1502 行
39 KiB
JavaScript
1502 行
39 KiB
JavaScript
// Copyright 2011 David Galles, University of San Francisco. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other materials
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// provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// The views and conclusions contained in the software and documentation are those of the
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// authors and should not be interpreted as representing official policies, either expressed
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// or implied, of the University of San Francisco
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function RedBlack(am, w, h)
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{
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this.init(am, w, h);
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}
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RedBlack.prototype = new Algorithm();
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RedBlack.prototype.constructor = RedBlack;
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RedBlack.superclass = Algorithm.prototype;
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RedBlack.prototype.init = function(am, w, h)
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{
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var sc = RedBlack.superclass;
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var fn = sc.init;
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fn.call(this,am);
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this.addControls();
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this.nextIndex = 1;
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this.commands = [];
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this.startingX = w / 2;
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this.print_max = w - PRINT_HORIZONTAL_GAP;
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this.first_print_pos_y = h - 2 * PRINT_VERTICAL_GAP;
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this.cmd("CreateLabel", 0, "", EXPLANITORY_TEXT_X, EXPLANITORY_TEXT_Y, 0);
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this.animationManager.StartNewAnimation(this.commands);
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this.animationManager.skipForward();
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this.animationManager.clearHistory();
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}
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RedBlack.prototype.addControls = function()
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{
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this.insertField = addControlToAlgorithmBar("Text", "");
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this.insertField.onkeydown = this.returnSubmit(this.insertField, this.insertCallback.bind(this), 4);
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this.insertButton = addControlToAlgorithmBar("Button", "添加");
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this.insertButton.onclick = this.insertCallback.bind(this);
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this.deleteField = addControlToAlgorithmBar("Text", "");
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this.deleteField.onkeydown = this.returnSubmit(this.deleteField, this.deleteCallback.bind(this), 4);
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this.deleteButton = addControlToAlgorithmBar("Button", "删除");
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this.deleteButton.onclick = this.deleteCallback.bind(this);
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this.findField = addControlToAlgorithmBar("Text", "");
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this.findField.onkeydown = this.returnSubmit(this.findField, this.findCallback.bind(this), 4);
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this.findButton = addControlToAlgorithmBar("Button", "搜索");
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this.findButton.onclick = this.findCallback.bind(this);
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this.printButton = addControlToAlgorithmBar("Button", "打印");
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this.printButton.onclick = this.printCallback.bind(this);
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this.showNullLeaves = addCheckboxToAlgorithmBar("显示null叶子节点");
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this.showNullLeaves.onclick = this.showNullLeavesCallback.bind(this);
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this.showNullLeaves.checked = false;;
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}
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RedBlack.prototype.reset = function()
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{
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this.nextIndex = 1;
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this.treeRoot = null;
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}
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var FIRST_PRINT_POS_X = 50;
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var PRINT_VERTICAL_GAP = 20;
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var PRINT_HORIZONTAL_GAP = 50;
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var FOREGROUND_RED = "#ffffff";
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var BACKGROUND_RED = "#ff0000";
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var FOREGROUND_BLACK = "#ffffff"
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var BACKGROUND_BLACK = "#000000";
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var BACKGROUND_DOUBLE_BLACK = "#777777";
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// var HIGHLIGHT_LABEL_COLOR = RED
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// var HIGHLIGHT_LINK_COLOR = RED
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var HIGHLIGHT_LABEL_COLOR = "#FF0000"
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var HIGHLIGHT_LINK_COLOR = "#FF0000"
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var BLUE = "#0000FF";
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var LINK_COLOR = "#000000"
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var BACKGROUND_COLOR = BACKGROUND_BLACK;
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var HIGHLIGHT_COLOR = "#007700";
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var FOREGROUND_COLOR = FOREGROUND_BLACK;
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var PRINT_COLOR = FOREGROUND_COLOR
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var widthDelta = 50;
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var heightDelta = 50;
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var startingY = 50;
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var FIRST_PRINT_POS_X = 40;
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var PRINT_VERTICAL_GAP = 20;
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var PRINT_HORIZONTAL_GAP = 50;
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var EXPLANITORY_TEXT_X = 10;
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var EXPLANITORY_TEXT_Y = 10;
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RedBlack.prototype.insertCallback = function(event)
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{
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var insertedValue = this.insertField.value;
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// Get text value
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insertedValue = this.normalizeNumber(insertedValue, 4);
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if (insertedValue != "")
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{
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// set text value
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this.insertField.value = "";
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this.implementAction(this.insertElement.bind(this), insertedValue);
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}
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}
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RedBlack.prototype.deleteCallback = function(event)
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{
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var deletedValue = this.deleteField.value;
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if (deletedValue != "")
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{
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deletedValue = this.normalizeNumber(deletedValue, 4);
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this.deleteField.value = "";
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this.implementAction(this.deleteElement.bind(this),deletedValue);
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}
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}
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RedBlack.prototype.findCallback = function(event)
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{
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var findValue = this.findField.value;
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if (findValue != "")
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{
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findValue = this.normalizeNumber(findValue, 4);
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this.findField.value = "";
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this.implementAction(this.findElement.bind(this),findValue);
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}
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}
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RedBlack.prototype.printCallback = function(event)
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{
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this.implementAction(this.printTree.bind(this),"");
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}
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RedBlack.prototype.showNullLeavesCallback = function(event)
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{
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if (this.showNullLeaves.checked)
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{
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this.animationManager.setAllLayers([0,1]);
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}
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else
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{
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this.animationManager.setAllLayers([0]);
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}
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}
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RedBlack.prototype.printTree = function(unused)
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{
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this.commands = [];
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if (this.treeRoot != null)
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{
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this.highlightID = this.nextIndex++;
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var firstLabel = this.nextIndex;
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this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, this.treeRoot.x, this.treeRoot.y);
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this.xPosOfNextLabel = FIRST_PRINT_POS_X;
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this.yPosOfNextLabel = this.first_print_pos_y;
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this.printTreeRec(this.treeRoot);
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this.cmd("Delete",this.highlightID);
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this.cmd("Step");
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for (var i = firstLabel; i < this.nextIndex; i++)
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this.cmd("Delete", i);
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this.nextIndex = this.highlightID; /// Reuse objects. Not necessary.
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}
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return this.commands;
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}
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RedBlack.prototype.printTreeRec = function(tree)
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{
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this.cmd("Step");
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if (tree.left != null && !tree.left.phantomLeaf)
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{
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this.cmd("Move", this.highlightID, tree.left.x, tree.left.y);
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this.printTreeRec(tree.left);
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this.cmd("Move", this.highlightID, tree.x, tree.y);
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this.cmd("Step");
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}
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var nextLabelID = this.nextIndex++;
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this.cmd("CreateLabel", nextLabelID, tree.data, tree.x, tree.y);
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this.cmd("SetForegroundColor", nextLabelID, PRINT_COLOR);
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this.cmd("Move", nextLabelID, this.xPosOfNextLabel, this.yPosOfNextLabel);
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this.cmd("Step");
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this.xPosOfNextLabel += PRINT_HORIZONTAL_GAP;
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if (this.xPosOfNextLabel > this.print_max)
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{
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this.xPosOfNextLabel = FIRST_PRINT_POS_X;
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this.yPosOfNextLabel += PRINT_VERTICAL_GAP;
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}
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if (tree.right != null && !tree.right.phantomLeaf)
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{
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this.cmd("Move", this.highlightID, tree.right.x, tree.right.y);
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this.printTreeRec(tree.right);
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this.cmd("Move", this.highlightID, tree.x, tree.y);
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this.cmd("Step");
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}
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return;
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}
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RedBlack.prototype.findElement = function(findValue)
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{
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this.commands = [];
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this.highlightID = this.nextIndex++;
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this.doFind(this.treeRoot, findValue);
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return this.commands;
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}
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RedBlack.prototype.doFind = function(tree, value)
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{
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this.cmd("SetText", 0, "Searchiing for "+value);
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if (tree != null && !tree.phantomLeaf)
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{
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this.cmd("SetHighlight", tree.graphicID, 1);
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if (tree.data == value)
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{
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this.cmd("SetText", 0, "正在搜索 "+value+"：" + value + " = " + value + " (Element found!)");
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this.cmd("Step");
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this.cmd("SetText", 0, "Found:"+value);
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this.cmd("SetHighlight", tree.graphicID, 0);
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}
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else
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{
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if (tree.data > value)
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{
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this.cmd("SetText", 0, "正在搜索 "+value+"：" + value + " < " + tree.data + " （访问左子树）");
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this.cmd("Step");
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this.cmd("SetHighlight", tree.graphicID, 0);
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if (tree.left!= null)
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{
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this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, tree.x, tree.y);
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this.cmd("Move", this.highlightID, tree.left.x, tree.left.y);
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this.cmd("Step");
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this.cmd("Delete", this.highlightID);
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}
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this.doFind(tree.left, value);
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}
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else
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{
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this.cmd("SetText", 0, " 正在搜索 "+value+"：" + value + " > " + tree.data + " （访问右子树）");
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this.cmd("Step");
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this.cmd("SetHighlight", tree.graphicID, 0);
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if (tree.right!= null)
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{
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this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, tree.x, tree.y);
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this.cmd("Move", this.highlightID, tree.right.x, tree.right.y);
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this.cmd("Step");
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this.cmd("Delete", this.highlightID);
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}
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this.doFind(tree.right, value);
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}
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}
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}
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else
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{
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this.cmd("SetText", 0, " 正在搜索 "+value+"：" + "< 空树 > (找不到元素)");
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this.cmd("Step");
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this.cmd("SetText", 0, " 正在搜索 "+value+"：" + " (找不到元素)");
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}
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}
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RedBlack.prototype.findUncle = function(tree)
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{
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if (tree.parent == null)
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{
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return null;
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}
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var par = tree.parent;
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if (par.parent == null)
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{
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return null;
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}
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var grandPar = par.parent;
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if (grandPar.left == par)
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{
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return grandPar.right;
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}
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else
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{
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return grandPar.left;
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}
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}
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RedBlack.prototype.blackLevel = function(tree)
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{
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if (tree == null)
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{
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return 1;
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}
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else
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{
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return tree.blackLevel;
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}
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}
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RedBlack.prototype.attachLeftNullLeaf = function(node)
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{
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// Add phantom left leaf
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var treeNodeID = this.nextIndex++;
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this.cmd("CreateCircle", treeNodeID, "null", node.x, node.y);
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this.cmd("SetForegroundColor", treeNodeID, FOREGROUND_BLACK);
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this.cmd("SetBackgroundColor", treeNodeID, BACKGROUND_BLACK);
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node.left = new RedBlackNode("", treeNodeID, this.startingX, startingY);
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node.left.phantomLeaf = true;
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this.cmd("SetLayer", treeNodeID, 1);
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node.left.blackLevel = 1;
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this.cmd("Connect",node.graphicID, treeNodeID, LINK_COLOR);
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}
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RedBlack.prototype.attachRightNullLeaf = function(node)
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{
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// Add phantom right leaf
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treeNodeID = this.nextIndex++;
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this.cmd("CreateCircle", treeNodeID, "null", node.x, node.y);
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this.cmd("SetForegroundColor", treeNodeID, FOREGROUND_BLACK);
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this.cmd("SetBackgroundColor", treeNodeID, BACKGROUND_BLACK);
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node.right = new RedBlackNode("", treeNodeID, this.startingX, startingY);
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this.cmd("SetLayer", treeNodeID, 1);
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node.right.phantomLeaf = true;
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node.right.blackLevel = 1;
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this.cmd("Connect", node.graphicID, treeNodeID, LINK_COLOR);
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}
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RedBlack.prototype.attachNullLeaves = function(node)
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{
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this.attachLeftNullLeaf(node);
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this.attachRightNullLeaf(node);
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}
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RedBlack.prototype.insertElement = function(insertedValue)
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{
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this.commands = new Array();
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this.cmd("SetText", 0, " 正在添加 "+insertedValue);
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this.highlightID = this.nextIndex++;
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var treeNodeID;
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if (this.treeRoot == null)
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{
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treeNodeID = this.nextIndex++;
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this.cmd("CreateCircle", treeNodeID, insertedValue, this.startingX, startingY);
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this.cmd("SetForegroundColor", treeNodeID, FOREGROUND_BLACK);
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this.cmd("SetBackgroundColor", treeNodeID, BACKGROUND_BLACK);
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this.treeRoot = new RedBlackNode(insertedValue, treeNodeID, this.startingX, startingY);
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this.treeRoot.blackLevel = 1;
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this.attachNullLeaves(this.treeRoot);
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this.resizeTree();
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}
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else
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{
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treeNodeID = this.nextIndex++;
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this.cmd("CreateCircle", treeNodeID, insertedValue, 30, startingY);
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this.cmd("SetForegroundColor", treeNodeID, FOREGROUND_RED);
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this.cmd("SetBackgroundColor", treeNodeID, BACKGROUND_RED);
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this.cmd("Step");
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var insertElem = new RedBlackNode(insertedValue, treeNodeID, 100, 100)
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this.cmd("SetHighlight", insertElem.graphicID, 1);
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insertElem.height = 1;
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this.insert(insertElem, this.treeRoot);
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// resizeTree();
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}
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this.cmd("SetText", 0, " ");
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return this.commands;
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}
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RedBlack.prototype.singleRotateRight = function(tree)
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{
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var B = tree;
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var t3 = B.right;
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var A = tree.left;
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var t1 = A.left;
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var t2 = A.right;
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this.cmd("SetText", 0, "右单旋");
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this.cmd("SetEdgeHighlight", B.graphicID, A.graphicID, 1);
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this.cmd("Step");
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// TODO: Change link color
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if (t2 != null)
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{
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this.cmd("Disconnect", A.graphicID, t2.graphicID);
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this.cmd("Connect", B.graphicID, t2.graphicID, LINK_COLOR);
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t2.parent = B;
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}
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this.cmd("Disconnect", B.graphicID, A.graphicID);
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this.cmd("Connect", A.graphicID, B.graphicID, LINK_COLOR);
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A.parent = B.parent;
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if (this.treeRoot == B)
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{
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this.treeRoot = A;
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}
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else
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{
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this.cmd("Disconnect", B.parent.graphicID, B.graphicID, LINK_COLOR);
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this.cmd("Connect", B.parent.graphicID, A.graphicID, LINK_COLOR)
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if (B.isLeftChild())
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{
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B.parent.left = A;
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}
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else
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{
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B.parent.right = A;
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}
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}
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A.right = B;
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B.parent = A;
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B.left = t2;
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this.resetHeight(B);
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this.resetHeight(A);
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this.resizeTree();
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return A;
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}
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RedBlack.prototype.singleRotateLeft = function(tree)
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{
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var A = tree;
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var B = tree.right;
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var t1 = A.left;
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var t2 = B.left;
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var t3 = B.right;
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this.cmd("SetText", 0, "左单旋");
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this.cmd("SetEdgeHighlight", A.graphicID, B.graphicID, 1);
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this.cmd("Step");
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if (t2 != null)
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{
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this.cmd("Disconnect", B.graphicID, t2.graphicID);
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this.cmd("Connect", A.graphicID, t2.graphicID, LINK_COLOR);
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t2.parent = A;
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}
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this.cmd("Disconnect", A.graphicID, B.graphicID);
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this.cmd("Connect", B.graphicID, A.graphicID, LINK_COLOR);
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B.parent = A.parent;
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if (this.treeRoot == A)
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{
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this.treeRoot = B;
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}
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else
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{
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this.cmd("Disconnect", A.parent.graphicID, A.graphicID, LINK_COLOR);
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this.cmd("Connect", A.parent.graphicID, B.graphicID, LINK_COLOR)
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if (A.isLeftChild())
