/*
	A basic extension of the java.applet.Applet class
 */

import java.util.Vector;
import java.awt.*;
import java.applet.*;
import AntClasses.*;
import AntClasses.Csimulator; 
import AntClasses.SimResult;

/**
 * AntApplet is the Main viewable Class.
 * It is responsible for the Graphical User
 * Interface , And stands at Top of the hirarchy
 * 
 * @author Amir Schnider & Sharon Salmon
 * @version 1.0
 */

public class AntApplet extends Applet 
{

    /**
     * The simulator Object.
     * 
     * @see Csimulator
     */
    // graph information
    Csimulator sim = new Csimulator(1);
   
    int Prob=50; // probability for edges   
    int vertixes = 5; // number of vertices

    /**
     * The graph Object on which the Ant(s) is drawn.
     * 
     * @since 1999
     * @see Graph
     */
    Graph graph = new Graph(); // this object hold the information of the graph
    boolean isPaused = false; // flag conected to the pause button

    /**
     * Array of ants.
     * 
     * @since 1999
     * @see Ant
     */
	
    Ant ant[]; // array of graphic ants
      
	int m_fps = 100; // frames per second
	int nSleepTime = 1000 / m_fps;
	int m_Size = 7; // size of the ant
    int max_x,max_y,min_x,min_y;
    int NumOfAnts = 1; // the number of ants
    int Starts[] = {0,4};// the starting positions of the ants
    boolean IsRandom = true;
    Point lastEdge = null;     // the last edge that was drawn in "user mode"
        
    // double buffering image
    private Image m_image= null;// offscreen image
    private Graphics m_g = null; // associated graphics object
    Dimension m_dimImage; // size of offscreen image

    // backgroung image
    private Image bg_image;// offscreen image
    private Graphics bg_g; // associated graphics object
	
    int LastSelectedVertex = -1; // for "user mode" purposes
    Vector v;    // vector of the graph
    boolean SelectVertex = false; // flag for the "user mode" 
    // points for "user mode"
    Point Point1;
    Point Point2; 
    
    /**
	 * this function is called when the Applet is initialized.
	 * It Takes kare of all the initial look of the GUI,
	 * register Buttons,Labels & othe components,.
	 * And Initialize the Classes that are agregated in the Applet.
	 */
    
	public void init()
	{
	    
		// Take out this line if you don't use symantec.itools.net.RelativeURL or symantec.itools.awt.util.StatusScroller
	//	symantec.itools.lang.Context.setApplet(this);
	
