// Copyright 2011 David Galles, University of San Francisco. All rights reserved. // // Redistribution and use in source and binary forms, with or without modification, are // permitted provided that the following conditions are met: // // 1. Redistributions of source code must retain the above copyright notice, this list of // conditions and the following disclaimer. // // 2. Redistributions in binary form must reproduce the above copyright notice, this list // of conditions and the following disclaimer in the documentation and/or other materials // provided with the distribution. // // THIS SOFTWARE IS PROVIDED BY ``AS IS'' AND ANY EXPRESS OR IMPLIED // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND // FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL OR // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON // ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // // The views and conclusions contained in the software and documentation are those of the // authors and should not be interpreted as representing official policies, either expressed // or implied, of the University of San Francisco var ARRAY_START_X = 100; var ARRAY_START_Y = 200; var ARRAY_ELEM_WIDTH = 50; var ARRAY_ELEM_HEIGHT = 50; var ARRRAY_ELEMS_PER_LINE = 15; var ARRAY_LINE_SPACING = 130; var HEAD_POS_X = 180; var HEAD_POS_Y = 100; var HEAD_LABEL_X = 130; var HEAD_LABEL_Y = 100; var TAIL_POS_X = 280; var TAIL_POS_Y = 100; var TAIL_LABEL_X = 230; var TAIL_LABEL_Y = 100; var QUEUE_LABEL_X = 50; var QUEUE_LABEL_Y = 30; var QUEUE_ELEMENT_X = 120; var QUEUE_ELEMENT_Y = 30; var INDEX_COLOR = "#0000FF" var SIZE = 15; function QueueArray(am, w, h) { this.init(am, w, h); } QueueArray.prototype = new Algorithm(); QueueArray.prototype.constructor = QueueArray; QueueArray.superclass = Algorithm.prototype; QueueArray.prototype.init = function(am, w, h) { QueueArray.superclass.init.call(this, am, w, h); this.addControls(); this.nextIndex = 0; this.commands = []; //this.tail_pos_y = h - LINKED_LIST_ELEM_HEIGHT; // this.tail_label_y = this.tail_pos_y; this.setup(); this.initialIndex = this.nextIndex; } QueueArray.prototype.addControls = function() { this.controls = []; this.enqueueField = addControlToAlgorithmBar("Text", ""); this.enqueueField.onkeydown = this.returnSubmit(this.enqueueField, this.enqueueCallback.bind(this), 6); this.enqueueButton = addControlToAlgorithmBar("Button", "Enqueue"); this.enqueueButton.onclick = this.enqueueCallback.bind(this); this.controls.push(this.enqueueField); this.controls.push(this.enqueueButton); this.dequeueButton = addControlToAlgorithmBar("Button", "Dequeue"); this.dequeueButton.onclick = this.dequeueCallback.bind(this); this.controls.push(this.dequeueButton); this.clearButton = addControlToAlgorithmBar("Button", "Clear Queue"); this.clearButton.onclick = this.clearCallback.bind(this); this.controls.push(this.clearButton); } QueueArray.prototype.enableUI = function(event) { for (var i = 0; i < this.controls.length; i++) { this.controls[i].disabled = false; } } QueueArray.prototype.disableUI = function(event) { for (var i = 0; i < this.controls.length; i++) { this.controls[i].disabled = true; } } QueueArray.prototype.setup = function() { this.nextIndex = 0; this.arrayID = new Array(SIZE); this.arrayLabelID = new Array(SIZE); for (var i = 0; i < SIZE; i++) { this.arrayID[i]= this.nextIndex++; this.arrayLabelID[i]= this.nextIndex++; } this.headID = this.nextIndex++; headLabelID = this.nextIndex++; this.tailID = this.nextIndex++; tailLabelID = this.nextIndex++; this.arrayData = new Array(SIZE); this.head = 0; this.tail = 0; this.leftoverLabelID = this.nextIndex++; for (var i = 0; i < SIZE; i++) { var xpos = (i % ARRRAY_ELEMS_PER_LINE) * ARRAY_ELEM_WIDTH + ARRAY_START_X; var ypos = Math.floor(i / ARRRAY_ELEMS_PER_LINE) * ARRAY_LINE_SPACING + ARRAY_START_Y; this.cmd("CreateRectangle", this.arrayID[i],"", ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT,xpos, ypos); this.cmd("CreateLabel",this.arrayLabelID[i], i, xpos, ypos + ARRAY_ELEM_HEIGHT); this.cmd("SetForegroundColor", this.arrayLabelID[i], INDEX_COLOR); } this.cmd("CreateLabel", headLabelID, "Head", HEAD_LABEL_X, HEAD_LABEL_Y); this.cmd("CreateRectangle", this.headID, 0, ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT, HEAD_POS_X, HEAD_POS_Y); this.cmd("CreateLabel", tailLabelID, "Tail", TAIL_LABEL_X, TAIL_LABEL_Y); this.cmd("CreateRectangle", this.tailID, 0, ARRAY_ELEM_WIDTH, ARRAY_ELEM_HEIGHT, TAIL_POS_X, TAIL_POS_Y); this.cmd("CreateLabel", this.leftoverLabelID, "", QUEUE_LABEL_X, QUEUE_LABEL_Y); this.initialIndex = this.nextIndex; this.highlight1ID = this.nextIndex++; this.highlight2ID = this.nextIndex++; this.animationManager.StartNewAnimation(this.commands); this.animationManager.skipForward(); this.animationManager.clearHistory(); } QueueArray.prototype.reset = function() { this.top = 0; this.nextIndex = this.initialIndex; } QueueArray.prototype.enqueueCallback = function(event) { if ((this.tail + 1) % SIZE != this.head && this.enqueueField.value != "") { var pushVal = this.enqueueField.value; this.enqueueField.value = "" this.implementAction(this.enqueue.bind(this), pushVal); } } QueueArray.prototype.dequeueCallback = function(event) { if (this.tail != this.head) { this.implementAction(this.dequeue.bind(this), ""); } } QueueArray.prototype.clearCallback = function(event) { this.implementAction(this.clearAll.bind(this), ""); } QueueArray.prototype.enqueue = function(elemToEnqueue) { this.commands = new Array(); var labEnqueueID = this.nextIndex++; var labEnqueueValID = this.nextIndex++; this.arrayData[this.tail] = elemToEnqueue; this.cmd("SetText", this.leftoverLabelID, ""); this.cmd("CreateLabel", labEnqueueID, "Enqueuing Value: ", QUEUE_LABEL_X, QUEUE_LABEL_Y); this.cmd("CreateLabel", labEnqueueValID,elemToEnqueue, QUEUE_ELEMENT_X, QUEUE_ELEMENT_Y); this.cmd("Step"); this.cmd("CreateHighlightCircle", this.highlight1ID, INDEX_COLOR, TAIL_POS_X, TAIL_POS_Y); this.cmd("Step"); var xpos = (this.tail % ARRRAY_ELEMS_PER_LINE) * ARRAY_ELEM_WIDTH + ARRAY_START_X; var ypos = Math.floor(this.tail / ARRRAY_ELEMS_PER_LINE) * ARRAY_LINE_SPACING + ARRAY_START_Y; this.cmd("Move", this.highlight1ID, xpos, ypos + ARRAY_ELEM_HEIGHT); this.cmd("Step"); this.cmd("Move", labEnqueueValID, xpos, ypos); this.cmd("Step"); this.cmd("Settext", this.arrayID[this.tail], elemToEnqueue); this.cmd("Delete", labEnqueueValID); this.cmd("Delete", this.highlight1ID); this.cmd("SetHighlight", this.tailID, 1); this.cmd("Step"); this.tail = (this.tail + 1) % SIZE; this.cmd("SetText", this.tailID, this.tail) this.cmd("Step"); this.cmd("SetHighlight", this.tailID, 0); this.cmd("Delete", labEnqueueID); return this.commands; } QueueArray.prototype.dequeue = function(ignored) { this.commands = new Array(); var labDequeueID = this.nextIndex++; var labDequeueValID = this.nextIndex++; this.cmd("SetText", this.leftoverLabelID, ""); this.cmd("CreateLabel", labDequeueID, "Dequeued Value: ", QUEUE_LABEL_X, QUEUE_LABEL_Y); this.cmd("CreateHighlightCircle", this.highlight1ID, INDEX_COLOR, HEAD_POS_X, HEAD_POS_Y); this.cmd("Step"); var xpos = (this.head % ARRRAY_ELEMS_PER_LINE) * ARRAY_ELEM_WIDTH + ARRAY_START_X; var ypos = Math.floor(this.head / ARRRAY_ELEMS_PER_LINE) * ARRAY_LINE_SPACING + ARRAY_START_Y; this.cmd("Move", this.highlight1ID, xpos, ypos + ARRAY_ELEM_HEIGHT); this.cmd("Step"); this.cmd("Delete", this.highlight1ID); var dequeuedVal = this.arrayData[this.head] this.cmd("CreateLabel", labDequeueValID,dequeuedVal, xpos, ypos); this.cmd("Settext", this.arrayID[this.head], ""); this.cmd("Move", labDequeueValID, QUEUE_ELEMENT_X, QUEUE_ELEMENT_Y); this.cmd("Step"); this.cmd("SetHighlight", this.headID, 1); this.cmd("Step"); this.head = (this.head + 1 ) % SIZE; this.cmd("SetText", this.headID, this.head) this.cmd("Step"); this.cmd("SetHighlight", this.headID, 0); this.cmd("SetText", this.leftoverLabelID, "Dequeued Value: " + dequeuedVal); this.cmd("Delete", labDequeueID) this.cmd("Delete", labDequeueValID); return this.commands; } QueueArray.prototype.clearAll = function() { this.commands = new Array(); this.cmd("SetText", this.leftoverLabelID, ""); for (var i = 0; i < SIZE; i++) { this.cmd("SetText", this.arrayID[i], ""); } this.head = 0; this.tail = 0; this.cmd("SetText", this.headID, "0"); this.cmd("SetText", this.tailID, "0"); return this.commands; } var currentAlg; function init() { var animManag = initCanvas(); currentAlg = new QueueArray(animManag, canvas.width, canvas.height); }