import java.awt.*;
import java.applet.*;
import java.lang.*;
public class spi extends java.applet.Applet {
  int       i,x1,x2,xi,y1,y2,yi;
  String    teetha,teethb,rA,rB;
  TextField t1,t2;
  Label	    l1,l2,iter;
  Panel     controlPanel,infoPanel;

  public void init() {
    teetha=getParameter("A");
    teethb=getParameter("B");
    rA=getParameter("rA");
    i=Integer.parseInt(rA);

    resize(300,400);

    setBackground(new Color(0,0,0));
    setForeground(new Color(255,255,255));
    setLayout(new BorderLayout());

    controlPanel = new Panel();
    controlPanel.setLayout(new GridLayout(2,4));
    add("North", controlPanel);

    controlPanel.add(new Label("A:",Label.RIGHT));	
    t1=new TextField(teetha,3);
    t1.setBackground(new Color(255,255,255));
    t1.setForeground(new Color(0,0,0));
    controlPanel.add(t1);

    controlPanel.add(new Label("rA:",Label.RIGHT));
    l1=new Label(rA);
    controlPanel.add(l1);

    controlPanel.add(new Label("B:",Label.RIGHT));	
    t2=new TextField(teethb,3);
    t2.setBackground(new Color(255,255,255));
    t2.setForeground(new Color(0,0,0));
    controlPanel.add(t2);

    controlPanel.add(new Label("rB:",Label.RIGHT));
    l2=new Label(rB);
    controlPanel.add(l2);

    infoPanel = new Panel();
    infoPanel.setLayout(new GridLayout(1,4));
    add("South", infoPanel);

    infoPanel.add(new Label("i:",Label.RIGHT));	
    iter=new Label();
    infoPanel.add(iter);
  }

  public boolean action(Event evt,Object arg) {
    if(evt.target instanceof TextField)	{
      teetha=t1.getText();
      teethb=t2.getText();
      repaint();			
      return true;
    }
    return false;	
  }

  public boolean mouseDrag(Event evt,int x, int y) {
    if(y>0&&y<300) i=y/2;
    l1.setText(String.valueOf(i));
    l2.setText(String.valueOf(150-i));
    repaint();
    return true;
  }

  public void paint(Graphics g) {
    int c=0;
    double tha=0,thb=0;
    double ra=(double)i;
    double rb=150-(double)i;
    double ta=Double.valueOf(teetha).doubleValue();
    double tb=Double.valueOf(teethb).doubleValue();

    g.setColor(new Color(255,255,255));

    xi=x1=(int)((ra*Math.cos(tha))+(rb*Math.cos(thb)));
    yi=y1=(int)((ra*Math.sin(tha))+(rb*Math.sin(thb)));

    do {
      c++;
      x2=x1;
      y2=y1;
      tha+=ta;
      thb+=tb;
      x1=(int)((ra*Math.cos(tha))+(rb*Math.cos(thb)));
      y1=(int)((ra*Math.sin(tha))+(rb*Math.sin(thb)));
      g.drawLine(x1+150,y1+210,x2+150,y2+210);
    }
    while(!((Math.abs(x1-xi)<2)&&(Math.abs(yi-y1)<2)));
    iter.setText(String.valueOf(c));
  }
}