Question

我正在开发Flash中的拼图游戏。我正在为拼图开发一个类。 PuzzlePiece类的代码如下。

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

public class PuzzlePiece extends MovieClip
{

    private var pieceX:Number;
    private var pieceY:Number;

    private var pieceXRandom:Number;
    private var pieceYRandom:Number;


    public function PuzzlePiece(pieceXRandom:Number,pieceYRandom:Number)
    {
        this.pieceXRandom = pieceXRandom;
        this.pieceYRandom = pieceYRandom;
        this.addEventListener(MouseEvent.MOUSE_DOWN,Drag);

        positionClips();
        this.gotoAndStop(2);

        this.holder_mc.width = this.holder_mc.height = 60;
        this.mask1_mc.width = this.mask2_mc.width = 60;
        this.mask1_mc.height = this.mask2_mc.height = 60;

    }

    private function positionClips():void
    {
        this.x = pieceXRandom;
        this.y = pieceYRandom;
    }

    private function Drag(e:MouseEvent)
    {
        switch (e.type)
        {
            case 'mouseDown' :
                this.startDrag();
                this.addEventListener(MouseEvent.MOUSE_UP,Drag);
                break;

            case 'mouseUp' :
                this.stopDrag();
                this.removeEventListener(MouseEvent.MOUSE_UP,Drag);
                /*var m:*=this.parent;
                m.pos(this.x,this.y);*/

        }

    }
}
}

这是主时间轴中的代码。

//Global variables//
var imageDimension:Number = 360;
var gridType:Number = 6;
var puzzlePieceShape:String = "Sqaure";
var imageLoader:Loader = new Loader();
var bitmapArray:Array = [];
var puzzlePiece:PuzzlePiece;

var bitmapManip:BitmapManipulation;

loadImage();

function loadImage()
{
    imageLoader.load(new URLRequest("Mohanlal.jpg"));//The image being loaded is of 360*360
    imageHolder_mc.addChild(imageLoader);//imageHolder_mc is an empty MovieClip on stage
    imageHolder_mc.visible = false;
    imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, layoutPieces);
}

function layoutPieces(evt:Event)
{
    bitmapManip = new BitmapManipulation(imageDimension,gridType);
    bitmapArray = bitmapManip.getBitmapImagePieces(imageHolder_mc);

    for (var j:uint =0; j<bitmapArray.length; j++)
    {

        for (var k:uint=0; k<bitmapArray[j].length; k++)
        {

            var bitmap:Bitmap = new Bitmap(bitmapArray[j][k]);
            puzzlePiece = new PuzzlePiece(400 * Math.random(),400 * Math.random());
            addChild(puzzlePiece);
            puzzlePiece.holder_mc.addChild(bitmap);

        }
    }
}

位图操作类

package 
{
    import flash.display.MovieClip;
    import flash.display.BitmapData;
    import flash.geom.Point;
    import flash.geom.Rectangle;

    public class BitmapManipulation extends MovieClip
        {
            private var imageDimension:Number;
            private var gridDimension:Number;

            public function BitmapManipulation(imageDimension:Number,gridDimension:Number)
            {
                this.imageDimension = imageDimension;
                this.gridDimension = gridDimension;

            }

            public function getBitmapImagePieces(imageMC:MovieClip):Array
            {
                var bitmapArray:Array = [];
                var imageBitmapData:BitmapData = new BitmapData(imageMC.width,imageMC.height);
                imageBitmapData.draw(imageMC);
                var tileDimesion:Number = this.imageDimension / this.gridDimension;

                for (var i:uint = 0; i<this.gridDimension; i++)
                {
                    bitmapArray[i] = new Array();

                    for (var j:uint = 0; j<this.gridDimension; j++)
                    {

                        var tempData:BitmapData = new BitmapData(tileDimesion,tileDimesion);
                        var tempRect:Rectangle = new Rectangle(((tileDimesion) * i),((tileDimesion) * j),tileDimesion,tileDimesion);
                        tempData.copyPixels(imageBitmapData,tempRect,new Point(0,0));
                        bitmapArray[i][j] = tempData;

                    }
                }

                return(bitmapArray);

            }
        }
    }

拼图动画片夹有两层

Mask Layer - Two masks. One rectangular and one triangular in frame 1 and 2.
Holder Layer - holder_mc

我正在尝试使用PuzzlePiece类中的代码在魔片中设置动画片段的尺寸。

但是我收到了这个错误。

TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at PuzzlePiece()[C:\Users\Shabeeb\Desktop\Puzzle OOP\PuzzlePiece.as:26]
    at PuzzlePiece_fla::MainTimeline/layoutPieces()[PuzzlePiece_fla.MainTimeline::frame1:33]

Line number 33 in main timeline class calls 

this.holder_mc.width = this.holder_mc.height = 60;
this.mask1_mc.width = this.mask2_mc.width = 60;
this.mask1_mc.height = this.mask2_mc.height = 60;

这样访问它是不对的。 PuzzlePiece是拼图剪辑的导出。

暂时我很难将维度编码为60.我已经aloso上传了fla和文件。

https://rapidshare.com/files/4248268633/Puzzle_OOP.zip

Answer 1

这可能会让您了解http://www.developria.com/2010/04/combining-the-timeline-with-oo.html发生的事情。（简而言之，在Flash播放器实际创建它们之前，您无法访问在时间轴上声明的对象。）

请注意，我不建议您使用框架脚本执行比stop（）更复杂的操作，特别是如果您还要使用文档类。

Answer 2

感谢Kodiak提出的这个问题，你引导我找到答案。我克服了这个问题。我在PuzzlePiece中添加了以下内容。我看到mask2_mc在第2帧之前不存在。

this.gotoAndStop(1);
this.holder_mc.width = this.holder_mc.height = 60;
this.mask1_mc.width = 60;
this.mask1_mc.height = 60;
this.gotoAndStop(2);
this.mask2_mc.width = 60;
this.mask2_mc.height = 60

但我现在有一个新问题。

我需要在第1帧上选择遮罩。我在PuzzlePiece

中写了这样的函数

public function selectFrame(frameNo:uint) {
this.gotoAndStop(frameNo);
}

我通过在addChild

之后添加一行来调用fla中的函数

puzzlePiece.selectFrame(1);

当我测试时，我没有收到错误，但是我没有看到加载为位图的图像和puzzlePieces闪烁可能是由于反复从1跳到2。

如何在第1帧上选择遮罩。

注意： - 在实际情况下，我可以在时间轴中有任意数量的面具，我应该可以从fla中选择它。

TypeError：Actionscript 3中的错误＃1009

2 个答案: