在线生成红黑树（含变形步骤）
为了大家方便学习和讲解红黑树，特制作这个在线生成红黑树。而且每次删除和新增破坏了红黑树特性导致变形，还会罗列出变形步骤。
学数据结构推荐大家查看 skywang12345（如果天空不死）的博客 http://www.cnblogs.com/skywang12345/p/3603935.html
在线演示地址：http://sandbox.runjs.cn/show/2nngvn8w
源码：
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>在线生成红黑树（含变形步骤）</title>
</head>
<body>
<div>
<ul>
<li>增加节点</li>
<li>方式一：<input type="button" value="随机增加一个节点" title="随机增加一个节点" onclick="AddRandom()" /></li>
<li>方式二：<input id="numbertext" title="" placeholder="请用,(单字节)分割数字,0-999之间的数字" value="" /><input type="button" value="一个一个节点增加" title="增加一个节点" onclick="AddOneNumber()" /></li>
<li></li>
<li>删除节点</li>
<li><input id="deleteNumberText" type="text" placeholder="请输入需要删除的节点" /><input type="button" value="删除" onclick="DeleteNumber()" /> </li>
<li></li>
<li>参考： http://www.cnblogs.com/skywang12345/p/3603935.html </li>
</ul>
</div>
<form>
<fieldset>
<legend>红黑树</legend>
<div id="currentView"></div>
</fieldset>
</form>
<form id="stepView"></form>
<!--我的博客： http://www.cnblogs.com/bbvi/ -->
<script>
var NodeColor = { Black: "black", Red: "red" };
var RBNode = function (_date, _paret, _color) {
this.Data = _date;
this.Parent = _paret;
this.Color = _color;
this.LeftNode = null;
this.RightNode = null;
}
var RedBlackBinaryTree = function () {
this.RootNode = null;//根节点
this.Insert = function (insertValue) {
if (this.RootNode == null) {
this.RootNode = new RBNode(insertValue, null, NodeColor.Black);
} else {
var newNode = insert.call(this, insertValue);
insertFixUp.call(this, newNode);
}
}
function insert(key) {
ClearStepView();//清空分解步骤
var node = this.RootNode;
var newNode = new RBNode(key, null, NodeColor.Red);
while (true) {
if (key > node.Data) {
if (node.RightNode == null) {
newNode.Parent = node;
node.RightNode = newNode;
break;
}
node = node.RightNode;
} else if (key < node.Data) {
if (node.LeftNode == null) {
newNode.Parent = node;
node.LeftNode = newNode;
break;
}
node = node.LeftNode;
} else {
break;
}
}
return newNode;
}
function insertFixUp(node) {
var parentNode = node.Parent;
if (parentNode != null && NodeColor.Red == parentNode.Color) {
var gprentNode = parentNode.Parent;
if (parentNode == gprentNode.LeftNode) {
var uncleNode = gprentNode.RightNode;
if (uncleNode != null && NodeColor.Red == uncleNode.Color) {
CreateStepView(this.RootNode, "insertCaseA1", node.Data);//记录分解步骤
parentNode.Color = NodeColor.Black;
uncleNode.Color = NodeColor.Black;
gprentNode.Color = NodeColor.Red;
CreateStepView(this.RootNode, "insertSolutionA1");//记录分解步骤
insertFixUp.call(this, gprentNode);
} else {
if (parentNode.RightNode == node) {
CreateStepView(this.RootNode, "insertCaseB1", node.Data);//记录分解步骤
leftRotation.call(this, parentNode);
CreateStepView(this.RootNode, "insertSolutionB1");//记录分解步骤
insertFixUp.call(this, parentNode);
} else if (parentNode.LeftNode == node) {
CreateStepView(this.RootNode, "insertCase3", node.Data);//记录分解步骤
parentNode.Color = NodeColor.Black;
gprentNode.Color = NodeColor.Red;
rightRotation.call(this, gprentNode);
CreateStepView(this.RootNode, "insertSolution3");//记录分解步骤
