405 行
13 KiB
JavaScript
405 行
13 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 Heap(am)
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{
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this.init(am);
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}
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Heap.prototype = new Algorithm();
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Heap.prototype.constructor = Heap;
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Heap.superclass = Algorithm.prototype;
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var ARRAY_SIZE = 32;
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var ARRAY_ELEM_WIDTH = 30;
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var ARRAY_ELEM_HEIGHT = 25;
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var ARRAY_INITIAL_X = 30;
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var ARRAY_Y_POS = 50;
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var ARRAY_LABEL_Y_POS = 70;
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Heap.prototype.init = function(am)
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{
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var sc = Heap.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 = 0;
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this.HeapXPositions = [0, 450, 250, 650, 150, 350, 550, 750, 100, 200, 300, 400, 500, 600,
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700, 800, 075, 125, 175, 225, 275, 325, 375, 425, 475, 525, 575,
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625, 675, 725, 775, 825];
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this.HeapYPositions = [0, 100, 170, 170, 240, 240, 240, 240, 310, 310, 310, 310, 310, 310,
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310, 310, 380, 380, 380, 380, 380, 380, 380, 380, 380, 380, 380,
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380, 380, 380, 380, 380];
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this.commands = [];
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this.createArray();
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/*this.nextIndex = 0;
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this.this.commands = [];
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this.cmd("CreateLabel", 0, "", 20, 50, 0);
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this.animationManager.StartNewAnimation(this.this.commands);
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this.animationManager.skipForward();
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this.animationManager.clearHistory(); */
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}
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Heap.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, true);
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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.removeSmallestButton = addControlToAlgorithmBar("Button", "Remove Smallest");
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this.removeSmallestButton.onclick = this.removeSmallestCallback.bind(this);
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this.clearHeapButton = addControlToAlgorithmBar("Button", "Clear Heap");
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this.clearHeapButton.onclick = this.clearCallback.bind(this);
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this.buildHeapButton = addControlToAlgorithmBar("Button", "BuildHeap");
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this.buildHeapButton.onclick = this.buildHeapCallback.bind(this);
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}
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Heap.prototype.createArray = function()
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{
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this.arrayData = new Array(ARRAY_SIZE);
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this.arrayLabels = new Array(ARRAY_SIZE);
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this.arrayRects = new Array(ARRAY_SIZE);
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this.circleObjs = new Array(ARRAY_SIZE);
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this.ArrayXPositions = new Array(ARRAY_SIZE);
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this.currentHeapSize = 0;
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for (var i = 0; i < ARRAY_SIZE; i++)
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{
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this.ArrayXPositions[i] = ARRAY_INITIAL_X + i *ARRAY_ELEM_WIDTH;
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this.arrayLabels[i] = this.nextIndex++;
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this.arrayRects[i] = this.nextIndex++;
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this.circleObjs[i] = this.nextIndex++;
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this.cmd("CreateRectangle", this.arrayRects[i], "", ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT, this.ArrayXPositions[i] , ARRAY_Y_POS)
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this.cmd("CreateLabel", this.arrayLabels[i], i, this.ArrayXPositions[i], ARRAY_LABEL_Y_POS);
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this.cmd("SetForegroundColor", this.arrayLabels[i], "#0000FF");
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}
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this.cmd("SetText", this.arrayRects[0], "-INF");
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this.swapLabel1 = this.nextIndex++;
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this.swapLabel2 = this.nextIndex++;
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this.swapLabel3 = this.nextIndex++;
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this.swapLabel4 = this.nextIndex++;
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this.descriptLabel1 = this.nextIndex++;
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this.descriptLabel2 = this.nextIndex++;
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this.cmd("CreateLabel", this.descriptLabel1, "", 20, 10, 0);
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//this.cmd("CreateLabel", this.descriptLabel2, "", this.nextIndex, 40, 120, 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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Heap.prototype.insertCallback = function(event)
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{
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var insertedValue;
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insertedValue = this.normalizeNumber(this.insertField.value, 4);
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if (insertedValue != "")
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{
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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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//TODO: Make me undoable!!
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Heap.prototype.clearCallback = function(event)
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{
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this.commands = new Array();
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this.implementAction(this.clear.bind(this),"");
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}
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//TODO: Make me undoable!!
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Heap.prototype.clear = function()
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{
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while (this.currentHeapSize > 0)
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{
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this.cmd("Delete", this.circleObjs[this.currentHeapSize]);
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this.cmd("SetText", this.arrayRects[this.currentHeapSize], "");
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this.currentHeapSize--;
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}
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return this.commands;
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}
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Heap.prototype.reset = function()
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{
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this.currentHeapSize = 0;
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}
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Heap.prototype.removeSmallestCallback = function(event)
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{
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this.implementAction(this.removeSmallest.bind(this),"");
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}
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Heap.prototype.swap = function(index1, index2)
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{
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this.cmd("SetText", this.arrayRects[index1], "");
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this.cmd("SetText", this.arrayRects[index2], "");
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this.cmd("SetText", this.circleObjs[index1], "");
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this.cmd("SetText", this.circleObjs[index2], "");
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this.cmd("CreateLabel", this.swapLabel1, this.arrayData[index1], this.ArrayXPositions[index1],ARRAY_Y_POS);
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this.cmd("CreateLabel", this.swapLabel2, this.arrayData[index2], this.ArrayXPositions[index2],ARRAY_Y_POS);
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this.cmd("CreateLabel", this.swapLabel3, this.arrayData[index1], this.HeapXPositions[index1],this.HeapYPositions[index1]);
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this.cmd("CreateLabel", this.swapLabel4, this.arrayData[index2], this.HeapXPositions[index2],this.HeapYPositions[index2]);
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this.cmd("Move", this.swapLabel1, this.ArrayXPositions[index2],ARRAY_Y_POS)
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this.cmd("Move", this.swapLabel2, this.ArrayXPositions[index1],ARRAY_Y_POS)
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this.cmd("Move", this.swapLabel3, this.HeapXPositions[index2],this.HeapYPositions[index2])
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this.cmd("Move", this.swapLabel4, this.HeapXPositions[index1],this.HeapYPositions[index1])
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var tmp = this.arrayData[index1];
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this.arrayData[index1] = this.arrayData[index2];
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this.arrayData[index2] = tmp;
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this.cmd("Step")
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this.cmd("SetText", this.arrayRects[index1], this.arrayData[index1]);
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this.cmd("SetText", this.arrayRects[index2], this.arrayData[index2]);
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this.cmd("SetText", this.circleObjs[index1], this.arrayData[index1]);
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this.cmd("SetText", this.circleObjs[index2], this.arrayData[index2]);
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this.cmd("Delete", this.swapLabel1);
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this.cmd("Delete", this.swapLabel2);
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this.cmd("Delete", this.swapLabel3);
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this.cmd("Delete", this.swapLabel4);
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}
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Heap.prototype.setIndexHighlight = function(index, highlightVal)
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{
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this.cmd("SetHighlight", this.circleObjs[index], highlightVal);
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this.cmd("SetHighlight", this.arrayRects[index], highlightVal);
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}
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Heap.prototype.pushDown = function(index)
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{
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var smallestIndex;
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while(true)
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{
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if (index*2 > this.currentHeapSize)
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{
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return;
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}
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smallestIndex = 2*index;
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if (index*2 + 1 <= this.currentHeapSize)
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{
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this.setIndexHighlight(2*index, 1);
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this.setIndexHighlight(2*index + 1, 1);
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this.cmd("Step");
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this.setIndexHighlight(2*index, 0);
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this.setIndexHighlight(2*index + 1, 0);
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if (this.arrayData[2*index + 1] < this.arrayData[2*index])
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{
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smallestIndex = 2*index + 1;
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}
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}
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this.setIndexHighlight(index, 1);
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this.setIndexHighlight(smallestIndex, 1);
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this.cmd("Step");
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this.setIndexHighlight(index, 0);
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this.setIndexHighlight(smallestIndex, 0);
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if (this.arrayData[smallestIndex] < this.arrayData[index])
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{
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this.swap(smallestIndex, index);
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index = smallestIndex;
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}
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else
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{
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return;
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}
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}
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}
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Heap.prototype.removeSmallest = function(dummy)
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{
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this.commands = new Array();
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this.cmd("SetText", this.descriptLabel1, "");
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if (this.currentHeapSize == 0)
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{
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this.cmd("SetText", this.descriptLabel1, "Heap is empty, cannot remove smallest element");
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return this.commands;
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}
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this.cmd("SetText", this.descriptLabel1, "Removing element:");
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this.cmd("CreateLabel", this.descriptLabel2, this.arrayData[1], this.HeapXPositions[1], this.HeapYPositions[1], 0);
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this.cmd("SetText", this.circleObjs[1], "");
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this.cmd("Move", this.descriptLabel2, 120, 40)
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this.cmd("Step");
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this.cmd("Delete", this.descriptLabel2);
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this.cmd("SetText", this.descriptLabel1, "Removing element: " + this.arrayData[1]);
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this.arrayData[1] = "";
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if (this.currentHeapSize > 1)
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{
