refact

src/entities/obstacles/ObstacleSpikeTricky.ts

@@ -0,0 +1,30 @@
+import Phaser from "phaser";
+
+export class ObstacleSpikeTricky extends Phaser.GameObjects.Image {
+    static readonly TEXTURE_KEY = "spike-tricky";
+    static readonly WIDTH = 40;
+    static readonly HEIGHT = 20;
+    static readonly TRIGGER_DISTANCE = 55;
+    static readonly DISPLACEMENT = 100;
+
+    declare body: Phaser.Physics.Arcade.StaticBody;
+
+    private moved = false;
+
+    constructor(scene: Phaser.Scene, x: number, y: number) {
+        super(scene, x, y, ObstacleSpikeTricky.TEXTURE_KEY);
+        scene.add.existing(this);
+        scene.physics.add.existing(this, true);
+    }
+
+    react(playerX: number): void {
+        if (this.moved) return;
+        const dx = this.x - playerX;
+        if (Math.abs(dx) < ObstacleSpikeTricky.TRIGGER_DISTANCE) {
+            const direction = Math.sign(dx) || 1;
+            this.x += direction * ObstacleSpikeTricky.DISPLACEMENT;
+            this.body.updateFromGameObject();
+            this.moved = true;
+        }
+    }
+}