302 行
7.9 KiB
JavaScript
302 行
7.9 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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var LINKED_LIST_START_X = 100;
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var LINKED_LIST_START_Y = 200;
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var LINKED_LIST_ELEM_WIDTH = 70;
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var LINKED_LIST_ELEM_HEIGHT = 30;
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var LINKED_LIST_INSERT_X = 250;
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var LINKED_LIST_INSERT_Y = 50;
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var LINKED_LIST_ELEMS_PER_LINE = 8;
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var LINKED_LIST_ELEM_SPACING = 100;
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var LINKED_LIST_LINE_SPACING = 100;
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var TOP_POS_X = 180;
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var TOP_POS_Y = 100;
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var TOP_LABEL_X = 130;
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var TOP_LABEL_Y = 100;
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var TOP_ELEM_WIDTH = 30;
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var TOP_ELEM_HEIGHT = 30;
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var PUSH_LABEL_X = 50;
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var PUSH_LABEL_Y = 30;
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var PUSH_ELEMENT_X = 120;
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var PUSH_ELEMENT_Y = 30;
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var SIZE = 32;
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function StackLL(am, w, h)
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{
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this.init(am, w, h);
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}
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StackLL.prototype = new Algorithm();
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StackLL.prototype.constructor = StackLL;
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StackLL.superclass = Algorithm.prototype;
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StackLL.prototype.init = function(am, w, h)
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{
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StackLL.superclass.init.call(this, am, w, h);
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this.addControls();
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this.nextIndex = 0;
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this.commands = [];
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this.setup();
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this.initialIndex = this.nextIndex;
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}
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StackLL.prototype.addControls = function()
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{
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this.controls = [];
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this.pushField = addControlToAlgorithmBar("Text", "");
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this.pushField.onkeydown = this.returnSubmit(this.pushField, this.pushCallback.bind(this), 6);
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this.pushButton = addControlToAlgorithmBar("Button", "Push");
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this.pushButton.onclick = this.pushCallback.bind(this);
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this.controls.push(this.pushField);
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this.controls.push(this.pushButton);
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this.popButton = addControlToAlgorithmBar("Button", "Pop");
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this.popButton.onclick = this.popCallback.bind(this);
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this.controls.push(this.popButton);
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this.clearButton = addControlToAlgorithmBar("Button", "Clear Stack");
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this.clearButton.onclick = this.clearCallback.bind(this);
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this.controls.push(this.clearButton);
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}
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StackLL.prototype.enableUI = function(event)
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{
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for (var i = 0; i < this.controls.length; i++)
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{
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this.controls[i].disabled = false;
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}
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}
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StackLL.prototype.disableUI = function(event)
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{
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for (var i = 0; i < this.controls.length; i++)
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{
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this.controls[i].disabled = true;
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}
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}
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StackLL.prototype.setup = function()
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{
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this.linkedListElemID = new Array(SIZE);
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for (var i = 0; i < SIZE; i++)
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{
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this.linkedListElemID[i]= this.nextIndex++;
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}
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this.topID = this.nextIndex++;
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this.topLabelID = this.nextIndex++;
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this.arrayData = new Array(SIZE);
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this.top = 0;
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this.leftoverLabelID = this.nextIndex++;
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this.cmd("CreateLabel", this.topLabelID, "Top", TOP_LABEL_X, TOP_LABEL_Y);
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this.cmd("CreateRectangle", this.topID, "", TOP_ELEM_WIDTH, TOP_ELEM_HEIGHT, TOP_POS_X, TOP_POS_Y);
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this.cmd("SetNull", this.topID, 1);
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this.cmd("CreateLabel", this.leftoverLabelID, "", PUSH_LABEL_X, PUSH_LABEL_Y);
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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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StackLL.prototype.resetLinkedListPositions = function()
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{
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for (var i = this.top - 1; i >= 0; i--)
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{
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var nextX = (this.top - 1 - i) % LINKED_LIST_ELEMS_PER_LINE * LINKED_LIST_ELEM_SPACING + LINKED_LIST_START_X;
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var nextY = Math.floor((this.top - 1 - i) / LINKED_LIST_ELEMS_PER_LINE) * LINKED_LIST_LINE_SPACING + LINKED_LIST_START_Y;
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this.cmd("Move", this.linkedListElemID[i], nextX, nextY);
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}
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}
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StackLL.prototype.reset = function()
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{
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this.top = 0;
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this.nextIndex = this.initialIndex;