}
}
} else {
var uncleNode = gprentNode.LeftNode;
if (uncleNode != null && NodeColor.Red == uncleNode.Color) {
CreateStepView(this.RootNode, "insertCaseA1", node.Data);//记录分解步骤
parentNode.Color = NodeColor.Black;
uncleNode.Color = NodeColor.Black;
gprentNode.Color = NodeColor.Red;
CreateStepView(this.RootNode, "insertSolutionA1");//记录分解步骤
insertFixUp.call(this, gprentNode);
} else {
if (parentNode.LeftNode == node) {
CreateStepView(this.RootNode, "insertCase4", node.Data);//记录分解步骤
rightRotation.call(this, parentNode);
CreateStepView(this.RootNode, "insertSolution4");//记录分解步骤
insertFixUp.call(this, parentNode);
} else if (parentNode.RightNode == node) {
CreateStepView(this.RootNode, "insertCase5", node.Data);//记录分解步骤
parentNode.Color = NodeColor.Black;
gprentNode.Color = NodeColor.Red;
leftRotation.call(this, gprentNode);
CreateStepView(this.RootNode, "insertSolution5");//记录分解步骤
}
}
}
}
this.RootNode.Color = NodeColor.Black;
}
function leftRotation(node) {
var temp = node.RightNode;
node.RightNode = temp.LeftNode;
if (temp.LeftNode != null) {
temp.LeftNode.Parent = node;
}
temp.Parent = node.Parent;
if (node.Parent == null) {
this.RootNode = temp;
}
else {
if (node.Parent.LeftNode == node) {
node.Parent.LeftNode = temp;
} else {
node.Parent.RightNode = temp;
}
}
temp.LeftNode = node;
node.Parent = temp;
}
function rightRotation(node) {
var temp = node.LeftNode;
node.LeftNode = temp.RightNode;
if (temp.RightNode != null) {
temp.RightNode.Parent = node;
}
temp.Parent = node.Parent;
if (node.Parent == null) {
this.RootNode = temp;
} else {
if (node == node.Parent.RightNode) {
node.Parent.RightNode = temp;
} else {
node.Parent.LeftNode = temp;
}
}
temp.RightNode = node;
node.Parent = temp;
}
this.Remove = function (key) {
var node = search.call(this, this.RootNode, key);
if (node == null) {
return;
} else {
remove.call(this, node);
}
}
function remove(node) {
ClearStepView();//清空分解步骤
var child, parent, nodeColor;
if (node.LeftNode != null && node.RightNode != null) {
CreateStepView(this.RootNode, "deleteCase8", node.Data);//记录分解步骤
var tempNode = findMin(node.RightNode);
if (node.Parent == null) {
this.RootNode = tempNode;
} else {
if (node.Parent.LeftNode == node) {
node.Parent.LeftNode = tempNode;
} else {
node.Parent.RightNode = tempNode;
}
}
child = tempNode.RightNode;
parent = tempNode.Parent;
nodeColor = tempNode.Color;
if (parent.Data == node.Data) {
parent = tempNode;
} else {
if (child != null) {
child.Parent = parent;
}
parent.LeftNode = child;
tempNode.RightNode = node.RightNode;
node.RightNode.Parent = tempNode;
}
tempNode.Parent = node.Parent;
tempNode.Color = node.Color;
tempNode.LeftNode = node.LeftNode
node.LeftNode.Parent = tempNode;
CreateStepView(this.RootNode, "deleteSolution8");//记录分解步骤
if (nodeColor == NodeColor.Black) {
removeFixUp.call(this, child, parent);
}
} else {
CreateStepView(this.RootNode, "deleteCase9", node.Data);//记录分解步骤
if (node.LeftNode != null) {
child = node.LeftNode;
} else {
child = node.RightNode;
}
