circle.java

来自「32个java程序源代码」· Java 代码 · 共 96 行

// Exercise 21.16: Circle.java
// This class represents a circle.
import java.awt.*;

public class Circle
{
   // instance variables
   private int diameter;
   private Point location;
   private Color drawnColor;

   // constructor with size, corner and shade supplied
   public Circle( int size, Point corner, Color shade )
   {
      setDiameter( size );
      setLocation( corner );
      setDrawnColor( shade );

   } // end constructor

   // get the diameter of the circle
   public int getDiameter()
   {
      return diameter;

   } // end method getDiameter

   // set the diameter of the circle
   public void setDiameter( int size )
   {
      if ( size >= 0 )
      {
         diameter = size;
      }
      else
      {
         diameter = 0;
      }

   } // end method setDiameter

   // get the location of the upper-left corner of the circle
   public Point getLocation()
   {
      return location;

   } // end method getLocation

   // set the location of the upper-left corner of the circle
   public void setLocation( Point corner )
   {
      location = corner;

   } // end method setLocation
   
   // get the color of the circle
   public Color getDrawnColor()
   {
      return drawnColor;

   } // end method getDrawnColor

   // set the color of the circle
   public void setDrawnColor( Color shade )
   {
      drawnColor = shade;

   } // end method setDrawnColor

   // draw the circle
   public void draw( Graphics g )
   {
      g.setColor( getDrawnColor() ); // set the color

      // draw a circle with the specified x, y and diameter
      g.fillOval( getLocation().x, getLocation().y, 
         getDiameter(), getDiameter() );

   } // end method draw

} // end class Circle

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