Question

所以我正在尝试加载精灵表。我已将它嵌入到.swf中，但是当我实例化一个类并调用一个从sprite表开始剪切的函数时，我收到错误：

“参数sourceBitmapData必须为非null。”

我知道发生的事情是在实际加载精灵表图像之前调用代码，但我不知道如何解决这个问题，因为我嵌入而不是使用加载器。我假设我需要使用事件监听器，但是如何使用嵌入工作呢？到目前为止，这是我的代码：

在主公共课程中：

private var currentSprite:SpriteSheet;
[Embed(source='../assets/images/sprite_sheet_1.png')]
private var sheetClass:Class;
private var sheet:Bitmap = new sheetClass();

然后在Main函数中：

currentSprite = new SpriteSheet( sheet, 25, 25 );
addChild(currentSprite);

SpriteSheet函数设置如下：

public function SpriteSheet(tileSheetBitmap:Bitmap, width:Number = 25, height:Number = 25) {
    tileSheetBitmapData = tileSheetBitmap.bitmapData;
    tileWidth = width;
    tileHeight = height;

    rowLength = int(tileSheetBitmap.width / width );

    tileRectangle = new Rectangle( 0, 0, tileWidth, tileHeight );
    tilePoint = new Point( 0, 0 );

    canvasBitmapData = new BitmapData( tileWidth, tileHeight, true );
    var canvasBitmap:Bitmap = new Bitmap(canvasBitmapData);
    addChild(canvasBitmap);

    drawTile(0);

    addEventListener(Event.REMOVED_FROM_STAGE, remove);
}

在我的SpriteSheet类中，我调用了一个调用copyPixels（）的drawTile函数，其中错误来自：

canvasBitmapData.copyPixels(tileSheetBitmapData, tileRectangle, tilePoint);

我知道这是很多代码，但我觉得这可能是一个简单的解决方案。任何反馈将不胜感激。谢谢！

编辑：这是SpriteSheet类：

package
{
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.geom.Point;
    import flash.geom.Rectangle;
    import flash.events.Event;

    public class SpriteSheet extends Sprite {
        public var tileSheetBitmapData:BitmapData;
        private var canvasBitmapData:BitmapData;

        private var tileWidth:int;
        private var tileHeight:int;
        private var rowLength:int;

        private var tileRectangle:Rectangle;
        private var tilePoint:Point;

        public function SpriteSheet(tileSheetBitmap:Bitmap, width:Number = 25, height:Number = 25) {
            tileSheetBitmapData = tileSheetBitmap.bitmapData;
            if(tileSheetBitmap != null ) {
                trace("tileSheetBitmap is not null in SpriteSheet");
            }
            if( tileSheetBitmapData != null ){
                trace("tileSheetBitmapData is not null in SpriteSheet");
            }
            tileWidth = width;
            tileHeight = height;

            rowLength = int(tileSheetBitmap.width / width );

            tileRectangle = new Rectangle( 0, 0, tileWidth, tileHeight );
            tilePoint = new Point( 0, 0 );

            canvasBitmapData = new BitmapData( tileWidth, tileHeight, true );
            var canvasBitmap:Bitmap = new Bitmap(canvasBitmapData);
            addChild(canvasBitmap);

            drawTile(0);

            addEventListener(Event.REMOVED_FROM_STAGE, remove);
        } //end of SpriteSheet

        public function drawTile(tileNumber:int):BitmapData {
            trace("Reached drawTile");
            tileRectangle.x = int( (tileNumber % rowLength) ) * tileWidth;
            tileRectangle.y = int( (tileNumber / rowLength) ) * tileHeight;
            canvasBitmapData.copyPixels(tileSheetBitmapData, tileRectangle, tilePoint);
            trace("Reached past copyPixels");

            return canvasBitmapData.clone();
        } //end of drawTile

        public function tileBoard(boardIndex:Array):BitmapData {
            var wide:int = boardIndex[0].length;
            var tall:int = boardIndex.length;

            canvasBitmapData = new BitmapData( (tileWidth * wide), (tileHeight * tall), true);
            var boardCanvas:Bitmap = Bitmap(getChildAt(0));
            boardCanvas.bitmapData = canvasBitmapData;

            tileRectangle = new Rectangle( 0, 0, (tileWidth * wide), (tileHeight * tall) );
            for( var i:int = 0; i < wide; i++ ) {
                for( var j:int = 0; j < tall; j++ ) {
                    tilePoint = new Point((tileWidth * i), (tileHeight * j) );

                    drawTile(boardIndex[j][i]);
                }
            }
            return canvasBitmapData.clone();
        } //end tileBoard

        public function remove(e:Event):void {
            tileSheetBitmapData.dispose();
            canvasBitmapData.dispose();
        } //end remove
    } //end class SpriteSheet
} //end package

Answer 1

这不是一个加载问题，因为您将png文件嵌入到swf中，所有图像加载都是在加载swf时完成的。

这只是Flash IDE编译器的问题...使用Flex编译器时，这不是必需的......

尝试：

private var sheet:BitmapData = new sheetClass(0,0);

将您的SpriteSheet类更改为直接接受bitmapData

等待嵌入式映像加载？

1 个答案: