import java.awt.*;
import java.awt.image.*;
import java.net.*;
import java.io.*;

public class Hulknurk extends Frame
{  int nurki = 4, ring=0, k, i, joonis;
	static int a, b;
	static double x0,y0;
	int[] x = new int[5];
	int[] y = new int[5];
	
   public Hulknurk()
   {  setTitle("Joonte Arvutaja");
      MenuBar mbar = new MenuBar();
      Menu m = new Menu("Algus");
      m.add(new MenuItem("Sisesta arvuliselt"));
      m.addSeparator();
      m.add(new MenuItem("Välju"));            
      mbar.add(m);
        
      m = new Menu("Aita");
      m.add(new MenuItem("Juhend"));
      m.add(new MenuItem("Autorilt"));
      mbar.add(m);
	
      setMenuBar(mbar);
   }   
	
	
   public boolean action(Event evt, Object arg)
   {  if (evt.target instanceof MenuItem)
      if(arg.equals("Sisesta arvuliselt"))
      {   Sisse2 ab2 = new Sisse2(this);
          ab2.show();
          for (k=1;k<nurki+1;k++)
          {	x[k] = ab2.nx[k];
          	y[k] = ab2.ny[k];
	       }
          
          Annap ab3 = new Annap();
          x[0] = (int)ab3.xx;
          y[0] = (int)ab3.yy;
          repaint();
      }
      else if(arg.equals("Juhend"))
      {   Juhis ab6 = new Juhis(this);
          ab6.show();
      }
      else if(arg.equals("Autorilt"))
      {   Autorilt ab7 = new Autorilt(this);
          ab7.show();
      }
      else if(arg.equals("Välju"))	
      {	 System.exit(0);
      }
      else return super.action(evt, arg);
      return true;
   }

   public void paint(Graphics g)
   {	if (joonis==100)
     	{	g.setColor(Color.black);
      	g.drawRect(4, 42, 400, 400); 
	 		g.drawLine(4, 242, 404, 242);
	 		g.drawLine(204, 42, 204, 442);
			g.setColor(Color.red);
	 		g.drawLine((204+(2*x[1])),(242-(2*y[1])),(204+(2*x[2])),(242-(2*y[2]))); 
	 		g.drawLine((204+(2*x[3])),(242-(2*y[3])),(204+(2*x[4])),(242-(2*y[4])));
			if (ring == 1)
			{	g.setColor(Color.blue);
				g.drawOval((199+(2*x[0])),(237+(2*y[0])),10,10);
				g.drawString("Sirged lõikuvad",4,454);
			}
			if (ring == 2)
			{	g.setColor(Color.blue);
				g.drawString("Sirged on paralleelsed",4,454);
			}	 
		}
	}

   public static void main(String arg[])
   {  Frame f = new Hulknurk();
      f.setLocation(100, 100);
      f.resize(410, 445);
      f.show();
	}            
	
   public boolean handleEvent(Event evt)
   {  if (evt.id == Event.WINDOW_DESTROY 
         && evt.target == this)
         System.exit(0);
      return super.handleEvent(evt);
   }  







//Koordinaatide sisestamine
class Sisse2 extends Dialog
{  TextField fromx = new TextField("5", 3); 
	TextField fromy = new TextField("-5", 3);
	Label lb;
	String fx, fy;
	int i=1;
	String label="Sisesta "+i+". punkti koordinaadid";
	public int[] nx = new int[(nurki+1)];
	public int[] ny = new int[(nurki+1)];
   public Sisse2(Frame parent){
      super(parent, "Sisesta koordinaadid" ,true);
	   Panel p1 = new Panel();
	   lb = new Label(label);
      p1.add(lb);
      add("North", p1);
                
      Panel p2 = new Panel();
      p2.setLayout(new FlowLayout());
      p2.add(new Label("x="));
      p2.add(fromx);
      p2.add(new Label("y="));
      p2.add(fromy);
      add("Center", p2);

      Panel p3 = new Panel();
      p3.add(new Button(" Ok "));
      add("South", p3);
      resize(300, 130);
      setLocation(200, 300);
   }

   public boolean action(Event evt, Object arg)
   {
      if(arg.equals(" Ok "))
      {	fx = (fromx.getText());
        	nx[i] = Integer.parseInt(fx);
        	fy = (fromy.getText());
        	ny[i] = Integer.parseInt(fy);
	      if (i>=nurki)
      	{	joonis=100;
	      	dispose();
         	return true;
         }
         i++;
	      label="Sisesta "+i+". punkti koordinaadid";
		   lb.setText(label);
         
