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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>My照片墻</title>
<style type="text/css">
*{
padding:0;
margin: 0;
}
li,ul{
list-style: none;
}
#parent{
margin: 0 auto;
width: 830px;
height: 600px;
margin-top:50px;
}
#parent li{
float: left;
height: 250px;
margin: 10px;
width: 250px;
}
</style>
<script type="text/javascript">
/**
*
*將浮動布局轉換為絕對定位布局
*/
window.onload=function(){
var parent = document.getElementById("parent");
var son = document.getElementsByTagName("li");
var start1=document.getElementById("start");
var lastindex=0;
var arr=[];
//存儲定位前的li的left,top值。
for(var i=0;i<son.length;i++){
arr.push([son[i].offsetLeft,son[i].offsetTop]);
son[i].index=i;
}
//轉換為定位，并賦值
for(var i=0;i<son.length;i++){
son[i].style.position="absolute";
son[i].style.left=arr[i][0]+"px";
son[i].style.top =arr[i][1]+"px";
son[i].style.margin=0;
}
for(var i=0;i<son.length;i++){
drag(son[i]);;
}
//返回一個X-Y之間的隨機數
function stochastic(x,y){
//四舍五入和0-1之間的隨機數
return Math.round(Math.random()*(y-x)+x);
}
//-----待改進,隨機移動有問題，------
start1.onclick=function(){
var arr1 =[0,1,2,3,4,5,6,7,8];
var temp=0;
var newarr=arr1.sort(function(a,b){
return Math.random()-0.5;
});
//alert(newarr); 2,0,3,4,7,8,5,6,1
//console.log(kleft+":"+ktop);
var kleft=0;
var ktop=0;
for(var i=0;i<son.length;i++){
kleft=arr[newarr[i]][0];
ktop=arr[newarr[i]][1];
console.log(kleft+":"+ktop);
startMove(son[i],{'left':kleft,'top':ktop});
son[i].index=newarr[i];
}
}
//改進版------移動函數
function startMove ( obj,json, endFn ){
clearInterval( obj.timer );
var a= false;
var b=false;
obj.timer = setInterval(function () {
var dir=13;
for(var attr in json){
var target=json[attr];
dir = parseInt(getStyle( obj, attr )) < target ? dir : -dir;
var speed = parseInt(getStyle( obj, attr )) + dir; // 步長
if ( speed > target && dir > 0 || speed < target && dir < 0 ) {
speed = target;
}
obj.style[attr] = speed + 'px';
if ( speed == target&&attr=='left') {
a=true;
}else if(speed == target&&attr=='top'){
b=true;
}
if(a&&b){
clearInterval(obj.timer);
endFn&&endFn();
}
}
}, 30);
}
//拖拽函數
function drag(obj){
var disX=0;
var disY=0;
++lastindex;
obj. = function(ev){
obj.style.zIndex=lastindex;
var ev = ev||window.event;
disX = ev.clientX - obj.offsetLeft;
disY = ev.clientY - obj.offsetTop;
document. = function(ev){
var ev = ev||window.event;
obj.style.left=ev.clientX - disX + "px";
obj.style.top =ev.clientY - disY + "px";
/*碰撞測試
for(var i =0;i<son.length;i++){
if(impectCheck(obj,son[i])&&obj!=son[i]){
son[i].style.border="3px solid red";
}else{
son[i].style.border="";
}
}
*/
//清楚所有樣式
for(var i =0;i<son.length;i++){
son[i].style.border="";
}
var oLi= nearLi(obj);
/*
*這里的值有問題!
*/
oLi.style.border="3px solid red";
};
document. = function(){
document.onmousemove=null;
document.onmouseup=null;
//交換位置
//最近的li
var oLi= nearLi(obj);
var temp=0;
//拖拽的值
var nowleft =arr[obj.index][0];
var nowtop = arr[obj.index][1];
if(oLi){
//被碰撞的值
var newleft =arr[oLi.index][0];
var newtop = arr[oLi.index][1]
//console.log(arr[obj.index][1])
//console.log(arr[oLi.index][1])
//alert(arr[oLi.index][0]);
//console.log(oLi)
doMove( oLi, 'left', 50, nowleft,function(){
//console.log(oLi)
doMove( oLi, 'top', 50,nowtop ,function(){
//console.log(oLi)
});
});
doMove( obj, 'left', 50, newleft,function(){
doMove( obj, 'top', 50, newtop,function(){
});
});
//console.log(oLi.index);
//console.log(obj.index);
//清楚樣式
oLi.style.border="";
//交換索引
temp=oLi.index;
oLi.index=obj.index;
obj.index=temp;
//console.log(obj.index);
}else{
doMove( obj, 'left', 50, nowleft,function(){
doMove( obj, 'top', 50, nowtop);
});
}
};
return false;
};
}
//找出最近的li
function nearLi(obj){
var min=9999;
var index=-1;
for(var i=0;i<son.length;i++){
if(impectCheck(obj,son[i])&&obj!=son[i]){
var c =range(obj,son[i]);
if(c<min){
min=c;
index=i;
}
}
}
//判斷是否碰撞了。
var arr = index!=-1?son[index]:false;
return arr ;
}
}
//獲取樣式的值
function getStyle ( obj, attr ) { return obj.currentStyle?obj.currentStyle[attr] : getComputedStyle( obj )[attr]; }
//勾股定理找出斜邊---->最近的li
function range(obj1,obj2){
var a=obj1.offsetLeft-obj2.offsetLeft;
var b=obj1.offsetTop-obj2.offsetTop;
return Math.sqrt(a*a+b*b);
}
//碰撞檢測函數
function impectCheck(obj1,obj2){
var L1 = obj1.offsetLeft;
var R1 = obj1.offsetLeft+obj1.offsetWidth;
var T1 = obj1.offsetTop;
var B1 = obj1.offsetTop+obj1.offsetHeight;
var L2 = obj2.offsetLeft;
var R2 = obj2.offsetLeft+obj2.offsetWidth;
var T2 = obj2.offsetTop;
var B2 = obj2.offsetTop+obj2.offsetHeight;
if(L2>R1||L1>R2||T2>B1||T1>B2){
return false;
}else{
return true;
}
}
//移動函數
function doMove ( obj, attr, dir, target, endFn ) {
var target=target;
dir = parseInt(getStyle( obj, attr )) < target ? dir : -dir;
clearInterval( obj.timer );
obj.timer = setInterval(function () {
var speed = parseInt(getStyle( obj, attr )) + dir; // 步長
if ( speed > target && dir > 0 || speed < target && dir < 0 ) {
speed = target;
}
obj.style[attr] = speed + 'px';
if ( speed == target) {
clearInterval( obj.timer );
/*
if ( endFn ) {
endFn();
}
*/
endFn && endFn();
}
}, 30);
}
</script>
</head>
<body>
<div id="start" >
<b>打亂順序</b>
</div>
<ul id="parent">
<li><img src="p_w_picpaths/PX_5.jpg"/></li>
<li><img src="p_w_picpaths/PX_6.jpg"/></li>
<li><img src="p_w_picpaths/PX_7.jpg"/></li>
<li><img src="p_w_picpaths/PX_8.jpg"/></li>
<li><img src="p_w_picpaths/PX_9.jpg"/></li>
<li><img src="p_w_picpaths/PX_10.jpg"/></li>
<li><img src="p_w_picpaths/PX_11.jpg"/></li>
<li><img src="p_w_picpaths/PX_12.jpg"/></li>
<li><img src="p_w_picpaths/PX_13.jpg"/></li>
</ul>
</body>
</html>
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