imagehelper.java

tiled地图编辑器是2d的,很不错的国外软件,使用起来很方便的

/*
 *  Tiled Map Editor, (c) 2004-2006
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 * 
 *  Adam Turk <[e-mail]>
 *  Bjorn Lindeijer <[e-mail]>
 */

package tiled.io;

import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.File;
import javax.imageio.ImageIO;


/**
 * This class provides functions to help out with saving/loading images.
 *
 * @version $Id: ImageHelper.java 683 2006-06-25 14:17:37Z bjorn $
 */
public class ImageHelper
{
    /**
     * Converts an image to a PNG stored in a byte array.
     * 
     * @param image
     * @return a byte array with the PNG data
     */
    static public byte[] imageToPNG(Image image) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        try {
            BufferedImage buffer = new BufferedImage(
                    image.getWidth(null), image.getHeight(null),
                    BufferedImage.TYPE_INT_ARGB);

            buffer.createGraphics().drawImage(image, 0, 0, null);
            ImageIO.write(buffer, "PNG", baos);
            baos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return baos.toByteArray();
    }

    /**
     * Converts a byte array into an image. The byte array must include the image
     * header, so that a decision about format can be made.
     *
     * @param imageData The byte array of the data to convert.
     * @return Image The image instance created from the byte array
     * @throws IOException 
     * @see java.awt.Toolkit#createImage(byte[] imagedata)
     */
    static public Image bytesToImage(byte[] imageData) throws IOException {
        return ImageIO.read(new ByteArrayInputStream(imageData));
    }

    /**
     * This function loads the image denoted by <code>file</code>. This supports
     * PNG, GIF, JPG, and BMP (in 1.5).
     *
     * @param file
     * @return the (partially) loaded image
     * @throws IOException
     */
    static public Image loadImageFile(File file) throws IOException {
        return ImageIO.read(file);
    }
}