Refactor Player entity to use sprite-based rendering with animations

- Replaced simple circle/rectangle graphics with a spritesheet-based player sprite.
- Added animation definitions for idle, walk, idle-gun, and walk-gun states.
- Implemented state tracking (`_isMoving`, `_isShooting`) to drive animation switching.
- Adjusted barrel position calculation to use `GUN_TIP_DIST` for bullet spawning.
- Updated invincibility tween and cleanup logic to target the new sprite object.
- Added sprite loading in GameScene preload phase.

js/entities/Player.js

@@ -2,10 +2,11 @@ const TURN_RATE_DEG = 4;       // degrees per frame at 60fps
 const BULLET_SPEED = 700;
 const BULLET_DAMAGE = 20;
 const BULLET_SIZE = 5;
-const INVINCIBILITY_MS = 1500;
 const PLAYER_RADIUS = 16;
-const PLAYER_COLOR = 0x00ccff;
-const BARREL_LENGTH = 22;
+// Sprite faces DOWN at rotation=0; Phaser's 0° is RIGHT, so offset by -90°
+const SPRITE_ROTATION_OFFSET = -Math.PI / 2;
+// Gun tip distance from sprite center (in pixels)
+const GUN_TIP_DIST = 24;
 
 export class Player {
   constructor(scene, x, y) {
@@ -26,18 +27,32 @@ export class Player {
     this.invincible = false;
     this._fireCooldown = 0;
     this._baseFireInterval = 250; // ms between shots
+    this._isMoving = false;
+    this._isShooting = false;
 
-    this._buildGraphics(x, y);
+    this._createAnims();
+    this._buildSprite(x, y);
     this._setupKeys();
     this.bullets = scene.add.group();
   }
 
-  _buildGraphics(x, y) {
-    this.body = this.scene.add.circle(x, y, PLAYER_RADIUS, PLAYER_COLOR);
-    this.barrel = this.scene.add.rectangle(x + BARREL_LENGTH / 2, y, BARREL_LENGTH, 5, 0x0088cc);
-    this.scene.physics.add.existing(this.body);
-    this.body.body.setCollideWorldBounds(true);
-    this.body.body.setCircle(PLAYER_RADIUS);
+  _createAnims() {
+    const anims = this.scene.anims;
+    if (anims.exists('player-idle')) return; // already created
+
+    anims.create({ key: 'player-idle',     frames: [{ key: 'player', frame: 0 }],                                        frameRate: 1,  repeat: -1 });
+    anims.create({ key: 'player-walk',     frames: anims.generateFrameNumbers('player', { frames: [1, 2] }),              frameRate: 8,  repeat: -1 });
+    anims.create({ key: 'player-idle-gun', frames: [{ key: 'player', frame: 3 }],                                        frameRate: 1,  repeat: -1 });
+    anims.create({ key: 'player-walk-gun', frames: anims.generateFrameNumbers('player', { frames: [4, 5] }),              frameRate: 8,  repeat: -1 });
+  }
+
+  _buildSprite(x, y) {
+    this.sprite = this.scene.add.sprite(x, y, 'player');
+    this.scene.physics.add.existing(this.sprite);
+    this.sprite.body.setCollideWorldBounds(true);
+    // Circle hitbox centered in the 48×48 sprite: radius 16, offset 8 from top-left
+    this.sprite.body.setCircle(PLAYER_RADIUS, 8, 8);
+    this.sprite.play('player-idle');
   }
 
   _setupKeys() {
@@ -49,15 +64,15 @@ export class Player {
     });
   }
 
-  get x() { return this.body.x; }
-  get y() { return this.body.y; }
-  get active() { return this.body.active; }
+  get x() { return this.sprite.x; }
+  get y() { return this.sprite.y; }
+  get active() { return this.sprite?.active ?? false; }
 
   update(delta) {
     this._move();
     this._rotateFacing(delta);
-    this._updateBarrel();
     this._handleFire(delta);
+    this._updateAnimation();
     this._updateBullets();
   }
 
@@ -68,8 +83,9 @@ export class Player {
     if (this.keys.up.isDown)    dy -= 1;
     if (this.keys.down.isDown)  dy += 1;
 
