MemImage is an in-memory icon showing a Color gradient Java code example - Click here to copy ->>>

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Code:



 

/*

 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.

 * All rights reserved. Software written by Ian F. Darwin and others.

 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $

*/





import java.awt.*;

import java.awt.image.*;



/** MemImage is an in-memory icon showing a Color gradient. */

public class MemImage extends Component {



   /** Demo main program, showing two ways to use it.

    * Create a small MemImage and set it as this Frame's iconImage.

    * Also display a larger version of the same image in the Frame.

    */

   public static void main(String[] av) {

      Frame f = new Frame("MemImage.java");

      f.add(new MemImage());

      f.setIconImage(new MemImage(16,16).getImage());

      f.pack();

      f.setVisible(true);

   }



   /** The image */

   private Image img;

   /** The image width */

   private int w;

   /** The image height */

   private int h;



   /** Construct a MemImage with a default size */

   public MemImage() {

      this(100,100);

   }



   /** Construct a MemImage with a specified width and height */

   public MemImage(int w, int h) {

      this.w = w;

        this.h = h;

        int pix[] = new int[w * h];

        int index = 0;

        for (int y = 0; y < h; y++) {

            int red = (y * 255) / (h - 1);

            for (int x = 0; x < w; x++) {

                int blue = (x * 255) / (w - 1);

                pix[index++] = (255 << 24) | (red << 16) | blue;

            }

        }

        img = createImage(new MemoryImageSource(w, h, pix, 0, w));

      setSize(getPreferredSize());

   }



   /** Getter for the Image */

   public Image getImage() {

      return img;

   }



   public Dimension getPreferredSize() {

      return new Dimension(w, h);

   }

   public void paint(Graphics g) {

      g.drawImage(img, 0, 0, getSize().width, getSize().height, this);

   }

}