Scroll Factor Drag

var config = {
    type: Phaser.WEBGL,
    parent: 'phaser-example',
    scene: {
        preload: preload,
        create: create
    }
};

var game = new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.image('eye', 'assets/pics/lance-overdose-loader-eye.png');
}

function create ()
{
    var image1 = this.add.sprite(200, 300, 'eye').setInteractive();
    var image2 = this.add.sprite(400, 300, 'eye').setInteractive();
    var image3 = this.add.sprite(600, 300, 'eye').setInteractive();

    this.input.setDraggable([ image1, image2, image3 ]);

    image1.setScrollFactor(1);
    image2.setScrollFactor(0.7);
    image3.setScrollFactor(0.5);

    this.input.on('gameobjectover', function (pointer, gameObject) {

        gameObject.setTint(0x00ff00);

    });

    this.input.on('gameobjectout', function (pointer, gameObject) {

        gameObject.clearTint();

    });

    this.input.on('dragstart', function (pointer, gameObject) {

        gameObject.setTint(0xff0000);

    });

    this.input.on('drag', function (pointer, gameObject, dragX, dragY) {

        gameObject.x = dragX;
        gameObject.y = dragY;

    });

    this.input.on('dragend', function (pointer, gameObject) {

        gameObject.clearTint();

    });
}