feat(enemies): 实现怪物基类与4种怪物及波次管理器

game/enemies/EnemyBase.ts

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+import type Phaser from 'phaser'
+import { GameManager } from '../GameManager'
+import { TILE_SIZE, HUD_HEIGHT, PATH_WAYPOINTS } from '../constants'
+
+export interface PathPoint {
+  x: number
+  y: number
+}
+
+/** 将格子坐标转换为像素坐标（格子中心） */
+function gridToPixel(gx: number, gy: number): PathPoint {
+  return {
+    x: gx * TILE_SIZE + TILE_SIZE / 2,
+    y: gy * TILE_SIZE + TILE_SIZE / 2 + HUD_HEIGHT,
+  }
+}
+
+/** 将 PATH_WAYPOINTS 扩展为完整转折路径（去重相邻相同点） */
+export function buildFullPath(): PathPoint[] {
+  const points: PathPoint[] = []
+  for (let i = 0; i < PATH_WAYPOINTS.length - 1; i++) {
+    const from = gridToPixel(PATH_WAYPOINTS[i].x, PATH_WAYPOINTS[i].y)
+    const to = gridToPixel(PATH_WAYPOINTS[i + 1].x, PATH_WAYPOINTS[i + 1].y)
+    points.push(from)
+    points.push(to)
+  }
+  return points.filter(
+    (p, i, arr) => i === 0 || p.x !== arr[i - 1].x || p.y !== arr[i - 1].y
+  )
+}
+
+export interface DotEffect {
+  damage: number
+  duration: number
+  timer: number
+}
+
+export abstract class EnemyBase {
+  protected scene: Phaser.Scene
+  public sprite!: Phaser.GameObjects.Graphics
+  protected healthBar!: Phaser.GameObjects.Graphics
+  protected quoteText!: Phaser.GameObjects.Text
+
+  public maxHp: number
+  public hp: number
+  public speed: number
+  public readonly kpiDamage: number
+  public readonly hcReward: number
+
+  protected pathPoints: PathPoint[]
+  protected currentPathIndex: number = 0
+  protected x: number = 0
+  protected y: number = 0
+
+  public isDead: boolean = false
+  public isActive: boolean = true
+
+  get pathProgress(): number {
+    return this.currentPathIndex
+  }
+  public dotEffects: DotEffect[] = []
+  public slowEffect: number = 0
+  public slowTimer: number = 0
+  public shieldCount: number = 0
+
+  constructor(
+    scene: Phaser.Scene,
+    pathPoints: PathPoint[],
+    maxHp: number,
+    speed: number,
+    kpiDamage: number,
+    hcReward: number
+  ) {
+    this.scene = scene
+    this.pathPoints = pathPoints
+    this.maxHp = maxHp
+    this.hp = maxHp
+    this.speed = speed
+    this.kpiDamage = kpiDamage
+    this.hcReward = hcReward
+
+    if (pathPoints.length > 0) {
+      this.x = pathPoints[0].x
+      this.y = pathPoints[0].y
+    }
+
+    this.sprite = scene.add.graphics()
+    this.healthBar = scene.add.graphics()
+    this.quoteText = scene.add
+      .text(this.x, this.y - 30, this.getQuote(), {
+        fontFamily: 'VT323, monospace',
+        fontSize: '12px',
+        color: '#FFFFFF',
+        backgroundColor: 'rgba(0,0,0,0.6)',
+        padding: { x: 3, y: 2 },
+      })
+      .setOrigin(0.5, 1)
+      .setDepth(15)
+      .setAlpha(0)
+
+    this.drawSprite()
+    this.drawHealthBar()
+  }
+
+  update(delta: number): void {
+    if (this.isDead || !this.isActive) return
+    this.processDOT(delta)
+    if (this.slowTimer > 0) {
+      this.slowTimer -= delta
+      if (this.slowTimer <= 0) this.slowEffect = 0
+    }
+    this.moveAlongPath(delta)
+    this.drawHealthBar()
+    this.sprite.setPosition(this.x, this.y)
+  }
+
+  protected processDOT(delta: number): void {
+    for (let i = this.dotEffects.length - 1; i >= 0; i--) {
+      const dot = this.dotEffects[i]
