import java.applet.*;
import java.awt.*;
import java.awt.event.*;
 
public class Laineline2 extends Applet implements MouseListener {                
int mitmes=0;
int x1,y1,x2,y2,x;
 
public void init(){
clearMe();  
addMouseListener(this);                        
  }
 
 void clearMe() { 
 getGraphics().clearRect(0, 0, getSize().width, getSize().height);
}

private void drawSine() {
  Graphics g = getGraphics();
  int juppe = 10;
  double d = (Math.abs(x1-x2) + Math.abs(y1-y2));
 
 
  int dist = 2;
  double ddy = (x2-x1) / (dist*juppe);
  double ddx = (y2-y1) / (dist*juppe);
 
 int oldx = x1;
 int oldy = y1;
 
 for (int i = 0; i < d; i++) {
 int x = (int)(x1 + (i/d) * (x2-x1));
 int y = (int)(y1 + (i/d) * (y2-y1));
 double diff = Math.sin(2 * juppe * 3.14159264 * i / d);
 int dx = -(int)(ddx * diff);
 int dy = (int)(ddy * diff);
 
                     
 
 g.setColor(Color.green);
 g.drawLine(oldx, oldy, x+dx, y+dy);
 oldx = x+dx;
 oldy = y+dy;
 }
}

private void setPoint(MouseEvent e) {
  Graphics g=getGraphics();
  g.setColor(Color.red);                     
 
  
  mitmes %= 2; 
 
 if ((mitmes%2) == 0) {
  clearMe();  
 }
 
 g.drawString(mitmes+" ",e.getX(),e.getY());
 
 mitmes++;
 if (mitmes==1) {
 x1=e.getX();
 y1=e.getY();
  }
 if (mitmes==2) {
 x2=e.getX();
 y2=e.getY();
 
 drawSine();
    }
      }
 
 public void mousePressed (MouseEvent e) {
 setPoint(e);
                }
 
 public void mouseReleased(MouseEvent e) {
 setPoint(e);
                }
 
 public void mouseExited(MouseEvent e){}
 public void mouseEntered(MouseEvent e){}
 public void mouseClicked(MouseEvent e){} 
 
 }