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this.cmd("SetText", this.arrayRects[1], "");
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this.cmd("SetText", this.arrayRects[this.currentHeapSize], "");
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this.swap(1,this.currentHeapSize);
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this.cmd("Delete", this.circleObjs[this.currentHeapSize]);
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this.currentHeapSize--;
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this.pushDown(1);
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} else {
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this.cmd("SetText", this.arrayRects[1], "");
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this.cmd("Delete", this.circleObjs[this.currentHeapSize]);
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this.currentHeapSize--;
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}
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return this.commands;
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}
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Heap.prototype.buildHeapCallback = function(event)
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{
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this.implementAction(this.buildHeap.bind(this),"");
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}
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Heap.prototype.buildHeap = function(ignored)
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{
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this.commands = [];
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this.clear();
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for (var i = 1; i <ARRAY_SIZE; i++)
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{
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this.arrayData[i] = this.normalizeNumber(String(ARRAY_SIZE - i), 4);
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this.cmd("CreateCircle", this.circleObjs[i], this.arrayData[i], this.HeapXPositions[i], this.HeapYPositions[i]);
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this.cmd("SetText", this.arrayRects[i], this.arrayData[i]);
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if (i > 1)
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{
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this.cmd("Connect", this.circleObjs[Math.floor(i/2)], this.circleObjs[i]);
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}
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}
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this.cmd("Step");
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this.currentHeapSize = ARRAY_SIZE - 1;
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var nextElem = this.currentHeapSize;
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while(nextElem > 0)
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{
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this.pushDown(nextElem);
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nextElem = nextElem - 1;
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}
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return this.commands;
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}
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Heap.prototype.insertElement = function(insertedValue)
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{
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this.commands = new Array();
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if (this.currentHeapSize >= ARRAY_SIZE - 1)
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{
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this.cmd("SetText", this.descriptLabel1, "Heap Full!");
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return this.commands;
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}
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this.cmd("SetText", this.descriptLabel1, "Inserting Element: " + insertedValue);
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this.cmd("Step");
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this.cmd("SetText", this.descriptLabel1, "Inserting Element: ");
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this.currentHeapSize++;
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this.arrayData[this.currentHeapSize] = insertedValue;
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this.cmd("CreateCircle",this.circleObjs[this.currentHeapSize], "", this.HeapXPositions[this.currentHeapSize], this.HeapYPositions[this.currentHeapSize]);
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this.cmd("CreateLabel", this.descriptLabel2, insertedValue, 120, 45, 1);
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if (this.currentHeapSize > 1)
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{
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this.cmd("Connect", this.circleObjs[Math.floor(this.currentHeapSize / 2)], this.circleObjs[this.currentHeapSize]);
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}
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this.cmd("Move", this.descriptLabel2, this.HeapXPositions[this.currentHeapSize], this.HeapYPositions[this.currentHeapSize]);
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this.cmd("Step");
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this.cmd("SetText", this.circleObjs[this.currentHeapSize], insertedValue);
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this.cmd("delete", this.descriptLabel2);
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this.cmd("SetText", this.arrayRects[this.currentHeapSize], insertedValue);
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var currentIndex = this.currentHeapSize;
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var parentIndex = Math.floor(currentIndex / 2);
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if (currentIndex > 1)
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{
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this.setIndexHighlight(currentIndex, 1);
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this.setIndexHighlight(parentIndex, 1);
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this.cmd("Step");
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this.setIndexHighlight(currentIndex, 0);
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this.setIndexHighlight(parentIndex, 0);
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}
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while (currentIndex > 1 && this.arrayData[currentIndex] < this.arrayData[parentIndex])
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{
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this.swap(currentIndex, parentIndex);
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currentIndex = parentIndex;
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parentIndex = Math.floor(parentIndex / 2);
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if (currentIndex > 1)
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{
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this.setIndexHighlight(currentIndex, 1);
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this.setIndexHighlight(parentIndex, 1);
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this.cmd("Step");
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this.setIndexHighlight(currentIndex, 0);
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this.setIndexHighlight(parentIndex, 0);
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}
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}
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this.cmd("SetText", this.descriptLabel1, "");
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return this.commands;
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}
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Heap.prototype.disableUI = function(event)
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{
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this.insertField.disabled = true;
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this.insertButton.disabled = true;
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this.removeSmallestButton.disabled = true;
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this.clearHeapButton.disabled = true;
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this.buildHeapButton.disabled = true;
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}
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Heap.prototype.enableUI = function(event)
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{
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this.insertField.disabled = false;
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this.insertButton.disabled = false;
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this.removeSmallestButton.disabled = false;
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this.clearHeapButton.disabled = false;
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this.buildHeapButton.disabled = false;
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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 Heap(animManag, canvas.width, canvas.height);
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}
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