circle.java

Java 程序设计教程（第五版）EXAMPLESchap04源码

//********************************************************************
//  Circle.java       Author: Lewis/Loftus
//
//  Represents a circle with a particular position, size, and color.
//********************************************************************

import java.awt.*;

public class Circle
{
   private int diameter, x, y;
   private Color color;

   //-----------------------------------------------------------------
   //  Constructor: Sets up this circle with the specified values.
   //-----------------------------------------------------------------
   public Circle (int size, Color shade, int upperX, int upperY)
   {
      diameter = size;
      color = shade;
      x = upperX;
      y = upperY;
   }

   //-----------------------------------------------------------------
   //  Draws this circle in the specified graphics context.
   //-----------------------------------------------------------------
   public void draw (Graphics page)
   {
      page.setColor (color);
      page.fillOval (x, y, diameter, diameter);
   }

   //-----------------------------------------------------------------
   //  Diameter mutator.
   //-----------------------------------------------------------------
   public void setDiameter (int size)
   {
      diameter = size;
   }

   //-----------------------------------------------------------------
   //  Color mutator.
   //-----------------------------------------------------------------
   public void setColor (Color shade)
   {
      color = shade;
   }

   //-----------------------------------------------------------------
   //  X mutator.
   //-----------------------------------------------------------------
   public void setX (int upperX)
   {
      x = upperX;
   }


   //-----------------------------------------------------------------
   //  Y mutator.
   //-----------------------------------------------------------------
   public void setY (int upperY)
   {
      y = upperY;
   }

   //-----------------------------------------------------------------
   //  Diameter accessor.
   //-----------------------------------------------------------------
   public int getDiameter ()
   {
      return diameter;
   }

   //-----------------------------------------------------------------
   //  Color accessor.
   //-----------------------------------------------------------------
   public Color getColor ()
   {
      return color;
   }

   //-----------------------------------------------------------------
   //  X accessor.
   //-----------------------------------------------------------------
   public int getX ()
   {
      return x;
   }

   //-----------------------------------------------------------------
   //  Y accessor.
   //-----------------------------------------------------------------
   public int getY ()
   {
      return y;
   }
}