import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class Joon extends Applet implements  ActionListener{
 TextField x11=new TextField("");
 TextField y11=new TextField("");
 TextField x21=new TextField("");
 TextField y21=new TextField(""); 
 TextField x12=new TextField("");
 TextField y12=new TextField("");
 TextField x22=new TextField("");
 TextField y22=new TextField(""); 
 TextField para=new TextField("");  

 int algX1 = 0, algY1 = 0, loppX1 = 0, loppY1 = 0, 
     algX2 = 0, algY2 = 0, loppX2 = 0, loppY2 = 0,
     x0 = 125, y0 = 165;

 public void paint(Graphics g)
 {
  g.setColor(Color.gray);
  g.drawLine(x0 - 100, y0, x0 + 100, y0);
  g.drawLine(x0, y0 - 100, x0, y0 + 100);
  g.setColor(Color.black);
  g.drawLine(x0 + (algX2), y0 - (algY2), x0 + (loppX2), y0 - (loppY2));
  g.setColor(Color.red);
  g.drawLine(x0 + (algX1), y0 - (algY1), x0 + (loppX1), y0 - (loppY1));
 }
 
 public void init()
 {
  setLayout(new BorderLayout());
  Panel p1=new Panel(new GridLayout(1, 4));
  Panel p2=new Panel(new GridLayout(2, 4));
  Panel p3=new Panel(new GridLayout(2, 4));
  Label tekst1=new Label("x1", Label.CENTER);
  Label tekst2=new Label("x2", Label.CENTER);
  Label tekst3=new Label("x3", Label.CENTER);
  Label tekst4=new Label("x4", Label.CENTER);
  Label tekst5=new Label("y1", Label.CENTER);
  Label tekst6=new Label("y2", Label.CENTER);
  Label tekst7=new Label("y3", Label.CENTER);
  Label tekst8=new Label("y4", Label.CENTER);
  p2.add(tekst1);
  p2.add(x11);
  p2.add(tekst5);
  p2.add(y11);
  p2.add(tekst2);
  p2.add(x21);
  p2.add(tekst6);
  p2.add(y21);
  p1.add(p2);
  p3.add(tekst3);
  p3.add(x12);
  p3.add(tekst7);
  p3.add(y12);
  p3.add(tekst4);
  p3.add(x22);  
  p3.add(tekst8);
  p3.add(y22);
  p1.add(p3);
  add(p1, BorderLayout.NORTH);
  add(para, BorderLayout.SOUTH);
  x11.addActionListener(this);
  y11.addActionListener(this);
  x21.addActionListener(this);
  y21.addActionListener(this);
  x12.addActionListener(this);
  y12.addActionListener(this);
  x22.addActionListener(this);
  y22.addActionListener(this);
 }
  
 public void actionPerformed(ActionEvent e)
 {
  double tous1, tous2, tousuVahe, ax1, ay1, lx1, ly1, ax2, ay2, lx2, ly2;
  para.setText("");
  algX1 = (numbriks(x11));
  algY1 = (numbriks(y11));
  loppX1 = (numbriks(x21));
  loppY1 = (numbriks(y21));
  algX2 = (numbriks(x12));
  algY2 = (numbriks(y12));
  loppX2 = (numbriks(x22));
  loppY2 = (numbriks(y22));
  ax1 = algX1;
  ay1 = algY1;
  lx1 = loppX1;
  ly1 = loppY1;
  ax2 = algX2;
  ay2 = algY2;
  lx2 = loppX2;
  ly2 = loppY2;
  tous1 = ((ay1 - ly1) / (ax1 - lx1));
  tous2 = ((ay2 - ly2) / (ax2 - lx2));

  repaint();  
  if (tous1 == tous2)
  {
   para.setText("Jooned on paraleelsed");
  }
 }
 
 int numbriks(TextField tf)
 {
  return Integer.parseInt(tf.getText().trim());
 }
}