364 行
9.6 KiB
JavaScript
364 行
9.6 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 ClosedHashBucket(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 ARRAY_ELEM_WIDTH = 90;
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var ARRAY_ELEM_HEIGHT = 30;
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var ARRAY_ELEM_START_X = 50;
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var ARRAY_ELEM_START_Y = 100;
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var ARRAY_VERTICAL_SEPARATION = 100;
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var CLOSED_HASH_TABLE_SIZE = 29;
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var BUCKET_SIZE = 3;
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var NUM_BUCKETS = 11;
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var CLOSED_HASH_TABLE_SIZE = 40;
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var ARRAY_Y_POS = 350;
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var INDEX_COLOR = "#0000FF";
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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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ClosedHashBucket.prototype = new Hash();
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ClosedHashBucket.prototype.constructor = ClosedHashBucket;
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ClosedHashBucket.superclass = Hash.prototype;
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ClosedHashBucket.prototype.init = function(am, w, h)
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{
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var sc = ClosedHashBucket.superclass;
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var fn = sc.init;
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fn.call(this,am, w, h);
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this.elements_per_row = Math.floor(w / ARRAY_ELEM_WIDTH) ;
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//Change me!
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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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ClosedHashBucket.prototype.addControls = function()
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{
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ClosedHashBucket.superclass.addControls.call(this);
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// Add new controls
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}
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ClosedHashBucket.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 foundIndex = -1;
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for (var candidateIndex = index * BUCKET_SIZE; candidateIndex < index * BUCKET_SIZE + BUCKET_SIZE; candidateIndex++)
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{
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 1);
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this.cmd("Step");
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 0);
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if (this.empty[candidateIndex])
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{
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foundIndex = candidateIndex;
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break;
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}
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}
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if (foundIndex == -1)
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{
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for (candidateIndex = BUCKET_SIZE * NUM_BUCKETS; candidateIndex < CLOSED_HASH_TABLE_SIZE; candidateIndex++)
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{
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 1);
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this.cmd("Step");
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 0);
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if (this.empty[candidateIndex])
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{
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foundIndex = candidateIndex;
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break;
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}
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}
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}
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if (foundIndex != -1)
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{
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var labID = this.nextIndex++;
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this.cmd("CreateLabel", labID, elem, 20, 25);
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this.cmd("Move", labID, this.indexXPos2[foundIndex], this.indexYPos2[foundIndex] - ARRAY_ELEM_HEIGHT);
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this.cmd("Step");
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this.cmd("Delete", labID);
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this.cmd("SetText", this.hashTableVisual[foundIndex], elem);
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this.hashTableValues[foundIndex] = elem;
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this.empty[foundIndex] = false;
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this.deleted[foundIndex] = false;
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}
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this.cmd("SetText", this.ExplainLabel, "");
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return this.commands;
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}
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ClosedHashBucket.prototype.getElemIndex = function(elem)
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{
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var foundIndex = -1;
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var initialIndex = this.doHash(elem);
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for (var candidateIndex = initialIndex * BUCKET_SIZE; candidateIndex < initialIndex* BUCKET_SIZE + BUCKET_SIZE; candidateIndex++)
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{
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 1);
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this.cmd("Step");
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 0);
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if (!this.empty[candidateIndex] && this.hashTableValues[candidateIndex] == elem)
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{
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return candidateIndex;
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}
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else if (this.empty[candidateIndex] && !this.deleted[candidateIndex])
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{
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return -1;
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}
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}
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// Can only get this far if we didn't find the element we are looking for,
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// *and* the bucekt was full -- look at overflow bucket.
