myrectangle.java

高级java2 大学教程(含源码,经典的Java学习教程

// MyRectangle.java
// MyRectangle is a MyShape subclass that represents a 
// rectangle, including an implementation of the draw method
// for drawing the rectangle on a Graphics2D context.
package com.deitel.advjhtp1.drawing.model.shapes;

// Java core packages
import java.awt.*;
import java.awt.geom.*;

// third-party packages
import org.w3c.dom.*;

public class MyRectangle extends MyShape {

   // draw MyRectangle on given Graphics2D context
   public void draw( Graphics2D g2D )
   {
      // configure Graphics2D (gradient, color, etc.)
      configureGraphicsContext( g2D );
      
      // create Rectangle2D for drawing MyRectangle
      Shape shape = new Rectangle2D.Float( getLeftX(),
         getLeftY(), getWidth(), getHeight() );

      // if shape is filled, draw filled shape
      if ( isFilled() )
         g2D.fill( shape );
      else
         g2D.draw( shape );
   }

   // return true if point falls within MyRectangle
   public boolean contains( Point2D point )
   {
      Rectangle2D.Float rectangle = new Rectangle2D.Float( 
         getLeftX(), getLeftY(), getWidth(), getHeight() );
      
      return rectangle.contains( point );
   }

   // get XML representation of MyRectangle
   public Element getXML( Document document )
   {
      Element shapeElement = super.getXML( document );
      shapeElement.setAttribute( "type", "MyRectangle" );
      
      return shapeElement;
   }
}

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