259 行
8.5 KiB
JavaScript
259 行
8.5 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 AUX_ARRAY_WIDTH = 25;
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var AUX_ARRAY_HEIGHT = 25;
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var AUX_ARRAY_START_Y = 50;
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var VISITED_START_X = 475;
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var PARENT_START_X = 400;
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var HIGHLIGHT_CIRCLE_COLOR = "#000000";
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var BFS_TREE_COLOR = "#0000FF";
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var BFS_QUEUE_HEAD_COLOR = "#0000FF";
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var QUEUE_START_X = 30;
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var QUEUE_START_Y = 50;
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var QUEUE_SPACING = 30;
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function BFS(am)
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{
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this.init(am);
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}
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BFS.prototype = new Graph();
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BFS.prototype.constructor = BFS;
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BFS.superclass = Graph.prototype;
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BFS.prototype.addControls = function()
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{
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addLabelToAlgorithmBar("Start Vertex: ");
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this.startField = addControlToAlgorithmBar("Text", "");
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this.startField.onkeydown = this.returnSubmit(this.startField, this.startCallback.bind(this), 2, true);
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this.startField.size = 2;
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this.startButton = addControlToAlgorithmBar("Button", "Run BFS");
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this.startButton.onclick = this.startCallback.bind(this);
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BFS.superclass.addControls.call(this);
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}
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BFS.prototype.init = function(am, w, h)
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{
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showEdgeCosts = false;
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BFS.superclass.init.call(this, am, w, h); // TODO: add no edge label flag to this?
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// Setup called in base class constructor
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}
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BFS.prototype.setup = function()
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{
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BFS.superclass.setup.call(this);
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this.messageID = new Array();
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this.commands = new Array();
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this.visitedID = new Array(this.size);
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this.visitedIndexID = new Array(this.size);
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this.parentID = new Array(this.size);
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this.parentIndexID = new Array(this.size);
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for (var i = 0; i < this.size; i++)
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{
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this.visitedID[i] = this.nextIndex++;
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this.visitedIndexID[i] = this.nextIndex++;
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this.parentID[i] = this.nextIndex++;
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this.parentIndexID[i] = this.nextIndex++;
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this.cmd("CreateRectangle", this.visitedID[i], "f", AUX_ARRAY_WIDTH, AUX_ARRAY_HEIGHT, VISITED_START_X, AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT);
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this.cmd("CreateLabel", this.visitedIndexID[i], i, VISITED_START_X - AUX_ARRAY_WIDTH , AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT);
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this.cmd("SetForegroundColor", this.visitedIndexID[i], VERTEX_INDEX_COLOR);
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this.cmd("CreateRectangle", this.parentID[i], "", AUX_ARRAY_WIDTH, AUX_ARRAY_HEIGHT, PARENT_START_X, AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT);
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this.cmd("CreateLabel", this.parentIndexID[i], i, PARENT_START_X - AUX_ARRAY_WIDTH , AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT);
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this.cmd("SetForegroundColor", this.parentIndexID[i], VERTEX_INDEX_COLOR);
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}
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this.cmd("CreateLabel", this.nextIndex++, "Parent", PARENT_START_X - AUX_ARRAY_WIDTH, AUX_ARRAY_START_Y - AUX_ARRAY_HEIGHT * 1.5, 0);
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this.cmd("CreateLabel", this.nextIndex++, "Visited", VISITED_START_X - AUX_ARRAY_WIDTH, AUX_ARRAY_START_Y - AUX_ARRAY_HEIGHT * 1.5, 0);
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this.cmd("CreateLabel", this.nextIndex++, "BFS Queue", QUEUE_START_X, QUEUE_START_Y - 30, 0);
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animationManager.setAllLayers([0, this.currentLayer]);
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animationManager.StartNewAnimation(this.commands);
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animationManager.skipForward();
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animationManager.clearHistory();
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this.highlightCircleL = this.nextIndex++;
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this.highlightCircleAL = this.nextIndex++;
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this.highlightCircleAM= this.nextIndex++
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}
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BFS.prototype.startCallback = function(event)
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{
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var startValue;
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if (this.startField.value != "")
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{
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startvalue = this.startField.value;
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this.startField.value = "";
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if (parseInt(startvalue) < this.size)
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this.implementAction(this.doBFS.bind(this),startvalue);
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}
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}
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BFS.prototype.doBFS = function(startVetex)
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{
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this.visited = new Array(this.size);
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this.commands = new Array();
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this.queue = new Array(this.size);
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var head = 0;
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var tail = 0;
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var queueID = new Array(this.size);
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var queueSize = 0;
