// 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 AUX_ARRAY_WIDTH = 25; var AUX_ARRAY_HEIGHT = 25; var AUX_ARRAY_START_Y = 50; var VISITED_START_X = 475; var PARENT_START_X = 400; var HIGHLIGHT_CIRCLE_COLOR = "#000000"; var DFS_TREE_COLOR = "#0000FF"; var BFS_QUEUE_HEAD_COLOR = "#0000FF"; var QUEUE_START_X = 30; var QUEUE_START_Y = 50; var QUEUE_SPACING = 30; function DFS(am) { this.init(am); } DFS.prototype = new Graph(); DFS.prototype.constructor = DFS; DFS.superclass = Graph.prototype; DFS.prototype.addControls = function() { addLabelToAlgorithmBar("Start Vertex: "); this.startField = addControlToAlgorithmBar("Text", ""); this.startField.onkeydown = this.returnSubmit(this.startField, this.startCallback.bind(this), 2, true); this.startButton = addControlToAlgorithmBar("Button", "Run DFS"); this.startButton.onclick = this.startCallback.bind(this); DFS.superclass.addControls.call(this); } DFS.prototype.init = function(am, w, h) { showEdgeCosts = false; DFS.superclass.init.call(this, am, w, h); // TODO: add no edge label flag to this? // Setup called in base class constructor } DFS.prototype.setup = function() { DFS.superclass.setup.call(this); this.messageID = new Array(); this.commands = new Array(); this.visitedID = new Array(this.size); this.visitedIndexID = new Array(this.size); this.parentID = new Array(this.size); this.parentIndexID = new Array(this.size); for (var i = 0; i < this.size; i++) { this.visitedID[i] = this.nextIndex++; this.visitedIndexID[i] = this.nextIndex++; this.parentID[i] = this.nextIndex++; this.parentIndexID[i] = this.nextIndex++; this.cmd("CreateRectangle", this.visitedID[i], "f", AUX_ARRAY_WIDTH, AUX_ARRAY_HEIGHT, VISITED_START_X, AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT); this.cmd("CreateLabel", this.visitedIndexID[i], i, VISITED_START_X - AUX_ARRAY_WIDTH , AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT); this.cmd("SetForegroundColor", this.visitedIndexID[i], VERTEX_INDEX_COLOR); this.cmd("CreateRectangle", this.parentID[i], "", AUX_ARRAY_WIDTH, AUX_ARRAY_HEIGHT, PARENT_START_X, AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT); this.cmd("CreateLabel", this.parentIndexID[i], i, PARENT_START_X - AUX_ARRAY_WIDTH , AUX_ARRAY_START_Y + i*AUX_ARRAY_HEIGHT); this.cmd("SetForegroundColor", this.parentIndexID[i], VERTEX_INDEX_COLOR); } this.cmd("CreateLabel", this.nextIndex++, "Parent", PARENT_START_X - AUX_ARRAY_WIDTH, AUX_ARRAY_START_Y - AUX_ARRAY_HEIGHT * 1.5, 0); this.cmd("CreateLabel", this.nextIndex++, "Visited", VISITED_START_X - AUX_ARRAY_WIDTH, AUX_ARRAY_START_Y - AUX_ARRAY_HEIGHT * 1.5, 0); this.animationManager.setAllLayers([0, this.currentLayer]); this.animationManager.StartNewAnimation(this.commands); this.animationManager.skipForward(); this.animationManager.clearHistory(); this.highlightCircleL = this.nextIndex++; this.highlightCircleAL = this.nextIndex++; this.highlightCircleAM= this.nextIndex++ } DFS.prototype.startCallback = function(event) { var startValue; if (this.startField.value != "") { startvalue = this.startField.value; this.startField.value = ""; if (parseInt(startvalue) < this.size) this.implementAction(this.doDFS.bind(this),startvalue); } } DFS.prototype.doDFS = function(startVetex) { this.visited = new Array(this.size); this.commands = new Array(); if (this.messageID != null) { for (var i = 0; i < this.messageID.length; i++) { this.cmd("Delete", this.messageID[i]); } } this.rebuildEdges(); this.messageID = new Array(); for (i = 0; i < this.size; i++) { this.cmd("SetText", this.visitedID[i], "f"); this.cmd("SetText", this.parentID[i], ""); this.visited[i] = false; } var