Question

当您按下W，A，S和D时，我正在使用此代码移动图像。

package
{
    import com.adobe.tvsdk.mediacore.CustomRangeType;
    import flash.display.Bitmap;
    import flash.display.BitmapEncodingColorSpace;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.display.Stage;
    import flash.events.AsyncErrorEvent;
    import flash.events.Event;
    import flash.events.KeyboardEvent;
    import flash.events.NetStatusEvent;
    import flash.events.TimerEvent;
    import flash.media.Video;
    import flash.net.NetConnection;
    import flash.net.NetStream;
    import flash.system.ImageDecodingPolicy;
    import flash.ui.Keyboard;
    import flash.utils.ByteArray;
    import flash.utils.Timer;

    public class Main extends Sprite {

        public var xcoord:int = 50;
        public var ycoord:int = 50;
        public var movingUp:Boolean;
        public var movingDown:Boolean;
        public var movingLeft:Boolean;
        public var movingRight:Boolean;
        public var onFrontPage:Boolean;
        public var onDiner:Boolean;
        public var clock:Timer = new Timer(15, 0);
        // Image Initializations
        public var player:Bitmap = new Assets.hariidle1 as Bitmap;

        public var dinerBackground:Bitmap = new Assets.diner as Bitmap;
        public var hariIdle1:Bitmap = new Assets.hariidle1 as Bitmap;
        public var hariIdle2:Bitmap = new Assets.hariidle2 as Bitmap;

        public function Main():void {       
            if (stage){
                init();
            } else {
                addEventListener(Event.ADDED_TO_STAGE, init);   
            }

            // Set booleans to true

            onFrontPage = true;


            addChild(Assets.video);

            var nc:NetConnection = new NetConnection();
            nc.addEventListener(NetStatusEvent.NET_STATUS , onConnect);
            nc.addEventListener(AsyncErrorEvent.ASYNC_ERROR , trace);


            var metaSniffer:Object=new Object();  
            nc.client=metaSniffer;
            metaSniffer.onMetaData=getMeta;
            nc.connect(null);

        } 
        public function init(e:Event = null):void {
            stage.removeEventListener(Event.ADDED_TO_STAGE, init);
            stage.addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
            stage.addEventListener(KeyboardEvent.KEY_UP, onKeyUp);
            clock.addEventListener(TimerEvent.TIMER, gameLoop); 
            clock.start();

        }
        private function asyncErrorHandler(event:AsyncErrorEvent):void { 
            // ignore error 
        }
        private function getMeta (mdata:Object):void {
            Assets.video.width=1280;
            Assets.video.height=720;
        };

        private function onConnect(e:NetStatusEvent):void {
            if (e.info.code == 'NetConnection.Connect.Success') {
                trace(e.target as NetConnection);
                var ns:NetStream = new NetStream(e.target as NetConnection);

                ns.client = {};
                var file:ByteArray = new Assets.bytes();
                ns.play(null);

                ns.appendBytes(file);
                Assets.video.attachNetStream(ns);
            }

        }
        private function gameLoop(evt:Event):void {


                // Draw diner background
                if (!onFrontPage && !onDiner){
                    onDiner = true;
                    addChild(dinerBackground);
                    addChild(player);
                }
                if (!onFrontPage){
                    removeChild(Assets.video);
                }
                if (movingUp){
                    player.y += 50;
                    moveUp();
                }
                if (movingDown){
                    player.y -= 50;
                    moveDown();
                }
                if (movingLeft){
                    player.x += 50;
                    moveLeft();
                }
                if (movingRight){
                    player.x -= 50;
                    moveRight();
                }               
        }
        public function moveUp():void {
            player.y += 50;
        }
        public function moveDown():void {
            player.y -= 50;
        }
        public function moveLeft():void {
            player.x += 50;
        }       
        public function moveRight():void {
            player.x -= 50;
        }
        public function onKeyDown(e:KeyboardEvent):void {
            if (onFrontPage){
                onFrontPage = false;
            }
            if (e.keyCode == 87){
                movingUp = true;
            }
            if (e.keyCode == 83){
                movingDown = true;
            }
            if (e.keyCode == 65){
                movingLeft = true;
            }
            if (e.keyCode == 68){
                movingRight = true;
            }
        }
        public function onKeyUp(e:KeyboardEvent):void {
            if (e.keyCode == 87){
                movingUp = false;
            }
            if (e.keyCode == 83){
                movingDown = false;
            }
            if (e.keyCode == 65){
                movingLeft = false;
            }
            if (e.keyCode == 68){
                movingRight = false;
            }   
        }
    }

}

还有另一个名为Assets的类，它初始化了所有图像。按下W，A，S和D时，图像“播放器”不移动。

按箭头键如何让图像移动？

编辑：我已将代码更改为建议的内容。角色仍然不动。

Answer 1

你的旗帜全都搞砸了。您的代码应在keyUP事件上将其设置为false，并在keydown事件上将其设置为true。此外，您还在keydown上添加了两个侦听器，一个将标志设置为true，另一个设置为false。下定决心！

作为旁注，不需要在游戏循环中调用addChild()，这些应该在侦听器中处理半永久性对象，如玩家。

最后，你在构造函数中调用stage，点击＆＃34;舞台不可用＆＃34;并使你的听众不能完全工作。您应该将此代码用作Main()中的唯一代码：

public function Main():void {           
    if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE, init);
}

你的init函数应该像这样开始：

public function init(e:Event=null):void {
   removeEventListener(Event.ADDED_TO_STAGE, init);

...然后包含Main中的所有代码。一旦你完成了所有这些，你可能会让你的运动工作。

最后，永远不要进行货物编码，并始终考虑您的代码所做的以及何时调用，甚至在您进行编译之前。

让图像在AS3中移动

1 个答案: