Actionscript 3 - 如何检查数组位置是否已经存在

Question

您好，我的问题如前所述。我有一个随机生成的带有玩家和随机方块的地牢。地牢中的所有房间都保存在包含房间数据的 ROOMS 二维数组中。您有当前行和当前列，这是玩家所在的位置。我需要知道的是如何说如果当前位置上方没有空间然后更改外墙图形以关闭没有空间的 exits/doors。我有这个有点工作，但每次我改变它总是有一个房间，如果我尝试添加代码就不会工作。我现在有一堆 if 语句说 IF ROOMS[currentRow + 1][currentCol]（< 等于向下）所以如果向上一行存在然后通过执行 gotoAndStop 更改图形。那么如何或哪个是确定位置是否存在的最佳方法，因为有了这个，它会随机卷土重来，并出现 "term is undefined and has no properties." 之类的错误。而且我的代码真的很脏，对不起，我是新手，我稍后会尝试清理它，但如果你们有没有喜欢的，我不会阻止你们哈哈！

感谢您的回复！这是我的房间class

package {
import flash.display.MovieClip;
import flash.events.Event;



public class Room extends MovieClip{

    var room1:Array = new Array();
    var room2:Array = new Array();
    var room3:Array = new Array();
    var room4:Array = new Array();
    var room5:Array = new Array();
    var room6:Array = new Array();
    var room7:Array = new Array();
    var room8:Array = new Array();
    var room9:Array = new Array();
    var room10:Array = new Array();

    var currentRow:int = 0;
    var currentCol:int = 0;

    var box:Box;
    var boxes:Array;
    var ROOMS:Array;
    var onTop:Boolean;
    var moved:Boolean;
    private var player:Player;
    private var walls:Walls;
    private var blocker1:Blocker;
    private var blocker2:Blocker;
    private var blocker3:Blocker;
    private var blocker4:Blocker;
    private var arrowImage:ArrowSymbol;

    public function Room(){
        init();

        createRooms();//add the walls + boxes of first room to the first array value // later make floors array that contains all the rooms and room array that contains all the boxes and enemies + events
        stage.addChild(ROOMS[currentRow][currentCol]);
        Constants.wallsRef = ROOMS[currentRow][currentCol];
        addEventListener(Event.ENTER_FRAME, update);
        stage.addChild(arrowCount);
        stage.addChild(arrowImage);

    }
    function init(){
        Constants.stageRef=stage;
        player = new Player();
        //add walls 
        walls = new Walls();
        Constants.wallsRef=walls;


        blocker1 = new Blocker();//BLOCKER WHEN PLAYER TOUCHES IT CHANGES ROOM
        blocker1.x = 350;
        blocker1.y = 1;
        stage.addChild(blocker1);

        blocker2 = new Blocker();
        blocker2.x = 350;
        blocker2.y = 619;
        stage.addChild(blocker2);

        blocker3 = new Blocker();
        blocker3.x = -30;
        blocker3.y = 300;
        blocker3.rotation = 90;
        stage.addChild(blocker3);

        blocker4 = new Blocker();
        blocker4.x = 700;
        blocker4.y = 300;
        blocker4.rotation = 90;
        stage.addChild(blocker4);

        Constants.blockerRef1 = blocker1;
        Constants.blockerRef2 = blocker2;
        Constants.blockerRef3 = blocker3;
        Constants.blockerRef4 = blocker4;
        //add player

        player.x = 300;
        player.y = 200;
        stage.addChild(player);

        arrowImage = new ArrowSymbol();
        arrowImage.x = 630;
        arrowImage.y = 30;



        box = new Box();
        boxes = new Array();
        ROOMS = new Array([room2],
                          [room6, room1, room5], /// THIS IS THE MAP OF THE FLOOR /// GOING UP ON THE GAME IS GOING DOWN ON IT
                          [room7, room8],
                          [room3, room9],
                          [room4]);//THIS WILL EVENTUALLY BE COMPLETELY RANDOMIZED//

        onTop = false;
        moved = false;

    }

    function update(e:Event){
        arrowCount.text = " " + Constants.arrowNumRef;//arrow amount left
        closeUnnecessaryExits();

        //UP
        if(Constants.blockerRef1.hitTestPoint(player.x,player.y) && moved != true){
            stage.removeChild(ROOMS[currentRow][currentCol]);//remove the room you are in so the new room doesnt overlap
            currentRow++;//change where the player is in
            stage.addChild(ROOMS[currentRow][currentCol]);//add new room
            Constants.wallsRef = ROOMS[currentRow][currentCol];//add colision
            player.y = 600;
            stage.addChild(arrowCount);
            stage.addChild(arrowImage);
            trace();
            moved = true;
        }else if(Constants.playerRef.hitTestObject(Constants.blockerRef1) == false && moved == true){
            moved = false;
        }

        //DOWN
        if(Constants.blockerRef2.hitTestPoint(player.x,player.y) && moved != true){
            //this will be where i want to change rooms
            stage.removeChild(ROOMS[currentRow][currentCol]);
            currentRow--;
            Constants.wallsRef = ROOMS[currentRow][currentCol];
            stage.addChild(ROOMS[currentRow][currentCol]);
            player.y = 10;//change to 600
            moved = true;
            trace("changed rooms");
            stage.addChild(arrowCount);
            stage.addChild(arrowImage);
        }else if(Constants.playerRef.hitTestObject(Constants.blockerRef1) == false && moved == true){
            moved = false;
        }


        //LEFT
        if(Constants.blockerRef3.hitTestPoint(player.x,player.y) && moved != true){
            stage.removeChild(ROOMS[currentRow][currentCol]);//remove the room you are in so the new room doesnt overlap
            currentCol--;//change where the player is in
            stage.addChild(ROOMS[currentRow][currentCol]);//add new room
            Constants.wallsRef = ROOMS[currentRow][currentCol];//add colision
            player.x = 600;
            stage.addChild(arrowCount);
            stage.addChild(arrowImage);
            moved = true;
        }else if(Constants.playerRef.hitTestObject(Constants.blockerRef1) == false && moved == true){
            moved = false;
        }

        //RIGHT
        if(Constants.blockerRef4.hitTestPoint(player.x,player.y) && moved != true){
            //this will be where i want to change rooms
            stage.removeChild(ROOMS[currentRow][currentCol]);
            currentCol++;
            Constants.wallsRef = ROOMS[currentRow][currentCol];
            stage.addChild(ROOMS[currentRow][currentCol]);
            player.x = 10;//change to 600
            moved = true;
            trace("changed rooms");
            stage.addChild(arrowCount);
            stage.addChild(arrowImage);
        }else if(Constants.playerRef.hitTestObject(Constants.blockerRef1) == false && moved == true){
            moved = false;
        }
    }

    function createRooms(){
        for(var r = 0; r <ROOMS.length; r++){
            walls = new Walls();
            addRandomBlocks();
            for(var c = 0; c < ROOMS[r].length; c++){
                walls = new Walls();
                addRandomBlocks();
                ROOMS[r][c] = walls;
            }



            trace(ROOMS[r][c]);
        }
    }
    //                    [room2, NaN],
    //                    [room6, room1, room5], /// THIS IS THE MAP OF THE FLOOR /// GOING UP ON THE GAME IS GOING DOWN ON IT
    //                    [room7, room8],
    //                    [room3, room9],
    //                    [room4]);
    function closeUnnecessaryExits(){
        trace("ROW: " + currentRow + "  COL: " + currentCol);

