Simple yet weird rotation problem

[Zuzzi]

Hey guys, I'm newbie of Phaser so I hope you don't get mad for my simple problem.

My code simply moves a tank sprite around the screen, along with rotating its barrel (its childSprite) by using the mouse position...that's it. 

The problem is the barrel: its rotation is completely broken! I used angleToPointer() directly from Phaser.io documentation but I can't find the solution of this problem.

video: broken_rotation.wmv

 

var game = new Phaser.Game(800, 600, Phaser.CANVAS, 'phaser-example', 
									   { preload: preload, create: create, update: update, render: render })

var player;
var barrel;
									   
function preload() {
   game.load.image('tank', 'assets/PNG/Tanks/tankBlue_outline.png');
   game.load.image("barrel", "assets/PNG/Tanks/barrelBlue_outline.png");
}

function create() {
	player = game.add.sprite(200, 200, 'tank');
	player.scale.setTo(0.5, 0.5);
	player.anchor.setTo(0.5, 0.5);
	barrel = new Phaser.Sprite(this.game, 0, 0, "barrel");  
	player.addChild(barrel);
	barrel.anchor.setTo(0,0.5)

}

function update() {


	if (game.input.keyboard.isDown(Phaser.KeyCode.W))
	{
		speed = 3
		var velocityX = Math.cos(player.angle * Math.PI / 180) * speed;
		var velocityY = Math.sin(player.angle * Math.PI / 180) * speed;
		player.x += velocityX;
		player.y += velocityY;	
	}
		
	if (game.input.keyboard.isDown(Phaser.KeyCode.D)) 
	{
		player.angle += 1;
	}
		
	if (game.input.keyboard.isDown(Phaser.KeyCode.A))
	{
		player.angle -= 1;
	}
	
	if (game.input.keyboard.isDown(Phaser.KeyCode.S))
	{
		speed = -2;
		var velocityX = Math.cos(player.angle * Math.PI / 180) * speed;
		var velocityY = Math.sin(player.angle * Math.PI / 180) * speed;
		player.x += velocityX;
		player.y += velocityY;
	}
	
	
	 //barrel.angle += 1   the automatic rotation works perfectly!...
	 barrel.rotation = game.physics.arcade.angleToPointer(barrel);   // ...but not the input one sadly

}

function render() {
	game.debug.spriteInfo(barrel, 20, 32);
	

}

 

 

 

[samme]

Rotating the player also rotates its child. Try

barrel.rotation  = game.physics.arcade.angleToPointer(barrel);
barrel.rotation -= player.rotation;