gradienticon.java

java源代码

// GradientIcon.java
// GradientIcon is an Icon implementation that draws a 16 x 16
// gradient from startColor to endColor.
package com.deitel.advjhtp1.drawing;

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

// Java extension packages
import javax.swing.*;

public class GradientIcon implements Icon {
   
   // Colors to use for gradient
   private Color startColor;
   private Color endColor;
   
   // GradientIcon constructor
   public GradientIcon( Color start, Color end )
   {
      setStartColor( start );
      setEndColor( end );
   }  

   // set gradient start color
   public void setStartColor( Color start )
   {
      startColor = start;
   }
   
   // get gradient start color
   public Color getStartColor()
   {
      return startColor;
   }
   
   // set gradient end color
   public void setEndColor( Color end )
   {
      endColor = end;
   }
   
   // get gradient end color
   public Color getEndColor()
   {
      return endColor;
   }
   
   // get icon width
   public int getIconWidth() 
   {
      return 16;
   }
   
   // get icon height
   public int getIconHeight() 
   {
      return 16;
   }   

   // draw icon at given location on given component
   public void paintIcon( Component component, Graphics g, 
      int x, int y) 
   {
      // get Graphics2D object
      Graphics2D g2D = ( Graphics2D ) g;
      
      // set GradientPaint
      g2D.setPaint ( new GradientPaint( x, y,
         getStartColor(), 16, 16,
         getEndColor() )  );
      
      // fill rectangle with gradient
      g2D.fillRect( x, y, 16, 16 );      
   }   
}

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 * (C) Copyright 2002 by Deitel & Associates, Inc. and         *
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