INKY:
let target = trans(player.pos, player.moveRotation, 1)
let vec = diff(target, state.ghosts[GhostType.BLINKY].pos)
return {x: target.x + vec.x, y: target.y + vec.y}
case GhostType.CLYDE:
if (dist(ghost.pos, player.pos) > 8)
return {x: player.pos.x, y: player.pos.y}
else
return pickTargetScatter(state, type)
}
}
const pickTarget = (state: GameState, map: Map, type: GhostType): Vec2 => {
let ghost: Ghost = state.ghosts[type]
switch (ghost.state) {
case GhostState.SCATTER:
return pickTargetScatter(state, type)
case GhostState.CHASE:
return pickTargetChase(state, type)
case GhostState.EATEN:
return structuredClone(map.spawns[SpawnIndex.GHOST_SPAWN])
case GhostState.SCARED:
return {
x: random(state) % map.width,
y: random(state) % map.height
}
}
}
const flipRot = (rot: Rotation) => {
switch (rot) {
case Rotation.NORTH:
return Rotation.SOUTH
case Rotation.SOUTH:
return Rotation.NORTH
case Rotation.EAST:
return Rotation.WEST
case Rotation.WEST:
return Rotation.EAST
}
}
const updateGhost = (state: GameState, map: Map, type: GhostType) => {
let ghost: Ghost = state.ghosts[type]
if (!ghost) {
ghost = {
pos: structuredClone(map.spawns[SpawnIndex.GHOST_SPAWN]),
target: structuredClone(map.spawns[SpawnIndex.GHOST_SPAWN]),
type,
state: GhostState.SCARED,
currentDirection: Rotation.EAST,
}
state.ghosts[type] = ghost
}
if (isStablePos(ghost.pos)) {
ghost.pos = roundPos(ghost.pos)
let front = getTileFrontWithRot(map, ghost.pos, ghost.currentDirection) == Tile.WALL
let north = getTile(map, ghost.pos, 0, -1) != Tile.WALL
let east = getTile(map, ghost.pos, 1, 0) != Tile.WALL
let south = getTile(map, ghost.pos, 0, 1) != Tile.WALL
let west = getTile(map, ghost.pos, -1, 0) != Tile.WALL
let isIntersection =
(north && east) ||
(east && south) ||
(south && west) ||
(west && north)
if (!isIntersection && front) {
ghost.currentDirection = flipRot(ghost.currentDirection)
} else if (isIntersection) {
let target = pickTarget(state, map, type)
ghost.target = target
let newRot = ghost.currentDirection
let min = undefined
if (north && ghost.currentDirection !== Rotation.SOUTH) {
let d = dist({x: ghost.pos.x, y: ghost.pos.y - 1}, target)
if (!min || min > d) {
min = d
newRot = Rotation.NORTH
}
}
if (east && ghost.currentDirection !== Rotation.WEST) {
let d = dist({x: ghost.pos.x + 1, y: ghost.pos.y}, target)
if (!min || min > d) {
min = d
newRot = Rotation.EAST
}
}
if (south && ghost.currentDirection !== Rotation.NORTH) {
let d = dist({x: ghost.pos.x, y: ghost.pos.y + 1}, target)
if (!min || min > d) {
min = d
newRot = Rotation.SOUTH
}
}
if (west && ghost.currentDirection !== Rotation.EAST) {
let d = dist({x: ghost.pos.x - 1, y: ghost.pos.y}, target)
if (!min || min > d) {
min = d
newRot = Rotation.WEST
}
}
ghost.currentDirection = newRot
}
}
incrementPos(ghost.pos, ghost.currentDirection, MOVE_SPEED)
}
export const updateGhosts = (state: GameState) => {
let map = getMap(state.mapId)
if (!map) return
updateGhost(state, map, GhostType.BLINKY)
updateGhost(state, map, GhostType.PINKY)
updateGhost(state, map, GhostType.INKY)
updateGhost(state, map, GhostType.CLYDE)
}
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