flash与动画：图片移动实现新探索

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

//移动背景的类
public class MoveBg extends Sprite
{
  //背景宽度 
  public var bgWidth:int;

  //背景高度
  public var bgHeight:int;

        //源图像宽度
  private var sourceBmpWidth:int;

  //画布
  private var canvas:BitmapData;
  private var bitmapData:BitmapData;

  private var sourceRect:Rectangle;

  private var pt:Point=new Point();

  private var bitmap:Bitmap;

  private var offX:int;
  private var currentX:int;

  public function MoveBg(w:int,h:int)
  {
   this.bgWidth = w;
   this.bgHeight = h;
   sourceRect = new Rectangle(0,0,w,h);
   canvas = new BitmapData(w,h);
   bitmap = new Bitmap(canvas);
   addChild(bitmap);
  }
  public function start():void
  {
   if(!this.hasEventListener(Event.ENTER_FRAME))
   addEventListener(Event.ENTER_FRAME,onUpdate);
  }

  public function stop():void
  {
   if(this.hasEventListener(Event.ENTER_FRAME))
   removeEventListener(Event.ENTER_FRAME,onUpdate);
  }

  private function onUpdate(event:Event):void
  {
   move();
  }

  public function setSource(bitmapData:BitmapData,mouse_Enabled:Boolean=false):void
  {
   this.bitmapData = bitmapData;
   this.mouseEnabled = mouse_Enabled;
   this.sourceBmpWidth = bitmapData.width;
  }

  //移动背景
  public function move():void
  {
   currentX++;
   offX = currentX % sourceBmpWidth;//偏移的位置
   if (offX+bgWidth<=sourceBmpWidth)
   {
    sourceRect.x = offX;
    sourceRect.width = bgWidth;
   }
   else
   {
    sourceRect.x = offX;
    sourceRect.width = sourceBmpWidth - offX;

   }
   pt.x = 0;
   canvas.copyPixels(bitmapData, sourceRect, pt);
   if (offX >bgWidth)
   {
    pt.x = sourceBmpWidth - offX;
    canvas.copyPixels(bitmapData, canvas.rect, pt);

   }

  }

}

补充：综合编程 , 其他综合 ,

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