		// This code is automatically generated by Visual Cafe when you add
		// components to the visual environment. It instantiates and initializes
		// the components. To modify the code, only use code syntax that matches
		// what Visual Cafe can generate, or Visual Cafe may be unable to back
		// parse your Java file into its visual environment.
		//{{INIT_CONTROLS
		setLayout(null);
		setBackground(new java.awt.Color(64,0,128));
		setSize(683,373);
		list1.addItem("Please Set The  Number");
		list1.addItem("Of Vertices And Push");
		list1.addItem("\" Draw Graph\",Then Push");
		list1.addItem("\"Start Ant\"");
		list1.addItem("Use \"User Defined \" to create your own");
		list1.addItem("Graph, Drag the mouse between Vertices ");
		list1.addItem("in order to add Edges.");
		list1.addItem("In \"Random Graph \" you can set the ");
		list1.addItem("probabilty for each edge with the spinner.");
		list1.setBackground(java.awt.Color.yellow);
		list1.setFont(new Font("Dialog", Font.BOLD, 14));
		add(list1);
		list1.setBounds(12,36,360,192);
		list1.setVisible(false);
		panel1.setLayout(null);
		add(panel1);
		panel1.setBackground(java.awt.Color.lightGray);
		panel1.setBounds(384,12,150,144);
		panel4.setLayout(null);
		panel1.add(panel4);
		panel4.setBackground(java.awt.Color.gray);
		panel4.setBounds(12,72,132,60);
		labelTime.setText("Time: 0");
		labelTime.setAlignment(java.awt.Label.CENTER);
		panel4.add(labelTime);
		labelTime.setBackground(java.awt.Color.white);
		labelTime.setFont(new Font("Dialog", Font.BOLD, 16));
		labelTime.setBounds(12,12,108,36);
		panel2.setLayout(null);
		panel1.add(panel2);
		panel2.setBackground(java.awt.Color.gray);
		panel2.setBounds(3,12,144,48);
		ButtonStartant.setLabel(">");
		ButtonStartant.setEnabled(false);
		panel2.add(ButtonStartant);
		ButtonStartant.setBackground(java.awt.Color.orange);
		ButtonStartant.setFont(new Font("Dialog", Font.BOLD, 14));
		ButtonStartant.setBounds(36,12,24,24);
		ButtonStop.setLabel("!");
		ButtonStop.setEnabled(false);
		panel2.add(ButtonStop);
		ButtonStop.setBackground(java.awt.Color.orange);
		ButtonStop.setFont(new Font("Dialog", Font.BOLD, 12));
		ButtonStop.setBounds(12,12,24,24);
		ButtonClear.setLabel("C");
		ButtonClear.setEnabled(false);
		panel2.add(ButtonClear);
		ButtonClear.setBackground(java.awt.Color.orange);
		ButtonClear.setFont(new Font("Dialog", Font.BOLD, 12));
		ButtonClear.setBounds(84,12,24,24);
		ButtonPause.setLabel("||");
		ButtonPause.setEnabled(false);
		panel2.add(ButtonPause);
		ButtonPause.setBackground(java.awt.Color.orange);
		ButtonPause.setFont(new Font("MonoSpaced", Font.BOLD, 12));
		ButtonPause.setBounds(60,12,24,24);
		ButtonDrawGraph.setLabel("@");
		panel2.add(ButtonDrawGraph);
		ButtonDrawGraph.setBackground(java.awt.Color.orange);
		ButtonDrawGraph.setFont(new Font("Dialog", Font.BOLD, 12));
		ButtonDrawGraph.setBounds(108,12,24,24);
		panel5.setLayout(null);
		add(panel5);
		panel5.setBackground(java.awt.Color.lightGray);
		panel5.setBounds(384,168,150,72);
		radioUser.setCheckboxGroup(Group2);
		radioUser.setLabel("User Defined ");
		panel5.add(radioUser);
		radioUser.setFont(new Font("Dialog", Font.PLAIN, 12));
		radioUser.setBounds(7,36,132,24);
		radioRandom.setCheckboxGroup(Group2);
		radioRandom.setState(true);
		radioRandom.setLabel("Random Graph");
		panel5.add(radioRandom);
		radioRandom.setBounds(7,12,108,16);
		panel6.setLayout(null);
		add(panel6);
		panel6.setBackground(java.awt.Color.lightGray);
		panel6.setBounds(540,12,140,228);
		panel6.add(ScrollProb);
		ScrollProb.setBounds(108,12,24,60);
		ScrollSpeed.setEnabled(false);
		panel6.add(ScrollSpeed);
		ScrollSpeed.setBounds(108,84,24,60);
		ScrollSpeed.setVisible(false);
		labelProb.setText("Prob: 50%");
		labelProb.setAlignment(java.awt.Label.CENTER);
		panel6.add(labelProb);
		labelProb.setBackground(java.awt.Color.yellow);
		labelProb.setFont(new Font("Dialog", Font.BOLD, 14));
		labelProb.setBounds(12,24,100,40);
		labelSpeed.setText("Speed: 30");
		labelSpeed.setAlignment(java.awt.Label.CENTER);
		labelSpeed.setEnabled(false);
		panel6.add(labelSpeed);
		labelSpeed.setBackground(java.awt.Color.yellow);
		labelSpeed.setFont(new Font("Dialog", Font.BOLD, 14));
		labelSpeed.setBounds(12,96,100,40);
		labelSpeed.setVisible(false);
		labelVertixes.setText("Vertices: 5");
		labelVertixes.setAlignment(java.awt.Label.CENTER);
		panel6.add(labelVertixes);
		labelVertixes.setBackground(java.awt.Color.yellow);
		labelVertixes.setFont(new Font("Dialog", Font.BOLD, 14));
		labelVertixes.setBounds(12,168,96,40);
		panel6.add(ScrollVertices);
		ScrollVertices.setBounds(108,156,24,60);
		labelHelp.setText("Help");
		labelHelp.setAlignment(java.awt.Label.CENTER);
		add(labelHelp);
		labelHelp.setBackground(java.awt.Color.orange);
		labelHelp.setFont(new Font("Dialog", Font.BOLD, 12));
		labelHelp.setBounds(5,5,48,24);
		buttonUndo.setLabel("  Undo");
		buttonUndo.setEnabled(false);
		add(buttonUndo);
		buttonUndo.setBackground(java.awt.Color.orange);
		buttonUndo.setFont(new Font("Dialog", Font.BOLD, 12));
		buttonUndo.setBounds(324,12,48,24);
		buttonUndo.setVisible(false);
		panel3.setLayout(null);
		add(panel3);
		panel3.setBackground(java.awt.Color.lightGray);
		panel3.setBounds(540,252,132,84);
		radioOneAnt.setCheckboxGroup(Group1);
		radioOneAnt.setState(true);
		radioOneAnt.setLabel("One Ant");
		panel3.add(radioOneAnt);
		radioOneAnt.setBounds(12,0,100,40);
		radioTwoAnts.setCheckboxGroup(Group1);
		radioTwoAnts.setLabel("Two Ants");
		panel3.add(radioTwoAnts);
		radioTwoAnts.setBounds(12,36,100,40);
		label1.setAlignment(java.awt.Label.CENTER);
		add(label1);
		label1.setBackground(java.awt.Color.pink);
		label1.setFont(new Font("Dialog", Font.BOLD|Font.ITALIC, 12));
		label1.setBounds(252,60,120,40);
		label1.setVisible(false);
		//}}
	                        
		sim.init(); // initialise the simulator
		min_x = min_y = 20;
	    max_x = max_y = 200;
	    // creating the background image which will be round circle
	    bg_image = createImage(600,500);
	    bg_g = bg_image.getGraphics();
	    DrawBackGround(bg_g);
	    ant = new Ant[2];
        for(int i = 0;i<2;i++)
        {
           ant[i] = new Ant(i);
	       add(ant[i]);
        }
		
	
		//{{REGISTER_LISTENERS
		SymAdjustment lSymAdjustment = new SymAdjustment();
		ScrollProb.addAdjustmentListener(lSymAdjustment);
		ScrollSpeed.addAdjustmentListener(lSymAdjustment);
		ScrollVertices.addAdjustmentListener(lSymAdjustment);
		SymMouse aSymMouse = new SymMouse();
		ButtonDrawGraph.addMouseListener(aSymMouse);
		ButtonStartant.addMouseListener(aSymMouse);
		ButtonStop.addMouseListener(aSymMouse);
		ButtonClear.addMouseListener(aSymMouse);
		this.addMouseListener(aSymMouse);
				
		SymMouseMotion aSymMouseMotion = new SymMouseMotion();
		this.addMouseMotionListener(aSymMouseMotion);
		SymItem lSymItem = new SymItem();
		radioUser.addItemListener(lSymItem);
		radioRandom.addItemListener(lSymItem);
		ButtonClear.addMouseMotionListener(aSymMouseMotion);
		ButtonPause.addMouseListener(aSymMouse);
		labelHelp.addMouseListener(aSymMouse);
		buttonUndo.addMouseListener(aSymMouse);
		SymFocus aSymFocus = new SymFocus();
		this.addFocusListener(aSymFocus);
		radioOneAnt.addItemListener(lSymItem);
		radioTwoAnts.addItemListener(lSymItem);
		//}}
	}
	
