import java.awt.*;
import MainWin;

// This class is the information object. It display messages to the
// user and a height bar showing the tree height relative to a balance
// tree. 

public class InfoPanel extends Panel
{
   private MainWin   Parent;
   private TextField message;
   private Label     lb1;

   private Graphics  offGraphic;  // use for double buffering.
   private Image     offImage;

   // constructor create the object and initialize the component

   public InfoPanel(MainWin p)
   {
       Parent = p;
       setBackground(Color.red);
       message = new TextField(70);
       message.setEditable(false);
       lb1 = new Label("Info:");
      
       Font f = new Font("TimesRoman",Font.BOLD,16);
       message.setForeground(Color.blue);
       message.setFont(f);
       message.setBackground(new Color(180,180,180));
       lb1.setFont(f);
 
       setLayout(new FlowLayout(FlowLayout.LEFT,10,50));
       add(lb1);
       add(message);     
   } 

   // Since the Bar is drawn on the left side of the panel when the
   // window is resize we need to draw the bar again.
 
   public void paint(Graphics g)
   {
      drawBar();
   }

   // This method draw the bar on the left side of the panel.

   public void drawBar()
   {
      Graphics g;
      int num,height;
      int i; 

      g = getGraphics();
      num = Parent.tree.getNodes();      // the num of nodes and the height
      height = Parent.tree.getHeight();  // of the tree are neded for the
                                         // bar drawing.
      // I create evry time new image so if anyone change the size of
      // the window the drawing will change correspondingly.
    
      offImage = createImage(size().width,size().height);
      offGraphic = offImage.getGraphics();     
              
      offGraphic.setColor(Color.red);
      offGraphic.fillRect(0,0,size().width,size().height);

      offGraphic.setColor(new Color(180,180,180));
      offGraphic.fill3DRect(size().width-135,5,130,125,true);
      offGraphic.setColor(Color.black);
      offGraphic.setFont(new Font("TimesRoman",Font.BOLD,20));   
      offGraphic.drawString("Tree Depth",size().width-120,25);
      offGraphic.setFont(new Font("TimesRoman",Font.PLAIN,16));
      offGraphic.drawString("Balance   Current",size().width-130,120);

      if (num != 0)
      {
         offGraphic.setColor(Color.blue);
         offGraphic.fillRect(size().width-115,65,20,40);
         
         i = (int)(Math.floor((Math.log(num) / Math.log(2))+1));
         i = Math.round((float)(height*40)/(float)(i));
 
         offGraphic.setColor(Color.green);
         offGraphic.fillRect(size().width-50,105-i,20,i);
      }
      // painting the off image on the screen
      g.drawImage(offImage,0,0,this);
   }      

   // This message update the message in the info area.

   public void setMessage(String msg)
   {
      message.setText(msg);
   }        
}