+    this._isMoving = dx !== 0 || dy !== 0;
     if (dx !== 0 && dy !== 0) { dx *= 0.707; dy *= 0.707; }
-    this.body.body.setVelocity(dx * this.stats.speed, dy * this.stats.speed);
+    this.sprite.body.setVelocity(dx * this.stats.speed, dy * this.stats.speed);
   }
 
   _rotateFacing(delta) {
@@ -77,27 +93,35 @@ export class Player {
     const targetAngle = Phaser.Math.Angle.Between(this.x, this.y, ptr.worldX, ptr.worldY);
     const maxTurn = Phaser.Math.DegToRad(TURN_RATE_DEG) * (delta / (1000 / 60));
     this.facing = Phaser.Math.Angle.RotateTo(this.facing, targetAngle, maxTurn);
-  }
-
-  _updateBarrel() {
-    const bx = this.x + Math.cos(this.facing) * (PLAYER_RADIUS + BARREL_LENGTH / 2);
-    const by = this.y + Math.sin(this.facing) * (PLAYER_RADIUS + BARREL_LENGTH / 2);
-    this.barrel.setPosition(bx, by);
-    this.barrel.setRotation(this.facing);
+    // Sprite art faces DOWN; offset by -90° so it faces RIGHT at facing=0
+    this.sprite.setRotation(this.facing + SPRITE_ROTATION_OFFSET);
   }
 
   _handleFire(delta) {
     this._fireCooldown -= delta;
     const ptr = this.scene.input.activePointer;
+    this._isShooting = ptr.isDown;
     if (ptr.isDown && this._fireCooldown <= 0) {
       this._fireCooldown = this._baseFireInterval / this.stats.fireRate;
       this._spawnBullet();
     }
   }
 
+  _updateAnimation() {
+    let key;
+    if (this._isMoving && this._isShooting)       key = 'player-walk-gun';
+    else if (this._isMoving)                       key = 'player-walk';
+    else if (this._isShooting)                     key = 'player-idle-gun';
+    else                                           key = 'player-idle';
+
+    if (this.sprite.anims.currentAnim?.key !== key) {
+      this.sprite.play(key);
+    }
+  }
+
   _spawnBullet() {
-    const bx = this.x + Math.cos(this.facing) * (PLAYER_RADIUS + BARREL_LENGTH);
-    const by = this.y + Math.sin(this.facing) * (PLAYER_RADIUS + BARREL_LENGTH);
+    const bx = this.x + Math.cos(this.facing) * GUN_TIP_DIST;
+    const by = this.y + Math.sin(this.facing) * GUN_TIP_DIST;
     const bullet = this.scene.add.circle(bx, by, BULLET_SIZE, 0xffff00);
     this.scene.physics.add.existing(bullet);
     bullet.body.setVelocity(
@@ -141,31 +165,27 @@ export class Player {
 
   _startInvincibility() {
     this.invincible = true;
-    // Flash effect
     this.scene.tweens.add({
-      targets: [this.body, this.barrel],
+      targets: this.sprite,
       alpha: 0,
       duration: 150,
       yoyo: true,
       repeat: 4,
       onComplete: () => {
-        this.body.setAlpha(1);
-        this.barrel.setAlpha(1);
+        this.sprite.setAlpha(1);
         this.invincible = false;
       }
     });
   }
 
   respawn(x, y) {
-    this.body.setPosition(x, y);
-    this.barrel.setPosition(x, y);
+    this.sprite.setPosition(x, y);
     this.hp = this.stats.maxHp;
     this._startInvincibility();
   }
 
   destroy() {
-    this.body.destroy();
-    this.barrel.destroy();
+    this.sprite.destroy();
     this.bullets.clear(true, true);
   }
 }

js/scenes/GameScene.js

@@ -13,6 +13,7 @@ export class GameScene extends Phaser.Scene {
   preload() {
     this.load.json('zones', './js/data/zones.json');
     this.load.json('skillTree', './js/data/skillTree.json');
+    this.load.spritesheet('player', './assets/sprites/player.png', { frameWidth: 48, frameHeight: 48 });
   }
 
   create() {