// 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 <COPYRIGHT HOLDER> ``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 <COPYRIGHT HOLDER> 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

// TODO: UNDO (all the way) is BROKEN. Redo reset ...


function Graph(am, w, h, dir, dag)
{
	if (am == undefined)
	{
		return;
	}
	this.init(am, w, h, dir,dag);
}

Graph.prototype = new Algorithm();
Graph.prototype.constructor = Graph;
Graph.superclass = Algorithm.prototype;

var LARGE_ALLOWED = [[false, true, true, false, true, false, false, true, false, false, false, false, false, false, true, false, false, false],
									[true, false, true, false, true, true, false, false, false, false, false, false, false, false, false, false, false, false],
									[true, true, false, true, false, true, true, false, false, false, false, false, false, false, false, false, false, false],
									[false, false, true, false, false,false, true, false, false, false, true, false, false, false, false, false, false, true],
									[true, true, false, false, false, true, false, true, true, false, false, false, false, false, false, false, false, false],
									[false, true, true, false, true, false, true, false, true, true, false, false, false, false, false, false, false, false],
									[false, false, true, true, false, true, false, false, false, true, true, false, false, false, false, false, false, false],
									[true, false, false, false, true, false, false, false, true, false, false, true, false, false, true, false, false, false],
									[false, false, false, false, true, true, false, true, false, true, false, true, true, false, false, false, false, false],
									[false, false, false, false, false, true, true, false, true, false, true, false, true, true, false, false, false, false],
									[false, false, false, true, false, false, true, false, false, true, false, false, false, true, false, false, false, true],
									[false, false, false, false, false, false, false, true, true, false, false, false, true, false, true, true, false, false],
									[false, false, false, false, false, false, false, false, true, true, false, true, false, true, false, true, true, false],
									[false, false, false, false, false, false, false, false, false, true, true, false, true, false, false, false, true, true],
									[false, false, false, false, false, false, false, true, false, false, false, true, false, false, false, true, false, false],
									[false, false, false, false, false, false, false, false, false, false, false, true, true, false, true, false, true, true],
									[false, false, false, false, false, false, false, false, false, false, false, false, true, true, false, true, false, true],
									[false, false, false, false, false, false, false, false, false, false, true, false, false, true, false, true, true, false]];

var LARGE_CURVE = [[0, 0, -0.4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.25, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0.4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -0.25],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [-0.25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.4],
								 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, 0.25, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -0.4, 0, 0]]



var LARGE_X_POS_LOGICAL = [600, 700, 800, 900,
										 650, 750, 850,
										 600, 700, 800, 900,
										 650, 750, 850,
										 600, 700, 800, 900];


var LARGE_Y_POS_LOGICAL = [50, 50, 50, 50,
										 150, 150, 150,
										 250, 250, 250, 250, 
										 350, 350, 350, 
										 450, 450, 450, 450];


var SMALL_ALLLOWED = [[false, true, true, true, true, false, false, false],
									 [true, false, true, true, false, true, true, false],
									 [true, true, false, false, true, true, true, false],
									 [true, true, false, false, false, true, false, true],
									 [true, false, true, false, false, false, true, true],
									 [false, true, true, true, false, false, true, true],
									 [false, true, true, false, true, true, false, true],
									 [false, false, false, true, true, true, true, false]];

var SMALL_CURVE = [[0, 0.001, 0, 0.5, -0.5, 0, 0, 0],
								 [0, 0, 0, 0.001, 0, 0.001, -0.2, 0],
								 [0, 0.001, 0, 0, 0, 0.2, 0, 0],
								 [-0.5, 0, 0, 0, 0, 0.001, 0, 0.5],
								 [0.5, 0, 0, 0, 0, 0, 0, -0.5],
								 [0, 0, -0.2, 0, 0, 0, 0.001, 0.001],
								 [0, 0.2, 0, 0, 0, 0, 0, 0],
								 [0, 0, 0, -0.5, 0.5, 0, 0, 0]]

var SMALL_X_POS_LOGICAL = [800, 725, 875, 650, 950, 725, 875, 800];
var SMALL_Y_POS_LOGICAL = [25, 125, 125, 225, 225, 325, 325, 425];


var SMALL_ADJ_MATRIX_X_START = 700;
var SMALL_ADJ_MATRIX_Y_START = 40;
var SMALL_ADJ_MATRIX_WIDTH = 30;
var SMALL_ADJ_MATRIX_HEIGHT = 30;

var SMALL_ADJ_LIST_X_START = 600;
var SMALL_ADJ_LIST_Y_START = 30;

var SMALL_ADJ_LIST_ELEM_WIDTH = 50;
var SMALL_ADJ_LIST_ELEM_HEIGHT = 30;

var SMALL_ADJ_LIST_HEIGHT = 36;
var SMALL_ADJ_LIST_WIDTH = 36;

var SMALL_ADJ_LIST_SPACING = 10;


var LARGE_ADJ_MATRIX_X_START = 575;
var LARGE_ADJ_MATRIX_Y_START = 30;
var LARGE_ADJ_MATRIX_WIDTH = 23;
var LARGE_ADJ_MATRIX_HEIGHT = 23;

var LARGE_ADJ_LIST_X_START = 600;
var LARGE_ADJ_LIST_Y_START = 30;

var LARGE_ADJ_LIST_ELEM_WIDTH = 50;
var LARGE_ADJ_LIST_ELEM_HEIGHT = 26;

var LARGE_ADJ_LIST_HEIGHT = 30;
var LARGE_ADJ_LIST_WIDTH = 30;

var LARGE_ADJ_LIST_SPACING = 10;



var VERTEX_INDEX_COLOR ="#0000FF";
var EDGE_COLOR = "#000000";

var SMALL_SIZE = 8;
var LARGE_SIZE = 18;

var HIGHLIGHT_COLOR = "#0000FF";





Graph.prototype.init = function(am, w, h, directed, dag)
{
	directed = (directed == undefined) ? true : directed;
	dag = (dag == undefined) ? false : dag;

	Graph.superclass.init.call(this, am, w, h);
	this.nextIndex = 0;
	
	this.currentLayer = 1;
	this.isDAG = dag;
	this.directed = directed;
	this.currentLayer = 1;
	this.addControls();
 
	this.setup_small();
}

Graph.prototype.addControls = function(addDirection)
{
	if (addDirection == undefined)
	{
		addDirection = true;
	}
	this.newGraphButton = addControlToAlgorithmBar("Button", "New Graph");
	this.newGraphButton.onclick = this.newGraphCallback.bind(this);

	if (addDirection)
	{
		var radioButtonList = addRadioButtonGroupToAlgorithmBar(["Directed Graph", "Undirected Graph"], "GraphType");
		this.directedGraphButton = radioButtonList[0];
		this.directedGraphButton.onclick = this.directedGraphCallback.bind(this, true);
		this.undirectedGraphButton = radioButtonList[1];
		this.undirectedGraphButton.onclick = this.directedGraphCallback.bind(this, false);
		this.directedGraphButton.checked = this.directed;
		this.undirectedGraphButton.checked = !this.directed;
	}
	

	var radioButtonList = addRadioButtonGroupToAlgorithmBar(["Small Graph", "Large Graph"], "GraphSize");
	this.smallGraphButton = radioButtonList[0];
	this.smallGraphButton.onclick = this.smallGraphCallback.bind(this);
	this.largeGraphButton = radioButtonList[1];
	this.largeGraphButton.onclick = this.largeGraphCallback.bind(this);
	this.smallGraphButton.checked = true;
	
	var radioButtonList = addRadioButtonGroupToAlgorithmBar(["Logical Representation", 
															 "Adjacency List Representation", 
															 "Adjacency Matrix Representation"
															], 
															"GraphRepresentation");
	this.logicalButton = radioButtonList[0];
	this.logicalButton.onclick = this.graphRepChangedCallback.bind(this,1);
	this.adjacencyListButton = radioButtonList[1];
	this.adjacencyListButton.onclick = this.graphRepChangedCallback.bind(this,2);
	this.adjacencyMatrixButton = radioButtonList[2];
	this.adjacencyMatrixButton.onclick = this.graphRepChangedCallback.bind(this,3);
	this.logicalButton.checked = true;
	
}

Graph.prototype.directedGraphCallback = function (newDirected, event)
{
	if (newDirected != this.directed)
	{
		this.directed =newDirected;
		this.animationManager.resetAll();
		this.setup();
	}
}



Graph.prototype.smallGraphCallback = function (event)
{
	if (this.size != SMALL_SIZE)
	{
		this.animationManager.resetAll();
		this.setup_small();		
	}
}

Graph.prototype.largeGraphCallback = function (event)
{
	if (this.size != LARGE_SIZE)
	{
		this.animationManager.resetAll();
		this.setup_large();		
	}	
}


Graph.prototype.newGraphCallback = function(event)
{
	this.animationManager.resetAll();
	this.setup();			
}



Graph.prototype.graphRepChangedCallback = function(newLayer, event) 
{
	this.animationManager.setAllLayers([0,newLayer]);
	this.currentLayer = newLayer;
}


Graph.prototype.recolorGraph = function()
{
	for (var i = 0; i < this.size; i++)
	{
		for (var j = 0; j < this.size; j++)
		{
			if (this.adj_matrix[i][j] >= 0)
			{
				this.setEdgeColor(i, j, EDGE_COLOR);				
			}
		}
	}
}		

Graph.prototype.highlightEdge = function(i,j, highlightVal)
{
	this.cmd("SetHighlight", this.adj_list_edges[i][j], highlightVal);
	this.cmd("SetHighlight", this.adj_matrixID[i][j], highlightVal);
	this.cmd("SetEdgeHighlight", this.circleID[i], this.circleID[j], highlightVal);		
	if (!this.directed)
	{
		this.cmd("SetEdgeHighlight", this.circleID[j], this.circleID[i], highlightVal);
	}
}

Graph.prototype.setEdgeColor = function(i,j, color)
{
	this.cmd("SetForegroundColor", this.adj_list_edges[i][j], color);
	this.cmd("SetTextColor", this.adj_matrixID[i][j], color);
	this.cmd("SetEdgeColor", this.circleID[i], this.circleID[j], color);		
	if (!this.directed)
	{
		this.cmd("SetEdgeColor", this.circleID[j], this.circleID[i], color);
	}
}



Graph.prototype.clearEdges = function()
{
	for (var i = 0; i < this.size; i++)
	{
		for (var j = 0; j < this.size; j++)
		{
			if (this.adj_matrix[i][j] >= 0)
			{
				this.cmd("Disconnect", this.circleID[i], this.circleID[j]);
			}
		}
	}
}


Graph.prototype.rebuildEdges = function()
{
	this.clearEdges();
	this.buildEdges();
}



Graph.prototype.buildEdges = function()
{
	
	for (var i = 0; i < this.size; i++)
	{
		for (var j = 0; j < this.size; j++)
		{
			if (this.adj_matrix[i][j] >= 0)
			{
				var edgeLabel;
				if (this.showEdgeCosts)
				{
					edgeLabel = String(this.adj_matrix[i][j]);
				}
				else
				{
					edgeLabel = "";
				}
				if (this.directed)
				{
					this.cmd("Connect", this.circleID[i], this.circleID[j], EDGE_COLOR, this.adjustCurveForDirectedEdges(this.curve[i][j], this.adj_matrix[j][i] >= 0), 1, edgeLabel);
				}
				else if (i < j)
				{
					this.cmd("Connect", this.circleID[i], this.circleID[j], EDGE_COLOR, this.curve[i][j], 0, edgeLabel);							
				}
			}
		}
	}
	
