Container Lite

Introduction¶

Control the position and angle of children game objects.

It is inspired from Ziao/phaser3-interim-containers.

Author: Rex
Game object

Live demos¶

Usage¶

Sample code

Install plugin¶

Load minify file¶

Load plugin (minify file) in preload stage

scene.load.plugin('rexcontainerliteplugin', 'https://raw.githubusercontent.com/rexrainbow/phaser3-rex-notes/master/dist/rexcontainerliteplugin.min.js', true);

Add container object

var container = scene.add.rexContainerLite(x, y);

Import plugin¶

Install rex plugins from npm
```
npm i phaser3-rex-plugins
```

Install plugin in configuration of game

import ContainerLitePlugin from 'phaser3-rex-plugins/plugins/containerlite-plugin.js';
var config = {
    // ...
    plugins: {
        global: [{
            key: 'rexContainerLitePlugin',
            plugin: ContainerLitePlugin,
            start: true
        },
        // ...
        ]
    }
    // ...
};
var game = new Phaser.Game(config);

Add container object

var container = scene.add.rexContainerLite(x, y);

Import class¶

Install rex plugins from npm
```
npm i phaser3-rex-plugins
```

Import class

import ContainerLite from 'phaser3-rex-plugins/plugins/containerlite.js';

Add container object

var container = new ContainerLite(scene, x, y);
scene.add.existing(container);

Add container object¶

var container = scene.add.rexContainerLite(x, y);  // width = 1, height = 1
// var container = scene.add.rexContainerLite(x, y, width, height);

or

var container = scene.add.rexContainerLite(x, y, children);  // width = 1, height = 1
// var container = scene.add.rexContainerLite(x, y, width, height, children);

Add container from JSON

var container = scene.make.rexContainerLite({
    x: 0,
    y: 0,
    width: 1,
    height: 1,

    // angle: 0,
    // alpha: 1,
    // scale : {
    //    x: 1,
    //    y: 1
    //},
    // origin: {x: 0.5, y: 0.5},
});

Custom class¶

Define class

class MyContainer extends ContainerLite {
    constructor(scene, x, y, width, height, children) {
        super(scene, x, y, width, height, children);
        // ...
        scene.add.existing(this);
    }
    // ...

    // preUpdate(time, delta) {}
}

scene.add.existing(gameObject) : Adds an existing Game Object to this Scene.
- If the Game Object renders, it will be added to the Display List.
- If it has a preUpdate method, it will be added to the Update List.

Create instance

var container = new MyContainer(scene, x, y, width, height, children);

Destroy¶

container.destroy();

Also destroy all children.

Other properties¶

This container game object inherits from Zone.

Add child¶

Pin¶

Add(pin) a game obejct to container

container.add(child);  // child: a game object
// container.pin(child);

child : A game object

or

container.pin(child, {
    // syncPosition: true,
    // syncRotation: true,
    // syncScale : true,
    // syncAlpha: true,
    // syncScrollFactor: true,
});

child : A game object
syncPosition :
- true : Sync position of child, default behavior.
- false : Don't sync position of child.
syncRotation :
- true : Sync angle of child, default behavior.
- false : Don't sync angle of child.
syncScale :
- true : Sync scale of child, default behavior.
- false : Don't sync angle of child.
syncAlpha :
- true : Sync alpha of child, default behavior.
- false : Don't sync alpha of child.
syncScrollFactor :
- true : Sync scrollFactor of child, default behavior.
- false : Don't sync scrollFactor of child.

Or add(pin) children

container.addMultiple(children);
// container.add(children);

children : An array of game objects

These world properties of children will be changed with container.

Position/Angle/Scale
Visible
Alpha
Scroll factor
Mask

Note

Position of child is the world position, i.e. position of child won't be changed when adding to container initially.
- For example, container-lite is at (100, 100), and child is at (110, 110), then child will be placed at (110, 110) after adding to container-lite.
This behavior is different from official container, which using related position of child when adding to container.
- For example, official container is at (100, 100), and child is at (10, 10), then child will be placed at (110, 110) after adding to official container.

