Transition image

Introduction¶

Transit texture to another one. A containerLite game object with 2 image game objects.

Author: Rex
Game object

Live demos¶

Ease property of current/next image
- Cross-fade
- Scale
- Slide
Apply shader effect to current/next image, then ease property this shader effect.
- Split
- Dissolve
Grid cut current/next image to cell images, then ease property of cell images
- Grid cut
- 3 columns
Morph custom mask game object
- Pie mask

Usage¶

Sample code

Install plugin¶

Load minify file¶

Load plugin (minify file) in preload stage

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

Add image object

var image = scene.add.rexTransitionImage(x, y, texture, frame, config);

Import plugin¶

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

Install plugin in configuration of game

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

Add image object

var image = scene.add.rexTransitionImage(x, y, texture, frame, config);

Import class¶

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

Import class

import TransitionImage from 'phaser3-rex-plugins/plugins/transitionimage.js';

Add image object

var image = new TransitionImage(scene, x, y, texture, frame, config);
scene.add.existing(image);

Create instance¶

var image = scene.add.rexTransitionImage(x, y, texture, frame, {
    // dir: 0,
    // onStart: function(parent, currentImage, nextImage, t) { },
    // onStartScope: undefined,
    // onProgress: function(parent, currentImage, nextImage, t) { },
    // onProgressScope: undefined,
    // onComplete: function(parent, currentImage, nextImage, t) { },
    // onCompleteScope: undefined,    
    // duration: 1000,
    // ease: 'Linear',
    // mask: undefined,
});

or

var image = scene.add.rexTransitionImage(x, y, texture, frame, {
    // x: 0,
    // y: 0,
    // key: 
    // frame: 
    // dir: 0,
    // onStart: function(parent, currentImage, nextImage, t) { },
    // onStartScope: undefined,
    // onProgress: function(parent, currentImage, nextImage, t) { },
    // onProgressScope: undefined,
    // onComplete: function(parent, currentImage, nextImage, t) { },
    // onCompleteScope: undefined,    
    // duration: 1000,
    // ease: 'Linear',
    // mask: undefined,
});

dir : Transition direction.
- 0, or 'out' : Transit current texture/image out.
- 1, or 'in' : Transit next texture/image in.
onStart, onStartScope : Callback and scope of transition-start. See Set transition callbacks
onProgress, onProgressScope : Callback and scope of transition-progress. See Set transition callbacks
onComplete, onCompleteScope : Callback and scope of transition-complete. See Set transition callbacks
duration : Duration of transition.
ease : Ease function of transition-progress.
mask : Mask game object.
- true : Default graphics game object.
- Any shape game object, or custom shape, custom progress game object.

If onStart, onProgress and onComplete are all undefined, it will use cross-fade as default transition callbacks.

Add transitionimage from JSON

var image = scene.make.rexTransitionImage({
    x: 0,
    y: 0,
    key: null,
    frame: null,

    // dir: 0,
    // onStart: function(parent, currentImage, nextImage, t) { },
    // onStartScope: undefined,
    // onProgress: function(parent, currentImage, nextImage, t) { },
    // onProgressScope: undefined,
    // onComplete: function(parent, currentImage, nextImage, t) { },
    // onCompleteScope: undefined,
    // duration: 1000,
    // ease: 'Linear',
    // mask: undefined,

    // origin: {x: 0.5, y: 0.5},
    add: true
});

Custom class¶

Define class

class MyTransitionImage extends TransitionImage {
    constructor(scene, x, y, texture, frame, config) {
        super(scene, x, y, texture, frame, config);
        // ...
        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 transitionimage = new MyTransitionImage(scene, x, y, texture, frame, config);

Transit¶

image
    // .setTransitionDirection(dir)
    // .setTransitionStartCallback(onStart, onStartScope)
    // .setTransitionProgressCallback(onProgress, onProgressScope)
    // .setTransitionCompleteCallback(onComplete, onCompleteScope)
    // .setDuration(duration)
    // .setEaseFunction(ease)
    // .setMaskEnable(enable)
    .transit(texture, frame)

or

image.transit({
    key: undefined,
    // frame: undefined,
    // dir: 0,
    // onStart: function(parent, currentImage, nextImage, t) { },
    // onStartScope: undefined,
    // onProgress: function(parent, currentImage, nextImage, t) { },
    // onProgressScope: undefined,
    // onComplete: function(parent, currentImage, nextImage, t) { },
    // onCompleteScope: undefined,
    // duration: 1000,
    // ease: 'Linear',
    // mask: undefined,
})

mask : Mask game object.
- true : Default graphics game object. Also apply this mask to current and next textures/images
- Any shape game object, or custom shape, custom progress game object.
  - Apply mask to current texture :
```
image.setCurrentImageMaskEnable();
// image.setCurrentImageMaskEnable(enable, invertAlpha);
```
  - Apply mask to next texture :
```
image.setNextImageMaskEnable();
// image.setNextImageMaskEnable(enable, invertAlpha);
```
  - Apply mask to both current and next trextures :
```
image.setMaskEnable();
// image.setMaskEnable(enable, invertAlpha);
```

Fire 'complete' event when transition completed.

