Points, life, difficulty and GAME OVER

src/classes/Asteroid.ts

@@ -49,6 +49,7 @@ export default class Asteroid extends Phaser.Physics.Arcade.Sprite {
     if (!(bullet instanceof Bullet)) return
     if (bullet.active == false) return
 
+    me.scene.events.emit("asteroid:destroy")
     me.destroy() // TODO: use objects pool
     bullet.setActive(false)
     bullet.setVisible(false)

src/classes/DifficultyManager.ts

@@ -0,0 +1,55 @@
+import DefaultScene from '../scenes/DefaultScene'
+
+export default class DifficultyManager {
+  readonly spawnInterval = 1500 //ms
+  readonly maxAsteroids = 300
+  readonly intervalDecrementPerLevel = 30
+
+  private scene: DefaultScene
+  private difficultyLevel = 1
+  private points = 0
+
+  private spawnAtOnce = 1
+
+  constructor(scene: DefaultScene) {
+    this.scene = scene
+
+    scene.events.on('asteroid:destroy', () => {
+      this.points += 1
+      this.scene.events.emit("getpoint", this.difficultyLevel)
+
+      if (this.points % 10 == 0)
+        this.levelUp()
+    })
+
+    scene.time.addEvent({
+      delay: this.spawnInterval,
+      callback: this.spawnAsteroids,
+      callbackScope: this,
+      repeat: -1
+    });
+  }
+
+  levelUp() {
+    this.difficultyLevel += 1
+    this.spawnAtOnce += 1
+    this.scene.events.emit("lvlup", this.difficultyLevel)
+  }
+
+  spawnAsteroids() {
+    for (let i = 0; i < this.spawnAtOnce; ++i)
+      this.scene.spawnAsteroid()
+  }
+
+  getMaxAsteroids() {
+    return Math.min(this.difficultyLevel * 5, this.maxAsteroids)
+  }
+
+  getLevel() {
+    return this.difficultyLevel
+  }
+
+  getPoints() {
+    return this.points
+  }
+}

src/classes/Ship.ts

@@ -15,6 +15,7 @@ export default class Ship extends Phaser.Physics.Arcade.Sprite {
 
   bullets: Bullets
   thruster: Thruster
+  life = 3
 
   constructor(scene: Phaser.Scene) {
     super(
@@ -72,8 +73,14 @@ export default class Ship extends Phaser.Physics.Arcade.Sprite {
     if (!(asteroid instanceof Asteroid)) return
 
     if (asteroid.age > Asteroid.unbornAge) {
-      console.log("%cU ded", "color:red")
+      this.life -= 1
       this.scene.cameras.main.shake(100, 0.02)
+      asteroid.destroy() //TODO: use objects pool
+      this.scene.events.emit("ship:gothit")
+    }
+    
+    if (!this.life){
+      this.scene.events.emit("ship:destroyed")
     }
   }
 }

src/scenes/DefaultScene.ts

@@ -1,6 +1,7 @@
 import Phaser from 'phaser'
 import Ship from '../classes/Ship'
 import Asteroid from '../classes/Asteroid'
+import DifficultyManager from '../classes/DifficultyManager'
 
 export default class DefaultScene extends Phaser.Scene {
   readonly maxAsteroids = 70
@@ -8,6 +9,9 @@ export default class DefaultScene extends Phaser.Scene {
   player?: Ship
   rotFrames?: Phaser.Types.Animations.AnimationFrame[]
   asteroids?: Phaser.GameObjects.Group
+  difficulty?: DifficultyManager
+  points = 0
+  progressLabel?: Phaser.GameObjects.Text
 
   constructor() {
     super('default-scene')
@@ -23,27 +27,45 @@ export default class DefaultScene extends Phaser.Scene {
   }
 
   create() {
-    this.asteroids = this.add.group()
-
     Asteroid.createAnimations(this)
+    this.difficulty = new DifficultyManager(this)
+    this.events.on('getpoint', this.updateLabel, this)
+    this.events.on('lvlup', this.updateLabel, this)
+    this.events.on('ship:gothit', this.updateLabel, this)
+    this.events.on('ship:destroyed', this.gameOver, this)
+
     this.add.image(400, 300, 'sky')
-
+    this.asteroids = this.add.group()
     this.player = new Ship(this)
-    this.time.addEvent({
-      delay: 1500,  // ms
-      callback: this.spawnAsteroids,
-      callbackScope: this,
-      repeat: -1
-    });
+    this.progressLabel = this.add.text(5, 5, "", {
+      font: '32px Arial',
+      color: 'cyan'
+    })
+    this.progressLabel.setDepth(1)
 
+    this.updateLabel()
     this.hookupCollisions()
   }
 
-  spawnAsteroids() {
-    if (this.asteroids!.getLength() < this.maxAsteroids)
+  gameOver() {
+    console.log("%cU ded", "color:red")
+    console.log("points: ", this.difficulty!.getPoints())
+  }
+
+  spawnAsteroid() {
+    if (this.asteroids!.getLength() < this.difficulty!.getMaxAsteroids())
       this.asteroids!.add(new Asteroid(this))
   }
 
+  updateLabel() {
+    const lvl = this.difficulty!.getLevel()
+    const pts = this.difficulty!.getPoints()
+    const lives = this.player!.life
+
+    const str = `Level: ${lvl}\tPoints: ${pts}\tHP: ${lives}`
+    this.progressLabel!.text = str
+  }
+
   hookupCollisions() {
     // player - asteroids
     this.physics.add.overlap(