Display Callback Index Effect

const rainbowColor = [0xFF5757, 0xE8A241, 0x97FF7F, 0x52BFFF, 0x995DE8];
let rainbowColorIdx = 0;
let rainbowColorOffset = 0;
let delay = 0;
let rainbowWave = 0;

let jiggleText;
let rainbowText;

class Example extends Phaser.Scene
{
    constructor ()
    {
        super();
    }

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v385');
        this.load.bitmapFont('desyrel', 'assets/fonts/bitmap/desyrel.png', 'assets/fonts/bitmap/desyrel.xml');
    }

    create ()
    {
        jiggleText = this.add.dynamicBitmapText(32, 100, 'desyrel', 'It\'s cold outside,\nthere\'s no kind of atmosphere', 64);

        rainbowText = this.add.dynamicBitmapText(32, 400, 'desyrel', 'HELLO WORLD', 96);

        jiggleText.setDisplayCallback(this.textCallback);

        rainbowText.setDisplayCallback(this.rainbowCallback);
    }

    update()
    {
        rainbowColorIdx = 0;

        if (delay++ === 6)
        {
            rainbowColorOffset = (rainbowColorOffset + 1) % (rainbowColor.length);
            delay = 0;
        }
    }

    rainbowCallback(data)
    {
        data.color = rainbowColor[(rainbowColorOffset + rainbowColorIdx) % rainbowColor.length];
        rainbowColorIdx = (rainbowColorIdx + 1) % (rainbowColor.length);
        data.y = Math.cos(rainbowWave + rainbowColorIdx) * 10;
        rainbowWave += 0.01;

        return data;
    }

    //  data = { color: color, index: index, charCode: charCode, x: x, y: y, scaleX: scaleX, scaleY: scaleY }
    textCallback (data)
    {
        if (data.index >= 5 && data.index <= 8)
        {
            data.x = Phaser.Math.Between(data.x - 2, data.x + 2);
            data.y = Phaser.Math.Between(data.y - 4, data.y + 4);
        }

        return data;
    }

}

const config = {
    type: Phaser.WEBGL,
    parent: 'phaser-example',
    scene: Example
};

const game = new Phaser.Game(config);
                        

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