java project

import javax.swing.JFrame;
import javax.swing.JComponent;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

public class Herencia
{
   public static void main (String args[])
   {
      JFrame marco = new JFrame();
      marco.setSize(640, 480);
      marco.setTitle("Primitivos Gr�ficos");
      marco.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      marco.setVisible(true);

      GraphicComponent grafico = new GraphicComponent();
      marco.add(grafico);
   }
}

class GraphicComponent extends JComponent
{
   public void paintComponent(Graphics g)
   {

      Poligono miPoligono = new Poligono(5, 40, 25);
      miPoligono.setCoordForOneVertex(0,20,40);
      miPoligono.setCoordForOneVertex(1,60,40);
      miPoligono.setCoordForOneVertex(2,60,10);
      miPoligono.setCoordForOneVertex(3,20,10);
      miPoligono.setCoordForOneVertex(4,30,30);
      miPoligono.moveDown(100);
      miPoligono.draw(g);

      Triangulo triangle1 = new Triangulo(10,10,30,50,40,20,25,30);
      triangle1.draw(g);

      Rectangulo rectangle1= new Rectangulo(80,60,140,80);
      rectangle1.draw(g);

      g.setColor(Color.BLUE);
      rectangle1.grow(2);
      rectangle1.draw(g);


      g.drawString("Ejemplo de c�mo dibujar un string", 10, 160);
   }
}

class Poligono
{
   double x[], //contains x coordinate for vertices
           y[], //contains y coordinate for vertices
           xc,  //(xc,yc) = figure's center or
           yc;  //reference point

   int    totalPoints; //number of vertices

   //Given method: Explain function
   Poligono()
   {
   }

   Poligono(int totalPoints, double xc, double yc)
   {
      this.totalPoints = totalPoints;
      x = new double[totalPoints];
      y = new double[totalPoints];
      this.xc = xc;
      this.yc = yc;
   }

   void setCenterCoords(double xc, double yc)
   {
      this.xc = xc;
      this.yc = yc;
   }

   void setCoordForOneVertex(int index, double x, double y)
   {
      if ((index < totalPoints)&& (index >= 0))
      {
         this.x[index] = x;
         this.y[index] = y;
      }
   }

   void grow(double factor)
   {
      int i;

      for (i = 0; i < totalPoints; i++)
      {
         x[i] = (x[i] - xc) * factor + xc;
         y[i] = (y[i] - yc) * factor + yc;
      }
   }

   //New method: TO DO
   double getPerimeter()
   {
      double perimeter = 0;
      {
         //requires the code to calculate the perimeter
      }
      return (perimeter);
   }

   void moveDown(double displacement)
   {
      for (int i = 0; i < totalPoints; i++)
      {
         y[i] = y[i] + displacement;
      }
      yc = yc + displacement;
   }

   void draw(Graphics g)
   {
      Graphics2D g2 = (Graphics2D) g;
      int i;
      Line2D.Double linea = new Line2D.Double(150, 200, 200, 240);
      for (i = 0; i < totalPoints - 1; i++)
      {
    	 linea = new Line2D.Double(x[i], y[i], x[i+1], y[i+1]);
         g2.draw(linea);
      }
 	  linea = new Line2D.Double(x[0], y[0], x[totalPoints - 1], y[totalPoints - 1]);
      g2.draw(linea);
   }
}

class Triangulo extends Poligono
{
   Triangulo(double x1, double y1, double x2, double y2,
            double x3, double y3, double xc, double yc)
   {
      super(3,xc,yc);
      setCoordForOneVertex(0, x1, y1);
      setCoordForOneVertex(1, x2, y2);
      setCoordForOneVertex(2, x3, y3);
   }

   //New method: TO DO
   double getArea()
   {
      double area = 0.0;
      {
         //requires code to calculate area
      }
      return (area);
   }

   //New method: TO DO
   void displayStringInside(String theString)
   {
      //requires code to display theString centralized
      //within the figure
   }
}

class Rectangulo extends Poligono
{
   //New: Given constructor
   Rectangulo ()
   {
      super(4,0.0,0.0);
   }

   Rectangulo (double x1, double y1, double x2, double y2)
   {
      super(4,0.0,0.0);
      double midX,
              midY;

      midX = (x1 + x2)/2.0;
      midY = (y1 + y2)/2.0;
      setCenterCoords(midX,midY);
      setCoordForOneVertex(0, x1, y1);
      setCoordForOneVertex(1, x2, y1);
      setCoordForOneVertex(2, x2, y2);
      setCoordForOneVertex(3, x1, y2);
   }

   //New method: TO DO
   double getArea()
   {
      double area = 0.0;
      {
         //requires code to calculate area
      }
      return (area);
   }

   //New method: TO DO
   void displayStringInside(String theString)
   {
      //requires code to display theString centralized
      //within the figure
   }
}

//*** New class: Given and to be Explained
class Cuadrado extends Rectangulo
{
  Cuadrado (double x1, double y1, double width)
  {
     super(x1,y1,x1+width,y1+width);
  }
}