        var up = ROOMS[currentRow + 1];
        var down = ROOMS[currentRow - 1];
        var right = ROOMS[currentRow][currentCol + 1];
        var left = ROOMS[currentRow][currentCol - 1];
        //check to see which outside wasall to use
        if(ROOMS[currentRow + 1] == null && up && right && left){
            ROOMS[currentRow][currentCol].gotoAndStop(2);
        }else if(down == null && left == null && right && up){
            ROOMS[currentRow][currentCol].gotoAndStop(3);
        }else if(down == null && left == null && up == null && right){
            ROOMS[currentRow][currentCol].gotoAndStop(4);
        }else if(left == null && down && right && up){// IF HAVING PROBLEMS THEN MAKE THIS MAKE SURE ALL OTHER SIDES ARE TRUE
            ROOMS[currentRow][currentCol].gotoAndStop(5);
        }else if(down == null && left == null && right == null && up){
            ROOMS[currentRow][currentCol].gotoAndStop(6);
        }else if(down && up == null && right == null && left == null){
            ROOMS[currentRow][currentCol].gotoAndStop(7);
        }else if(ROOMS[currentRow + 1][currentCol] == null && ROOMS[currentRow - 1][currentCol] && left && right){
            ROOMS[currentRow][currentCol].gotoAndStop(8);
            trace("works 1");
        }else if(left && right && ROOMS[currentRow - 1][currentCol] == null && ROOMS[currentRow + 1][currentCol] == null){
            ROOMS[currentRow][currentCol].gotoAndStop(9);
            trace("works 2");
        }else if(left && ROOMS[currentRow - 1][currentCol] && right == null && ROOMS[currentRow + 1][currentCol] == null){
            ROOMS[currentRow][currentCol].gotoAndStop(10);// LEFT DOWN
            trace("works 3");
        }else if(left && ROOMS[currentRow + 1][currentCol] && ROOMS[currentRow - 1][currentCol] == null && right == null){
            ROOMS[currentRow][currentCol].gotoAndStop(11);//BROKEN left up
            trace("working 4");
        }else if(left && ROOMS[currentRow + 1][currentCol] == null && ROOMS[currentRow - 1][currentCol] == null && right == null){
            ROOMS[currentRow][currentCol].gotoAndStop(12);
            trace("works 5");
        }else if(right == null && left && up && down){
            ROOMS[currentRow][currentCol].gotoAndStop(13);
            trace("works 6");
        }
    }

    function addRandomBlocks(){
        for(var e=0; e <Math.random() * 10; e++){
            //trace("started block");
            box = new Box();
            box.x = Math.random() * (615 - 100) + 100;
            box.y = Math.random() * (500 - 120) + 120;
            //colision for block to block
            for(var col = 0; col < boxes.length; col++){
                if(box.hitTestObject(boxes[col])){
                    onTop = false;/// THIS NEEDS TO BE TRUE FOR THE DETECTION TO WORK
                    //trace("THIS BOX IS ON TOP OF ANOTHER");
                }
            }
            if(onTop == false){
                boxes.push(box);
                walls.addChild(box);
                trace("BOX CREATED " + onTop);
                //trace(boxes);
            }

        }
    }

}

}

Answer 1

您可以通过创建一些处理分配和访问二维数组中的值的简单函数来简化您的代码。检查二维数组中的元素是否存在的代码可能如下所示：

function cellExists(array:Array, x:int, y:int):Boolean {
    return array[y] !== undefined && array[y][x] !== undefined;
}

在您的示例中使用如下：

if (cellExists(ROOMS, currentCol, currentRow)) {
    //
}

虽然对于这种类型的任务，您可以从实施处理网格 + 单元格数据的 class 中获益匪浅，但可以按照以下思路开始：

public class Grid {
    private var _content:Vector.<Vector.<Cell>>;

    public function Grid(columns:int, rows:int) {
        // Fill _content with empty slots based on columns, rows.
    }

    public function getCell(x:int, y:int):Cell {}
    public function cellExists(x:int, y:int):Boolean {}
}

Actionscript 3 - 如何检查数组位置是否已经存在

Actionscript 3 - How to Check if an Array Position Already Exists

arrays

actionscript-3

flash

flash-cs6