图片展览滚动效果[原创]

转载请注明作者,谢谢!

制作思路:
         (1):构建好XML文件,进行载入判断,取得xml节点
         (2):在一个大的影片剪辑内,进行复制要加载图片的影片剪辑,按X轴方向水平排列
         (3):使用[被遮照的影片剪辑.setMask(遮照的影片剪辑)] 创建遮照效果
         (4):滚动区域的判断

stop();
System.useCodepage = true;
var link_xml:XML = new XML();
link_xml.ignoreWhite = true;
link_xml.onLoad = function(success) {
if (success) {
//trace(this);
nextFrame();
} else {
trace("Error loading XML");
}
};
link_xml.load("content_xml.as");

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/**
* Description 版权所有2007@lbynet http://www.www.52hai.com/User0/140
* @author _lby
* @version 0.1
* @discription:图片展览滚动效果;
*/
stop();
var _this = _root.link_xml.firstChild;
var len:Number = _this.childNodes.length;
//trace(len);
var img_path_arr:Array = [];
var link_arr:Array = [];
Loader_fun = function () {
for (var i:Number = 0; i<len; i++) {
img_path_arr[i] = _this.childNodes[i].childNodes[0].childNodes[0].nodeValue;
link_arr[i] = _this.childNodes[i].childNodes[1].childNodes[0].nodeValue;
//进行copy影片剪辑排列
content_mc.image_mc.duplicateMovieClip("image_mc"+i, 100+i);
content_mc.image_mc._visible = false;
content_mc["image_mc"+i]._x = content_mc.image_mc._width*i;
content_mc["image_mc"+i]._y = 0;
//加载图片;
var mc:MovieClip = content_mc["image_mc"+i];
mc.i = i;
mc._alpha = 60;
mc.onRollOver = function() {
this._alpha = 100;
trace(this.i);
};
mc.onRollOut = function() {
this._alpha = 60;
};
mc.onRelease = function() {
getURL(link_arr[this.i]);
};
var loadListener:Object = new Object();
//参数mc为当前被加载进来的,这里为content_mc["image_mc"+i].load_mc
loadListener.onLoadComplete = function(mc:MovieClip) {
mc._parent.preloader._visible = false;
};
loadListener.onLoadError = function(mc:MovieClip) {
mc._parent.preloader._visible = true;
trace("加载图片失败");
};
if (img_path_arr != null && img_path_arr != "" && img_path_arr != undefined) {
var imgLoader:MovieClipLoader = new MovieClipLoader();
imgLoader.addListener(loadListener);
imgLoader.loadClip(img_path_arr[i], content_mc["image_mc"+i].load_mc);
}
}
};
Loader_fun();
content_mc.setMask(mask_mc);
/*
//自定义滚动类
import DragRegion;
new DragRegion(content_mc,mask_mc);
*/
/* 滚动判断 */
content_mc.onEnterFrame = function() {
this._x = -((this._width-mask_mc._width)/mask_mc._width)*mask_mc._xmouse;
//trace(this._x);
if (this._x<-(100*len-500)) {
//超出的为100*len-500
this._x = -(100*len-500);
} else if (this._x>-50) {
this._x = 0;
}
};

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补充下面部分,如有错,请指正:

认真分析下面图解也不难理解

this._x = -((this._width-mask_mc._width)/mask_mc._width)*mask_mc._xmouse;

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因为content_mc 与 mask_mc 的高度一样,所以只要根据上面表达式求得 content_mc的x坐标与 mask_mc._xmouse之间的关系
content_mc 与 mask_mc 的宽度之差 ,得到多出来的部分宽度,如上图所示的R1
再除于 mask_mc 的宽度,得到一个比例,这个比例是多出部分占mask_mc的百分比,
这个比较等价于 mask_mc._xmouse(将作为鼠标在 mask_mc上移动的偏移距离量) 与 content_mc._x 的比例

所以得到