	//{{DECLARE_CONTROLS
	java.awt.List list1 = new java.awt.List(4);
	java.awt.Panel panel1 = new java.awt.Panel();
	java.awt.Panel panel4 = new java.awt.Panel();
	java.awt.Label labelTime = new java.awt.Label();
	java.awt.Panel panel2 = new java.awt.Panel();
	java.awt.Button ButtonStartant = new java.awt.Button();
	java.awt.Button ButtonStop = new java.awt.Button();
	java.awt.Button ButtonClear = new java.awt.Button();
	java.awt.Button ButtonPause = new java.awt.Button();
	java.awt.Button ButtonDrawGraph = new java.awt.Button();
	java.awt.Panel panel5 = new java.awt.Panel();
	java.awt.Checkbox radioUser = new java.awt.Checkbox();
	java.awt.CheckboxGroup Group2 = new java.awt.CheckboxGroup();
	java.awt.Checkbox radioRandom = new java.awt.Checkbox();
	java.awt.Panel panel6 = new java.awt.Panel();
	java.awt.Scrollbar ScrollProb = new java.awt.Scrollbar(Scrollbar.VERTICAL,50,1,0,100);
	java.awt.Scrollbar ScrollSpeed = new java.awt.Scrollbar(Scrollbar.VERTICAL,60,1,20,200);
	java.awt.Label labelProb = new java.awt.Label();
	java.awt.Label labelSpeed = new java.awt.Label();
	java.awt.Label labelVertixes = new java.awt.Label();
	java.awt.Scrollbar ScrollVertices = new java.awt.Scrollbar(Scrollbar.VERTICAL,5,1,5,15);
	java.awt.Label labelHelp = new java.awt.Label();
	java.awt.Button buttonUndo = new java.awt.Button();
	java.awt.Panel panel3 = new java.awt.Panel();
	java.awt.Checkbox radioOneAnt = new java.awt.Checkbox();
	java.awt.CheckboxGroup Group1 = new java.awt.CheckboxGroup();
	java.awt.Checkbox radioTwoAnts = new java.awt.Checkbox();
	java.awt.Label label1 = new java.awt.Label();
	//}}
	
	/**
     * This function is called when the Applet start or 
     * By update , And paints the Graph Area
     * 
     * @param g This is the Device Context on which the graph is been Drawn.
     */
	
	public void paint(Graphics g)
	{
        // repaint existing image
        if (m_image != null)
        {
            g.drawImage(m_image, 0, 0, null);
        }
	}
	
	/**
	 * This function is called whenever the Applet
	 * or one of its Component ask for repaint();
	 * It draws the Graph at the background ,than 
	 * call paint().
	 * This technique is called "double buffering"
	 * and it prevents flashing screen.
	 * 
	 * @param g Device Context for drawing.
	 * In this case it is for an BackGround image.
	 */
    public void update(Graphics g)
    {
        // make sure that the image is the same size as
        // the applet's window
        ResizeImage();
        // draws the background
        m_g.drawImage(bg_image,0,0,null);  
        for(int i = 0;i<NumOfAnts;i++)
        {
            if (ant[i].MovingHead == true || ant[i].Advancing == true)
            {   
                
            ant[i].DrawAnt(m_g);
            }
            else if(ant[i].Clear == false)           
                ant[i].DrawAnt(m_g,m_Size);
        }        
        paint(g);
    }

	/**
	 * this function is called when the stop Button is pushed.
	 * It stops the ants which are Threaded Components.
	 */
 	
	public void stop()
	{		
	    for(int i = 0;i<NumOfAnts;i++)
	    {
			ant[i].stop();
	    }
	}

    /**
     * Initilize the ant from outside.
     * connect it to the Graph on which it will be drawn.
     * connet it to simulator, which is common for all ants.
     * connect it to GUI components such as Buttons and labes,
     * And make some more initializations.
     * 
     * @param ant the Ant Class to be initialized.
     * @param StartVert
     */ 
    private void AntInit(Ant ant,int StartVert)
    { try
      {
        ant.m_image = m_image;
        ant.m_g = m_g;
        ant.bg_g = bg_g;
        ant.bg_image = bg_image;
        add(ant.labelVisits);
        ant.labelTime = labelTime;
        ant.ButtonClear = ButtonClear;
        ant.ButtonPause = ButtonPause;
        ant.ButtonStartant = ButtonStartant;
        ant.ButtonStop = ButtonStop;
        ant.sim = sim;
        ant.graph = graph;
        ant.SetSimStart(StartVert);        
      }catch(Exception e){System.out.println(e); } 
      ant.firstTime = true;
	  ant.nextVert = StartVert;
	  ant.dest =  new Direction(graph.GetVerTex(ant.StartVert).x ,graph.GetVerTex(ant.StartVert).y);
      ant.pos.Set(graph.GetVerTex(StartVert).x ,graph.GetVerTex(StartVert).y);
    }

