import javax.swing.*;
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Line2D;
import java.util.Random;

public class Drawing extends JPanel implements KeyListener,Runnable
{
	public static JFrame frame;
	public static JLabel label;
	public static int[] x=new int[20];
	public static int[] y=new int[20];
	public static int a;
	public static Random random;
	public static int p_x=0;
	public static int p_y=0;
	public static int enemy_stop=0;
	public static boolean isin=false;
	public static Thread move;
	public static Rectangle active;
	public static Rectangle[] generated=new Rectangle[20];
	public static boolean ready=false;
	public static int con;
	
	public static void drawframe(int width,int height)
	{		
		frame=new JFrame("The game");
		frame.setLayout(new BorderLayout());
		frame.setSize(width,height);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		frame.setResizable(false);
	}
	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		
		drawenemies(g,5);
		setradius(g);
		setplayer(g);
		
			if(entered()&&isin!=true)
			{
				isin=true;
				move=new Thread(new Drawing());
				move.start();
			}
			
			if(entered()==false&&isin==true)
				isin=false;
			
				for(int i=1;i<=a;i++)
				{
				Line2D left = new Line2D.Double(x[i], y[i]+5, x[i]-150, y[i]+5);
				Line2D right = new Line2D.Double(x[i], y[i]+5, x[i]+150, y[i]+5);
				
				g.setColor(Color.BLUE);
				
				if(p_y==y[i])
				{
					if(p_x>x[i])
						g.drawLine((int)right.getX1(),(int)right.getY1(),(int)right.getX2(),(int)right.getY2());
					
				     else
				    	 g.drawLine((int)left.getX1(),(int)left.getY1(),(int)left.getX2(),(int)left.getY2());
			    }
		   }
	   
	}
	
	public void drawenemies(Graphics g,int amount)
	{
		random=new Random();
		a=amount;
		enemy_stop=enemy_stop+1;
		
		if(enemy_stop<=1)
		{
			for(int i=1;i<=amount;i++)
			{
				x[i]=random.nextInt(frame.getWidth());
			    y[i]=random.nextInt(frame.getHeight());
			}
		}	
				
		for(int i=1;i<=amount;i++)
		{	
			g.fillRect(x[i], y[i], 20, 20);
			Rectangle store=new Rectangle(x[i], y[i], 20, 20);
			generated[i]=store;
		}
	}
	
	public void setradius(Graphics g)
	{
		g.setColor(Color.RED);
		
		for(int i=1;i<=a;i++)
		{
			g.drawRect(x[i]-40, y[i]-40, 100, 100);
		}
	}
	
	public void setplayer(Graphics g)
	{
		g.setColor(Color.GREEN);
		g.fillRect(p_x, p_y, 20, 20);
	    g.setColor(Color.BLACK);
		g.drawRect(p_x, p_y, 20, 20);
	}
	
	public static void main(String args[])
	{	
		drawframe(500,500);
		Drawing instance=new Drawing();
		frame.add(instance);
		frame.addKeyListener(instance);
		
	}
	
	public boolean entered()
	{
		boolean entered=false;
		
		for(int i=1;i<=a;i++)
		{
			Rectangle q=new Rectangle(x[i]-40, y[i]-40, 100, 100);
			Rectangle s=new Rectangle(p_x, p_y, 20, 20);
			
			if(q.contains(s))
			{
				entered=true;
				active=new Rectangle(x[i], y[i], 20, 20);
			}
		}
		
		return entered;
	}

	@Override
	public void keyPressed(KeyEvent e) 
	{
		switch(e.getKeyCode())
		{
		case 39: p_x=p_x+10;repaint();break;
		case 37: p_x=p_x-10;repaint();break;
		case 38: p_y=p_y-10;repaint();break;
		case 40: p_y=p_y+10;repaint();break;
		}
	}
		
	public void keyReleased(KeyEvent arg0){}
	public void keyTyped(KeyEvent arg0){}

	@Override
	public void run() 
	{
		try
		{
			
		for(int i=1;i<=a;i++)
		{
			if(active.getX()==generated[i].getX())
			{
				con=i;
				
				while(x[i]!=p_x||y[i]!=p_y)
				{
					if(x[i]>p_x)
						x[i]=x[i]-1;
					else
						x[i]=x[i]+1;
					
					if(y[i]>p_y)
						y[i]=y[i]-1;
					else
						y[i]=y[i]+1;
					
					Thread.sleep(100);
					frame.repaint();
				}
			}
		}
	}
	catch(InterruptedException e){}
  }
}