Current texture¶

var textureKey = image.texture.key;
var frameName = image.frame.name;

Set transition callbacks¶

Set transition direction
```
image.setTransitionDirection(dir);
```
- 0, or 'out' : Transit current texture out.
- 1, or 'in' : Transit next texture in.
Set transition-start callback
```
image.setTransitionStartCallback(onStart, onStartScope)
```
- onStart
```
function(parent, currentImage, nextImage, t) { }
```
  - parent : Transition image game object, extends from ContainerLite
  - currentImage : Image game object to display current texture.
  - nextImage : Image game object to display next texture.
  - t : Progress percentage. It is 0 in this case.
Set transition-progress callback
```
image.setTransitionProgressCallback(onProgress, onProgressScope)
```
- onProgress
```
function(parent, currentImage, nextImage, t) { 
    // parent.setChildLocalAlpha(currentImage, 1 - t);
    // parent.setChildLocalScale(currentImage, 1 - t);
    // parent.setChildLocalPosition(currentImage, x, 0);
}
```
  - parent : Transition image game object, extends from ContainerLite
  - currentImage : Image game object to display current texture.
    - Set alpha of currentImage, or nextImage by parent.setChildLocalAlpha(currentImage, alpha).
    - Set scale of currentImage, or nextImage by parent.setChildLocalScale(currentImage, scale).
    - Set position of currentImage, or nextImage by parent.setChildLocalScale(currentImage, x, y).
  - nextImage : Image game object to display next texture.
  - t : Progress percentage. 0~1.
Set transition-complete callback
```
image.setTransitionCompleteCallback(onComplete, onCompleteScope)
```
- onComplete
```
function(parent, currentImage, nextImage, t) { }
```
  - parent : Transition image game object, extends from ContainerLite
  - currentImage : Image game object to display current texture.
  - nextImage : Image game object to display next texture.
  - t : Progress percentage. It is 1 in this case.

Set transition duration¶

image.setDuration(duration);

Set ease function¶

image.setEaseFunction(ease);

ease : Ease function of transition-progress.

Mask¶

Apply mask to current texture :

image.setCurrentImageMaskEnable();
// image.setCurrentImageMaskEnable(enable, invertAlpha);

Apply mask to next texture :

image.setNextImageMaskEnable();
// image.setNextImageMaskEnable(enable, invertAlpha);

Apply mask to both current and next trextures :

image.setMaskEnable();
// image.setMaskEnable(enable, invertAlpha);

Assign default mask game object
```
image.setMaskGameObject(true);
```

Assign custom mask game object

image.setMaskGameObject(maskGameObject);

Grid cut¶

Grid cut texture to cells.

Grid cut current texture :
```
var cellImageGameObjects = image.gridCutCurrentImage(columns, rows);
```
- cellImageGameObjects : Array of cell game objects.
Grid cut next texture :
```
var cellImageGameObjects = image.gridCutNextImage(columns, rows);
```
- cellImageGameObjects : Array of cell game objects.

Get cut cell image game objects, after cutting.

var cellImageGameObjects = image.getCellImages();

Apply mask to cell images

image.setCellImagesMaskEnable();
// image.setCellImagesMaskEnable(enable, invertAlpha);

Cut cell image game objects will be set to invisible after transition complete.

Pause/Resume¶

image.pause();

image.resume();

Stop¶

image.stop();

Also will fire 'complete' event.

Events¶

On complete
```
image.on('complete', function(){
})
```

Flip¶

Flip

image.flipX(value);
image.flipY(value);
image.flip(x, y);

Toggle

image.toggleFlipX();
image.toggleFlipY();

Use cases¶

Ease property of current/next image.
- Scale
- Slide, apply mask to current/next image.
Apply shader effect to current/next image, then ease property this shader effect.
- Dissolve
- Split
Grid cut current/next image to cell images, then ease property of cell images
- Grid cut
- Three-columns, apply mask to cell images.
Morph custom mask game object
- Pie-mask, mask current/next image by a custom-progress game object.