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| <!DOCTYPE html>
<html>
<head>
<title> 数据结构-栈的应用 </title>
<meta http-equiv="Content-type" content="text/html;charset=utf-8;" >
<style>
*{margin:0;padding:0;}
#container .line{display:block;float:left;}
.block{width:15px;height:15px;float:left;font-size:8px;border-right:1px solid #111;border-bottom:1px solid #111;}
.bld{background:black;color:#fff;}
.start{background:red;color:#fff;}
.end{background:red;color:#f00;}
.route{background:red;}
</style>
<script type="text/javascript" src="https://cdn.bootcss.com/jquery/1.12.1/jquery.min.js"></script>
</head>
<body>
<h1>使用栈来找路径</h1>
<p>
查找从左上角到右下角的路径，图中的方块表示障碍；点击方块可以改变其状态（通或者不通）
</p>
<button text='clear' id="btn-clear">清除路径</button>
<button text='clear' id="btn-find">查找路径</button>
<div id='container'></div>
<script type="text/javascript">
<!--
/***** 入口函数 ****/
$(function(){
init();
addEvents();
});
function init(){
window.M_x = 70; //矩阵的宽和高
window.M_y = 45;
window.Matrix = createMatrix(M_x , M_y);
showMatrixAsDivBlock(M_x , M_y);
setDisableBlocks(M_x , M_y , 1100);
var n1 = [2 , 2];
var n2 = [M_y-2 ,M_x-2];
window.startNode = n1;
window.endNode = n2;
$(getid(n1)).addClass('start').addClass('route').text('from');
$(getid(n2)).addClass('end').addClass('route').text('end');
}
/****创建界面****/
function showMatrixAsDivBlock(x , y){
var div =[]
var line=[];
var i , j;
for(i = 1 ; i < y ; i++){
for(j = 1 ; j < x ; j++){
line[j] = "<div id='b-"+i+'-'+j+"' class='block'></div>";
}
div[i] = '<div class="line">' + line.join('') + '</div>';
}
$('#container').html(div.join('')+'<div style="clear:both;"></div>');
}
/*****创建矩阵****/
function createMatrix(M_x , M_y){
var Matrix = [];
for(i = 1; i < M_y; i++){
Matrix[i] = [];
for(j = 1; j < M_x; j++){
if(i==1 || i==M_y-1 || j==1 || j==M_x-1){
var s = true;
}else{
var s = false;
}
Matrix[i][j] = {
disable :s /// 标示当前的节点是否为阻断 1 ：阻断 ，0 ：联通
,x :i /// 标示当前节点的x坐标
,y :j /// 标示当前节点的y坐标
,inRoute:false ///标示当前节点是否在路径中
,direction:{ /// 标示当前节点四个方向是否被遍历过
left:0 , bottom:0 , right:0 , top:0
}
};
}
}
return Matrix;
}
/*将所有的障碍设置起来*/
function setDisableBlocks(M_x , M_y , count){
var i ; var j;
for(i=1 ; i< M_y ; i++){
for(j=1 ; j < M_x ; j++){
if(i==1 || j == 1 || i == M_y-1 || j == M_x-1){
Matrix[i][j].disable = true;
$('#b-'+i+'-'+j).addClass('bld');
}
}
}
while(count){
i = parseInt((Math.random() * 10000))% M_y;
j = parseInt((Math.random() * 10000))% M_x;
if((i==2 && j==2) || (i==M_y-2 && j ==M_x-2)){
continue;
}
if(i > 1 && i < M_y && j > 1 && j < M_x){
Matrix[i][j].disable = true;
$('#b-'+i+'-'+j).addClass('bld');
count--;
}
}
}
/***设置所有“方块”以及两个按钮的单击事件***/
function addEvents(){
/**清除路径按钮**/
$('#btn-clear').click(function(){
for(i = 1 ; i < M_y ; i++){
for(j = 1 ; j < M_x ; j++){
var o = window.Matrix[i][j];
o.inRoute = false;
o.direction={left:0 , bottom:0 , right:0 , top:0};
}
}
if(window.Stack){
for(i=0 ; i < Stack.length ; i++){
var o = Stack[i];
$(getid([o.x , o.y])).removeClass('route').html('');
}
}
});
/**查找路径按钮**/
$('#btn-find').click(function(){
$('#btn-clear').click();
find(window.Matrix ,window.startNode , window.endNode);
});
/** 方块单击事件**/
$('.block').click(function(){
var id = $(this).attr('id');
var ary = id.split('-');
var i = ary[1];
var j = ary[2];
if(i == 1 || j == 1 || i == M_y || j == M_x){;}else{// 不能改变四个边的状态
Matrix[i][j].disable = !Matrix[i][j].disable;
$('#'+id).toggleClass('bld');
}
});
}
// 查找路径
function find(Matrix , n1 , n2){
// 先标示 起点和终点
$(getid(n1)).addClass('start').addClass('route').text('from');
$(getid(n2)).addClass('end').addClass('route').text('end');
var start = getObject(Matrix , n1);
var end = getObject(Matrix , n2)
var cur = start;
window.Stack = Stack = [];
start.inRoute = true;
while(true){
if(cur.direction.left == 0 && (o = getObject(Matrix , [cur.x , cur.y+1])) && !o.disable ){// && !o.inRoute){
cur.direction.left=1;
o.direction.right=1;
o.inRoute = true;
Stack.push(cur);
Stack.push(o);
cur = o;
}else if(cur.direction.bottom == 0 && (o = getObject(Matrix , [cur.x+1 , cur.y])) && !o.disable ){// && !o.inRoute){
cur.direction.bottom=1;
o.direction.top=1;
o.inRoute = true;
Stack.push(cur);
Stack.push(o);
cur = o;
}else if(cur.direction.right == 0 && (o = getObject(Matrix , [cur.x , cur.y-1])) && !o.disable){// && !o.inRoute){
cur.direction.right=1;
o.direction.left=1;
o.inRoute = true;
Stack.push(cur);
Stack.push(o);
cur = o;
}else if(cur.direction.top == 0 && (o = getObject(Matrix , [cur.x-1 , cur.y])) && !o.disable ){// && !o.inRoute){
cur.direction.top=1;
o.direction.bottom=1;
o.inRoute = true;
Stack.push(cur);
Stack.push(o);
cur = o;
}else{
cur = Stack.pop();
if(cur){
cur.inRoute = false;
}else{
showMsg('没有路径连接两个点！');
break;
}
}
if( cur.x == start.x && cur.y == start.y && start.direction.left && start.direction.bottom && start.direction.right && start.direction.top){
showMsg('没有路径连接两个点！');
break;
}
if( cur.x == end.x && cur.y == end.y){
break;
}
}
for(i=0 ; i < Stack.length ; i++){
var tmp = Stack[i];
$(getid([tmp.x , tmp.y])).addClass('route').html(i/2);
}
}
// 显示信息
function showMsg(msg){
alert(msg);
}
function getObject(Matrix , arg){
if(Matrix[arg[0]] && Matrix[arg[0]][arg[1]]){
return Matrix[arg[0]][arg[1]];
}else{
return null
}
}
/**
* 将基于javascript 数组形式的 arg 转换为 jquery id形式
* 用来查找页面中的方块
* 如 : [3,4] => “#b-3-4”
**/
function getid(arg){
return '#b-'+arg[0]+'-'+arg[1];
}
//-->
</script>
</body>
</html>
|
代码如下