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{
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A.parent.left = B;
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}
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else
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{
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A.parent.right = B;
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}
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}
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B.left = A;
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A.parent = B;
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A.right = t2;
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this.resetHeight(A);
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this.resetHeight(B);
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this.resizeTree();
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return B;
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|
}
|
|
|
|
|
|
|
|
|
|
RedBlack.prototype.getHeight = function(tree)
|
|
{
|
|
if (tree == null)
|
|
{
|
|
return 0;
|
|
}
|
|
return tree.height;
|
|
}
|
|
|
|
RedBlack.prototype.resetHeight = function(tree)
|
|
{
|
|
if (tree != null)
|
|
{
|
|
var newHeight = Math.max(this.getHeight(tree.left), this.getHeight(tree.right)) + 1;
|
|
if (tree.height != newHeight)
|
|
{
|
|
tree.height = Math.max(this.getHeight(tree.left), this.getHeight(tree.right)) + 1
|
|
}
|
|
}
|
|
}
|
|
|
|
RedBlack.prototype.insert = function(elem, tree)
|
|
{
|
|
this.cmd("SetHighlight", tree.graphicID, 1);
|
|
this.cmd("SetHighlight", elem.graphicID, 1);
|
|
|
|
if (elem.data < tree.data)
|
|
{
|
|
this.cmd("SetText", 0, elem.data + " < " + tree.data + "， 访问左子树");
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, elem.data + " >= " + tree.data + "， 访问右子树");
|
|
}
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", tree.graphicID , 0);
|
|
this.cmd("SetHighlight", elem.graphicID, 0);
|
|
|
|
if (elem.data < tree.data)
|
|
{
|
|
if (tree.left == null || tree.left.phantomLeaf)
|
|
{
|
|
this.cmd("SetText", 0, "Found null tree (or phantom leaf), inserting element");
|
|
if (tree.left != null)
|
|
{
|
|
this.cmd("Delete", tree.left.graphicID);
|
|
}
|
|
this.cmd("SetHighlight", elem.graphicID, 0);
|
|
tree.left=elem;
|
|
elem.parent = tree;
|
|
this.cmd("Connect", tree.graphicID, elem.graphicID, LINK_COLOR);
|
|
|
|
this.attachNullLeaves(elem);
|
|
this.resizeTree();
|
|
|
|
|
|
|
|
|
|
this.resizeTree();
|
|
|
|
this.fixDoubleRed(elem);
|
|
|
|
}
|
|
else
|
|
{
|
|
this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, tree.x, tree.y);
|
|
this.cmd("Move", this.highlightID, tree.left.x, tree.left.y);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", this.highlightID);
|
|
this.insert(elem, tree.left);
|
|
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (tree.right == null || tree.right.phantomLeaf)
|
|
{
|
|
this.cmd("SetText", 0, "Found null tree (or phantom leaf), inserting element");
|
|
if (tree.right != null)
|
|
{
|
|
this.cmd("Delete", tree.right.graphicID);
|
|
}
|
|
|
|
this.cmd("SetHighlight", elem.graphicID, 0);
|
|
tree.right=elem;
|
|
elem.parent = tree;
|
|
this.cmd("Connect", tree.graphicID, elem.graphicID, LINK_COLOR);
|
|
elem.x = tree.x + widthDelta/2;
|
|
elem.y = tree.y + heightDelta
|
|
this.cmd("Move", elem.graphicID, elem.x, elem.y);
|
|
|
|
|
|
this.attachNullLeaves(elem);
|
|
this.resizeTree();
|
|
|
|
|
|
this.resizeTree();
|
|
this.fixDoubleRed(elem);
|
|
}
|
|
else
|
|
{
|
|
this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, tree.x, tree.y);
|
|
this.cmd("Move", this.highlightID, tree.right.x, tree.right.y);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", this.highlightID);
|
|
this.insert(elem, tree.right);
|
|
}
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
RedBlack.prototype.fixDoubleRed = function(tree)
|
|
{
|
|
if (tree.parent != null)
|
|
{
|
|
if (tree.parent.blackLevel > 0)
|
|
{
|
|
return;
|
|
}
|
|
if (tree.parent.parent == null)
|
|
{
|
|
this.cmd("SetText", 0, "Tree root is red, color it black.");
|
|
this.cmd("Step");
|
|
tree.parent.blackLevel = 1;
|
|
this.cmd("SetForegroundColor", tree.parent.graphicID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor", tree.parent.graphicID, BACKGROUND_BLACK);
|
|
return;
|
|
}
|
|
var uncle = this.findUncle(tree);
|
|
if (this.blackLevel(uncle) == 0)
|
|
{
|
|
this.cmd("SetText", 0, "Node and parent are both red. Uncle of node is red -- push blackness down from grandparent");
|
|
this.cmd("Step");
|
|
|
|
this.cmd("SetForegroundColor", uncle.graphicID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor",uncle.graphicID, BACKGROUND_BLACK);
|
|
uncle.blackLevel = 1;
|
|
|
|
tree.parent.blackLevel = 1;
|
|
this.cmd("SetForegroundColor", tree.parent.graphicID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor",tree.parent.graphicID, BACKGROUND_BLACK);
|
|
|
|
tree.parent.parent.blackLevel = 0;
|
|
this.cmd("SetForegroundColor", tree.parent.parent.graphicID, FOREGROUND_RED);
|
|
this.cmd("SetBackgroundColor",tree.parent.parent.graphicID, BACKGROUND_RED);
|
|
this.cmd("Step");
|
|
this.fixDoubleRed(tree.parent.parent);
|
|
}
|
|
else
|
|
{
|
|
if (tree.isLeftChild() && !tree.parent.isLeftChild())
|
|
{
|
|
this.cmd("SetText", 0, "Node and parent are both red. Node is left child, parent is right child -- rotate");
|
|
this.cmd("Step");
|
|
|
|
this.singleRotateRight(tree.parent);
|
|
tree=tree.right;
|
|
|
|
}
|
|
else if (!tree.isLeftChild() && tree.parent.isLeftChild())
|
|
{
|
|
this.cmd("SetText", 0, "Node and parent are both red. Node is right child, parent is left child -- rotate");
|
|
this.cmd("Step");
|
|
|
|
this.singleRotateLeft(tree.parent);
|
|
tree=tree.left;
|
|
}
|
|
|
|
if (tree.isLeftChild())
|
|
{
|
|
this.cmd("SetText", 0, "Node and parent are both red. Node is left child, parent is left child\nCan fix extra redness with a single rotation");
|
|
this.cmd("Step");
|
|
|
|
this.singleRotateRight(tree.parent.parent);
|
|
tree.parent.blackLevel = 1;
|
|
this.cmd("SetForegroundColor", tree.parent.graphicID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor",tree.parent.graphicID, BACKGROUND_BLACK);
|
|
|
|
tree.parent.right.blackLevel = 0;
|
|
this.cmd("SetForegroundColor", tree.parent.right.graphicID, FOREGROUND_RED);
|
|
this.cmd("SetBackgroundColor",tree.parent.right.graphicID, BACKGROUND_RED);
|
|
|
|
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "Node and parent are both red. Node is right child, parent is right child\nCan fix extra redness with a single rotation");
|
|
this.cmd("Step");
|
|
|
|
this.singleRotateLeft(tree.parent.parent);
|
|
tree.parent.blackLevel = 1;
|
|
this.cmd("SetForegroundColor", tree.parent.graphicID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor",tree.parent.graphicID, BACKGROUND_BLACK);
|
|
|
|
tree.parent.left.blackLevel = 0;
|
|