parent = node.Parent;
nodeColor = node.Color;
if (child != null) {
child.Parent = parent;
}
if (parent != null) {
if (parent.LeftNode != null && parent.LeftNode.Data == node.Data) {
parent.LeftNode = child;
} else {
parent.RightNode = child;
}
} else {
this.RootNode = child;
}
CreateStepView(this.RootNode, "deleteSolution9");//记录分解步骤
if (nodeColor == NodeColor.Black) {
removeFixUp.call(this, child, parent)
}
}
node = null;
}
function removeFixUp(node, parentNode) {
var otherNode;
while ((node == null || node.Color == NodeColor.Black) && (node != this.RootNode)) {
if (parentNode.LeftNode == node) {
otherNode = parentNode.RightNode;
if (otherNode.Color == NodeColor.Red) {
CreateStepView(this.RootNode, "deleteCase1");//记录分解步骤
otherNode.Color = NodeColor.Black;
parentNode.Color = NodeColor.Red;
leftRotation.call(this, parentNode);
otherNode = parentNode.RightNode;
CreateStepView(this.RootNode, "deleteSolution1");//记录分解步骤
}
if ((otherNode.LeftNode == null || otherNode.LeftNode.Color == NodeColor.Black) &&
(otherNode.RightNode == null || otherNode.RightNode.Color == NodeColor.Black)) {
CreateStepView(this.RootNode, "deleteCase3");//记录分解步骤
otherNode.Color = NodeColor.Red;
node = parentNode;
parentNode = node.Parent;
CreateStepView(this.RootNode, "deleteSolution3");//记录分解步骤
} else {
if (otherNode.RightNode == null || otherNode.RightNode.Color == NodeColor.Black) {
CreateStepView(this.RootNode, "deleteCase4");//记录分解步骤
otherNode.LeftNode.Color == NodeColor.Black;
otherNode.Color = NodeColor.Red;
rightRotation.call(this, otherNode);
otherNode = parentNode.RightNode;
CreateStepView(this.RootNode, "deleteSolution4");//记录分解步骤
}
CreateStepView(this.RootNode, "deleteCase6");//记录分解步骤
otherNode.Color = parentNode.Color;
parentNode.Color = NodeColor.Black;
otherNode.RightNode.Color = NodeColor.Black;
leftRotation.call(this, parentNode);
node = this.RootNode;
CreateStepView(this.RootNode, "deleteSolution6");//记录分解步骤
break;
}
} else {
otherNode = parentNode.LeftNode;
if (otherNode.Color == NodeColor.Red) {
CreateStepView(this.RootNode, "deleteCase2");//记录分解步骤
otherNode.Color = NodeColor.Black;
parentNode.Color = NodeColor.Red;
rightRotation.call(this, parentNode);
otherNode = parentNode.LeftNode;
CreateStepView(this.RootNode, "deleteSolution2");//记录分解步骤
}
if ((otherNode.LeftNode == null || otherNode.LeftNode.Color == NodeColor.Black) &&
(otherNode.RightNode == null || otherNode.RightNode.Color == NodeColor.Black)) {
CreateStepView(this.RootNode, "deleteCase3");//记录分解步骤
otherNode.Color = NodeColor.Red;
node = parentNode;
parentNode = node.parent;
CreateStepView(this.RootNode, "deleteSolution3");//记录分解步骤
} else {
if (otherNode.LeftNode == null || otherNode.LeftNode.Color == NodeColor.Black) {
CreateStepView(this.RootNode, "deleteCase5");//记录分解步骤
otherNode.RightNode.Color = NodeColor.Black;
otherNode.Color = NodeColor.Red;
leftRotation.call(this, otherNode);
otherNode = parentNode.LeftNode;
CreateStepView(this.RootNode, "deleteSolution5");//记录分解步骤
}
CreateStepView(this.RootNode, "deleteCase7");//记录分解步骤