+      dot.timer -= delta
+      const tickDamage = (dot.damage / 1000) * delta
+      this.hp -= tickDamage
+      if (this.hp <= 0) {
+        this.die()
+        return
+      }
+      if (dot.timer <= 0) {
+        this.dotEffects.splice(i, 1)
+      }
+    }
+  }
+
+  protected moveAlongPath(delta: number): void {
+    if (this.currentPathIndex >= this.pathPoints.length - 1) {
+      this.reachEnd()
+      return
+    }
+    const target = this.pathPoints[this.currentPathIndex + 1]
+    const currentSpeed = this.speed * (1 - this.slowEffect)
+    const distance = (currentSpeed * delta) / 1000
+
+    const dx = target.x - this.x
+    const dy = target.y - this.y
+    const dist = Math.sqrt(dx * dx + dy * dy)
+
+    if (dist <= distance) {
+      this.x = target.x
+      this.y = target.y
+      this.currentPathIndex++
+    } else {
+      this.x += (dx / dist) * distance
+      this.y += (dy / dist) * distance
+    }
+  }
+
+  protected drawHealthBar(): void {
+    this.healthBar.clear()
+    const bw = 30
+    const bh = 4
+    const bx = this.x - bw / 2
+    const by = this.y - 20
+    const ratio = Math.max(0, this.hp / this.maxHp)
+    const color = ratio > 0.5 ? 0x22c55e : ratio > 0.25 ? 0xf59e0b : 0xef4444
+
+    this.healthBar.fillStyle(0x374151, 1)
+    this.healthBar.fillRect(bx, by, bw, bh)
+    this.healthBar.fillStyle(color, 1)
+    this.healthBar.fillRect(bx, by, bw * ratio, bh)
+    this.healthBar.setDepth(14)
+  }
+
+  takeDamage(damage: number): void {
+    if (this.isDead) return
+    if (this.shieldCount > 0) {
+      this.shieldCount--
+      this.showShieldBlock()
+      return
+    }
+    this.hp -= damage
+    this.drawHealthBar()
+    if (this.hp <= 0) {
+      this.die()
+    }
+  }
+
+  private showShieldBlock(): void {
+    const txt = this.scene.add
+      .text(this.x, this.y - 35, '护盾!', {
+        fontFamily: 'VT323, monospace',
+        fontSize: '14px',
+        color: '#93C5FD',
+      })
+      .setOrigin(0.5, 1)
+      .setDepth(20)
+    this.scene.tweens.add({
+      targets: txt,
+      y: this.y - 55,
+      alpha: 0,
+      duration: 800,
+      onComplete: () => txt.destroy(),
+    })
+  }
+
+  addDOT(damage: number, duration: number): void {
+    this.dotEffects.push({ damage, duration, timer: duration })
+  }
+
+  addSlow(percent: number, duration: number): void {
+    this.slowEffect = Math.max(this.slowEffect, percent)
+    this.slowTimer = Math.max(this.slowTimer, duration)
+  }
+
+  protected die(): void {
+    if (this.isDead) return
+    this.isDead = true
+    const manager = GameManager.getInstance()
+    manager.addHC(this.hcReward)
+    this.onDeath()
+    this.destroy()
+  }
+
+  protected reachEnd(): void {
+    if (this.isDead) return
+    const manager = GameManager.getInstance()
+    manager.reduceKPI(this.kpiDamage)
+    this.isDead = true
+    this.destroy()
+  }
+
+  protected onDeath(): void {}
+
+  /** 显示头顶语录（短暂） */
+  showQuote(): void {
+    this.quoteText.setText(this.getQuote())
+    this.quoteText.setAlpha(1)
+    this.scene.time.delayedCall(1500, () => {
+      if (this.quoteText) this.quoteText.setAlpha(0)
+    })
+  }
+
+  abstract drawSprite(): void
+  abstract getQuote(): string
+
+  destroy(): void {
+    this.sprite?.destroy()
+    this.healthBar?.destroy()
+    this.quoteText?.destroy()
+  }
+}