circle.java

一个简单绘图程序

//********************************************************************
//  Circle.java       Author: XieXing
//
//  Creat a Circle subclass.
//********************************************************************
import java.awt.*;

public class Circle extends Shapes 
{
   // 构造函数开始
   public Circle( int firstX, int firstY, int secondX, int secondY, 
      Color shapeColor )
   {
      super( firstX, firstY, secondX, secondY, shapeColor ); //继承Shape类构造函数

   } // 构造函数结束

   // 画圆方法
   public void draw( Graphics g )
   {
      int upperLeftX = Math.min( getX1(), getX2() );
      int upperLeftY = Math.min( getY1(), getY2() );
      int Min_length = Math.min(Math.abs(getX1() - getX2()),Math.abs(getY1() - getY2()));
      int width = Min_length;
      int height = Min_length;

      g.setColor( getColor() );
      g.drawOval( upperLeftX, upperLeftY, width, height );

   } // 方法结束

}