    // ResizeImage - resize the off-screen image (if necessary)
    private void ResizeImage()
    {
        // get the size of the applet's window
        Dimension dim = getSize();// size();
        int nWidth = dim.width;
        int nHeight= dim.height;

        // compare that to the size of our image;
        // if it hasn't changed...
        if (m_dimImage != null &&
            m_dimImage.width == nWidth &&
            m_dimImage.height== nHeight)
        {
            // ...don't do anything
            return;
        }

        // create a graphics image to paint to
        m_dimImage = new Dimension(nWidth, nHeight);
        m_image = createImage(nWidth, nHeight);
        m_g = m_image.getGraphics();
    }

   /**
    * Draw the circle on which the Graph and the Ant(s) will be drawn.
    * 
    * @param mg Device Context on which the bacground is drawn
    */
   /// this function draws the background on which the ant is moving
    private void DrawBackGround(Graphics mg)
    {
        mg.setColor(Color.white);
        mg.fillRoundRect(graph.x_offset,graph.y_offset,(graph.x*2),(graph.y*2),(graph.x*2),(graph.y*2));
    }
    
 
//*******************************************************************
// All functions from here conected to the GUI
//*******************************************************

	class SymAdjustment implements java.awt.event.AdjustmentListener
	{
		public void adjustmentValueChanged(java.awt.event.AdjustmentEvent event)
		{
			Object object = event.getSource();
			if (object == ScrollProb)
				ScrollProb_AdjustmentValueChanged(event);
			else if (object == ScrollSpeed)
				ScrollSpeed_AdjustmentValueChanged(event);
			else if (object == ScrollVertices)
				ScrollVertices_AdjustmentValueChanged(event);
		}
	}

	/**
	 * Called when the "Probability ScrollBar" is changed
	 * 
	 * @param event
	 */

	void ScrollProb_AdjustmentValueChanged(java.awt.event.AdjustmentEvent event)
	{
		//m_Size=verticalScrollbar1.getValue();
		Prob=ScrollProb.getValue();
		labelProb.setText("  Prob: " + Prob+"%");
			 
	}

	/**
	 * Called when the "Speed ScrollBar" is changed
	 * 
	 * @param event
	 */

	void ScrollSpeed_AdjustmentValueChanged(java.awt.event.AdjustmentEvent event)
	{
		m_fps=ScrollSpeed.getValue();
		labelSpeed.setText("Speed: " + m_fps);
		nSleepTime = 1000 / m_fps;
			 
	}

	/**
	 * Called when the "Vertices ScrollBar" is changed
	 * 
	 * @param event
	 */

	void ScrollVertices_AdjustmentValueChanged(java.awt.event.AdjustmentEvent event)
	{
		vertixes = ScrollVertices.getValue();
		labelVertixes.setText("  Vertices :" + vertixes);
			 
	}

	class SymMouse extends java.awt.event.MouseAdapter
	{
		public void mouseExited(java.awt.event.MouseEvent event)
		{
			Object object = event.getSource();
			if (object == ButtonStop)
				ButtonStop_MouseExited(event);
			else if (object == ButtonStartant)
				ButtonStartant_MouseExited(event);
			else if (object == ButtonDrawGraph)
				ButtonDrawGraph_MouseExited(event);
			else if (object == ButtonPause)
				ButtonPause_MouseExited(event);
			else if (object == ButtonClear)
				ButtonClear_MouseExited(event);
			else if (object == labelHelp)
				labelHelp_MouseExited(event);
		}

		public void mouseEntered(java.awt.event.MouseEvent event)
		{
			Object object = event.getSource();
			if (object == ButtonStop)
				ButtonStop_MouseEntered(event);
			else if (object == ButtonStartant)
				ButtonStartant_MouseEntered(event);
			else if (object == ButtonClear)
				ButtonClear_MouseEntered(event);
			else if (object == ButtonPause)
				ButtonPause_MouseEntered(event);
			else if (object == ButtonDrawGraph)
				ButtonDrawGraph_MouseEntered(event);
			else if (object == labelHelp)
				labelHelp_MouseEntered(event);
		}

