标签：data oca 汉诺塔 tostring datastore eof pos get 结构
程序运行界面：如下图：
代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>汉诺塔</title>
</head>
<body>
<h1> 汉诺塔 </h1>
<canvas id = "canvas" width = 400, height = 300">
</canvas>
<div>
<button id = "ps" onclick=" pStep()"> <=== Preview Step </button>
<button id = "ns" onclick= "nStep()"> Next Step ===> </button>
</div>
<script>
function Stack(name) {
this.dataStore = [];
this.top = 0;
this.name = name;
this.push = push;
this.pop = pop;
this.peek = peek;
this.clear = clear;
this.length = length;
this.get = get;
this.drawDish = drawDish;
this.myCloneobj= myCloneobj;
}
function push(ele) {
this.dataStore[this.top ++] = ele;
}
function peek() {
return this.dataStore[this.top - 1];
}
function pop() {
return this.dataStore[-- this.top];
}
function clear() {
this.top = 0;
}
function length() {
return this.top;
}
function get(n){
return this.dataStore[n-1];
}
function Block(size, location){
this.size = size;
this.location = location;
this.setLocation = setLocation;
this.getSize = getSize;
}
function setLocation(location)
{
this.location = location;
}
function getSize()
{
return this.size;
}
function drawDish(){
var canvas = document.getElementById(‘canvas‘);
if (canvas.getContext) {
var ctx = canvas.getContext(‘2d‘);
var width, height, layer, pole, xPos, yPos;
//x基准点125， y基准点205
//画一个柱子
pole = this.name;
n = this.length();
b = new Block();
console.log(" draw pole %d, length %d", pole , n);
while (n>0){
b = this.get(n);
var size = b.size;
width = (size+2)*10;
height = 20;
layer = n - 1;
xPos = 125 + pole * 75 - width/2;
yPos = 205 - layer*25 - height/2 ;
roundedRect(ctx, xPos, yPos, width, height, 15);
ctx.fillStyle = "red";
ctx.fill();
n--;
}
}
}
function myCloneobj()
{
o = new Stack(this.name);
console.log("clone pole %d", this.name);
n = this.length();
var i=1;
while (i <= n)
{
var bt = this.get(i);
var size = bt.size;
var location = bt.location;
b = new Block(size, location);
o.push(b);
console.log("insert new b size %d, location %d", size, location);
i=i+1;
}
return o;
}
//深复制对象方法
function cloneObj(obj) {
//1
var newJsonObj = {};
newJsonObj = JSON.parse(JSON.stringify(obj));
//2
for (items in obj) {
if (typeof obj[items] == "function" || typeof obj[items] == "undefined" || obj[items] instanceof RegExp) {
newJsonObj[items] = obj[items];
}
}
//3
var newObj = new obj.constructor;
for (items in newJsonObj) {
newObj[items] = newJsonObj[items]
}
return newObj;
}
//深复制对象方法
var cloneObj2 = function (obj) {
var newObj = {};
if (obj instanceof Array) {
newObj = [];
}
for (var key in obj) {
var val = obj[key];
//newObj[key] = typeof val === ‘object‘ ? arguments.callee(val) : val; //arguments.callee 在哪一个函数中运行，它就代表哪个函数, 一般用在匿名函数中。
newObj[key] = typeof val === ‘object‘ ? cloneObj2(val): val;
}
return newObj;
};
function roundedRect(ctx, x, y, width, height, radius){
ctx.beginPath();
ctx.moveTo(x, y + radius);
ctx.lineTo(x, y + height - radius);
ctx.quadraticCurveTo(x, y + height, x + radius, y + height);
ctx.lineTo(x + width - radius, y + height);
ctx.quadraticCurveTo(x + width, y + height, x + width, y + height - radius);
ctx.lineTo(x + width, y + radius);
ctx.quadraticCurveTo(x + width, y, x + width - radius, y);
ctx.lineTo(x + radius, y);
ctx.quadraticCurveTo(x, y, x, y + radius);
ctx.stroke();
}
function drawRect(){
var canvas = document.getElementById(‘canvas‘);
if (canvas.getContext) {
var ctx = canvas.getContext(‘2d‘);
ctx.fillStyle = "black";
//画边框
ctx.strokeRect(10, 10, 380, 280);
//画左柱子
ctx.fillRect(120, 100, 10, 120);
ctx.fillRect(100, 220, 50, 20);
//画中柱子
ctx.fillRect(195, 100, 10, 120);
ctx.fillRect(175, 220, 50, 20);
//画右柱子
ctx.fillRect(270, 100, 10, 120);
ctx.fillRect(250, 220, 50, 20);
//ctx.clearRect(125, 25, 10, 200);
//ctx.strokeRect(50, 50, 50, 50);
}
}
function drawText(str) {
var canvas = document.getElementById(‘canvas‘);