otherNode.Color = parentNode.Color;
parentNode.Color = NodeColor.Black;
otherNode.LeftNode.Color = NodeColor.Black;
rightRotation.call(this, parentNode);
node = this.RootNode;
CreateStepView(this.RootNode, "deleteSolution7");//记录分解步骤
break;
}
}
}
if (node != null) {
node.Color = NodeColor.Black;
}
}
this.Search = function (key) {
return search.call(this, this.RootNode, key);
}
function search(node, key) {
if (node == null) {
return null;
}
if (node.Data > key) {
return search(node.LeftNode, key);
} else if (node.Data < key) {
return search(node.RightNode, key);
} else {
return node;
}
}
this.FindMin = function () {
return findMin(this.RootNode);
}
function findMin(node) {
if (node.LeftNode == null) {
return node;
}
return findMin(node.LeftNode);
}
this.FindMax = function () {
return findMax(this.RootNode)
}
function findMax(node) {
if (node.RightNode == null) {
return node;
}
return findMax(node.RightNode);
}
this.SearchRange = function (minKey, maxKey) {
return searchRange(minKey, maxKey, this.RootNode, []);
}
function searchRange(minKey, maxKey, node, nodeList) {
if (node == null) {
return nodeList;
}
if (node.Data > minKey) {
searchRange(minKey, maxKey, node.LeftNode, nodeList);
}
if (node.Data >= minKey && node.Data < maxKey) {
nodeList.push(node.Data);
}
if (node.Data < maxKey) {
searchRange(minKey, maxKey, node.RightNode, nodeList);
}
return nodeList;
}
this.LevelOrder = function (action) {
levelOrder(this.RootNode, action);
}
function levelOrder(node, action) {
var stack = [];
stack.push(node);
while (stack.length > 0) {
var temp = stack.pop();
action(temp);
if (temp.LeftNode != null) {
stack.push(temp.LeftNode);
}
if (temp.RightNode != null) {
stack.push(temp.RightNode);
}
}
}
this.PreOrder = function (action) {
treeOrder(this.RootNode, action, null, null);
}
this.InOrder = function (action) {
treeOrder(this.RootNode, null, action, null);
}
this.PostOrder = function (action) {
treeOrder(this.RootNode, null, null, action);
}
function treeOrder(node, preOrderAction, inOrderAction, postOrderAction) {
if (preOrderAction) {
preOrderAction(node);
}
if (node.LeftNode != null) {
treeOrder(node.LeftNode, preOrderAction, inOrderAction, postOrderAction);
}
if (inOrderAction) {
inOrderAction(node);
}
if (node.RightNode != null) {
treeOrder(node.RightNode, preOrderAction, inOrderAction, postOrderAction);
}
if (postOrderAction) {
postOrderAction(node);
}
}
}
</script>
<script>
var height = 50;//节点之间的高
var width = 15;//节点之间的宽
var tops = 40;//根节点离顶部的距离
var foot = 40;//树离底部距离
var spacing = 30;//树分别离两边的间距
var tree = new RedBlackBinaryTree();
function AddOneNumber() {
var numbertext = document.getElementById("numbertext").value;
var oneNums = numbertext.match(/[1-9][0-9]{0,2}\,?/);
document.getElementById("numbertext").value = numbertext.replace(/[1-9][0-9]{0,2}\,?/, "");
var num = (oneNums + "").match(/[1-9][0-9]{0,2}/);
if (!!num) {
AddNumber(parseInt(num));
}
}
function AddRandom() {
AddNumber(Math.floor(Math.random() * (1000)));
}
function AddAllNumber() {
