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

public class Jooned extends Frame{
  int punkte = 4, k, i, joonis;
   double a1, a2, b1, b2, x, y, k1, k2;
	static int a, b;
	int[] koordx = new int[100];
	int[] koordy = new int[100];
	
   public Jooned(){
     setTitle("Jooned");
      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);
      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<punkte+1;k++){
          	koordx[k] = ab2.nx[k];
          	koordy[k] = ab2.ny[k];
	       }
          repaint();
      }
    
      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.green);
	 		for (i=1; i<punkte-2;i++){
				g.drawLine((204+(2*koordx[i])),(242-(2*koordy[i])),(204+(2*koordx[(i+1)])),(242-(2*koordy[(i+1)]))); 
				g.drawString(i+":"+koordx[i]+";"+koordy[i], 12, 420);
				g.drawString((i+1)+":"+koordx[i+1]+";"+koordy[i+1], 12, 440);
				k1=(koordy[i+1]-koordy[i])/(double)(koordx[i+1]-koordx[i]);
				a1=(koordy[i]-koordy[i+1])/(double)(koordx[i]-koordx[i+1]);
				b1=koordy[i]-(((koordy[i]-koordy[i+1])/(double)(koordx[i]-koordx[i+1]))*koordx[i]);
				System.out.println(a1+" "+b1);
	 		} 
			g.setColor(Color.blue);
			for (i=3; i<punkte;i++){
				g.drawLine((204+(2*koordx[i])),(242-(2*koordy[i])),(204+(2*koordx[(i+1)])),(242-(2*koordy[(i+1)]))); 
				g.drawString(i+":"+koordx[i]+";"+koordy[i], 72, 420);
				g.drawString((i+1)+":"+koordx[i+1]+";"+koordy[i+1], 72, 440);
				k2=(koordy[i+1]-koordy[i])/(double)(koordx[i+1]-koordx[i]);
				a2=(koordy[i]-koordy[i+1])/(double)(koordx[i]-koordx[i+1]);
				b2=koordy[i]-(((koordy[i]-koordy[i+1])/(double)(koordx[i]-koordx[i+1]))*koordx[i]);
				System.out.println(a2+" "+b2);
	 		}
			x=(b2-b1)/(double)(a1-a2);
			y=a1*(((b2-b1)/(a1-a2))+b1);
			System.out.println(x+" "+y);
			g.setColor(Color.red);
			g.drawOval((200+(2*(int)x)), (238-(2*(int)y)), 8, 8); 
		g.setColor(Color.magenta);
		if (k1==k2)
	   	g.drawString("Sirged on paralleelsed", 12, 455);
		else{
			g.drawString("Sirged pole paralleelsed", 12, 455);
		//	g.setColor(Color.orange);
			if (
		        x>Math.min(koordx[1], koordx[2]) && x<Math.max(koordx[1], koordx[2]) &&
		        x>Math.min(koordx[3], koordx[4]) && x<Math.max(koordx[3], koordx[4])		
		      )
	   		g.drawString("aga lõikuvad punktis", 212, 455);
			else
	   	g.drawString("ja nad ei lõiku", 212, 455);
		}
		}
	}
  
   public static void main(String arg[]){
     Frame f = new Jooned();
      
      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("0", 3); 
	TextField fromy = new TextField("0", 3);
	Label lb;
	String fx, fy;
	int i=1;
	String label="Sisesta "+i+". punkti koordinaadid";
	public int[] nx = new int[(punkte+1)];
	public int[] ny = new int[(punkte+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>=punkte){
	      	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);
   }
}
}