原生javascript实现DIV拖拽并计算重复面积

时间：2021-05-25

复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://putedStyle(element, null);
};
window.objPos = function(elem){
var left = 0, top = 0, right = 0, bottom = 0,doc = elem ? elem.ownerDocument : document;
if ( !elem.getBoundingClientRect || window.Sys.ie8 ) {
var n = elem;
while (n) { left += n.offsetLeft, top += n.offsetTop; n = n.offsetParent; };
right = left + elem.offsetWidth; bottom = top + elem.offsetHeight;
} else {
var rect = elem.getBoundingClientRect();
left = right = doc.documentElement.scrollLeft || doc.body.scrollLeft;
top = bottom = doc.documentElement.scrollLeft || doc.body.scrollLeft;
left += rect.left; right += rect.right;
top += rect.top; bottom += rect.bottom;
}
return { "left": left, "top": top, "right": right, "bottom": bottom };
};
window.hasClass = function(element, className){
return element.className.match(new RegExp('(\\s|^)'+className+'(\\s|$)'));
};
window.addClass = function(element, className){
!window.hasClass(element, className)&&(element.className += " "+className);
};
window.removeClass = function(element, className){
window.hasClass(element, className)&&(element.className = element.className.replace(new RegExp('(\\s|^)'+className+'(\\s|$)'),' '));
}
})(window);

var Drag = {
elem : null,
zindex : 0,
options : {},
init : function(){
each(arguments,function(i,elem,oThis){
addListener(elem,'mousedown',BindAsEventListener(oThis,oThis.start,elem));
},this);
},
start : function(e,elem){
var elem=this.elem = elem;
elem.style.zIndex=++this.zindex;
this.x = e.clientX - elem.offsetLeft ;
this.y = e.clientY - elem.offsetTop;
this.marginLeft = parseInt(currentStyle(elem).marginLeft)||0;
this.marginTop = parseInt(currentStyle(elem).marginTop)||0;
Sys.ie?elem.setCapture():e.preventDefault();
addListener(document,"mousemove",BindAsEventListener(this,this.move));
addListener(document,"mouseup",Bind(this,this.up));
this.options.callbackmove&&this.options.callbackmove(this.elem);
},
move : function(e){
window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();
var iLeft = e.clientX - this.x,iTop = e.clientY - this.y;obj = this.elem;
obj.style.left = iLeft - this.marginLeft + "px";
obj.style.top = iTop - this.marginTop + "px";
this.options.callbackmove&&this.options.callbackmove(this.elem);
},
up : function(){
removeListener(document,'mousemove');
removeListener(document,'mouseup');
Sys.ie&&this.elem.releaseCapture();
this.options.callbackup&&this.options.callbackup(this.elem);
}
};

var overlap = {
hostel :{}, //所有需要计算重合的元素
overlapList :{}, //已经重合的元素
init : function(elems){
each(elems,function(i,elem,oThis){
elem.setAttribute('overlap',i);
var ret = objPos(elem),l=ret.left,t=ret.top,b=ret.bottom,r=ret.right;
oThis.hostel[i]={elem:elem,leftTopDot:{x:l,y:t},leftBottomDot:{x:l,y:b},rightTopDot:{x:r,y:t},rightBottomDot:{x:r,y:b}};
},this);
},
setElem:function(elem){
if(!elem)return;
var ret = objPos(elem),l=ret.left,t=ret.top,b=ret.bottom,r=ret.right;
this.hostel[elem.getAttribute('overlap')] ={elem:elem,leftTopDot:{x:l,y:t},leftBottomDot:{x:l,y:b},rightTopDot:{x:r,y:t},rightBottomDot:{x:r,y:b}};
},
//判断是否重合
isOverlap : function(my){
var obj= {}, my = this.hostel[my.getAttribute('overlap')];

each(this.hostel,function(key,config,oThis){
// 是元素本身 则返回
if(config.elem === my.elem)return ;

//判断2个div是否重合 如果不重合 则返回
if(my.leftBottomDot.y<=config.leftTopDot.y||my.leftTopDot.y>=config.leftBottomDot.y||my.rightTopDot.x<=config.leftTopDot.x||my.leftTopDot.x>=config.rightTopDot.x)
return;
obj[config.elem.getAttribute('overlap')] =[config.elem,oThis.howOverlap(my,config)];
},this);
return obj;
},
//判断重合面积
howOverlap : function(my,other){
var l=other.leftBottomDot.x,r=other.rightTopDot.x,t=other.leftTopDot.y,b=other.leftBottomDot.y,arr=[],
lt = this.include(my.leftTopDot,l,r,t,b,'leftTopDot-rightBottomDot'),
lb = this.include(my.leftBottomDot,l,r,t,b,'leftBottomDot-rightTopDot'),
rt = this.include(my.rightTopDot,l,r,t,b,'rightTopDot-leftBottomDot'),
rb = this.include(my.rightBottomDot,l,r,t,b,'rightBottomDot-leftTopDot');
lt&&arr.push(lt)||lb&&arr.push(lb)||rt&&arr.push(rt)||rb&&arr.push(rb);

if(!arr[0]) return 0;
//一个点 或者是 2个点都在其中 计算方法是一样的
if(arr.length===1||arr.length===2){
var key = arr[0].split('-'),x1=my[key[0]].x,y1=my[key[0]].y,x2=other[key[1]].x,y2=other[key[1]].y;
return Math.abs((x1-x2)*(y1-y2));
};
//完全重合
if(arr.length===4){
return 162*162;
};
},
//看点是不是在另一个div中
include : function(dot,l,r,t,b,key){
return (dot.x>=l&&dot.x<=r&&dot.y>=t&&dot.y<=b)?key:false;
}
};
window.onload = function(){
extend(Drag.options,{callbackmove:move,callbackup:up});

function up(elem){
for(var n in overlap.overlapList)
removeClass(overlap.overlapList[n][0],'focus')
overlap.overlapList = {};
Drag.elem.innerHTML =Drag.elem.id;
};

function move(elem){
overlap.setElem(elem);
//p为判断返回的obj是不是空的
var obj = overlap.isOverlap(elem),name,p = function(o){
for (name in o)
return false;
return true;
}(obj);

//如果是个空对象 则返回 不进行下面的遍历
if(p){
up();
return;
};

var str ='';
overlap.overlapList = obj;
each(overlap.hostel,function(key,config){
if(obj[key]){
addClass(obj[key][0],'focus');
str = str +'与'+obj[key][0].id+'重合的面积为:'+obj[key][1]+'</br>';
}else{
removeClass(config.elem,'focus');
}
});
Drag.elem.innerHTML = str;
};
Drag.init($('demo1'),$('demo2'),$('demo3'),$('demo4'),$('demo5'),$('demo6'),$('demo7'),$('demo8'),$('demo9'));
overlap.init([$('demo1'),$('demo2'),$('demo3'),$('demo4'),$('demo5'),$('demo6'),$('demo7'),$('demo8'),$('demo9')]);
};
</script>
</body>
</html>

代码如上，只是感觉效率有点低，小伙伴们有没有什么优化方案呢，还请告之，不胜感激

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