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if (this.messageID != null)
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{
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for (var i = 0; i < this.messageID.length; i++)
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{
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this.cmd("Delete", this.messageID[i]);
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}
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}
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this.rebuildEdges();
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this.messageID = new Array();
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for (i = 0; i < this.size; i++)
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{
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this.cmd("SetText", this.visitedID[i], "f");
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this.cmd("SetText", this.parentID[i], "");
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this.visited[i] = false;
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queueID[i] = this.nextIndex++;
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}
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var vertex = parseInt(startVetex);
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this.visited[vertex] = true;
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this.queue[tail] = vertex;
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this.cmd("CreateLabel", queueID[tail], vertex, QUEUE_START_X + queueSize * QUEUE_SPACING, QUEUE_START_Y);
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queueSize = queueSize + 1;
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tail = (tail + 1) % (this.size);
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while (queueSize > 0)
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{
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vertex = this.queue[head];
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this.cmd("CreateHighlightCircle", this.highlightCircleL, HIGHLIGHT_CIRCLE_COLOR, this.x_pos_logical[vertex], this.y_pos_logical[vertex]);
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this.cmd("SetLayer", this.highlightCircleL, 1);
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this.cmd("CreateHighlightCircle", this.highlightCircleAL, HIGHLIGHT_CIRCLE_COLOR,this.adj_list_x_start - this.adj_list_width, this.adj_list_y_start + vertex*this.adj_list_height);
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this.cmd("SetLayer", this.highlightCircleAL, 2);
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this.cmd("CreateHighlightCircle", this.highlightCircleAM, HIGHLIGHT_CIRCLE_COLOR,this.adj_matrix_x_start - this.adj_matrix_width, this.adj_matrix_y_start + vertex*this.adj_matrix_height);
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this.cmd("SetLayer", this.highlightCircleAM, 3);
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this.cmd("SetTextColor", queueID[head], BFS_QUEUE_HEAD_COLOR);
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for (var neighbor = 0; neighbor < this.size; neighbor++)
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{
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if (this.adj_matrix[vertex][neighbor] > 0)
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{
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this.highlightEdge(vertex, neighbor, 1);
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this.cmd("SetHighlight", this.visitedID[neighbor], 1);
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this.cmd("Step");
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if (!this.visited[neighbor])
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{
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this.visited[neighbor] = true;
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this.cmd("SetText", this.visitedID[neighbor], "T");
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this.cmd("SetText", this.parentID[neighbor], vertex);
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this.highlightEdge(vertex, neighbor, 0);
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this.cmd("Disconnect", this.circleID[vertex], this.circleID[neighbor]);
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this.cmd("Connect", this.circleID[vertex], this.circleID[neighbor], BFS_TREE_COLOR, this.curve[vertex][neighbor], 1, "");
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this.queue[tail] = neighbor;
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this.cmd("CreateLabel", queueID[tail], neighbor, QUEUE_START_X + queueSize * QUEUE_SPACING, QUEUE_START_Y);
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tail = (tail + 1) % (this.size);
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queueSize = queueSize + 1;
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}
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else
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{
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this.highlightEdge(vertex, neighbor, 0);
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}
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this.cmd("SetHighlight", this.visitedID[neighbor], 0);
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this.cmd("Step");
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}
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}
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this.cmd("Delete", queueID[head]);
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head = (head + 1) % (this.size);
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queueSize = queueSize - 1;
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for (i = 0; i < queueSize; i++)
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{
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var nextQueueIndex = (i + head) % this.size;
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this.cmd("Move", queueID[nextQueueIndex], QUEUE_START_X + i * QUEUE_SPACING, QUEUE_START_Y);
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}
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this.cmd("Delete", this.highlightCircleL);
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this.cmd("Delete", this.highlightCircleAM);
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this.cmd("Delete", this.highlightCircleAL);
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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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BFS.prototype.reset = function()
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{
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// Throw an error?
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}
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BFS.prototype.enableUI = function(event)
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{
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this.startField.disabled = false;
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this.startButton.disabled = false;
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this.startButton
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BFS.superclass.enableUI.call(this,event);
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}
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BFS.prototype.disableUI = function(event)
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{
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this.startField.disabled = true;
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this.startButton.disabled = true;
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BFS.superclass.disableUI.call(this, event);
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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 BFS(animManag, canvas.width, canvas.height);
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}
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