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。