while (true) {
AddOneNumber();
var numbertext = document.getElementById("numbertext").value;
if (!/[1-9][0-9]{0,2}/.test(numbertext)) {
break;
}
}
}
function AddNumber(number) {
tree.Insert(number);
RenewView(tree);
}
function DeleteNumber() {
var deleteNumberText = document.getElementById("deleteNumberText").value;
if (!deleteNumberText.match(/^[1-9][0-9]{0,2}$/)) {
alert("请正确输入1-999的整数");
return false;
}
var number = parseInt(deleteNumberText);
var isExist = tree.Search(number);
if (!isExist)
{
alert("不存在此节点");
return false;
}
tree.Remove(number);
document.getElementById("deleteNumberText").value = '';
RenewView(tree);
}
function RenewView(_tree) {
var currentView = document.getElementById("currentView");
currentView.innerHTML = '';
CreateTreeView(_tree.RootNode, currentView);
}
function CreateTreeView(rootNode, hostDocument) {
var size = SetCanvasWidthHeight(rootNode);
var canvas = document.createElement("canvas");
canvas.style.backgroundColor = "antiquewhite";
canvas.style.display = "block";
canvas.height = size.height;
canvas.width = size.width;
var context = canvas.getContext("2d");
hostDocument.appendChild(canvas);
SetPoint(rootNode);
PreOrder(rootNode, SetPreOrder, context, canvas.width);
}
function PreOrder(node, action, context, canvasWidth) {
action(node, context, canvasWidth);
if (node.LeftNode != null) {
PreOrder(node.LeftNode, action, context, canvasWidth);
}
if (node.RightNode != null) {
PreOrder(node.RightNode, action, context, canvasWidth);
}
}
function SetCanvasWidthHeight(rootNode) {
var level = Level(rootNode);
return {
height: height * level + tops + foot,
width: Math.pow(2, level + 1) * width + spacing * 2
};
}
function SetPreOrder(node, context, canvasWidth) {
var container = drawArc(
context,
node.Data,
canvasWidth / 2 + width * node.nodePoint,
(node.nodeLevel * height + parseInt(tops)),
node.Color);
if (node.Parent != null) {
var line = linkNode(
context,
(canvasWidth / 2 + width * node.Parent.nodePoint),
(node.Parent.nodeLevel * height + parseInt(tops)),
(node.Data, canvasWidth / 2 + width * node.nodePoint),
(node.nodeLevel * height + parseInt(tops)));
}
}
//生产节点
function drawArc(context, number, x, y, color) {
//圆
context.beginPath();
context.fillStyle = color;
context.arc(x, y, 15, (Math.PI / 180) * 0, (Math.PI / 180) * 360, false);
context.fill();
context.closePath();
//数字
var textX = x;
var textY = y + 5;
if (number < 10) {
textX -= 5;
} else if (number > 9 && number < 100) {
textX -= 8;
} else {
textX -= 12;
}
context.fillStyle = "white";
context.font = "bold 15px Arial";
context.fillText(number + "", textX, textY);
}
//链接节点
function linkNode(context, fatherNodeX, fatherNodeY, childrenNodeX, childrenNodeY) {
drawLine(context, fatherNodeX, fatherNodeY + 15, childrenNodeX, childrenNodeY - 15);
}
//生产线
function drawLine(context, x, y, toX, toY) {
context.moveTo(x, y);
context.lineTo(x, y);
context.lineTo(toX, toY);
context.stroke();
}
var maxLevel;
var level;
function Level(rootNode) {
maxLevel = 0;
level = 0;
return levels(rootNode);
