flash on 2010-1-9

/**
 * Copyright terra1119 ( http://wonderfl.net/user/terra1119 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/byd5
 */

package {
    import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.KeyboardEvent;
	import flash.ui.Keyboard;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	[SWF(width="465", height="465", frameRate="30", backgroundColor="0x000000")]
    public class ShipSim2 extends Sprite {
		
		private var ship:Ship;
		private var vr:Number = 0;
		private var thrust:Number = 0;
		private var vx:Number = 0;
		private var vy:Number = 0;
		private var friction:Number = 0.97;
		
        public function ShipSim2() {
			init();
        }
		
		private function init():void
		{
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.align = StageAlign.TOP_LEFT;
			ship = new Ship();
			addChild(ship);
			ship.x = stage.stageWidth / 2;
			ship.y = stage.stageHeight / 2;
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
			stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
			stage.addEventListener(KeyboardEvent.KEY_UP, onKeyUp);
			
		}
		
		private function onEnterFrame(e:Event):void 
		{
			ship.rotation += vr;
			var angle:Number = ship.rotation * Math.PI / 180;
			var ax:Number = Math.cos(angle) * thrust;
			var ay:Number = Math.sin(angle) * thrust;
			vx += ax;
			vy += ay;
			vx *= friction;
			vy *= friction;
			ship.x += vx;
			ship.y += vy;
			var left:Number = 0;
			var right:Number = stage.stageWidth;
			var top:Number = 0;
			var bottom:Number = stage.stageHeight;
			if (ship.x - ship.width / 2 > right) {
				ship.x = left - ship.width / 2;
			} else if (ship.x + ship.width / 2 < left) {
				ship.x = right + ship.width / 2;
			}
			if (ship.y - ship.height / 2 > bottom) {
				ship.y = top - ship.height / 2;
			} else if (ship.y < top - ship.height / 2) {
				ship.y = bottom + ship.height / 2;
			}
		}
		
		private function onKeyDown(e:KeyboardEvent):void 
		{
			switch(e.keyCode) {
				case Keyboard.LEFT:
				vr = -5;
				break;
				
				case Keyboard.RIGHT:
				vr = 5;
				break;
				
				case Keyboard.UP:
				thrust = 0.2;
				ship.draw(true);
				break;
				
				default:
				break;
			}
		}
		
		private function onKeyUp(e:KeyboardEvent):void 
		{
			vr = 0;
			thrust = 0;
			ship.draw(false);
		}
    }

}
import flash.display.Sprite;
	class Ship extends Sprite {
		public function Ship() {
			draw(false);
		}
		
		public function draw(showFlame:Boolean):void
		{
			graphics.clear();
			graphics.lineStyle(1, 0xffffff);
			graphics.moveTo(10, 0);
			graphics.lineTo( -10, 10);
			graphics.lineTo( -5, 0);
			graphics.lineTo( -10, -10);
			graphics.lineTo(10, 0);
			if (showFlame) {
				graphics.moveTo( -7.5, -5);
				graphics.lineTo( -15, 0);
				graphics.lineTo( -7.5, 5);
			}
		}
	}