gistfile1.js

            space: function() {

                var rad = ((this.rotation-90) * Math.PI)/180,
                    dx = 10 * Math.cos(rad),
                    dy = 10 * Math.sin(rad);

                var sprite = Ext.getCmp('theShip').surface.add({
                    type: 'path',
                    stroke: 'green',
                    path: 'M50 50 L40 80 L60 80 Z',
                    rotation: Ext.getCmp('theShip').surface.items.first().attr.rotation
                });

                var posX = this.posX,
                    posY = this.posY;

                var intervalId = setInterval(function () {

                    posX += dx;
                    posY += dy;
                    sprite.setAttributes({
                        translate: {
                            x: posX,
                            y: posY
                        }
                    }, true);


                    if (posX > (Ext.getCmp('theShip').width + sprite.surface.width) ||
                        posY > (Ext.getCmp('theShip').height + sprite.surface.height) ||
                        posX < (0 - Ext.getCmp('theShip').width) ||
                        posY < (0 - Ext.getCmp('theShip').height)
                    ) {
                        clearInterval(intervalId);
                        //console.log('Destroyed at: X: ', posX, ' - And Y: ', posY);
                    } else {
                        //console.log('Currently at: X: ', posX, ' - And Y: ', posY);
                    }

                }, 10);
            },