}

Graph.prototype.setup_small = function()
{
	this.allowed = SMALL_ALLLOWED;
	this.curve = SMALL_CURVE;
	this. x_pos_logical = SMALL_X_POS_LOGICAL;
	this. y_pos_logical = SMALL_Y_POS_LOGICAL;
	this.adj_matrix_x_start = SMALL_ADJ_MATRIX_X_START;
	this.adj_matrix_y_start = SMALL_ADJ_MATRIX_Y_START;
	this.adj_matrix_width = SMALL_ADJ_MATRIX_WIDTH;
	this.adj_matrix_height = SMALL_ADJ_MATRIX_HEIGHT;
	this.adj_list_x_start = SMALL_ADJ_LIST_X_START;
	this.adj_list_y_start = SMALL_ADJ_LIST_Y_START;
	this.adj_list_elem_width = SMALL_ADJ_LIST_ELEM_WIDTH;
	this.adj_list_elem_height = SMALL_ADJ_LIST_ELEM_HEIGHT;
	this.adj_list_height = SMALL_ADJ_LIST_HEIGHT;
	this.adj_list_width = SMALL_ADJ_LIST_WIDTH;
	this.adj_list_spacing = SMALL_ADJ_LIST_SPACING;
	this.size = SMALL_SIZE;
	this.setup();
}

Graph.prototype.setup_large = function()
{
	this.allowed = LARGE_ALLOWED;
	this.curve = LARGE_CURVE;
	this. x_pos_logical = LARGE_X_POS_LOGICAL;
	this. y_pos_logical = LARGE_Y_POS_LOGICAL;
	this.adj_matrix_x_start = LARGE_ADJ_MATRIX_X_START;
	this.adj_matrix_y_start = LARGE_ADJ_MATRIX_Y_START;
	this.adj_matrix_width = LARGE_ADJ_MATRIX_WIDTH;
	this.adj_matrix_height = LARGE_ADJ_MATRIX_HEIGHT;
	this.adj_list_x_start = LARGE_ADJ_LIST_X_START;
	this.adj_list_y_start = LARGE_ADJ_LIST_Y_START;
	this.adj_list_elem_width = LARGE_ADJ_LIST_ELEM_WIDTH;
	this.adj_list_elem_height = LARGE_ADJ_LIST_ELEM_HEIGHT;
	this.adj_list_height = LARGE_ADJ_LIST_HEIGHT;
	this.adj_list_width = LARGE_ADJ_LIST_WIDTH;
	this.adj_list_spacing = LARGE_ADJ_LIST_SPACING;
	this.size = LARGE_SIZE;
	this.setup();		
}

Graph.prototype.adjustCurveForDirectedEdges = function(curve, bidirectional)
{
	if (!bidirectional || Math.abs(curve) > 0.01)
	{
		return curve;
	}
	else
	{
		return 0.1;
	}
	
}

Graph.prototype.setup = function() 
{
	this.commands = new Array();
	this.circleID = new Array(this.size);
	for (var i = 0; i < this.size; i++)
	{
		this.circleID[i] = this.nextIndex++;
		this.cmd("CreateCircle", this.circleID[i], i, this. x_pos_logical[i], this. y_pos_logical[i]);
		this.cmd("SetTextColor", this.circleID[i], VERTEX_INDEX_COLOR, 0);
		
		this.cmd("SetLayer", this.circleID[i], 1);
	}
	
	this.adj_matrix = new Array(this.size);
	this.adj_matrixID = new Array(this.size);
	for (i = 0; i < this.size; i++)
	{
		this.adj_matrix[i] = new Array(this.size);
		this.adj_matrixID[i] = new Array(this.size);
	}
	
	var edgePercent;
	if (this.size == SMALL_SIZE)
	{
		if (this.directed)
		{
			edgePercent = 0.4;
		}
		else
		{
			edgePercent = 0.5;					
		}
		
	}
	else
	{
		if (this.directed)
		{
			edgePercent = 0.35;
		}
		else
		{
			edgePercent = 0.6;					
		}
		
	}
	
	var lowerBound = 0;
	
	if (this.directed)
	{
		for (i = 0; i < this.size; i++)
		{
			for (var j = 0; j < this.size; j++)
			{
				this.adj_matrixID[i][j] = this.nextIndex++;
				if ((this.allowed[i][j]) && Math.random() <= edgePercent && (i < j || Math.abs(this.curve[i][j]) < 0.01 || this.adj_matrixID[j][i] == -1) && (!this.isDAG || (i < j)))
				{
					if (this.showEdgeCosts)
					{
						this.adj_matrix[i][j] = Math.floor(Math.random()* 9) + 1;
					}
					else
					{
						this.adj_matrix[i][j] = 1;
					}
					
				}
				else
				{
					this.adj_matrix[i][j] = -1;
				}
				
			}				
		}
		this.buildEdges();
		
	}
	else
	{
		for (i = 0; i < this.size; i++)
		{
			for (j = i+1; j < this.size; j++)
			{
				
				this.adj_matrixID[i][j] = this.nextIndex++;
				this.adj_matrixID[j][i] = this.nextIndex++;
				
				if ((this.allowed[i][j]) && Math.random() <= edgePercent)
				{
					if (this.showEdgeCosts)
					{
						this.adj_matrix[i][j] = Math.floor(Math.random()* 9) + 1;
					}
					else
					{
						this.adj_matrix[i][j] = 1;
					}
					this.adj_matrix[j][i] = this.adj_matrix[i][j];
					if (this.showEdgeCosts)
					{
						var edgeLabel = String(this.adj_matrix[i][j]);
					}
					else
					{
						edgeLabel = "";
					}
					this.cmd("Connect", this.circleID[i], this.circleID[j], EDGE_COLOR, this.curve[i][j], 0, edgeLabel);
				}
				else
				{
					this.adj_matrix[i][j] = -1;
					this.adj_matrix[j][i] = -1;
				}
				
			}				
		}
		
		this.buildEdges();
		
		
		for (i=0; i < this.size; i++)
		{
			this.adj_matrix[i][i] = -1;
		}
		
	}
	
	
	// Craate Adj List

	
	this.buildAdjList();
	
	
	// Create Adj Matrix
	
	this.buildAdjMatrix();
	
	
	this.animationManager.setAllLayers([0, this.currentLayer]);
	this.animationManager.StartNewAnimation(this.commands);
	this.animationManager.skipForward();
	this.animationManager.clearHistory();
	this.clearHistory();
}

Graph.prototype.resetAll = function()
{
	
}


Graph.prototype.buildAdjMatrix = function()
{
	
	this.adj_matrix_index_x = new Array(this.size);
	this.adj_matrix_index_y = new Array(this.size);
	for (var i = 0; i < this.size; i++)
	{
		this.adj_matrix_index_x[i] = this.nextIndex++;
		this.adj_matrix_index_y[i] = this.nextIndex++;
		this.cmd("CreateLabel", this.adj_matrix_index_x[i], i, this.adj_matrix_x_start + i*this.adj_matrix_width, this.adj_matrix_y_start - this.adj_matrix_height);
		this.cmd("SetForegroundColor", this.adj_matrix_index_x[i], VERTEX_INDEX_COLOR);
		this.cmd("CreateLabel", this.adj_matrix_index_y[i], i, this.adj_matrix_x_start - this.adj_matrix_width, this.adj_matrix_y_start + i* this.adj_matrix_height);
		this.cmd("SetForegroundColor", this.adj_matrix_index_y[i], VERTEX_INDEX_COLOR);
		this.cmd("SetLayer", this.adj_matrix_index_x[i], 3);
		this.cmd("SetLayer", this.adj_matrix_index_y[i], 3);
		
		for (var j = 0; j < this.size; j++)
		{
			this.adj_matrixID[i][j] = this.nextIndex++;
			if (this.adj_matrix[i][j] < 0)
			{
				var lab = ""						
			}
			else
			{
				lab = String(this.adj_matrix[i][j])
			}
			this.cmd("CreateRectangle", this.adj_matrixID[i][j], lab, this.adj_matrix_width, this.adj_matrix_height, 
				this.adj_matrix_x_start + j*this.adj_matrix_width,this.adj_matrix_y_start + i * this.adj_matrix_height);
			this.cmd("SetLayer", this.adj_matrixID[i][j], 3);
			