		public void mouseReleased(java.awt.event.MouseEvent event)
		{
			Object object = event.getSource();
			if (object == AntApplet.this)
				AntApplet_MouseReleased(event);
		}

		public void mousePressed(java.awt.event.MouseEvent event)
		{
			Object object = event.getSource();
			if (object == AntApplet.this)
				AntApplet_MousePressed(event);
		}

		public void mouseClicked(java.awt.event.MouseEvent event)
		{
			Object object = event.getSource();
			if (object == ButtonDrawGraph)
				ButtonDrawGraph_MouseClicked(event);
			else if (object == ButtonStartant)
				ButtonStartant_MouseClicked(event);
			else if (object == ButtonStop)
				ButtonStop_MouseClicked(event);
			else if (object == ButtonClear)
				ButtonClear_MouseClicked(event);
			if (object == ButtonPause)
				ButtonPause_MouseClicked(event);
			else if (object == buttonUndo)
				buttonUndo_MouseClicked(event);
			
		}
	}

	void ButtonDrawGraph_MouseClicked(java.awt.event.MouseEvent event)
	{
	    radioOneAnt.setEnabled(false);
	    radioTwoAnts.setEnabled(false);
	    for(int i = 0;i<NumOfAnts;i++)
	    {
	        ant[i].Clear = false;
	    }//ant2.Clear = false;
		list1.setVisible(false);
	    Point p1,p2;
	    int v1,v2;
	    
	    
	    graph.MakeGraph(vertixes);
	//	p1 = graph.GetVerTex(vertixes-1);
		if (IsRandom == true)
		    v=sim.BuildRandomGraph(vertixes, Prob);
		else 
		{
		    SelectVertex = true;
		    v=sim.BuildRandomGraph(vertixes, 0);
		}
		graph.v = v;
		graph.DrawGraph(bg_g);
		for(int i = 0;i<NumOfAnts;i++)
	    {
	        ant[i].Clear = false;
	        AntInit(ant[i],Starts[i]);
	        ant[i].SetPosition();
		}
		repaint();
		ButtonDrawGraph.setEnabled(false);
		ButtonStartant.setEnabled(true);
		ButtonClear.setEnabled(true);
	}

	void ButtonStartant_MouseClicked(java.awt.event.MouseEvent event)
	{
	    
	    SelectVertex = false;
		for(int i = 0;i<NumOfAnts;i++)
		{
		   ant[i].ClearTrack();
		   ant[i].start();
		}
	    ant[0].TrackColor = Color.blue ;
		ButtonPause.setEnabled(true);
		ButtonStop.setEnabled(true);
		ButtonClear.setEnabled(false);
		ButtonStartant.setEnabled(false);
		buttonUndo.setEnabled(false);
		//ant1.start();
		//ant2.start();
	}

	void ButtonStop_MouseClicked(java.awt.event.MouseEvent event)
	{
		stop();	
		ButtonStop.setEnabled(false);
		ButtonClear.setEnabled(true);
		ButtonStartant.setEnabled(false);
		ButtonPause.setEnabled(false);
		for (int i=0;i<NumOfAnts;i++)
		{
		    ant[i].labelVisits.setVisible(false);
		}//ant2.labelVisits.setVisible(false);
	}

	void ButtonClear_MouseClicked(java.awt.event.MouseEvent event)
	{
	    radioOneAnt.setEnabled(true);
	    radioTwoAnts.setEnabled(true);
	    OnClear();
	}

	void AntApplet_MousePressed(java.awt.event.MouseEvent event)
	{
	    if (SelectVertex == false) return;
	    LastSelectedVertex = graph.GetVerTexNum(new Point(event.getX(),event.getY()));
		if (LastSelectedVertex != -1)
		    Point1 = new Point(graph.GetVerTex(LastSelectedVertex));
	}

