Deflate

var config = {
    width: 800,
    height: 600,
    type: Phaser.AUTO,
    parent: 'phaser-example',
    scene: {
        create: create
    }
};

var game = new Phaser.Game(config);

function create ()
{
    var graphics = this.add.graphics({ lineStyle: { width: 2, color: 0x00ff00 }, fillStyle: { color: 0xff0000 }});

    var rect = new Phaser.Geom.Rectangle(100, 100, 400, 400);

    //  The green rectangle is the original one
    graphics.strokeRectShape(rect);

    Phaser.Geom.Rectangle.Inflate(rect, -128, -128);

    //  Draw the now deflated rectangle in yellow
    graphics.lineStyle(2, 0xffff00);

    graphics.strokeRectShape(rect);
}
                        

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