}
function levels(node) {
if (node.LeftNode != null) {
level++;
levels(node.LeftNode);
}
maxLevel = Math.max(maxLevel, level);
if (node.RightNode != null) {
level++;
levels(node.RightNode);
}
level--;
return maxLevel;
}
function SetPoint(rootNode) {
var thisMaxLevel = Level(rootNode);
var childQuanty = Math.pow(2, thisMaxLevel);
rootNode.nodeLevel = 0;
rootNode.nodePoint = 0;
if (rootNode.LeftNode != null) {
setPointsLeft(rootNode.LeftNode, -1 * childQuanty / 2, 0, thisMaxLevel - 1);
}
if (rootNode.RightNode != null) {
setPointsRight(rootNode.RightNode, childQuanty / 2, 0, thisMaxLevel - 1);
}
}
function setPointsLeft(node, point, levels, thisMaxLevel) {
++levels;
node.nodeLevel = levels;
node.nodePoint = point;
if (node.LeftNode != null) {
setPointsLeft(node.LeftNode, point - Math.pow(2, thisMaxLevel - levels), levels, thisMaxLevel);
}
if (node.RightNode != null) {
setPointsLeft(node.RightNode, point + Math.pow(2, thisMaxLevel - levels), levels, thisMaxLevel);
}
}
function setPointsRight(node, point, levels, thisMaxLevel) {
++levels;
node.nodeLevel = levels;
node.nodePoint = point;
if (node.LeftNode != null) {
setPointsRight(node.LeftNode, point - Math.pow(2, thisMaxLevel - levels), levels, thisMaxLevel);
}
if (node.RightNode != null) {
setPointsRight(node.RightNode, point + Math.pow(2, thisMaxLevel - levels), levels, thisMaxLevel);
}
}
var stepRemark = {
"insertCaseA1": {
"title": "插入节点情况A1",
"remark": [
"当前节点的父节点是红色，且当前节点的祖父节点的另一个子节点（叔叔节点）也是红色"
]
},
"insertSolutionA1": {
"title": "插入节点情况A1的解决方案",
"remark": [
"(01) 将“父节点”设为黑色",
"(02) 将“叔叔节点”设为黑色",
"(03) 将“祖父节点”设为“红色",
"(04) 将“祖父节点”设为“当前节点”(红色节点)；即，之后继续对“当前节点”进行操作"
]
},
"insertCaseB1": {
"title": "插入节点情况2",
"remark": [
"当前节点的父节点是红色，叔叔节点是黑色，且当前节点是其父节点的右孩子"
]
},
"insertSolutionB1": {
"title": "插入节点情况2的解决方案",
"remark": [
"(01) 将“父节点”作为“新的当前节点”",
"(02) 以“新的当前节点”为支点进行左旋",
]
},
"insertCase3": {
"title": "插入节点情况3",
"remark": [
"当前节点的父节点是红色，叔叔节点是黑色，且当前节点是其父节点的左孩子"
]
},
"insertSolution3": {
"title": "插入节点情况3的解决方案",
"remark": [
"(01) 将“父节点”设为“黑色”",
"(02) 将“祖父节点”设为“红色”",
"(03) 以“祖父节点”为支点进行右旋"
]
},
"insertCase4": {
"title": "插入节点情况4",
"remark": [
"当前节点的父节点是红色，叔叔节点是黑色，且当前节点是其父节点的左孩子"
]
},
"insertSolution4": {
"title": "插入节点情况4的解决方案",
"remark": [
"(01) 将“父节点”作为“新的当前节点”",
"(02) 以“新的当前节点”为支点进行右旋",
]
},
"insertCase5": {
"title": "插入节点情况5",
"remark": [
"当前节点的父节点是红色，叔叔节点是黑色，且当前节点是其父节点的右孩子"
]
},
"insertSolution5": {
"title": "插入节点情况5的解决方案",
"remark": [
"(01) 将“父节点”设为“黑色”",
"(02) 将“祖父节点”设为“红色”",
"(03) 以“祖父节点”为支点进行左旋"
]
},
"deleteCase1": {
"title": "删除节点情况1",
"remark": [
"被删节点是“黑+黑”节点，被删除的节点是左节点，被删节点的兄弟节点是红色。(此时被删节点的父节点和x的兄弟节点的子节点都是黑节点)。"
]
},
"deleteSolution1": {
"title": "删除节点情况1解决方案",
"remark": [
"(01) 将x的兄弟节点设为“黑色”。",
"(02) 将x的父节点设为“红色”。",
"(03) 对x的父节点进行左旋。",
"(04) 左旋后，重新设置x的兄弟节点。"
]
},
"deleteCase2": {
"title": "删除节点情况2",
"remark": [
"被删节点是“黑+黑”节点，被删除的节点是右节点，被删节点的兄弟节点是红色。(此时被删节点的父节点和x的兄弟节点的子节点都是黑节点)。"
]
},
"deleteSolution2": {
"title": "删除节点情况2解决方案",
"remark": [
"(01) 将被删节点的兄弟节点设为“黑色”。",
"(02) 将被删节点的父节点设为“红色”。",
"(03) 对被删节点的父节点进行右旋。",
