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photo-wall.html
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photo-wall.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>照片墙</title>
<style type="text/css">
#list {
margin: 50px auto 0;
padding: 0;
width: 840px;
}
li {
list-style: none;
margin: 0 10px 10px 0;
width: 200px;
height: 300px;
float: left;
}
#list img {
width: 200px;
height: 300px;
}
</style>
</head>
<script src="js/move.js"></script>
<script type="text/javascript">
window.onload = function () {
var oUl = document.getElementById("list");
var aLi = oUl.getElementsByTagName("li");
var oBtn = document.getElementById('btn');
var originPositionArr = [];
var iLen = aLi.length;
var zIndex = 1;
for (var i = 0; i < iLen; i++) {
originPositionArr.push({
left: aLi[i].offsetLeft,
top: aLi[i].offsetTop
});
}
for (var i = 0; i < iLen; i++) {
aLi[i].index = i;
aLi[i].style.left = originPositionArr[i].left + "px";
aLi[i].style.top = originPositionArr[i].top + "px";
aLi[i].style.position = "absolute";
drag(aLi[i]);
}
//在css中有些样式的权限级别比较高，当我们通过js去设置一些css样式属性，在一个作用域内（js代码块域），有的样式设置会被js预先解析
/*for(var i=0;i<aLi.length;i++){
aLi[i].style.left=aLi[i].offsetLeft+"px";
aLi[i].style.top=aLi[i].offsetTop+"px";
drag(aLi[i]);
}
for(var i=0;i<aLi.length;i++){
aLi[i].style.position="absolute";
}*/
//随机
oBtn.onclick = function () {
var arr = [];
for (var i = 0; i < iLen; i++) {
arr.push(i);
}
arr.sort(function () {
return Math.random() - 0.5;
})
console.log(arr);
for (var i = 0; i < iLen; i++) {
var posIndex = arr[i];
aLi[i].index = posIndex;
move(aLi[i], {
left: originPositionArr[posIndex].left,
top: originPositionArr[posIndex].top
}, 1000, 'backOut');
}
}
//拖拽
function drag(obj) {
var disX = 0;
var disY = 0;
var o = null;
obj.onmousedown = function (ev) {
var e = ev || event;
obj.style.zIndex = zIndex++;
disX = e.clientX - obj.offsetLeft;
disY = e.clientY - obj.offsetTop;
document.onmousemove = function (ev) {
var e = ev || event;
obj.style.left = e.clientX - disX + 'px';
obj.style.top = e.clientY - disY + 'px';
//因为在碰撞的时候，也许会碰上多个元素，所以我们需要在for循环以后，才能去判断哪个被碰撞上的元素才是我们想要的，所有在这里，我们用一个数组去存碰上的元素
var pzArr = [];
//碰撞检测
for (var i = 0; i < iLen; i++) {
//检测碰撞的时候，排除自己（当前拖拽的元素）
if (obj != aLi[i]) {
pz(obj, aLi[i]) && pzArr.push(aLi[i]);
}
}
//console.log(pzArr);
//如果有多个被碰撞的元素，那么就要确定一下哪个元素才是我们想要的
//把当前拖拽的元素和碰碰撞上的元素做一个中间点直线距离检测，距离最短，才是我们要的元素
o = getShortObj(obj, pzArr);
for (var i = 0; i < iLen; i++) {
aLi[i].style.border = '0px solid red';
}
if (o) {
o.style.border = '1px solid red';
}
}
document.onmouseup = function () {
document.onmousemove = document.onmouseup = null;
if (!o) {
//alert(obj.index);
move(obj, {
left: originPositionArr[obj.index].left,
top: originPositionArr[obj.index].top
}, 1000, 'backOut');
} else {
o.style.border = '';
var p1 = originPositionArr[obj.index];
var p2 = originPositionArr[o.index];
move(obj, {
left: p2.left,
top: p2.top
}, 1000, 'backOut');
move(o, {
left: p1.left,
top: p1.top
}, 1000, 'backOut');
//交换元素的index
var _index = obj.index;
obj.index = o.index;
o.index = _index;
}
}
return false;
}
}
//碰撞检测
function pz(obj1, obj2) {
var L1 = obj1.offsetLeft;
var T1 = obj1.offsetTop;
var R1 = L1 + obj1.offsetWidth;
var B1 = T1 + obj1.offsetHeight;
var L2 = obj2.offsetLeft;
var T2 = obj2.offsetTop;
var R2 = L2 + obj2.offsetWidth;
var B2 = T2 + obj2.offsetHeight;
/*if (R1 < L2 || B1 < T2 || L1 > R2 || T1 > B2) {
return false;
} else {
return true;
}*/
return !(R1 < L2 || B1 < T2 || L1 > R2 || T1 > B2);
}
//计算一个元素和多个元素中直线距离最短的是谁
function getShortObj(obj, arr) {
var o = null;
var pos = 100000;
for (var i = 0; i < arr.length; i++) {
var a = (obj.offsetTop + obj.offsetHeight / 2) - (arr[i].offsetTop + arr[i].offsetHeight / 2);
var b = (obj.offsetLeft + obj.offsetWidth / 2) - (arr[i].offsetLeft + arr[i].offsetWidth / 2);
c = Math.sqrt(a * a + b * b);
if (c < pos) {
pos = c;
o = arr[i];
}
}
return o;
}
}
</script>
<body>
<input type="button" value="随机" id="btn"/>
<ul id="list">
<li><img src="img/photo-wall-img/1.jpg"/></li>
<li><img src="img/photo-wall-img/2.jpg"/></li>
<li><img src="img/photo-wall-img/3.jpg"/></li>
<li><img src="img/photo-wall-img/4.jpg"/></li>
<li><img src="img/photo-wall-img/5.jpg"/></li>
<li><img src="img/photo-wall-img/6.jpg"/></li>
<li><img src="img/photo-wall-img/7.jpg"/></li>
<li><img src="img/photo-wall-img/4.jpg"/></li>
<li><img src="img/photo-wall-img/5.jpg"/></li>
<li><img src="img/photo-wall-img/6.jpg"/></li>
<li><img src="img/photo-wall-img/1.jpg"/></li>
<li><img src="img/photo-wall-img/3.jpg"/></li>
</ul>
</body>
</html>