this.cmd("SetForegroundColor", tree.parent.left.graphicID, FOREGROUND_RED);
|
|
this.cmd("SetBackgroundColor",tree.parent.left.graphicID, BACKGROUND_RED);
|
|
|
|
}
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
if (tree.blackLevel == 0)
|
|
{
|
|
this.cmd("SetText", 0, "Root of the tree is red. Color it black");
|
|
this.cmd("Step");
|
|
|
|
tree.blackLevel = 1;
|
|
this.cmd("SetForegroundColor", tree.graphicID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor", tree.graphicID, BACKGROUND_BLACK);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
RedBlack.prototype.deleteElement = function(deletedValue)
|
|
{
|
|
this.commands = new Array();
|
|
this.cmd("SetText", 0, "正在刪除 "+deletedValue);
|
|
this.cmd("Step");
|
|
this.cmd("SetText", 0, " ");
|
|
this.highlightID = this.nextIndex++;
|
|
this.treeDelete(this.treeRoot, deletedValue);
|
|
this.cmd("SetText", 0, " ");
|
|
// Do delete
|
|
return this.commands;
|
|
}
|
|
|
|
|
|
RedBlack.prototype.fixLeftNull = function(tree)
|
|
{
|
|
var treeNodeID = this.nextIndex++;
|
|
var nullLeaf;
|
|
this.cmd("SetText", 0, "Coloring 'Null Leaf' double black");
|
|
|
|
this.cmd("CreateCircle", treeNodeID, "null", tree.x, tree.y);
|
|
this.cmd("SetForegroundColor", treeNodeID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor", treeNodeID, BACKGROUND_DOUBLE_BLACK);
|
|
nullLeaf = new RedBlackNode("null", treeNodeID, tree.x, tree.x);
|
|
nullLeaf.blackLevel = 2;
|
|
nullLeaf.parent = tree;
|
|
nullLeaf.phantomLeaf = true;
|
|
tree.left = nullLeaf;
|
|
this.cmd("Connect", tree.graphicID, nullLeaf.graphicID, LINK_COLOR);
|
|
|
|
this.resizeTree();
|
|
this.fixExtraBlackChild(tree, true);
|
|
this.cmd("SetLayer", nullLeaf.graphicID, 1);
|
|
nullLeaf.blackLevel = 1;
|
|
this.fixNodeColor(nullLeaf);
|
|
}
|
|
|
|
|
|
RedBlack.prototype.fixRightNull = function(tree)
|
|
{
|
|
var treeNodeID = this.nextIndex++;
|
|
var nullLeaf;
|
|
this.cmd("SetText", 0, "Coloring 'Null Leaf' double black");
|
|
|
|
this.cmd("CreateCircle", treeNodeID, "null", tree.x, tree.y);
|
|
this.cmd("SetForegroundColor", treeNodeID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor", treeNodeID, BACKGROUND_DOUBLE_BLACK);
|
|
nullLeaf = new RedBlackNode("null", treeNodeID, tree.x, tree.x);
|
|
nullLeaf.parent = tree;
|
|
nullLeaf.phantomLeaf = true;
|
|
nullLeaf.blackLevel = 2;
|
|
tree.right = nullLeaf;
|
|
this.cmd("Connect", tree.graphicID, nullLeaf.graphicID, LINK_COLOR);
|
|
|
|
this.resizeTree();
|
|
|
|
this.fixExtraBlackChild(tree, false);
|
|
|
|
this.cmd("SetLayer", nullLeaf.graphicID, 1);
|
|
nullLeaf.blackLevel = 1;
|
|
this.fixNodeColor(nullLeaf);
|
|
|
|
}
|
|
|
|
|
|
RedBlack.prototype.fixExtraBlackChild = function(parNode, isLeftChild)
|
|
{
|
|
var sibling;
|
|
var doubleBlackNode;
|
|
if (isLeftChild)
|
|
{
|
|
sibling = parNode.right;
|
|
doubleBlackNode = parNode.left;
|
|
}
|
|
else
|
|
{
|
|
sibling = parNode.left;
|
|
doubleBlackNode = parNode.right;
|
|
}
|
|
if (this.blackLevel(sibling) > 0 && this.blackLevel(sibling.left) > 0 && this.blackLevel(sibling.right) > 0)
|
|
{
|
|
this.cmd("SetText", 0, "Double black node has black sibling and 2 black nephews. Push up black level");
|
|
this.cmd("Step");
|
|
sibling.blackLevel = 0;
|
|
this.fixNodeColor(sibling);
|
|
if (doubleBlackNode != null)
|
|
{
|
|
doubleBlackNode.blackLevel = 1;
|
|
this.fixNodeColor(doubleBlackNode);
|
|
|
|
}
|
|
if (parNode.blackLevel == 0)
|
|
{
|
|
parNode.blackLevel = 1;
|
|
this.fixNodeColor(parNode);
|
|
}
|
|
else
|
|
{
|
|
parNode.blackLevel = 2;
|
|
this.fixNodeColor(parNode);
|
|
this.cmd("SetText", 0, "Pushing up black level created another double black node. Repeating ...");
|
|
this.cmd("Step");
|
|
this.fixExtraBlack(parNode);
|
|
}
|
|
}
|
|
else if (this.blackLevel(sibling) == 0)
|
|
{
|
|
this.cmd("SetText", 0, "Double black node has red sibling. Rotate tree to make sibling black ...");
|
|
this.cmd("Step");
|
|
if (isLeftChild)
|
|
{
|
|
var newPar = this.singleRotateLeft(parNode);
|
|
newPar.blackLevel = 1;
|
|
this.fixNodeColor(newPar);
|
|
newPar.left.blackLevel = 0;
|
|
this.fixNodeColor(newPar.left);
|
|
this.cmd("Step"); // TODO: REMOVE
|
|
this.fixExtraBlack(newPar.left.left);
|
|
|
|
}
|
|
else
|
|
{
|
|
newPar = this.singleRotateRight(parNode);
|
|
newPar.blackLevel = 1;
|
|
this.fixNodeColor(newPar);
|
|
newPar.right.blackLevel = 0;
|
|
this.fixNodeColor(newPar.right);
|
|
this.cmd("Step"); // TODO: REMOVE
|
|
|
|
this.fixExtraBlack(newPar.right.right);
|
|
}
|
|
}
|
|
else if (isLeftChild && this.blackLevel(sibling.right) > 0)
|
|
{
|
|
this.cmd("SetText", 0, "Double black node has black sibling, but double black node is a left child, \nand the right nephew is black. Rotate tree to make opposite nephew red ...");
|
|
this.cmd("Step");
|
|
|
|
var newSib = this.singleRotateRight(sibling);
|
|
newSib.blackLevel = 1;
|
|
this.fixNodeColor(newSib);
|
|
newSib.right.blackLevel = 0;
|
|
this.fixNodeColor(newSib.right);
|
|
this.cmd("Step");
|
|
this.fixExtraBlackChild(parNode, isLeftChild);
|
|
}
|
|
else if (!isLeftChild && this.blackLevel(sibling.left) > 0)
|
|
{
|
|
this.cmd("SetText", 0, "Double black node has black sibling, but double black node is a right child, \nand the left nephew is black. Rotate tree to make opposite nephew red ...");
|
|
this.cmd("Step");
|
|
newSib = this.singleRotateLeft(sibling);
|
|
newSib.blackLevel = 1;
|
|
this.fixNodeColor(newSib);
|
|
newSib.left.blackLevel = 0;
|
|
this.fixNodeColor(newSib.left);
|
|
this.cmd("Step");
|
|
this.fixExtraBlackChild(parNode, isLeftChild);
|
|
}
|
|
else if (isLeftChild)
|
|
{
|
|
this.cmd("SetText", 0, "Double black node has black sibling, is a left child, and its right nephew is red.\nOne rotation can fix double-blackness.");
|
|
this.cmd("Step");
|
|
|
|
var oldParBlackLevel = parNode.blackLevel;
|
|
newPar = this.singleRotateLeft(parNode);
|
|
if (oldParBlackLevel == 0)
|
|
{
|
|
newPar.blackLevel = 0;
|
|
this.fixNodeColor(newPar);
|
|
newPar.left.blackLevel = 1;
|
|
this.fixNodeColor(newPar.left);
|
|
}
|
|
newPar.right.blackLevel = 1;
|
|
this.fixNodeColor(newPar.right);
|
|
if (newPar.left.left != null)
|
|
{
|
|
newPar.left.left.blackLevel = 1;
|
|
this.fixNodeColor(newPar.left.left);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "Double black node has black sibling, is a right child, and its left nephew is red.\nOne rotation can fix double-blackness.");
|
|
this.cmd("Step");
|
|
|
|
oldParBlackLevel = parNode.blackLevel;
|
|
newPar = this.singleRotateRight(parNode);
|
|
if (oldParBlackLevel == 0)
|
|
{
|
|
newPar.blackLevel = 0;
|
|
this.fixNodeColor(newPar);
|
|
newPar.right.blackLevel = 1;
|
|
this.fixNodeColor(newPar.right);
|
|
}
|
|
newPar.left.blackLevel = 1;
|
|
this.fixNodeColor(newPar.left);
|
|
if (newPar.right.right != null)
|
|
{
|
|
newPar.right.right.blackLevel = 1;
|
|
this.fixNodeColor(newPar.right.right);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