			
		}				
	}
}



Graph.prototype.removeAdjList = function()
{
	for (var i = 0; i < this.size; i++)
	{
		this.cmd("Delete", this.adj_list_list[i], "RAL1");
		this.cmd("Delete", this.adj_list_index[i], "RAL2");
		for (var j = 0; j < this.size; j++)
		{
			if (this.adj_matrix[i][j] > 0)
			{
				this.cmd("Delete", this.adj_list_edges[i][j], "RAL3");
			}	
		}
	}
	
}


Graph.prototype.buildAdjList = function()
{					
	this.adj_list_index = new Array(this.size);
	this.adj_list_list = new Array(this.size);
	this.adj_list_edges = new Array(this.size);
	
	for (var i = 0; i < this.size; i++)
	{
		this.adj_list_index[i] = this.nextIndex++;
		this.adj_list_edges[i] = new Array(this.size);
		this.adj_list_index[i] = this.nextIndex++;
		this.adj_list_list[i] = this.nextIndex++;
		this.cmd("CreateRectangle", this.adj_list_list[i], "", this.adj_list_width, this.adj_list_height, this.adj_list_x_start, this.adj_list_y_start + i*this.adj_list_height);
		this.cmd("SetLayer", this.adj_list_list[i], 2);
		this.cmd("CreateLabel", this.adj_list_index[i], i, this.adj_list_x_start - this.adj_list_width , this.adj_list_y_start + i*this.adj_list_height);
		this.cmd("SetForegroundColor", this.adj_list_index[i], VERTEX_INDEX_COLOR);
		this.cmd("SetLayer", this.adj_list_index[i], 2);
		var lastElem = this.adj_list_list[i];
		var nextXPos = this.adj_list_x_start + this.adj_list_width + this.adj_list_spacing;
		var hasEdges = false;
		for (var j = 0; j < this.size; j++)
		{
			if (this.adj_matrix[i][j] > 0)
			{
				hasEdges = true;
				this.adj_list_edges[i][j] = this.nextIndex++;
				this.cmd("CreateLinkedList",this.adj_list_edges[i][j], j,this.adj_list_elem_width, this.adj_list_elem_height, 
					nextXPos, this.adj_list_y_start + i*this.adj_list_height, 0.25, 0, 1, 2);
				this.cmd("SetNull", this.adj_list_edges[i][j], 1);
				this.cmd("SetText", this.adj_list_edges[i][j], this.adj_matrix[i][j], 1); 
				this.cmd("SetTextColor", this.adj_list_edges[i][j], VERTEX_INDEX_COLOR, 0);
				this.cmd("SetLayer", this.adj_list_edges[i][j], 2);
				
				nextXPos = nextXPos + this.adj_list_elem_width + this.adj_list_spacing;
				this.cmd("Connect", lastElem, this.adj_list_edges[i][j]);
				this.cmd("SetNull", lastElem, 0);
				lastElem = this.adj_list_edges[i][j];						
			}	
		}
		if (!hasEdges)
		{
			this.cmd("SetNull", this.adj_list_list[i], 1);					
		}
	}
}




// NEED TO OVERRIDE IN PARENT
Graph.prototype.reset = function()
{
	// Throw an error?
}


Graph.prototype.disableUI = function(event)
{
	this.newGraphButton.disabled = true;
	if (this.directedGraphButton != null && this.directedGraphButton != undefined)
		this.directedGraphButton.disabled = true;
	if (this.undirectedGraphButton != null && this.undirectedGraphButton != undefined)
		this.undirectedGraphButton.disabled = true;
	this.smallGraphButton.disabled = true;
	this.largeGraphButton.disabled = true;
}



Graph.prototype.enableUI = function(event)
{
	
	this.newGraphButton.disabled = false;
	if (this.directedGraphButton != null && this.directedGraphButton != undefined)
		this.directedGraphButton.disabled = false;
	if (this.undirectedGraphButton != null && this.undirectedGraphButton != undefined)
		this.undirectedGraphButton.disabled = false;
	this.smallGraphButton.disabled = false;
	this.largeGraphButton.disabled = false;
}



/* no init, this is only a base class! */
 var currentAlg;
 function init()
 {
 var animManag = initCanvas();
 currentAlg = new Graph(animManag, canvas.width, canvas.height);
}