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}
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StackLL.prototype.pushCallback = function(event)
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{
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if (this.top < SIZE && this.pushField.value != "")
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{
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var pushVal = this.pushField.value;
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this.pushField.value = ""
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this.implementAction(this.push.bind(this), pushVal);
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}
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}
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StackLL.prototype.popCallback = function(event)
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{
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if (this.top > 0)
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{
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this.implementAction(this.pop.bind(this), "");
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}
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}
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StackLL.prototype.clearCallback = function(event)
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{
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this.implementAction(this.clearAll.bind(this), "");
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}
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StackLL.prototype.push = function(elemToPush)
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{
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this.commands = new Array();
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var labPushID = this.nextIndex++;
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var labPushValID = this.nextIndex++;
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this.arrayData[this.top] = elemToPush;
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this.cmd("SetText", this.leftoverLabelID, "");
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this.cmd("CreateLinkedList",this.linkedListElemID[this.top], "" ,LINKED_LIST_ELEM_WIDTH, LINKED_LIST_ELEM_HEIGHT,
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LINKED_LIST_INSERT_X, LINKED_LIST_INSERT_Y, 0.25, 0, 1, 1);
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this.cmd("CreateLabel", labPushID, "Pushing Value: ", PUSH_LABEL_X, PUSH_LABEL_Y);
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this.cmd("CreateLabel", labPushValID,elemToPush, PUSH_ELEMENT_X, PUSH_ELEMENT_Y);
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this.cmd("Step");
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this.cmd("Move", labPushValID, LINKED_LIST_INSERT_X, LINKED_LIST_INSERT_Y);
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this.cmd("Step");
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this.cmd("SetText", this.linkedListElemID[this.top], elemToPush);
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this.cmd("Delete", labPushValID);
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if (this.top == 0)
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{
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this.cmd("SetNull", this.topID, 0);
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this.cmd("SetNull", this.linkedListElemID[this.top], 1);
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}
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else
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{
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this.cmd("Connect", this.linkedListElemID[this.top], this.linkedListElemID[this.top - 1]);
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this.cmd("Step");
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this.cmd("Disconnect", this.topID, this.linkedListElemID[this.top-1]);
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}
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this.cmd("Connect", this.topID, this.linkedListElemID[this.top]);
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this.cmd("Step");
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this.top = this.top + 1;
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this.resetLinkedListPositions();
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this.cmd("Delete", labPushID);
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this.cmd("Step");
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return this.commands;
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}
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StackLL.prototype.pop = function(ignored)
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{
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this.commands = new Array();
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var labPopID = this.nextIndex++;
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var labPopValID = this.nextIndex++;
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this.cmd("SetText", this.leftoverLabelID, "");
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this.cmd("CreateLabel", labPopID, "Popped Value: ", PUSH_LABEL_X, PUSH_LABEL_Y);
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this.cmd("CreateLabel", labPopValID,this.arrayData[this.top - 1], LINKED_LIST_START_X, LINKED_LIST_START_Y);
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this.cmd("Move", labPopValID, PUSH_ELEMENT_X, PUSH_ELEMENT_Y);
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this.cmd("Step");
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this.cmd("Disconnect", this.topID, this.linkedListElemID[this.top - 1]);
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if (this.top == 1)
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{
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this.cmd("SetNull", this.topID, 1);
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}
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else
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{
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this.cmd("Connect", this.topID, this.linkedListElemID[this.top-2]);
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}
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this.cmd("Step");
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this.cmd("Delete", this.linkedListElemID[this.top - 1]);
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this.top = this.top - 1;
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this.resetLinkedListPositions();
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this.cmd("Delete", labPopValID)
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this.cmd("Delete", labPopID);
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this.cmd("SetText", this.leftoverLabelID, "Popped Value: " + this.arrayData[this.top]);
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return this.commands;
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}
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StackLL.prototype.clearAll = function()
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{
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this.commands = new Array();
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for (var i = 0; i < this.top; i++)
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{
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this.cmd("Delete", this.linkedListElemID[i]);
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}
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this.top = 0;
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this.cmd("SetNull", this.topID, 1);
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return this.commands;
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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 StackLL(animManag, canvas.width, canvas.height);
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}
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