      }
      return false;
   }

   public boolean handleEvent(Event evt)
   {  if (evt.id == Event.WINDOW_DESTROY 
         && evt.target == this)
         dispose();                  
      return super.handleEvent(evt);
   }
}



//Pindala ja ümbermõõdu arvutamine
class Annap 
{  public double yy, xx, jag, jag1, jag2,x1,x2,x00;
	public int a=0;
	public Annap()
	{
	jag1 = ( y[2] - y[1] );
	jag2 = ( y[4] - y[3] );
	System.out.println(jag1);
	System.out.println(jag2);
	if (((jag1 != 0) || (jag2 != 0)) || ((jag1 != 0) && (jag2 != 0)))
	{	x00 = (x[4]-x[3])/jag2 - (x[2]-x[1])/jag1;
		x1 = (x[3]-y[3]*(x[4]-x[3])/(y[4]-y[3])) - (x[1]-y[1]*(x[2]-x[1])/(y[2]-y[1])) ;
		x2 = (x[2]-x[1])/jag1*(x[3]-y[3]*(x[4]-x[3])/(y[4]-y[3])) - (x[4]-x[3])/jag2*(x[1]-y[1]*(x[2]-x[1])/(y[2]-y[1]));
		yy = x1 / x00;
		xx = - x2 / x00;
		ring = 1;
		a=1;
		
	}
	if ((y[1]<y[2]) && (x[1]<x[2]) && (a == 1))
		{ if ((yy>y[1]) && (yy<y[2]) && (xx>x[1]) && (xx<x[2])) ring=1 ;
		}
	else if ((y[1]<y[2]) && (x[1]>x[2]) && (a == 1))
		{ if ((yy>y[1]) && (yy<y[2]) && (xx<x[1]) && (xx>x[2])) ring=1 ;
		}
	else if ((y[1]>y[2]) && (x[1]<x[2]) && (a == 1))
		{ if ((yy<y[1]) && (yy>y[2]) && (xx>x[1]) && (xx<x[2])) ring=1 ;
		}
	else if ((y[1]>y[2]) && (x[1]>x[2]) && (a == 1))
		{ if ((yy<y[1]) && (yy>y[2]) && (xx<x[1]) && (xx>x[2])) ring=1 ;
		}
	else ring=2;
	}
	

}


//Kasutus juhend
class Juhis extends Dialog
{  public Juhis(Frame parent)
   {  super(parent, "Juhis", true);         
      
      Panel p1=new Panel();
      p1.setLayout(new GridLayout(6, 1));
      p1.add(new Label(" Kuidas kasutada programmi ? "));
      p1.add(new Label("1. Vali menüü ribalt Algus"));    
      p1.add(new Label("2. Seejärel sisesta andmed AINULT täis arvuliselt"));    
      p1.add(new Label("3. Nüüd joonistab programm sinu andmete järgi jooned"));    
      p1.add(new Label("   ning kontrollib kas need on paralleelsed või kas "));
      p1.add(new Label("   nad lõikuvad, ning märgib ära lõikepunkti. "));    
      add("North", p1);
      
      Panel p2=new Panel();
      p2.add(new Button(" Ok "));
      add("South",p2);
      resize(300, 200);
      setLocation(200, 300);
   }

   public boolean action(Event evt, Object arg)
   {
      if(arg.equals(" Ok "))
      {  dispose();
         return true;
      }
		return false;
   }

   public boolean handleEvent(Event evt)
   {  if (evt.id == Event.WINDOW_DESTROY 
         && evt.target == this)
         dispose();                  
      return super.handleEvent(evt);
   }

}


//Autori sõna
class Autorilt extends Dialog
{  public Autorilt(Frame parent)
   {  super(parent, " Autorilt ", true);         
      Panel p1 = new Panel();
      p1.setLayout(new GridLayout(3,1));
      p1.add(new Label("Joonte Joonistaja"));
      p1.add(new Label("Versioon 1.0"));
      p1.add(new Label("Koostanud Janno Rütter"));
      add("Center", p1);
                
      Panel p2 = new Panel();
      p2.add(new Button(" Ok "));
      add("South", p2);
      resize(220, 150);
      setLocation(200, 300);
   }

   public boolean action(Event evt, Object arg)
   {
      if(arg.equals(" Ok "))
      {  dispose();
         return true;
      }
      return false;
   }

   public boolean handleEvent(Event evt)
   {  if (evt.id == Event.WINDOW_DESTROY 
         && evt.target == this)
         dispose();                  
      return super.handleEvent(evt);
   }
}
}