Group

Introduction¶

Objects pool, built-in game object of phaser.

Author: Richard Davey

Usage¶

Add group object¶

var group = scene.add.group(config);
// var group = scene.add.group(gameObjects, config);  // Add game objects into group

config

{
    classType: Phaser.GameObjects.Sprite,
    defaultKey: null,
    defaultFrame: null,
    active: true,
    maxSize: -1,
    runChildUpdate: false,
    createCallback: null,
    removeCallback: null,
    createMultipleCallback: null
}

classType :
- Sprite : Phaser.GameObjects.Sprite
- Image : Phaser.GameObjects.Image
runChildUpdate : Set true to run gameObject.update() every tick.
createCallback : A function to be called when adding or creating group members.
```
var callback = function(gameObject) {
}
```
removeCallback : A function to be called when removing group members.
```
var callback = function(gameObject) {
}
```
createMultipleCallback : A function to be called when creating several group members at once.
```
var callback = function(gameObjects) {
}
```

Add game object¶

group.add(gameObject);
// group.add(gameObject, true);  // add this game object to display and update list of scene

group.addMultiple(gameObjects);   // array of game objects
// group.addMultiple(gameObjects, true);

Game object will only be added once.
Game object will be removed automatically when destroyed.

Remove game object¶

group.remove(gameObject);
// group.remove(gameObject, true);  // also remove this game object from display and update list of scene

Remove all game objects

group.clear();
// group.clear(removeFromScene, destroyChild);

Get game objects¶

Get all game objects.

var gameObjects = group.getChildren();  // array of game objects

Get all matching game objects

var gameObjects = group.getMatching(property, value);
// var gameObjects = group.getMatching(property, value, startIndex, endIndex);

Amount of game objects.
```
var len = group.getLength();
```
Group is full. Maximun size is set in maxSize.
```
var isFull = group.isFull();
```
Game object is in group.
```
var isInGroup = group.contains(child);
```

Group actions¶

Property¶

Set property

group.propertyValueSet(key, value);
// group.propertyValueSet(key, value, step, index, direction);

direction :
- 1 : From beginning to end
- -1 : From end to beginning

Increase property

group.propertyValueInc(key, value);
// group.propertyValueInc(key, value, step, index, direction);

direction :
- 1 : From beginning to end
- -1 : From end to beginning

Position¶

Set Position

group.setX(value);
// group.setX(value, step);
group.setX(value);
// group.setY(value, step);
group.setXY(x, y);
// group.setXY(x, y, stepX, stepY);

Increase Position

group.incX(value);
// group.incX(value, step);
group.incY(value);
// group.incY(value, step);
group.incXY(x, y);
// group.incXY(x, y, stepX, stepY);

Shift position

group.shiftPosition(x, y);
// group.shiftPosition(x, y, direction);

direction :
- 0 : First to last
- 1 : Last to first

Angle¶

Set angle

group.angle(value);
// group.angle(value, step);

group.rotate(value);
// group.rotate(value, step);

Rotate around

group.rotateAround(point, angle);

group.rotateAroundDistance(point, angle, distance);

Visible¶

Set visible
```
group.setVisible(value);
// group.setVisible(value, index, direction);
```
- index : An optional offset to start searching from within the items array.
- direction : The direction to iterate through the array.
  - 1 : From beginning to end
  - -1 : From end to beginning
Toggle visible
```
group.toggleVisible();
```

Alpha¶

Set alpha

group.setAlpha(value);
// group.setAlpha(value, step);

Tint¶

Set tint

group.setTint(value);
// group.setTint(topLeft, topRight, bottomLeft, bottomRight);

Blend mode¶

Set blend mode
```
group.setBlendMode(value);
```

Scale¶

Set scale

group.scaleX(value);
// group.scaleX(value, step);
group.scaleY(value);
// group.scaleY(value, step);
group.scaleXY(scaleX, scaleY);
// group.scaleXY(scaleX, scaleY, stepX, stepY);

Origin¶

Set origin

group.setOrigin(originX, originY);
// group.setOrigin(originX, originY, stepX, stepY);

Depth¶

Set depth
```
group.setDepth(value, step);
```

Animation¶

Play animation
```
group.playAnimation(key, startFrame);
```

Hit area¶

Set hit-area

group.setHitArea();
// group.setHitArea(hitArea, hitAreaCallback);

Shuffle¶

Shuffle array
```
group.shuffle();
```

Active/inactive game objects¶

Set inactive

group.kill(gameObject);         // gameObject.setActive(false)
group.killAndHide(gameObject);  // gameObject.setActive(false).setVisible(false)

Amount of active game objects

var activeCount = group.countActive();

or

var activeCount = group.getTotalUsed();

Amount of active game objects

var inactiveCount = group.countActive(false);

Amount of free (maxSize - activeCount) game objects

var freeCount = group.getTotalFree();  // group.maxSize - group.getTotalUsed()

Get first active/inactive game object,

Return null if no game object picked.

var gameObject = group.getFirst(active);  // active = true/false
var gameObject = group.getFirstAlive(); // Equal to group.getFirst(true, ...)
var gameObject = group.getFirstDead(); // Equal to group.getFirst(false, ...)

Create one if no game object picked.

var gameObject = group.getFirst(active, true, x, y, key, frame, visible);  // active = true/false
var gameObject = group.getFirstAlive(true, x, y, key, frame, visible); // Equal to group.getFirst(true, ...)
var gameObject = group.getFirstDead(true, x, y, key, frame, visible); // Equal to group.getFirst(false, ...)
var gameObject = group.get(x, y, key, frame, visible); // Equal to group.getFirst(false, true, ...)

Use (x, y, key, frame) to create Image/Sprite game object.

var newGameObject = new GameObjectClass(x, y, key, frame);

Create game objects¶

var gameObjects = group.createFromConfig(config);
var gameObjects = group.createMultiple(config);    // config in array

config

{
    classType: this.classType,
    key: undefined,             // Required
    frame: null,
    visible: true,
    active: true,
    repeat: 0,                  // Create (1 + repeat) game objects
    createCallback: undefined,  // Override this.createCallback if not undefined

    // Position
    setXY: {
        x:0,
        y:0,
        stepX:0,
        stepY:0
    },
    // Actions.SetXY(gameObjects, x, y, stepX, stepY)
    gridAlign: false,
    // {
    //     width: -1,
    //     height: -1,
    //     cellWidth: 1,
    //     cellHeight: 1,
    //     position: Phaser.Display.Align.TOP_LEFT,
    //     x: 0,
    //     y: 0
    // }
    // Actions.GridAlign(gameObjects, gridAlign)

    // Angle
    setRotation: {
        value: 0,
        step:
    },
    // Actions.SetRotation(gameObjects, value, step)

    // Scale
    setScale: {
        x:0,
        y:0,
        stepX:0,
        stepY:0
    },
    // Actions.SetScale(gameObjects, x, y, stepX, stepY)

    // Alpha
    setAlpha: {
        value: 0,
        step:
    },
    // Actions.SetAlpha(gameObjects, value, step)

    setOrigin: {
        x:0,
        y:0,
        stepX:0, 
        stepY:0
    },

    // Input
    hitArea: null,
    hitAreaCallback: null,
    // Actions.SetHitArea(gameObjects, hitArea, hitAreaCallback)
}

classType :
- Sprite: Phaser.GameObjects.Sprite
- Image: Phaser.GameObjects.Image

Destroy¶

Destroy group only
```
group.destroy();
```
Destroy group and children
```
group.destroy(true);
```