好长时间没发东西了,放假了,什么事都不想做,懒惰呀!不好

大多数情况下加载的图片要不就是按统一尺寸修改为同样的长与宽,要不就不管外部图片大小导入后都统一缩放到同一长和宽;但有些时候可能需要保持原始图片的长宽比例进行显示,今天没事做了个简单的实例,因此没有加特效.只适合我等初学者.

代码如下：

stop();
//创建一个新的电影实例,用于侦听事件内的载体
var mc:MovieClip = this.createEmptyMovieClip("mc", this.getNextHighestDepth());
//初始图片数
var i:Number = 1;
//图片的宽度与高度设置
var picWidth:Number = Stage.width-10;
var picHeigh:Number = Stage.height-10;
//存贮从导入的外部图片宽度与高度的数组
var outImgWidth:Array = new Array();
var outImgHeight:Array = new Array();
//创建一个侦听事件和对象,用于检查和导入外部图片的数据
var myMCL0:MovieClipLoader = new MovieClipLoader();
var myObject0:Object = new Object();
myObject0.onLoadError = function(target_mc:MovieClip) {  //检查外部总图片数没有了时,导入并显示第一张图片
        myMCL0.removeListener(myObject0);
        i = 1;
        myMCL.loadClip("imgs/1.jpg", mc);
};
myObject0.onLoadInit = function(target_mc:MovieClip) {  // .............以下是关键语句部分............
        //从外部导入的图片宽度与高度分别存贮到对应的数组中
        outImgWidth.push(target_mc._width);
        outImgHeight.push(target_mc._height);
        //设定一个图片数从0开始计数,用于数组定位
        var j:Number = Number(i-1);
        //设定两个临时变量,存贮导入的图片原本的宽度与高度
        var tempWidth:Number = outImgWidth[j];
        var tempHeight:Number = outImgHeight[j];
        var W_H:Number = Math.floor(tempHeight*picWidth/tempWidth);
        var H_W:Number = Math.floor(tempWidth*picHeigh/tempHeight);
        //如果导入的图片的原本宽度大于高度,同时宽度大于picWidth时
        if (tempWidth>tempHeight && tempWidth>picWidth) {
                //宽度大于高度时
                //首先删除数组中最后一元素
                outImgWidth.pop();
                outImgHeight.pop();
                //如果折算后的高度和宽度都小于显示高度时
                if (W_H<picHeigh && W_H<picWidth) {
                        //再为数组增加一个元素,目的是修改数组使宽度和高度都符合显示要求
                        outImgWidth.push(picWidth);
                        outImgHeight.push(W_H);
                        //如果折算后的高度大于或等于显示高度时
                } else {
                        //再为数组增加一个元素,目的是修改数组使宽度和高度都符合显示要求
                        outImgWidth.push(H_W);
                        outImgHeight.push(picHeigh);
                }
        }
        //如果导入的图片原本的高度大于宽度,同时高度大于picHeigh时                                                                                                                                                          
        if (tempHeight>tempWidth && tempHeight>picHeigh) {
                //宽度小于高度时
                //首先删除数组中最后一元素
                outImgWidth.pop();
                outImgHeight.pop();
                //再为数组增加一个元素,目的是修改数组使宽度和高度都符合显示要求
                outImgWidth.push(H_W);
                outImgHeight.push(picHeigh);
        }
        //如果导入的图片原本的宽度等于高度,而且是等于或超过舞台上的那个像框尺寸时                                                                                                                                                          
        if (tempWidth == tempHeight && tempWidth>=picWidth) {
                //宽度等于高度时
                //首先删除数组中最后一元素
                outImgWidth.pop();
                outImgHeight.pop();
                //再为数组增加一个元素,目的是修改数组使宽度和高度都符合显示要求
                outImgWidth.push(picHeigh);
                outImgHeight.push(picHeigh);
        }
        i  ;
        myMCL0.loadClip("imgs/" i ".jpg", mc);  
};
myMCL0.loadClip("imgs/" i ".jpg", mc);   //导入外部图片
myMCL0.addListener(myObject0);
//
var myMCL:MovieClipLoader = new MovieClipLoader();
var myObject:Object = new Object();
myObject.onLoadInit = function(target:MovieClip) {  //初始化图片尺寸和居中
        var j:Number = Number(i-1);
        target._width = outImgWidth[j];
        target._height = outImgHeight[j];
        target._x = Stage.width/2-target._width/2;
        target._y = Stage.height/2-target._height/2;
};
myMCL.addListener(myObject);
var keyListener_obj:Object = new Object();  //侦听是否按左右方向键,更换图片
keyListener_obj.onKeyDown = function() {
        switch (Key.getCode()) {
        case Key.RIGHT :
                i  ;
                if (i>=outImgWidth.length) {
                        i = outImgWidth.length;
                }
                myMCL.loadClip("imgs/" i ".jpg", mc);
                break;
        case Key.LEFT :
                i--;
                if (i<=1) {
                        i = 1;
                }
                myMCL.loadClip("imgs/" i ".jpg", mc);
        }
};
Key.addListener(keyListener_obj);