Union

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: 0x0000aa, alpha: 0.6 }, fillStyle: { color: 0x00aa00, alpha: 0.7 } });

    var baseRect = new Phaser.Geom.Rectangle(350, 250, 100, 100);
    var pointerRect = new Phaser.Geom.Rectangle(0, 0, 25, 25);

    var rectangles = [];

    this.input.on('pointermove', function (pointer) {

        Phaser.Geom.Rectangle.CenterOn(pointerRect, pointer.x, pointer.y);

        redraw();

    });

    this.input.on('pointerdown', function (pointer) {

        rectangles.push(Phaser.Geom.Rectangle.Union(baseRect, pointerRect));

        redraw();

    });

    redraw();

    function redraw()
    {
        graphics.clear();

        graphics.fillRectShape(baseRect);

        graphics.fillRectShape(pointerRect);

        for (var i = 0; i < rectangles.length; i++)
        {
            graphics.strokeRectShape(rectangles[i]);
        }
    }
}
                        

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