vertex = parseInt(startVetex); this.cmd("CreateHighlightCircle", this.highlightCircleL, HIGHLIGHT_CIRCLE_COLOR, this.x_pos_logical[vertex], this.y_pos_logical[vertex]); this.cmd("SetLayer", this.highlightCircleL, 1); 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); this.cmd("SetLayer", this.highlightCircleAL, 2); 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); this.cmd("SetLayer", this.highlightCircleAM, 3); this.messageY = 30; this.dfsVisit(vertex, 10); this.cmd("Delete", this.highlightCircleL); this.cmd("Delete", this.highlightCircleAL); this.cmd("Delete", this.highlightCircleAM); return this.commands } DFS.prototype.dfsVisit = function(startVertex, messageX) { var nextMessage = this.nextIndex++; this.messageID.push(nextMessage); this.cmd("CreateLabel",nextMessage, "DFS(" + String(startVertex) + ")", messageX, this.messageY, 0); this.messageY = this.messageY + 20; if (!this.visited[startVertex]) { this.visited[startVertex] = true; this.cmd("SetText", this.visitedID[startVertex], "T"); this.cmd("Step"); for (var neighbor = 0; neighbor < this.size; neighbor++) { if (this.adj_matrix[startVertex][neighbor] > 0) { this.highlightEdge(startVertex, neighbor, 1); this.cmd("SetHighlight", this.visitedID[neighbor], 1); if (this.visited[neighbor]) { nextMessage = this.nextIndex; this.cmd("CreateLabel", nextMessage, "Vertex " + String(neighbor) + " already visited.", messageX, this.messageY, 0); } this.cmd("Step"); this.highlightEdge(startVertex, neighbor, 0); this.cmd("SetHighlight", this.visitedID[neighbor], 0); if (this.visited[neighbor]) { this.cmd("Delete", nextMessage); } if (!this.visited[neighbor]) { this.cmd("Disconnect", this.circleID[startVertex], this.circleID[neighbor]); this.cmd("Connect", this.circleID[startVertex], this.circleID[neighbor], DFS_TREE_COLOR, this.curve[startVertex][neighbor], 1, ""); this.cmd("Move", this.highlightCircleL, this.x_pos_logical[neighbor], this.y_pos_logical[neighbor]); this.cmd("Move", this.highlightCircleAL, this.adj_list_x_start - this.adj_list_width, this.adj_list_y_start + neighbor*this.adj_list_height); this.cmd("Move", this.highlightCircleAM, this.adj_matrix_x_start - this.adj_matrix_width, this.adj_matrix_y_start + neighbor*this.adj_matrix_height); this.cmd("SetText", this.parentID[neighbor], startVertex); this.cmd("Step"); this.dfsVisit(neighbor, messageX + 20); nextMessage = this.nextIndex; this.cmd("CreateLabel", nextMessage, "Returning from recursive call: DFS(" + String(neighbor) + ")", messageX + 20, this.messageY, 0); this.cmd("Move", this.highlightCircleAL, this.adj_list_x_start - this.adj_list_width, this.adj_list_y_start + startVertex*this.adj_list_height); this.cmd("Move", this.highlightCircleL, this.x_pos_logical[startVertex], this.y_pos_logical[startVertex]); this.cmd("Move", this.highlightCircleAM, this.adj_matrix_x_start - this.adj_matrix_width, this.adj_matrix_y_start + startVertex*this.adj_matrix_height); this.cmd("Step"); this.cmd("Delete", nextMessage); } this.cmd("Step"); } } } } // NEED TO OVERRIDE IN PARENT DFS.prototype.reset = function() { // Throw an error? } DFS.prototype.enableUI = function(event) { this.startField.disabled = false; this.startButton.disabled = false; this.startButton DFS.superclass.enableUI.call(this,event); } DFS.prototype.disableUI = function(event) { this.startField.disabled = true; this.startButton.disabled = true; DFS.superclass.disableUI.call(this, event); } var currentAlg; function init() { var animManag = initCanvas(); currentAlg = new DFS(animManag, canvas.width, canvas.height); }