Change Size

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

var game = new Phaser.Game(config);

function create ()
{
    var circle = new Phaser.Geom.Circle(400, 300, 100);

    var graphics = this.add.graphics({ fillStyle: { color: 0xff0000 } });
    graphics.fillCircleShape(circle);

    circle.diameter = circle.radius;

    graphics.fillStyle(0x00ff00);
    graphics.fillCircleShape(circle);

    circle.radius = 10;

    graphics.fillStyle(0x0000ff);
    graphics.fillCircleShape(circle);
}