"(04) 右旋后，重新设置x的兄弟节点。"
]
},
"deleteCase3": {
"title": "删除节点情况3",
"remark": [
"被删节点是“黑+黑”节点，被删节点的兄弟节点是黑色，被删节点的兄弟节点的两个孩子都是黑色。"
]
},
"deleteSolution3": {
"title": "删除节点情况3解决方案",
"remark": [
"(01) 将被删节点的兄弟节点设为“红色”。",
"(02) 设置“被删节点的父节点”为“新的被删节点节点”。"
]
},
"deleteCase4": {
"title": "删除节点情况4",
"remark": [
"将被删节点是“黑+黑”节点，被删节点的兄弟节点是黑色；将被删节点的兄弟节点的左孩子是红色，右孩子是黑色的。"
]
},
"deleteSolution4": {
"title": "删除节点情况4解决方案",
"remark": [
"(01) 将被删节点兄弟节点的左孩子设为“黑色”。",
"(02) 将被删节点兄弟节点设为“红色”。",
"(03) 对被删节点的兄弟节点进行右旋。",
"(04) 右旋后，重新设置被删节点的兄弟节点。",
]
},
"deleteCase5": {
"title": "删除节点情况5",
"remark": [
"被删节点是“黑+黑”节点，被删节点的兄弟节点是黑色；被删节点的兄弟节点的左孩子是黑色，右孩子是红色的。"
]
},
"deleteSolution5": {
"title": "删除节点情况5解决方案",
"remark": [
"(01) 将被删节点兄弟节点的右孩子设为“黑色”。",
"(02) 将被删节点兄弟节点设为“红色”。",
"(03) 对被删节点的兄弟节点进行左旋。",
"(04) 左旋后，重新设置被删节点的兄弟节点。",
]
},
"deleteCase6": {
"title": "删除节点情况6",
"remark": [
"被删节点是“黑+黑”节点，被删节点的兄弟节点是黑色；被删节点的兄弟节点的右孩子是红色的，被删节点的兄弟节点的左孩子任意颜色。"
]
},
"deleteSolution6": {
"title": "删除节点情况6解决方案",
"remark": [
"(01) 将被删节点父节点颜色 赋值给 被删节点的兄弟节点。",
"(02) 将被删节点父节点设为“黑色”。",
"(03) 将被删节点兄弟节点的右子节点设为“黑色”。",
"(04) 对被删节点的父节点进行左旋。",
"(05) 设置“被删节点”为“根节点”。"
]
},
"deleteCase7": {
"title": "删除节点情况7",
"remark": [
"被删节点是“黑+黑”节点，被删节点的兄弟节点是黑色；被删节点的兄弟节点的左孩子是红色的，被删节点的兄弟节点的右孩子任意颜色。"
]
},
"deleteSolution7": {
"title": "删除节点情况7解决方案",
"remark": [
"(01) 将被删节点父节点颜色 赋值给 被删节点的兄弟节点。",
"(02) 将被删节点父节点设为“黑色”。",
"(03) 将被删节点兄弟节点的左子节设为“黑色”。",
"(04) 对被删节点的父节点进行右旋。",
"(05) 设置“被删节点”为“根节点”。"
]
},
"deleteCase8": {
"title": "删除节点情况8",
"remark": [
"被删节点有两个子节点"
]
},
"deleteSolution8": {
"title": "删除节点情况8解决方案",
"remark": [
"(01) 将被删节点右节点的子孙节点中找出小的节点，替换被删节点。",
]
},
"deleteCase9": {
"title": "删除节点情况9",
"remark": [
"被删节点只有一个子节点或无子节点"
]
},
"deleteSolution9": {
"title": "删除节点情况9解决方案",
"remark": [
"(01) 将唯一的子节点替换被删节点。",
]
}
};
function ClearStepView() {
var stepView = document.getElementById("stepView");
stepView.innerHTML = '';
}
function CreateStepView(_tree, step, currentNumber) {
var fieldset = document.createElement("fieldset");
var legend = document.createElement("legend");
var ul = document.createElement("ul");
var canvas = document.createElement("canvas");
legend.innerHTML = stepRemark[step].title;
if (!!currentNumber) {
var li = document.createElement("li");
li.innerHTML = "当前节点：" + currentNumber;
ul.appendChild(li);
}
for (var i = 0; i < stepRemark[step].remark.length; i++) {
var li = document.createElement("li");
li.innerHTML = stepRemark[step].remark[i];
ul.appendChild(li);
}
fieldset.appendChild(legend);
fieldset.appendChild(ul);
fieldset.appendChild(canvas);
var stepView = document.getElementById("stepView");
stepView.appendChild(fieldset);
CreateStepTreeView(_tree, canvas);
}
function CreateStepTreeView(rootNode, canvas) {
var size = SetCanvasWidthHeight(rootNode);
canvas.style.backgroundColor = "antiquewhite";
canvas.style.display = "block";
canvas.height = size.height;
canvas.width = size.width;
var context = canvas.getContext("2d");
SetPoint(rootNode);
PreOrder(rootNode, SetPreOrder, context, canvas.width);
}
</script>
</body>
</html>
