001/*
002 * $Id: JPanelImage.java,v 1.5 2011/03/24 16:06:34 davep Exp $
003 *
004 * This file is part of McIDAS-V
005 *
006 * Copyright 2007-2011
007 * Space Science and Engineering Center (SSEC)
008 * University of Wisconsin - Madison
009 * 1225 W. Dayton Street, Madison, WI 53706, USA
010 * https://www.ssec.wisc.edu/mcidas
011 * 
012 * All Rights Reserved
013 * 
014 * McIDAS-V is built on Unidata's IDV and SSEC's VisAD libraries, and
015 * some McIDAS-V source code is based on IDV and VisAD source code.  
016 * 
017 * McIDAS-V is free software; you can redistribute it and/or modify
018 * it under the terms of the GNU Lesser Public License as published by
019 * the Free Software Foundation; either version 3 of the License, or
020 * (at your option) any later version.
021 * 
022 * McIDAS-V is distributed in the hope that it will be useful,
023 * but WITHOUT ANY WARRANTY; without even the implied warranty of
024 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
025 * GNU Lesser Public License for more details.
026 * 
027 * You should have received a copy of the GNU Lesser Public License
028 * along with this program.  If not, see http://www.gnu.org/licenses.
029 */
030
031package edu.wisc.ssec.mcidasv.ui;
032
033import java.awt.Color;
034import java.awt.Graphics;
035import java.awt.Graphics2D;
036import java.awt.Image;
037import java.awt.RenderingHints;
038import java.awt.geom.AffineTransform;
039import java.awt.image.BufferedImage;
040
041import javax.swing.JPanel;
042
043/**
044 * Extend JPanel to draw an optionally anti-aliased image filling the panel
045 */
046public class JPanelImage extends JPanel {
047        
048        // The image to draw in the panel
049        private Image theImage;
050        
051        // Use anti-aliasing
052        private boolean aa = true;
053        
054        public JPanelImage() {}
055        
056        public JPanelImage(Image panelImage) {
057                theImage = panelImage;
058        }
059        
060        public boolean getAntiAlias() {
061                return aa;
062        }
063        
064        public void setAntiAlias(boolean setAA) {
065                aa = setAA;
066        }
067        
068        public Image getImage() {
069                return theImage;
070        }
071        
072        public void setImage(Image panelImage) {
073                theImage = panelImage;
074        }
075        
076        @Override
077        public void update(Graphics g) {
078                paint(g);
079        }
080        
081        @Override
082        public void paint(Graphics g) {
083                if (aa) {
084                        BufferedImage newImage = new BufferedImage(
085                                        this.getWidth(), this.getHeight(), BufferedImage.TYPE_INT_RGB);
086                        double scaleX = (double)theImage.getWidth(null) / (double)this.getWidth();
087                        double scaleY = (double)theImage.getHeight(null) / (double)this.getHeight();
088                        double scaleXY = 1.0 / (Math.max(scaleX, scaleY));
089                        Graphics2D g2d = newImage.createGraphics();
090                        g2d.setBackground(Color.black);
091                        g2d.clearRect(0, 0, this.getWidth(), this.getHeight());
092
093                        RenderingHints hints = new RenderingHints(null);
094                        hints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
095                        hints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
096                        hints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
097                        g2d.setRenderingHints(hints);
098
099                        g2d.drawImage(theImage, AffineTransform.getScaleInstance(scaleXY, scaleXY), null);
100                        g.drawImage(newImage, 0, 0, null);
101                }
102                else {
103                        g.drawImage(theImage, 0, 0, this.getWidth(), this.getHeight(), null);
104                }
105        }
106}