广度优先搜索算法

hang0 2011-02-14

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>8方向双向广搜</title>
</head>

<body>
<script type="text/javascript">
var tb = [], o, r, c, n=0, newHash;
var dir=[ [-1,0], [1,0], [0,-1], [0,1], [-1,-1], [1,1], [1,-1], [-1,1] ];
function sou(hash){
	newHash = {};
	for(var i in hash){
		for(var j=0; j<8; j++){
			r = hash[i].row + dir[j][0];
			c = hash[i].col + dir[j][1];
			if(r<0||c<0||r==rows||c==cols||tb[r][c].tp==1||tb[r][c].tp==hash[i].tp) continue;
			o = tb[r][c];
			if(o.tp!=0) {alert(new Date()-time);return show(o)(hash[i]);}
			o.parent = hash[i];
			o.tp = o.parent.tp;
			//o.obj.style.backgroundColor = "#CC66FF";
			newHash[r+"."+c] = o;
		}
	}
	//alert("第"+(++n)+"步");
	sou(newHash);
}
function show(o){
	if(!o.parent) return show;
	o.obj.style.backgroundColor = "yellow";
	return show(o.parent);
}

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];

var rows = mapArr.length+2;
var cols = mapArr[0].length+2;
var hash={};
for(r=0; r<rows; r++){
	tb[r] = [];
	for(c=0; c<cols; c++){
		o = {row:r, col:c};
		o.tp = r>0&&c>0&&r<rows-1&&c<cols-1 ? mapArr[r-1][c-1] : 1;
		var bg = "blue";
		switch(o.tp){
			case 1: bg = "red"; break;
			case 2: bg = "green"; hash[r+"."+c]=o; break;
			case 3: bg = "black"; hash[r+"."+c]=o; break;
		}
		o.obj = document.createElement("img");
		o.obj.style.cssText = "position:absolute; left:"+c*10+"px; top:"+r*10+"px; background-color:"+bg+"; width:10px; height:10px;";
		this.tb[r][c] = o;
		document.body.appendChild(o.obj);
	}
}
document.write('<input style="position:absolute;top:'+(rows*10+20)+'px" type="button" value="查找路径" onclick="time=new Date();sou(hash)" />')
</script>
</body>
</html>

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