Add local¶

container.addLocal(child);

or

container.addLocalMultiple(children);

or

container.pinLocal(child, {
    // syncPosition: true,
    // syncRotation: true,
    // syncScale : true,
    // syncAlpha: true,
});

Add child to container with related properties, like official container.
For example, container-lite is at (100, 100), and child is at (10, 10), then child will be placed at (110, 110) after adding to container-lite.

Remove child¶

Remove(unpin) a child

container.remove(child);
// container.remove(child, destroyChild);

or

container.unpin(child);
// container.unpin(child, destroyChild);

child : Game object
destroyChild : Set true to destroy child. Default is false.

Remove all children

container.clear();
// container.clear(destroyChild);

Get child¶

Get first child by name
```
var gameObject = container.getByName(name);
// var gameObject = container.getByName(name, recursive);
```
- gameObject : A child, or null if not found.
- recursive : Set true to search all children recursively.

Get a random child

var gameObject = container.getRandom();
// var gameObject = container.getRandom(startIndex, length);

Get children in this container-lite

Internal children array

var gameObjects = container.getChildren();

Copy of children array

var gameObjects = container.getChildren([]);
// var gameObjects = container.getChildren(out);

Get all children under this container-lite recursively

var gameObjects = container.getAllChildren();

Put container itself and all children into Layer

layer.add(container.getAllChildren([container]));

Draw on render texture
```
rt.draw(container.getAllChildren());
```

Ignored in camera

camera.ignore(container.getAllChildren());

Traversal¶

Depth-First Search

container.dfs(function(current) {
    // return true;  // Discard children traveraling
})

Return true to discard children traveraling

Breadth-First Search

container.bfs(function(current) {
    // return true;  // Discard children traveraling
})

Return true to discard children traveraling

Exist¶

Return true if child is under this container-lite (nested).

var hasChild = container.contains(child);

Children¶

var children = container.children;

children : Array of child game objects.

Get parent¶

var parentContainer = scene.plugins.get('rexContainerLitePlugin').getParent(child);

or

var parentContainer = Container.GetParent(child); // Static method

Set properties of child¶

Position¶

container.setChildPosition(child, x, y);

Rotation¶

container.setChildRotation(child, rotation);

rotation : Angle in radians.

Scale¶

container.setChildScale(child, scaleX, scaleY);

or

container.setChildDisplaySize(child, width, height);

Visible¶

container.setChildVisible(child, visible);

Alpha¶

container.setChildAlpha(child, alpha);

Local state of child¶

Get local state

var localState = container.getLocalState(child);

or

var localState = child.rexContainer;

Properties of localState
- x, y
- rotation
- scaleX, scaleY
- visible
- alpha

Change local state of child¶

Local position

container.setChildLocalPosition(child, x, y);

Local scale

container.setChildLocalScale(child, scaleX, scaleY);

Local alpha

container.setChildLocalAlpha(child, alpha);

Local visible

container.setChildLocalVisible(child, visible);

Reset local state of child¶

Reset local state of child according to current properties of children

Reset local state of all properties
```
container.resetChildState(child);
```

Reset local state of position

container.resetChildPositionState(child);

Reset local state of rotation

container.resetChildRotationState(child);

Reset local state of scale
```
container.resetChildScaleState(child);
```
Reset local state of alpha
```
container.resetChildAlphaState(child);
```

Reset local state of visible

container.resetChildVisibleState(child);

Reset local state of active

container.resetChildActiveState(child);

Tween local state¶

var tweenObj = container.tweenChild({
    targets: child,
    // x: '+=100',
    // y: '+=100',
    // repeat: -1,
    // yoyo: true
})

targets : A game object, or an array of game object.
- A containerLite child, can tween its local state.

Paramters of configuration is the same as tween task.