	void AntApplet_MouseReleased(java.awt.event.MouseEvent event)
	{
	    if (SelectVertex == false) return;
		int CurrentVertex = graph.GetVerTexNum(new Point(event.getX(),event.getY()));
	    
	    if ((CurrentVertex != LastSelectedVertex) && (LastSelectedVertex != -1) && (CurrentVertex != -1))
	    {
	        // remember for undo
	        lastEdge = new Point( CurrentVertex,LastSelectedVertex);
	        buttonUndo.setEnabled(true);
	        // add the edge
	       sim.AddNeighbor(sim.GetVertex(LastSelectedVertex) , sim.GetVertex(CurrentVertex)); 
	      // also add the opposite direction
	       sim.AddNeighbor(sim.GetVertex(CurrentVertex) , sim.GetVertex(LastSelectedVertex));
	       v.addElement(String.valueOf(LastSelectedVertex));
	       v.addElement(String.valueOf(CurrentVertex));
	       graph.v = v;
		   		   
	    }
	    if (Point2 != null && Point1!= null)
	    {
	        bg_g.setColor(Color.white);
	        bg_g.drawLine(Point1.x,Point1.y, Point2.x,Point2.y);
	    }
	    graph.DrawGraph(bg_g);
	    repaint();
	}

	

	class SymMouseMotion extends java.awt.event.MouseMotionAdapter
	{
		public void mouseDragged(java.awt.event.MouseEvent event)
		{
			Object object = event.getSource();
			if (object == AntApplet.this)
				AntApplet_MouseDragged(event);
		}
	}

	void AntApplet_MouseDragged(java.awt.event.MouseEvent event)
	{
	    if (SelectVertex == false) return;
	    if (!graph.InCircle(new Point(event.getX(),event.getY()))) return;    
	    
	    if (Point2 != null && Point1!= null)
	    {
	        bg_g.setColor(Color.white);
	        bg_g.drawLine(Point1.x,Point1.y, Point2.x,Point2.y);
	    }else if (Point1 != null && Point2==null)
	    {
	        Point2 = new Point();
	    }else if (Point1 == null && Point2 == null)
	    {
	        return;
	    }
	        bg_g.setColor(Color.black);
	        Point2.x = event.getX();
	        Point2.y = event.getY();
	        bg_g.drawLine(Point1.x,Point1.y, Point2.x,Point2.y);
	//	label5.setText(String.valueOf(x));
		    repaint();	 
		
	    
	}

	class SymItem implements java.awt.event.ItemListener
	{
		public void itemStateChanged(java.awt.event.ItemEvent event)
		{
			Object object = event.getSource();
			if (object == radioUser)
				radioUser_ItemStateChanged(event);
			else if (object == radioRandom)
				radioRandom_ItemStateChanged(event);
			else if (object == radioOneAnt)
				radioOneAnt_ItemStateChanged(event);
			else if (object == radioTwoAnts)
				radioTwoAnts_ItemStateChanged(event);
		}
	}

	void radioUser_ItemStateChanged(java.awt.event.ItemEvent event)
	{
	    IsRandom = false;
		labelProb.setVisible(false);
	    ScrollProb.setVisible(false);
	    OnClear();
	  //  ButtonDrawGraph.setLabel("Draw Circle");
		list1.setVisible(false);
		buttonUndo.setVisible(true);
	//	buttonUndo.enable();
	}

	void radioRandom_ItemStateChanged(java.awt.event.ItemEvent event)
	{
	    IsRandom = true;
		labelProb.setVisible(true);
		ScrollProb.setVisible(true);
	    OnClear();
	    buttonUndo.setVisible(false);
	  //  buttonUndo.disable();
		//ButtonDrawGraph.setLabel("Draw Graph");
			 
	}
	

	void ButtonPause_MouseClicked(java.awt.event.MouseEvent event)
	{
	    if (isPaused == false)
	    {
	        isPaused =true;
	        for (int i=0;i<NumOfAnts;i++)
		    {
		        ant[i].suspend();
		    }
		}
		else
		{
		    isPaused = false;
		    for (int i=0;i<NumOfAnts;i++)
		    {
		        ant[i].resume();
		    }		    
		}
	}