if (canvas.getContext){
var ctx = canvas.getContext(‘2d‘);
ctx.font = "16px serif";
ctx.fillText(str, 20, 40);
}
}
function clear(){
var canvas = document.getElementById(‘canvas‘);
if (canvas.getContext) {
var ctx = canvas.getContext(‘2d‘);
ctx.clearRect(20,20,360,260);
ctx.fillStyle = "black";
}
}
function moveBlock(s1,s2){
if(s1.length() > 0){
if( (s2.length() == 0) || ((s2.length() > 0) && (s2.peek().size > s1.peek().size))){
b = s1.pop();
b.location = s2.name;
s2.push(b);
console.log("block %d move form %d to %d", b.size, s1.name, s2.name);
//如果是简单变量，会直接创建并复制，如果是类变量，特别是有复杂结构的类变量，只是复制一个地址。
process.push(s1.name);
process.push(s2.name);
}
}
}
function hanoi(n, a, b, c){
if (n == 1){
moveBlock(a, c);
}
else{
hanoi(n - 1, a, c, b);
moveBlock(a, c);
hanoi(n - 1, b, a, c);
}
}
var step = 0;
function draw(a, b, c) {
var str = " Hanota process ";
var s = step + 1;
str = str.concat( s.toString(), " steps");
clear();
drawText(str);
drawRect();
a.drawDish();
b.drawDish();
c.drawDish();
}
var level = 4;
var process = [];
var leftPole = new Stack(0);//0 - leftPole
var middlePole = new Stack(1);//1 - middlePole
var rightPole = new Stack(2);//2 - rightPole
var i = level;
while (i>0){
var block = new Block(i, 0);
leftPole.push(block);
i--;
}
var leftPolebk = leftPole.myCloneobj();
var middlePolebk = middlePole.myCloneobj();
var rightPolebk = rightPole.myCloneobj();
draw(leftPolebk, middlePolebk, rightPolebk);
hanoi(level, leftPole, middlePole, rightPole);
var n = level;
var maxStep = 1;
while (n>0) {
maxStep = maxStep*2;
n=n-1;
}
maxStep = maxStep - 1;
function pStep()
{
step = step - 1;//退回上一个节点
if (step >= 0){
var p1 = process[step*2];
var p2 = process[step*2+1];
console.log(" step %d move from %d to %d ",step, p2, p1);
if (p2 == 0)
var b = leftPolebk.pop();
else if (p2==1)
b = middlePolebk.pop();
else if (p2==2)
b = rightPolebk.pop();
else
alert("wrong1");
if (p1 == 0)
leftPolebk.push(b);
else if (p1 == 1)
middlePolebk.push(b);
else if (p1 == 2)
rightPolebk.push(b);
else
alert("wrong2");
draw(leftPolebk, middlePolebk, rightPolebk);
}
else
{
step=0
}
}
function nStep()
{
if (step <= maxStep){
var p1 = process[step*2];
var p2 = process[step*2+1];
console.log(" step %d move from %d to %d ",step, p1, p2);
if (p1 == 0)
var b = leftPolebk.pop();
else if (p1==1)
b = middlePolebk.pop();
else if (p1==2)
b = rightPolebk.pop();
else
return;
if (p2 == 0)
leftPolebk.push(b);
else if (p2 == 1)
middlePolebk.push(b);
else if (p2 == 2)
rightPolebk.push(b);
else
return;
draw(leftPolebk, middlePolebk, rightPolebk);
step = step + 1;//指向下一个节点
}
}
</script>
</body>
</html>
1. Canvas画布，画塔，盘子和移动说明文字
2. 用Stack类，存放柱子信息，类是用堆栈来实现的, 类的名称属性，表示是哪一根柱子，左，中，还是右？
function Stack(name) {
this.dataStore = [];
this.top = 0;
this.name = name;
3. 用Block类，存放盘子信息，size表示盘子的大小，Location标明盘子在那个柱子上。
function Block(size, location){
this.size = size;
this.location = location;
this.setLocation = setLocation;
this.getSize = getSize;
}
4. 初始化时候，生成了3个盘子，3个柱子，并把3个盘子push到最左边的柱子上。
5. 调用画图函数，画出背景信息，三个柱子信息。
6. 调用递归函数，实现盘子移动
function hanoi(n, a, b, c){ if (n == 1){ moveBlock(a, c); } else{ hanoi(n - 1, a, c, b); moveBlock(a, c); hanoi(n - 1, b, a, c); } }
程序本身没有什么好说的，这里需要说明的是如何将移动的步骤保存下来。
尝试了三种方法：
1、在递归调用过程中，复制对象到一个数组中
2、在递归调用中，将程序停下来
3. 保存移动过程信息，到一个数组中
由于JavaScript对于对象的复制，对于Obj，只复制一个链接。这样导致的结果，复制下来的对象，在数组中都是一样的。
后来采用深度复制的方式，将obj中的obj，全部new来，但是这种方法，对于静态操作有效，在递归迭代过程中，第一层的还能复制，但是第二次以后的，都复制不了了。
在递归调用过程中，尝试alert, promote， sleep方法，暂停程序的执行。但是这种方法，只对异步的操作有效（你给我消息，我相应），但是对于这种代码执行迭代过程，是卡不住的。
最后只好采用一个数组，只记录移动盘子的原和目的地址信息。
7. 移动过程演示
因为递归调用过程，是不能暂停程序的。用了数组将盘子移动的过程录制下来。
在演示过程中，读取录制的移动过程数据，让操作过程再执行一遍。
这里克隆了三个对象，用于操作过程的演示。
var leftPolebk = leftPole.myCloneobj();
var middlePolebk = middlePole.myCloneobj();
var rightPolebk = rightPole.myCloneobj();
8.
标签：data oca 汉诺塔 tostring datastore eof pos get 结构
原文地址：https://www.cnblogs.com/montai/p/13217191.html
