import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JPanel;
import javax.swing.JFrame;

public class TreeFractal extends JPanel implements MouseMotionListener
{
    public static int WIDTH=800;
    public static int HEIGHT=800;
    
    public  TreeFractal()
    {
        
        
    }
     public static void main(String[] args) {
		TreeFractal app= new TreeFractal();
		JFrame window = new JFrame("Tree Fractal");
		window.setSize(WIDTH, HEIGHT);
		window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		window.getContentPane().add(app);

		window.getContentPane().addMouseMotionListener(app);

		window.setVisible(true);

	}
    public void paintComponent (Graphics g) 
     {
         super.paintComponent(g); 
         drawTree(g,  getWidth()/2.0, getHeight()*.95, getHeight()/4.0, Math.PI/2.0);
     }

      public void drawTree(Graphics g, double x, double y, double len, double angle) 
      {
          if(len >2){

              double  nextX= x + len* Math.cos(angle);
              double  nextY= y -  len* Math.sin(angle);
              g.setColor(randColor());
              g.drawLine((int)Math.round(x),  (int)Math.round(y), 
                         (int)Math.round(nextX), (int)Math.round(nextY) );
              drawTree(g, nextX, nextY, len * 0.75, angle + Math.PI/6.0);
              drawTree(g, nextX, nextY, len * 0.66, angle - 5.0*Math.PI/18.0);

        }
      }
      /**
       * This is a random Color which favors browns and greens...
       */
      public Color randColor(){
          int r=32+(int)(Math.random()*128);
          int g=64+(int)(Math.random()*128);
          int b=16+(int)(Math.random()*64);
          return new Color(r,g,b);
      }
      /**
	 * These are the Methods needed to implement the MouseMotionListener Interface
	 */

	@Override
	public void mouseDragged(MouseEvent e) {

            repaint();
	}
	@Override
	public void mouseMoved(MouseEvent e) {
		
		repaint();
	}

}