import java.awt.*;
import java.awt.geom.*;
import java.lang.Math;

public class Circulo extends Forma
{
  Circulo (Point center, double radio )
    {
      elipse = new Ellipse2D.Double(center.getX()-radio, center.getY(),
                                    2*radio, 2*radio);
    }
  
  public void paintComponent(Graphics2D g2d)
    {
      g2d.draw(elipse);
    }
  
  public void setRadio(double r)
    {
      double centerX=elipse.getX()+elipse.getWidth()/2;
      double centerY=elipse.getY()+elipse.getHeight()/2;
      elipse.setFrame(centerX-r, centerY-r, 2*r, 2*r);
    }

  public void escalar (Point c, double factor)
    {
      double x=elipse.getX();
      double y=elipse.getY();
      x = c.getX()+factor*(x-c.getX());
      y = c.getY()+factor*(y-c.getY());
      double diameter=elipse.getWidth()*factor;
      elipse.setFrame(x, y, diameter, diameter);
    }
    
  public void rotar (Point c, double deltaAngulo)
    {
      double centerX=elipse.getX()+elipse.getWidth()/2 - c.getX();
      double centerY=elipse.getY()+elipse.getHeight()/2 - c.getY();
      double distancia = Math.sqrt(centerX*centerX+centerY*centerY);
      double anguloInicial=Math.atan2(centerY, centerX);
      centerX = distancia*Math.cos(anguloInicial+deltaAngulo) + c.getX();
      centerY = distancia*Math.sin(anguloInicial+deltaAngulo) + c.getY();
      double diameter=elipse.getWidth();
      elipse.setFrame(centerX-diameter/2, centerY-diameter/2,
                      diameter, diameter);
    }

  public void trasladar (double dx, double dy)
    {
      double x=elipse.getX()+dx;
      double y=elipse.getY()+dy;
      double diameter=elipse.getWidth();
      elipse.setFrame(x, y, diameter, diameter);
    }
    
  private Ellipse2D.Double elipse;
}