Supported properties :

x, y,
angle, rotation
scaleX, scaleY, displayWidth, displayHeight
alpha

Tween local state of a containerlite child¶

var tweenObj = containerLiteChild.tweenSelf({    
    // x: '+=100',
    // y: '+=100',
    // repeat: -1,
    // yoyo: true
})

Equal to

containerLiteChild.tweenChild({
    targets: containerLiteChild,
    // x: '+=100',
    // y: '+=100',
    // repeat: -1,
    // yoyo: true
})

Create tween config¶

var tweenConfig = container.createTweenChildConfig({
     targets: child,
    // x: '+=100',
    // y: '+=100',
    // repeat: -1,
    // yoyo: true
});
scene.tweens.add(tweenConfig);

Input of targets is/are game object(s), will be replaced by local state of game object(S)
Wrap onUpdate callback, to update properties of child according to local state.

Depth¶

Get depth of container
```
var depth = container.depth;
```

Set depth of container

container.setDepth(value, true);
// container.depth = depth;

Set depth of container and all children
```
container.setDepth(value);
```
Bring this container and its children to top
```
container.bringToTop();
```
Swap depth with another container
```
containerA.swapDepth(containerB);
```
Increase of container and all children
```
container.incDepth(value);
```
Move game object below this container and all children
```
container.moveDepthBelow(gameObject);
```
Move game object above this container and all children
```
container.moveDepthAbove(gameObject);
```

Layer¶

A containerLite can have a layer. Current children and new children will draw on this layer, instead of display list of scene.

Enable layer. Do nothing if layer is existed.
```
container.enableLayer();
```
Get layer game object. Will enable layer if layer is not existed.
```
var layer = container.getLayer();
```

Mask¶

Assign mask object to children

container.setMask(mask);  // container.mask = mask;

Remove mask object of children
```
container.clearMask();
```
Remove mask object of children, and destroy mask object
```
container.clearMask(true);
```

Shader effects¶

Apply post-fx pipeline on layer of containerLite.

Snapshot¶

Draw all visible children on a render-texture.
```
var renderTexture = container.snapshot({
    renderTexture: undefined,
    padding: 0
});
```
- renderTexture : Draw on this render-texture
  - undefined : Create a new render-texture
- padding :
  - 0 : No extra padding space. Default value.
  - A number : Add extra padding space around this render-texture.
Draw all visible children on a texture
```
container.snapshot({
    padding: 0,
    saveTexture: textureKey
});
```
- saveTexture : Save render result to texture manager.

Draw bounds¶

Draw bounds of shown game object on a graphics game object
```
container.drawBounds(graphics);
// container.drawBounds(graphics, color);
```
or
```
container.drawBounds(graphics, {
    // color: 0xffffff,
    // lineWidth: 1,
    // padding: 0,
    // drawContainer: true,
    // children: undefined,
});
```
- graphics : Graphics game object
- color : Default value is 0xffffff.
- lineWidth : Default value is 1.
- padding : Extra space around bounds. Default value is 0.
- drawContainer :
  - true : Draw all children game objects included containerLite. Default behavior.
  - false : Draw all children game objects excluded containerLite
- children :
  - Array of game objects : Only draw bounds of these children
  - undefined : Draw bounds of all children

Scroll factor¶

Set scroll factor to children
```
container.setScrollFactor(x, y);
```

Change origin¶

container.changeOrigin(originX, originY);

This method also will reset all local state of children.

Add to container¶

Add to built-in container

p3Container.add(containerLite);

or

containerLite.addToContainer(p3Container);

container : Container game object.

Add to Layer
```
container.addToLayer(layer);
```
- layer : Layer game object.

Note

container.add(containerLite), or layer.add(containerLite) won't add children of containerLite.

Compare with Official Container¶

Position/anlge/scale of a child object :
- Container : Local position/anlge/scale, responding to parent container, not a world position/anlge/scale.
- Container-Lite : World position/anlge/scale.
Updating period
- Container : Re-calculate position/anlge/scale of each child every render.
- Container-Lite: Re-calculate position/anlge/scale of each child when parent container changes position/anlge/scale.
Mask
- Container : It has mask property, and it could become a mask object.
- Container-Lite : It has mask property, but it could not become a mask object.