362 行
9.3 KiB
JavaScript
362 行
9.3 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 OpenHash(am, w, h)
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{
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this.init(am, w, h);
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}
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var POINTER_ARRAY_ELEM_WIDTH = 70;
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var POINTER_ARRAY_ELEM_HEIGHT = 30;
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var POINTER_ARRAY_ELEM_START_X = 50;
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var LINKED_ITEM_HEIGHT = 30;
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var LINKED_ITEM_WIDTH = 65;
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var LINKED_ITEM_Y_DELTA = 50;
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var LINKED_ITEM_POINTER_PERCENT = 0.25;
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var MAX_DATA_VALUE = 999;
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var HASH_TABLE_SIZE = 13;
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var ARRAY_Y_POS = 350;
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var INDEX_COLOR = "#0000FF";
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OpenHash.prototype = new Hash();
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OpenHash.prototype.constructor = OpenHash;
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OpenHash.superclass = Hash.prototype;
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OpenHash.prototype.init = function(am, w, h)
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{
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var sc = OpenHash.superclass;
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var fn = sc.init;
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fn.call(this,am, w, h);
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this.nextIndex = 0;
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this.POINTER_ARRAY_ELEM_Y = h - POINTER_ARRAY_ELEM_WIDTH;
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this.setup();
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}
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OpenHash.prototype.addControls = function()
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{
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OpenHash.superclass.addControls.call(this);
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// Add new controls
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}
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OpenHash.prototype.insertElement = function(elem)
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{
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this.commands = new Array();
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this.cmd("SetText", this.ExplainLabel, "Inserting element: " + String(elem));
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var index = this.doHash(elem);
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var node = new LinkedListNode(elem,this.nextIndex++, 100, 75);
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this.cmd("CreateLinkedList", node.graphicID, elem, LINKED_ITEM_WIDTH, LINKED_ITEM_HEIGHT, 100, 75);
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if (this.hashTableValues[index] != null && this.hashTableValues[index] != undefined)
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{
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this.cmd("connect", node.graphicID, this.hashTableValues[index].graphicID);
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this.cmd("disconnect", this.hashTableVisual[index], this.hashTableValues[index].graphicID);
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}
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else
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{
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this.cmd("SetNull", node.graphicID, 1);
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this.cmd("SetNull", this.hashTableVisual[index], 0);
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}
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this.cmd("connect", this.hashTableVisual[index], node.graphicID);
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node.next = this.hashTableValues[index];
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this.hashTableValues[index] = node;
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this.repositionList(index);
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this.cmd("SetText", this.ExplainLabel, "");
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return this.commands;
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}
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OpenHash.prototype.repositionList = function(index)
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{
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var startX = POINTER_ARRAY_ELEM_START_X + index *POINTER_ARRAY_ELEM_WIDTH;
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var startY = this.POINTER_ARRAY_ELEM_Y - LINKED_ITEM_Y_DELTA;
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var tmp = this.hashTableValues[index];
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while (tmp != null)
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{
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tmp.x = startX;
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tmp.y = startY;
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this.cmd("Move", tmp.graphicID, tmp.x, tmp.y);
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startY = startY - LINKED_ITEM_Y_DELTA;
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tmp = tmp.next;
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}
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}
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OpenHash.prototype.deleteElement = function(elem)
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{
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this.commands = new Array();
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this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem);
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var index = this.doHash(elem);
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if (this.hashTableValues[index] == null)
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{
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this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem + " Element not in table");
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return this.commands;
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}
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this.cmd("SetHighlight", this.hashTableValues[index].graphicID, 1);
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this.cmd("Step");
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this.cmd("SetHighlight", this.hashTableValues[index].graphicID, 0);
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if (this.hashTableValues[index].data == elem)
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{
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if (this.hashTableValues[index].next != null)
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{
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this.cmd("Connect", this.hashTableVisual[index], this.hashTableValues[index].next.graphicID);
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}
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else
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{
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this.cmd("SetNull", this.hashTableVisual[index], 1);
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}
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this.cmd("Delete", this.hashTableValues[index].graphicID);
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this.hashTableValues[index] = this.hashTableValues[index].next;
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this.repositionList(index);
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return this.commands;
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}
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var tmpPrev = this.hashTableValues[index];
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var tmp = this.hashTableValues[index].next;
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var found = false;
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while (tmp != null && !found)
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{
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this.cmd("SetHighlight", tmp.graphicID, 1);
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this.cmd("Step");
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this.cmd("SetHighlight", tmp.graphicID, 0);
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if (tmp.data == elem)
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{
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found = true;
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this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem + " 元素已删除");
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if (tmp.next != null)
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{
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this.cmd("Connect", tmpPrev.graphicID, tmp.next.graphicID);
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}
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else
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{
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this.cmd("SetNull", tmpPrev.graphicID, 1);
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}
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tmpPrev.next = tmpPrev.next.next;
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this.cmd("Delete", tmp.graphicID);
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this.repositionList(index);
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}
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else
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{
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tmpPrev = tmp;
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tmp = tmp.next;
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}
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}
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if (!found)
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{
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this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem + " Element not in table");
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}
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return this.commands;
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}
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OpenHash.prototype.findElement = function(elem)
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{
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this.commands = new Array();
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this.cmd("SetText", this.ExplainLabel, "正在搜索元素： " + elem);
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var index = this.doHash(elem);
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var compareIndex = this.nextIndex++;
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var found = false;
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var tmp = this.hashTableValues[index];
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this.cmd("CreateLabel", compareIndex, "", 10, 40, 0);
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while (tmp != null && !found)
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{
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this.cmd("SetHighlight", tmp.graphicID, 1);
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if (tmp.data == elem)
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{
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this.cmd("SetText", compareIndex, tmp.data + "==" + elem)
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found = true;
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}
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else
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{
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this.cmd("SetText", compareIndex, tmp.data + "!=" + elem)
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}
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this.cmd("Step");
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this.cmd("SetHighlight", tmp.graphicID, 0);
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tmp = tmp.next;
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}
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if (found)
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{
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this.cmd("SetText", this.ExplainLabel, "正在搜索元素： " + elem+ " 已找到！")
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}
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else
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{
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this.cmd("SetText", this.ExplainLabel, "正在搜索元素： " + elem+ " 未找到！")
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}
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this.cmd("Delete", compareIndex);
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this.nextIndex--;
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return this.commands;
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}
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OpenHash.prototype.setup = function()
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{
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this.hashTableVisual = new Array(HASH_TABLE_SIZE);
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this.hashTableIndices = new Array(HASH_TABLE_SIZE);
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this.hashTableValues = new Array(HASH_TABLE_SIZE);
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this.indexXPos = new Array(HASH_TABLE_SIZE);
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this.indexYPos = new Array(HASH_TABLE_SIZE);
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this.ExplainLabel = this.nextIndex++;
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this.table_size = HASH_TABLE_SIZE;
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this.commands = [];
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for (var i = 0; i < HASH_TABLE_SIZE; i++)
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{
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var nextID = this.nextIndex++;
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this.cmd("CreateRectangle", nextID, "", POINTER_ARRAY_ELEM_WIDTH, POINTER_ARRAY_ELEM_HEIGHT, POINTER_ARRAY_ELEM_START_X + i *POINTER_ARRAY_ELEM_WIDTH, this.POINTER_ARRAY_ELEM_Y)
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this.hashTableVisual[i] = nextID;
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this.cmd("SetNull", this.hashTableVisual[i], 1);
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nextID = this.nextIndex++;
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this.hashTableIndices[i] = nextID;
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this.indexXPos[i] = POINTER_ARRAY_ELEM_START_X + i *POINTER_ARRAY_ELEM_WIDTH;
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this.indexYPos[i] = this.POINTER_ARRAY_ELEM_Y + POINTER_ARRAY_ELEM_HEIGHT
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this.hashTableValues[i] = null;
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this.cmd("CreateLabel", nextID, i,this.indexXPos[i],this.indexYPos[i] );
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this.cmd("SetForegroundColor", nextID, INDEX_COLOR);
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}
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this.cmd("CreateLabel", this.ExplainLabel, "", 10, 25, 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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this.resetIndex = this.nextIndex;
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}
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OpenHash.prototype.resetAll = function()
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{
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var tmp;
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this.commands = OpenHash.superclass.resetAll.call(this);
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for (var i = 0; i < this.hashTableValues.length; i++)
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{
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tmp = this.hashTableValues[i];
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if (tmp != null)
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{
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while (tmp != null)
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{
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this.cmd("Delete", tmp.graphicID);
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tmp = tmp.next;
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}
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this.hashTableValues[i] = null;
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this.cmd("SetNull", this.hashTableVisual[i], 1);
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}
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}
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return this.commands;
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}
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// NEED TO OVERRIDE IN PARENT
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OpenHash.prototype.reset = function()
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{
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for (var i = 0; i < this.table_size; i++)
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{
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this.hashTableValues[i] = null;
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}
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this.nextIndex = this.resetIndex;
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OpenHash.superclass.reset.call(this);
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}
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OpenHash.prototype.resetCallback = function(event)
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{
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}
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/*this.nextIndex = 0;
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this.commands = [];
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this.cmd("CreateLabel", 0, "", 20, 50, 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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OpenHash.prototype.disableUI = function(event)
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{
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var sc = OpenHash.superclass;
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var fn = sc.disableUI;
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fn.call(this);
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}
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OpenHash.prototype.enableUI = function(event)
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{
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OpenHash.superclass.enableUI.call(this);
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}
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function LinkedListNode(val, id, initialX, initialY)
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{
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this.data = val;
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this.graphicID = id;
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this.x = initialX;
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this.y = initialY;
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this.next = null;
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}
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var currentAlg;
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function init()
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{
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var animManag = initCanvas();
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currentAlg = new OpenHash(animManag, canvas.width, canvas.height);
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}
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