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for (candidateIndex = BUCKET_SIZE * NUM_BUCKETS; candidateIndex < CLOSED_HASH_TABLE_SIZE; candidateIndex++)
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{
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 1);
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this.cmd("Step");
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this.cmd("SetHighlight", this.hashTableVisual[candidateIndex], 0);
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if (!this.empty[candidateIndex] && this.hashTableValues[candidateIndex] == elem)
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{
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return candidateIndex;
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}
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else if (this.empty[candidateIndex] && !this.deleted[candidateIndex])
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{
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return -1;
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}
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}
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return -1;
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}
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ClosedHashBucket.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.getElemIndex(elem);
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if (index == -1)
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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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else
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{
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this.cmd("SetText", this.ExplainLabel, "正在删除元素： " + elem + " Element this.deleted");
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this.empty[index] = true;
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this.deleted[index] = true;
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this.cmd("SetText", this.hashTableVisual[index], "<deleted>");
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}
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return this.commands;
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}
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ClosedHashBucket.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.getElemIndex(elem);
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if (index == -1)
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{
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this.cmd("SetText", this.ExplainLabel, "Element " + elem + " 未找到");
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}
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else
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{
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this.cmd("SetText", this.ExplainLabel, "Element " + elem + " found");
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}
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return this.commands;
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}
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ClosedHashBucket.prototype.setup = function()
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{
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this.table_size = NUM_BUCKETS;
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this.hashTableVisual = new Array(CLOSED_HASH_TABLE_SIZE);
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this.hashTableIndices = new Array(CLOSED_HASH_TABLE_SIZE);
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this.hashTableValues = new Array(CLOSED_HASH_TABLE_SIZE);
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this.indexXPos = new Array(NUM_BUCKETS);
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this.indexYPos = new Array(NUM_BUCKETS);
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this.indexXPos2 = new Array(CLOSED_HASH_TABLE_SIZE);
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this.indexYPos2 = new Array(CLOSED_HASH_TABLE_SIZE);
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this.empty = new Array(CLOSED_HASH_TABLE_SIZE);
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this.deleted = new Array(CLOSED_HASH_TABLE_SIZE);
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this.ExplainLabel = this.nextIndex++;
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this.commands = [];
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for (var i = 0; i < CLOSED_HASH_TABLE_SIZE; i++)
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{
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var nextID = this.nextIndex++;
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this.empty[i] = true;
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this.deleted[i] = false;
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var nextXPos = ARRAY_ELEM_START_X + (i % this.elements_per_row) * ARRAY_ELEM_WIDTH;
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var nextYPos = ARRAY_ELEM_START_Y + Math.floor(i / this.elements_per_row) * ARRAY_VERTICAL_SEPARATION;
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this.cmd("CreateRectangle", nextID, "", ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT,nextXPos, nextYPos)
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this.hashTableVisual[i] = nextID;
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nextID = this.nextIndex++;
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this.hashTableIndices[i] = nextID;
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this.indexXPos2[i] = nextXPos;
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this.indexYPos2[i] = nextYPos + ARRAY_ELEM_HEIGHT
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this.cmd("CreateLabel", nextID, i,this.indexXPos2[i],this.indexYPos2[i]);
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this.cmd("SetForegroundColor", nextID, INDEX_COLOR);
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}
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for (i = 0; i <= NUM_BUCKETS; i++)
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{
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nextID = this.nextIndex++;
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nextXPos = ARRAY_ELEM_START_X + (i * 3 % this.elements_per_row) * ARRAY_ELEM_WIDTH - ARRAY_ELEM_WIDTH / 2;
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nextYPos = ARRAY_ELEM_START_Y + Math.floor((i * 3) / this.elements_per_row) * ARRAY_VERTICAL_SEPARATION + ARRAY_ELEM_HEIGHT;
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this.cmd("CreateRectangle", nextID, "", 0, ARRAY_ELEM_HEIGHT * 2,nextXPos, nextYPos)
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nextID = this.nextIndex++;
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if (i == NUM_BUCKETS)
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{
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this.cmd("CreateLabel", nextID, "Overflow", nextXPos + 3, nextYPos + ARRAY_ELEM_HEIGHT / 2 , 0);
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}
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else
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{
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this.indexXPos[i] = nextXPos + 5;
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this.indexYPos[i] = nextYPos + ARRAY_ELEM_HEIGHT / 2;
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this.cmd("CreateLabel", nextID, i, this.indexXPos[i],this.indexYPos[i], 0);
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}
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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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ClosedHashBucket.prototype.resetAll = function()
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{
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this.commands = ClosedHashBucket.superclass.resetAll.call(this);
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for (var i = 0; i < CLOSED_HASH_TABLE_SIZE; i++)
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{
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this.empty[i] = true;
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this.deleted[i] = false;
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this.cmd("SetText", this.hashTableVisual[i], "");
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}
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return this.commands;
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// Clear array, etc
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}
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// NEED TO OVERRIDE IN PARENT
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ClosedHashBucket.prototype.reset = function()
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{
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for (var i = 0; i < CLOSED_HASH_TABLE_SIZE; i++)
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{
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this.empty[i]= true;
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this.deleted[i] = false;
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}
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this.nextIndex = this.resetIndex ;
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ClosedHashBucket.superclass.reset.call(this);
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}
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ClosedHashBucket.prototype.disableUI = function(event)
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{
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ClosedHashBucket.superclass.disableUI.call(this);
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}
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ClosedHashBucket.prototype.enableUI = function(event)
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{
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ClosedHashBucket.superclass.enableUI.call(this);
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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 ClosedHashBucket(animManag, canvas.width, canvas.height);
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}
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