AS3图像复制BitmapData.copyPixels()

//舞台属性设置

stage.align=StageAlign.TOP_LEFT;

stage.scaleMode=StageScaleMode.NO_SCALE;

var selectBox:Sprite = new Sprite(); //生成选择框

var recordX:Number; //记录初始x坐标

var recordY:Number; //记录初始y坐标

var endX:Number; //记录结束x坐标

var endY:Number; //记录结束y坐标

var moveX:Number; //记录移动之后x坐标

var moveY:Number; //记录移动之后y坐标

var myImage:Bitmap; //显示图片的容器

var dragFlag:Boolean= false ; //用于判断选择框是否正在拖动

var clickPoint:Point; //记录开始的选择框对应的舞台坐标点

var endPoint:Point; //记录选择框绘制结束后选择框对应的舞台坐标点

initStage();

function initStage() {

     myImage= new Bitmap();

     addChild(myImage);

     bg.addEventListener(MouseEvent.MOUSE_DOWN,startDraw); //绘制选择框

     selectBox.addEventListener(MouseEvent.MOUSE_DOWN,dragSelectBox); //拖动选择框

     selectBox.addEventListener(MouseEvent.MOUSE_UP,stopDragSelectBox); //停止拖动选择框

}

function dragSelectBox(_evt:MouseEvent): void {

     _evt.currentTarget.startDrag();

     dragFlag= true ;

}

function stopDragSelectBox(_evt:MouseEvent) {

     if (dragFlag== true ) {

         createJPG(mc_image,selectBox,Math.min(selectBox.localToGlobal(clickPoint).x,selectBox.localToGlobal(endPoint).x),Math.min(selectBox.localToGlobal(clickPoint).y,selectBox.localToGlobal(endPoint).y));

         selectBox.stopDrag();

         dragFlag = false ;

     }

}

//开始绘制

function startDraw(_evt:MouseEvent): void {

     stage.addEventListener(Event.ENTER_FRAME,drawSelectBox);

     recordX = mouseX;

     recordY = mouseY;

     clickPoint = new Point(recordX,recordY);

}

//绘制选择框

function drawSelectBox(_evt:Event): void {

     selectBox.x=selectBox.y=0; //恢复坐标到原点

     selectBox.graphics.clear();

     selectBox.graphics.lineStyle(1,0x000000);

     selectBox.graphics.beginFill(0xffffff,0.7);

     selectBox.graphics.drawRect(recordX,recordY,mouseX-recordX,mouseY-recordY);

     selectBox.graphics.endFill();

     addChild(selectBox);

     stage.addEventListener(MouseEvent.MOUSE_UP,endDraw); // 鼠标在舞台上放开时的事件

}

//绘制结束

function endDraw(_evt:MouseEvent): void {

     stage.removeEventListener(Event.ENTER_FRAME,drawSelectBox);

     selectBox.stopDrag();

     dragFlag = false ;

     endX = mouseX;

     endY = mouseY;

     endPoint = new Point(endX,endY);

     createJPG(mc_image,selectBox,Math.min(recordX,endX),Math.min(recordY,endY));

     stage.removeEventListener(MouseEvent.MOUSE_UP,endDraw); //鼠标在舞台上放开时的事件

}

function createJPG(m:MovieClip,box:Sprite,originX:Number,originY:Number) {

     removeChild(myImage);

     var jpgSource:BitmapData= new BitmapData (m.width, m.height); //先把背景图转换成BitmapData

     jpgSource.draw(m);

     var rect:Rectangle = new Rectangle(originX,originY,box.width,box.height); //设置复制的区域和大小

     var pt:Point = new Point(0, 0); //复制到的对象的起始点

     var jpgOut:BitmapData= new BitmapData(box.width, box.height);

     jpgOut.copyPixels(jpgSource, rect, pt); //复制区域内容

     myImage = new Bitmap(jpgOut);

     addChild(myImage);

在Flash上点击左键拖动可以复制选中的图片内容到左上角，这个东西的具体用处，大概就是图片信息复制吧。