What purpose does "Phaser.Display.Align.In.Center" serve when we already have the function `setOrigin` available?

I'm puzzled about the purpose of Phaser.Display.Align.In.Center. The code snippet below is taken from an official example

class Example extends Phaser.Scene
{
  constructor ()
  {
    super();
  }
  preload() {
    this.load.path = 'https://raw.githubusercontent.com/photonstorm/phaser3-examples/master/public/assets/';
    this.load.image('pic', 'pics/barbarian-loading.png');
  }
  create ()
  {
    const pic = this.add.image(400, 300, 'pic');
    //Phaser.Display.Align.In.Center(pic, this.add.zone(400, 300, 800, 600));
  }
}
var config = {
  width: 800,
  height: 600,
backgroundColor: '#666', //0xf3f3f3
  scene: [Example]
}

var game = new Phaser.Game(config);
<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="1e6e767f6d7b6c5e2d302b2b302c">[email protected]</a>/dist/phaser.js"></script>

The line I have commented out is:

//Phaser.Display.Align.In.Center(pic, this.add.zone(400, 300, 800, 600));

Even without using this line, I still achieve the same result - an image centered on the screen.

Considering we already have setOrigin, what exactly is the function of "Phaser.Display.Align.In.Center"?

Answer №1

The Phaser.Display.Align allows for precise object positioning in relation to other objects. The function setOrigin is specifically used to determine the reference point for calculating the coordinates of the object.

This demonstration showcases how an object can be positioned relative to another using Phaser.Display.Align, all without the need to manually set coordinates.

It is particularly useful for aligning images on top of each other, such as clothing items or weapons, and even adding text onto items.

Upon each click, the green rectangle will be repositioned dynamically using Phaser.Display.Align.
(Both Phaser.Display.Align.In and Phaser.Display.Align.To are utilized here to demonstrate their contrasting behaviors).

function create () {
    this.add.text(10,10, 'Click red Cube', '#ffffff')
    rect1 = this.add.rectangle(200, 100, 50, 50, 0xff0000);
    rect2 = this.add.rectangle(-50, -50, 30, 30, 0x00ff00);
    
    Phaser.Display.Align.To.TopCenter(rect2, rect1);
    
    rect1.setInteractive();
    rect1.on('pointerdown', alignObject)
    
  }
  
 function alignObject(){
    switch(alignObjPosition){
      case 0:
        Phaser.Display.Align.In.TopCenter(rect2, rect1);
        break;
      case 1:
        Phaser.Display.Align.In.Center(rect2, rect1);
        break;
      case 2:
        Phaser.Display.Align.In.BottomCenter(rect2, rect1);
        break;
      case 3:
        Phaser.Display.Align.To.BottomCenter(rect2, rect1);
        break;
      case 4:
        Phaser.Display.Align.To.TopCenter(rect2, rect1);

        alignObjPosition = -1;
    }
    alignObjPosition++;
 }
 
var alignObjPosition = 0;
var rect1; 
var rect2; 

var config = {
  width: 400,
  height: 200,
  scene: { create }
}

var game = new Phaser.Game(config);
<script src="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="75a5b9b0abafa8a7e7a6aab5bab3a6bbb3aab59cefaba7">[email protected]</a>/dist/phaser.js"></script>

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