package { import flash.display.Sprite; public class Hero extends Sprite { public var vx:Number; public var vy:Number; public function Hero():void { vx = 0; vy = 0; graphics.beginFill(0x00FF00); graphics.drawCircle(0, 0, 20); graphics.endFill(); } public function update():void { x += vx; y += vy; } } }