Arcade Physics: Immovable Object Moves when it has circular collision

[hunkydoryrepair]

Version

• Phaser Version: 3.88.0 - 3.88.2

• Operating system: Mac OS and Windows

• Browser: Chrome/all

Description

An immovable object with circular collision will move when an object with rectangular collision collides with it.
This is inconsistent with all earlier versions, and with rectangular objects.
In order to prevent an object from moving in 3.88.1, the body must be set to immovable, and have pushable explicitly set to false AND the object colliding with it must be pushable.

Example Test Code

in comments. the behavior is clear in the separateCircle function of world.js. When object is immovable but pushable, it moves it.

Additional Information

The behavior is USEFUL, but an unnecessary breaking change, and inconsistent with other shapes. setImmovable could set pushable to false, and require it be explicitly enabled, which should prevent it from being a breaking change.

[hunkydoryrepair]

https://jsfiddle.net/eb9ygph5/

const GameScene = new Phaser.Scene();

GameScene.init = function() {};

GameScene.preload = function() {};

GameScene.create = function() {
  const img = this.physics.add.sprite(150, 150, "newmachine");
  img.body.setCircle(50, 0, 0);
  img.body.setImmovable();
  const img2 = this.physics.add.sprite(450, 150, "newmachine");
  img2.body.setSize(50, 50);
  this.physics.add.collider(img2, img);
  img2.body.setVelocity(-20, 0);
  
  // END Collision Detector definitions
};

// UPDATE
GameScene.update = function() {};

const config = {
  type: Phaser.AUTO,
  width: 640,
  height: 480,
  physics: {
    default: 'arcade',
    arcade: {
      debug: true,
    }
  },
  scene: [GameScene]
};

const game = new Phaser.Game(config);

[hunkydoryrepair]

This fiddle shows the behavior did not happen as recently as 3.87.0
https://jsfiddle.net/eb9ygph5/2/

[zekeatchan]

Hi @hunkydoryrepair. Thanks for submitting this issue. We have fixed this and pushed it to the master branch. It will be part of the next release. Do test it out and let us know if you encounter any issues.