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A `graphics` object works well by itself but doesn't work with `Phaser.Display.Align.In.Center`, what am I missing?

I'm trying to center a circle in a given rectangle. One of the approaches to do the job could be graphics working with Phaser.Display.Align.In.Center and I'm having trouble doing that. Here is the code.

class BootScene extends Phaser.Scene {
  constructor() {
    super({
      key: 'BootScene'
    });
  }
  create() {
    let btn = this.add.rectangle(800, 600, 200, 150, '#000').setOrigin(1);
    let txt = this.add.text(0, 0, 'click');
    Phaser.Display.Align.In.Center(txt, btn, );

    let graphics = this.add.graphics({
      x: 750,
      y: 550
    });
    var shape = new Phaser.Geom.Circle(0, 0, 24);
    graphics.fillStyle(0xff0000, 1);
    graphics.fillCircleShape(shape);
    //Phaser.Display.Align.In.Center(graphics, btn);
  }
}

var config = {
  width: 800,
  height: 600,
  backgroundColor: '#555',
  scene: [BootScene]
}

var game = new Phaser.Game(config);

<script src="https://cdn.jsdelivr.net/npm/phaser@3.55.2/dist/phaser.js"></script>

There are 3 visual parts in the code above: the btn rectangle, the txt text and the graphics.

Phaser.Display.Align.In.Center works well with btn and txt.

graphics works well with btn using

this.add.graphics({
      x: 750,
      y: 550
    });

However, if I uncomment the following line below out

Phaser.Display.Align.In.Center(graphics, btn);

the graphics is gone, not matter I set the config as { x: 750, y: 550 } or { x: 0, y: 0 }.

What am I missing?

I know I could use something like

let circle2 = this.add.circle(0, 0, 32, 0xf00000);
Phaser.Display.Align.In.Center(btn_circle, circle2);

I'd just like to know why it doesn't work when I combine graphics and Phaser.Display.Align.In.Center together.

about 4 years ago · Juan Pablo Isaza

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Accepted Answer · 2022-07-04T11:28:11.117Z

Update: it seems to be a bug of phaser (or a mistake in the documentation), since after calling Phaser.Display.Align.In.Center on the graphics object, the x and y properties are set to NaN, and acording the documenation Align should accept a GameObject, which the Graphics object is.

Here is a possible solution:

You could simply generate a texture out of the graphics object, with the function generateTexture on the graphics object
Align the newly created image with the btn
I just added a setDepth call to the txt object, so it would be visible

class BootScene extends Phaser.Scene {
  constructor() {
    super({
      key: 'BootScene'
    });
  }
  create() {
    let btn = this.add.rectangle(300, 175, 200, 150, '#000').setOrigin(1);
    let txt = this.add.text(0, 0, 'click');
    Phaser.Display.Align.In.Center(txt, btn );

    let graphics = this.make.graphics({
      x: 24,
      y: 24,
    });
    var shape = new Phaser.Geom.Circle(24, 24, 24);
    graphics.fillStyle(0xff0000, 1);
    graphics.fillCircleShape(shape);
        
    graphics.generateTexture('gCircle', 48, 48);
    let image = this.add.image(200, 200, 'gCircle');
    Phaser.Display.Align.In.Center(image, btn);

    // only to make the Button visible
    txt.setDepth(2);
            
  }
}

var config = {
  width: 400,
  height: 200,
  backgroundColor: '#555',
  scene: [BootScene]
}

var game = new Phaser.Game(config);

<script src="https://cdn.jsdelivr.net/npm/phaser@3.55.2/dist/phaser.js"></script>

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A `graphics` object works well by itself but doesn't work with `Phaser.Display.Align.In.Center`, what am I missing?

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Andres GPT