	/**
	 * Called when the "Clear" Button is pressed or when 
	 * changing selection betwen "user Defined" graph 
	 * and "Random " graph.
	 */
	private void OnClear()
    {
        sim.init();
        for (int i=0;i<NumOfAnts;i++)
		{
		    ant[i].Clear = true;
            ant[i].MovingHead = false;
	        ant[i].Advancing = false;
	 	}
	    list1.setVisible(false);
	    labelTime.setText("Time: 0");
	    SelectVertex = false;
		stop();
		DrawBackGround(bg_g);
		repaint();
		
		ButtonStartant.setEnabled(false);
		ButtonStop.setEnabled(false);
	    ButtonClear.setEnabled(false);
	    ButtonPause.setEnabled(false);
	    ButtonDrawGraph.setEnabled(true);
	    isPaused = false;
	 }


	void ButtonStop_MouseEntered(java.awt.event.MouseEvent event)
	{
	    label1.setVisible(true);
		label1.setText("Stop");
			 
	}

	void ButtonStop_MouseExited(java.awt.event.MouseEvent event)
	{
	    label1.setVisible(false);
	}

	void ButtonStartant_MouseEntered(java.awt.event.MouseEvent event)
	{
		label1.setVisible(true);
		label1.setText("Start Ant");			 
	}

	void ButtonStartant_MouseExited(java.awt.event.MouseEvent event)
	{
		label1.setVisible(false);
	}

	void ButtonClear_MouseEntered(java.awt.event.MouseEvent event)
	{
		label1.setVisible(true);
		label1.setText("Clear Graph.");	
	}

	void ButtonPause_MouseEntered(java.awt.event.MouseEvent event)
	{
		label1.setVisible(true);
		label1.setText("Pause");	
	}

	void ButtonDrawGraph_MouseEntered(java.awt.event.MouseEvent event)
	{
		label1.setVisible(true);
		label1.setText("Draw Graph");	
	}

	void ButtonDrawGraph_MouseExited(java.awt.event.MouseEvent event)
	{
		label1.setVisible(false);
	}

	void ButtonPause_MouseExited(java.awt.event.MouseEvent event)
	{
		label1.setVisible(false);
	}

	void ButtonClear_MouseExited(java.awt.event.MouseEvent event)
	{
		label1.setVisible(false);
	}

	void labelHelp_MouseEntered(java.awt.event.MouseEvent event)
	{
		list1.setVisible(true);			 
	}

	void labelHelp_MouseExited(java.awt.event.MouseEvent event)
	{
		list1.setVisible(false);
	}

	void buttonUndo_MouseClicked(java.awt.event.MouseEvent event)
	{
		buttonUndo.setEnabled(false);
		// remove the edge from the simulator 
		sim.RemoveNeighbor(sim.GetVertex(lastEdge.x),sim.GetVertex(lastEdge.y));
		sim.RemoveNeighbor(sim.GetVertex(lastEdge.y),sim.GetVertex(lastEdge.x));
	    // now graphicaly move the edge
	    Point Point1 = graph.GetVerTex(lastEdge.x);
	    Point Point2 = graph.GetVerTex(lastEdge.y);
	    bg_g.setColor(Color.white);
	    graph.DrawLine(bg_g,Point1,Point2);
	    int a = v.size() - 1;
	     v.removeElementAt(a);
	     v.removeElementAt(a-1);
	
	    graph.v = v;
	    graph.DrawGraph(bg_g);
	    repaint();
	}

	class SymFocus extends java.awt.event.FocusAdapter
	{
		public void focusGained(java.awt.event.FocusEvent event)
		{
			Object object = event.getSource();
			if (object == AntApplet.this)
				AntApplet_focusGained(event);
		}
	}

	void AntApplet_focusGained(java.awt.event.FocusEvent event)
	{
		// to do: code goes here.
	}

	void radioOneAnt_ItemStateChanged(java.awt.event.ItemEvent event)
	{
		NumOfAnts = 1;
		sim.SetAntNum(1);
	}

	void radioTwoAnts_ItemStateChanged(java.awt.event.ItemEvent event)
	{
		NumOfAnts = 2;
		sim.SetAntNum(2);		
	}
}