backgroundpanel.java

来自「开源项目openfire的完整源程序」· Java 代码 · 共 43 行

/**
 * $Revision: $
 * $Date: $
 *
 * Copyright (C) 2006 Jive Software. All rights reserved.
 *
 * This software is published under the terms of the GNU Lesser Public License (LGPL),
 * a copy of which is included in this distribution.
 */

package org.jivesoftware.spark.component;

import org.jivesoftware.resource.Default;

import javax.swing.JPanel;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.geom.AffineTransform;

/**
 * An implementation of a colored background panel. Allows implementations
 * to specify an image to use in the background of the panel.
 */
public class BackgroundPanel extends JPanel {

    /**
     * Creates a background panel using the default Spark background image.
     */
    public BackgroundPanel() {
    }


    public void paintComponent(Graphics g) {
        final Image backgroundImage = Default.getImageIcon(Default.TOP_BOTTOM_BACKGROUND_IMAGE).getImage();
        double scaleX = getWidth() / (double)backgroundImage.getWidth(null);
        double scaleY = getHeight() / (double)backgroundImage.getHeight(null);
        AffineTransform xform = AffineTransform.getScaleInstance(scaleX, scaleY);
        ((Graphics2D)g).drawImage(backgroundImage, xform, this);
    }
}