RedBlack.prototype.fixExtraBlack = function(tree)
|
|
{
|
|
if (tree.blackLevel > 1)
|
|
{
|
|
if (tree.parent == null)
|
|
{
|
|
this.cmd("SetText", 0, "Double black node is root. Make it single black.");
|
|
this.cmd("Step");
|
|
|
|
tree.blackLevel = 1;
|
|
this.cmd("SetBackgroundColor", tree.graphicID, BACKGROUND_BLACK);
|
|
}
|
|
else if (tree.parent.left == tree)
|
|
{
|
|
this.fixExtraBlackChild(tree.parent, true);
|
|
}
|
|
else
|
|
{
|
|
this.fixExtraBlackChild(tree.parent, false);
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
// No extra blackness
|
|
}
|
|
}
|
|
|
|
|
|
|
|
RedBlack.prototype.treeDelete = function(tree, valueToDelete)
|
|
{
|
|
var leftchild = false;
|
|
if (tree != null && !tree.phantomLeaf)
|
|
{
|
|
if (tree.parent != null)
|
|
{
|
|
leftchild = tree.parent.left == tree;
|
|
}
|
|
this.cmd("SetHighlight", tree.graphicID, 1);
|
|
if (valueToDelete < tree.data)
|
|
{
|
|
this.cmd("SetText", 0, valueToDelete + " < " + tree.data + "， 访问左子树");
|
|
}
|
|
else if (valueToDelete > tree.data)
|
|
{
|
|
this.cmd("SetText", 0, valueToDelete + " > " + tree.data + "， 访问右子树");
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, valueToDelete + " == " + tree.data + ". Found node to delete");
|
|
}
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", tree.graphicID, 0);
|
|
|
|
if (valueToDelete == tree.data)
|
|
{
|
|
var needFix = tree.blackLevel > 0;
|
|
if (((tree.left == null) || tree.left.phantomLeaf) && ((tree.right == null) || tree.right.phantomLeaf))
|
|
{
|
|
this.cmd("SetText", 0, "需要删除的是叶子节点，直接删除！");
|
|
this.cmd("Delete", tree.graphicID);
|
|
|
|
if (tree.left != null)
|
|
{
|
|
this.cmd("Delete", tree.left.graphicID);
|
|
}
|
|
if (tree.right != null)
|
|
{
|
|
this.cmd("Delete", tree.right.graphicID);
|
|
}
|
|
|
|
|
|
if (leftchild && tree.parent != null)
|
|
{
|
|
tree.parent.left = null;
|
|
this.resizeTree();
|
|
|
|
if (needFix)
|
|
{
|
|
this.fixLeftNull(tree.parent);
|
|
}
|
|
else
|
|
{
|
|
|
|
this.attachLeftNullLeaf(tree.parent);
|
|
this.resizeTree();
|
|
}
|
|
}
|
|
else if (tree.parent != null)
|
|
{
|
|
tree.parent.right = null;
|
|
this.resizeTree();
|
|
if (needFix)
|
|
{
|
|
this.fixRightNull(tree.parent);
|
|
}
|
|
else
|
|
{
|
|
this.attachRightNullLeaf(tree.parent);
|
|
this.resizeTree();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
this.treeRoot = null;
|
|
}
|
|
|
|
}
|
|
else if (tree.left == null || tree.left.phantomLeaf)
|
|
{
|
|
this.cmd("SetText", 0, "需要删除的节点没有左子树. \nSet parent of deleted node to right child of deleted node.");
|
|
if (tree.left != null)
|
|
{
|
|
this.cmd("Delete", tree.left.graphicID);
|
|
tree.left = null;
|
|
}
|
|
|
|
if (tree.parent != null)
|
|
{
|
|
this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
|
|
this.cmd("Connect", tree.parent.graphicID, tree.right.graphicID, LINK_COLOR);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", tree.graphicID);
|
|
if (leftchild)
|
|
{
|
|
tree.parent.left = tree.right;
|
|
if (needFix)
|
|
{
|
|
this.cmd("SetText", 0, "Back node removed. Increasing child's blackness level");
|
|
tree.parent.left.blackLevel++;
|
|
this.fixNodeColor(tree.parent.left);
|
|
this.fixExtraBlack(tree.parent.left);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tree.parent.right = tree.right;
|
|
if (needFix)
|
|
{
|
|
tree.parent.right.blackLevel++;
|
|
this.cmd("SetText", 0, "Back node removed. Increasing child's blackness level");
|
|
this.fixNodeColor(tree.parent.right);
|
|
this.fixExtraBlack(tree.parent.right);
|
|
}
|
|
|
|
}
|
|
tree.right.parent = tree.parent;
|
|
}
|
|
else
|
|
{
|
|
this.cmd("Delete", tree.graphicID);
|
|
this.treeRoot = tree.right;
|
|
this.treeRoot.parent = null;
|
|
if (this.treeRoot.blackLevel == 0)
|
|
{
|
|
this.treeRoot.blackLevel = 1;
|
|
this.cmd("SetForegroundColor", this.treeRoot.graphicID, FOREGROUND_BLACK);
|
|
this.cmd("SetBackgroundColor", this.treeRoot.graphicID, BACKGROUND_BLACK);
|
|
}
|
|
}
|
|
this.resizeTree();
|
|
}
|
|
else if (tree.right == null || tree.right.phantomLeaf)
|
|
{
|
|
this.cmd("SetText", 0,"需要删除的节点没有右子树. \nSet parent of deleted node to left child of deleted node.");
|
|
if (tree.right != null)
|
|
{
|
|
this.cmd("Delete", tree.right.graphicID);
|
|
tree.right = null;
|
|
}
|
|
if (tree.parent != null)
|
|
{
|
|
this.cmd("Disconnect", tree.parent.graphicID, tree.graphicID);
|
|
this.cmd("Connect", tree.parent.graphicID, tree.left.graphicID, LINK_COLOR);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", tree.graphicID);
|
|
if (leftchild)
|
|
{
|
|
tree.parent.left = tree.left;
|
|
if (needFix)
|
|
{
|
|
tree.parent.left.blackLevel++;
|
|
this.fixNodeColor(tree.parent.left);
|
|
this.fixExtraBlack(tree.parent.left);
|
|
this.resizeTree();
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "删除的是红色节点. 不需要旋转.");
|
|
this.resizeTree();
|
|
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tree.parent.right = tree.left;
|
|
if (needFix)
|
|
{
|
|
tree.parent.right.blackLevel++;
|
|
this.fixNodeColor(tree.parent.right);
|
|
this.fixExtraBlack(tree.parent.left);
|
|
this.resizeTree();
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "删除的是红色节点. 不需要旋转.");
|
|
this.resizeTree();
|
|
}
|
|
}
|
|
tree.left.parent = tree.parent;
|
|
}
|
|
else
|
|
{
|
|
this.cmd("Delete" , tree.graphicID);
|
|
this.treeRoot = tree.left;
|
|
this.treeRoot.parent = null;
|
|
if (this.treeRoot.blackLevel == 0)
|
|
{
|
|
this.treeRoot.blackLevel = 1;
|
|
this.fixNodeColor(this.treeRoot);
|
|
}
|
|
}
|
|
}
|
|
else // tree.left != null && tree.right != null
|
|
{
|
|
this.cmd("SetText", 0, "需要删除的节点有2棵子树. \n找到左子树中最大的节点.");
|
|
|
|
this.highlightID = this.nextIndex;
|
|
this.nextIndex += 1;
|
|
this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, tree.x, tree.y);
|
|
var tmp = tree;
|
|
tmp = tree.left;
|
|
this.cmd("Move", this.highlightID, tmp.x, tmp.y);
|
|
this.cmd("Step");
|
|
while (tmp.right != null && !tmp.right.phantomLeaf)
|
|
{
|
|
tmp = tmp.right;
|
|
this.cmd("Move", this.highlightID, tmp.x, tmp.y);
|
|
this.cmd("Step");
|
|
}
|
|
if (tmp.right != null)
|
|
{
|
|
this.cmd("Delete", tmp.right.graphicID);
|
|
tmp.right = null;
|
|
}
|
|
this.cmd("SetText", tree.graphicID, " ");
|
|
var labelID = this.nextIndex;
|
|
this.nextIndex += 1;
|
|
this.cmd("CreateLabel", labelID, tmp.data, tmp.x, tmp.y);
|
|
this.cmd("SetForegroundColor", labelID, BLUE);
|
|
tree.data = tmp.data;
|
|
this.cmd("Move", labelID, tree.x, tree.y);
|
|
this.cmd("SetText", 0, "Copy largest value of left subtree into node to delete.");
|
|
|
|
this.cmd("Step");
|
|
this.cmd("SetHighlight", tree.graphicID, 0);
|
|
this.cmd("Delete", labelID);
|
|
this.cmd("SetText", tree.graphicID, tree.data);
|
|
this.cmd("Delete", this.highlightID);
|
|
this.cmd("SetText", 0, "Remove node whose value we copied.");
|
|
|
|
needFix = tmp.blackLevel > 0;
|
|
|
|
|
|
if (tmp.left == null)
|
|
{
|
|
this.cmd("Delete", tmp.graphicID);
|
|
if (tmp.parent != tree)
|
|
{
|
|
tmp.parent.right = null;
|
|
this.resizeTree();
|
|
if (needFix)
|
|
{
|
|
this.fixRightNull(tmp.parent);
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "删除的是红色节点. 不需要旋转.");
|
|
this.cmd("Step");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tree.left = null;
|
|
this.resizeTree();
|
|
if (needFix)
|
|
{
|
|
this.fixLeftNull(tmp.parent);
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "删除的是红色节点. 不需要旋转.");
|
|
this.cmd("Step");
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
this.cmd("Disconnect", tmp.parent.graphicID, tmp.graphicID);
|
|
this.cmd("Connect", tmp.parent.graphicID, tmp.left.graphicID, LINK_COLOR);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", tmp.graphicID);
|
|
|
|
if (tmp.parent != tree)
|
|
{
|
|
tmp.parent.right = tmp.left;
|
|
tmp.left.parent = tmp.parent;
|
|
this.resizeTree();
|
|
|
|
if (needFix)
|
|
{
|
|
this.cmd("SetText", 0, "Coloring child of deleted node black");
|
|
this.cmd("Step");
|
|
tmp.left.blackLevel++;
|
|
if (tmp.left.phantomLeaf)
|
|
{
|
|
this.cmd("SetLayer", tmp.left.graphicID, 0);
|
|
}
|
|
this.fixNodeColor(tmp.left);
|
|
this.fixExtraBlack(tmp.left);
|
|
if (tmp.left.phantomLeaf)
|
|
{
|
|
this.cmd("SetLayer", tmp.left.graphicID, 1);
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "删除的是红色节点. 不需要旋转.");
|
|
this.cmd("Step");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tree.left = tmp.left;
|
|
tmp.left.parent = tree;
|
|
this.resizeTree();
|
|
if (needFix)
|
|
{
|
|
this.cmd("SetText", 0, "Coloring child of deleted node black");
|
|
this.cmd("Step");
|
|
tmp.left.blackLevel++;
|
|
if (tmp.left.phantomLeaf)
|
|
{
|
|
this.cmd("SetLayer", tmp.left.graphicID, 0);
|
|
}
|
|
|
|
this.fixNodeColor(tmp.left);
|
|
this.fixExtraBlack(tmp.left);
|
|
if (tmp.left.phantomLeaf)
|
|
{
|
|
this.cmd("SetLayer", tmp.left.graphicID, 1);
|
|
}
|
|
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "删除的是红色节点. 不需要旋转.");
|
|
this.cmd("Step");
|
|
}
|
|
}
|
|
}
|
|
tmp = tmp.parent;
|
|
|
|
}
|
|
}
|
|
else if (valueToDelete < tree.data)
|
|
{
|
|
if (tree.left != null)
|
|
{
|
|
this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, tree.x, tree.y);
|
|
this.cmd("Move", this.highlightID, tree.left.x, tree.left.y);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", this.highlightID);
|
|
}
|
|
this.treeDelete(tree.left, valueToDelete);
|
|
}
|
|
else
|
|
{
|
|
if (tree.right != null)
|
|
{
|
|
this.cmd("CreateHighlightCircle", this.highlightID, HIGHLIGHT_COLOR, tree.x, tree.y);
|
|
this.cmd("Move", this.highlightID, tree.right.x, tree.right.y);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", this.highlightID);
|
|
}
|
|
this.treeDelete(tree.right, valueToDelete);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", 0, "元素 "+valueToDelete+" 未找到, 无法删除");
|
|
}
|
|
|
|
}
|
|
|
|
|
|
RedBlack.prototype.fixNodeColor = function(tree)
|
|
{
|
|
if (tree.blackLevel == 0)
|
|
{
|
|
this.cmd("SetForegroundColor", tree.graphicID, FOREGROUND_RED);
|
|
this.cmd("SetBackgroundColor", tree.graphicID, BACKGROUND_RED);
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetForegroundColor", tree.graphicID, FOREGROUND_BLACK);
|
|
if (tree.blackLevel > 1)
|
|
{
|
|
this.cmd("SetBackgroundColor",tree.graphicID, BACKGROUND_DOUBLE_BLACK);
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetBackgroundColor",tree.graphicID, BACKGROUND_BLACK);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
RedBlack.prototype.resizeTree = function()
|
|
{
|
|
var startingPoint = this.startingX;
|
|
this.resizeWidths(this.treeRoot);
|
|
if (this.treeRoot != null)
|
|
{
|
|
if (this.treeRoot.leftWidth > startingPoint)
|
|
{
|
|
startingPoint = this.treeRoot.leftWidth;
|
|
}
|
|
else if (this.treeRoot.rightWidth > startingPoint)
|
|
{
|
|
startingPoint = Math.max(this.treeRoot.leftWidth, 2 * startingPoint - this.treeRoot.rightWidth);
|
|
}
|
|
this.setNewPositions(this.treeRoot, startingPoint, startingY, 0);
|
|
this.animateNewPositions(this.treeRoot);
|
|
this.cmd("Step");
|
|
}
|
|
|
|
}
|
|
|
|
RedBlack.prototype.setNewPositions = function(tree, xPosition, yPosition, side)
|
|
{
|
|
if (tree != null)
|
|
{
|
|
tree.y = yPosition;
|
|
if (side == -1)
|
|
{
|
|
xPosition = xPosition - tree.rightWidth;
|
|
tree.heightLabelX = xPosition - 20;
|
|
}
|
|
else if (side == 1)
|
|
{
|
|
xPosition = xPosition + tree.leftWidth;
|
|
tree.heightLabelX = xPosition + 20;
|
|
}
|
|
else
|
|
{
|
|
tree.heightLabelX = xPosition - 20;
|
|
}
|
|
tree.x = xPosition;
|
|
tree.heightLabelY = tree.y - 20;
|
|
this.setNewPositions(tree.left, xPosition, yPosition + heightDelta, -1)
|
|
this.setNewPositions(tree.right, xPosition, yPosition + heightDelta, 1)
|
|
}
|
|
|
|
}
|
|
RedBlack.prototype.animateNewPositions = function(tree)
|
|
{
|
|
if (tree != null)
|
|
{
|
|
this.cmd("Move", tree.graphicID, tree.x, tree.y);
|
|
this.animateNewPositions(tree.left);
|
|
this.animateNewPositions(tree.right);
|
|
}
|
|
}
|
|
|
|
RedBlack.prototype.resizeWidths = function(tree)
|
|
{
|
|
if (tree == null)
|
|
{
|
|
return 0;
|
|
}
|
|
tree.leftWidth = Math.max(this.resizeWidths(tree.left), widthDelta / 2);
|
|
tree.rightWidth = Math.max(this.resizeWidths(tree.right), widthDelta / 2);
|
|
return tree.leftWidth + tree.rightWidth;
|
|
}
|
|
|
|
|
|
RedBlack.prototype.disableUI = function(event)
|
|
{
|
|
this.insertField.disabled = true;
|
|
this.insertButton.disabled = true;
|
|
this.deleteField.disabled = true;
|
|
this.deleteButton.disabled = true;
|
|
this.findField.disabled = true;
|
|
this.findButton.disabled = true;
|
|
this.printButton.disabled = true;
|
|
}
|
|
|
|
RedBlack.prototype.enableUI = function(event)
|
|
{
|
|
this.insertField.disabled = false;
|
|
this.insertButton.disabled = false;
|
|
this.deleteField.disabled = false;
|
|
this.deleteButton.disabled = false;
|
|
this.findField.disabled = false;
|
|
this.findButton.disabled = false;
|
|
this.printButton.disabled = false;
|
|
}
|
|
|
|
|
|
/////////////////////////////////////////////////////////
|
|
// Red black node
|
|
////////////////////////////////////////////////////////
|
|
|
|
|
|
function RedBlackNode(val, id, initialX, initialY)
|
|
{
|
|
this.data = val;
|
|
this.x = initialX;
|
|
this.y = initialY;
|
|
this.blackLevel = 0;
|
|
this.phantomLeaf = false;
|
|
this.graphicID = id;
|
|
this.left = null;
|
|
this.right = null;
|
|
this.parent = null;
|
|
this.height = 0;
|
|
this.leftWidth = 0;
|
|
this.rightWidth = 0;
|
|
}
|
|
|
|
RedBlackNode.prototype.isLeftChild = function()
|
|
{
|
|
if (this.parent == null)
|
|
{
|
|
return true;
|
|
}
|
|
return this.parent.left == this;
|
|
}
|
|
|
|
|
|
|
|
/////////////////////////////////////////////////////////
|
|
// Setup stuff
|
|
////////////////////////////////////////////////////////
|
|
|
|
|
|
var currentAlg;
|
|
|
|
function init()
|
|
{
|
|
var animManag = initCanvas();
|
|
currentAlg = new RedBlack(animManag, canvas.width, canvas.height);
|
|
} |