001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.plugins.streetside.utils;
003
004import java.awt.Image;
005
006import javax.swing.ImageIcon;
007
008import org.apache.log4j.Logger;
009import org.openstreetmap.josm.tools.I18n;
010
011public final class ImageUtil {
012
013  final static Logger logger = Logger.getLogger(ImageUtil.class);
014
015  private ImageUtil() {
016    // Private constructor to avoid instantiation
017  }
018
019  /**
020   * Scales an {@link ImageIcon} to the desired size
021   * @param icon the icon, which should be resized
022   * @param size the desired length of the longest edge of the icon
023   * @return the resized {@link ImageIcon}. It is the same object that you put in,
024   *         only the contained {@link Image} is exchanged.
025   */
026  public static ImageIcon scaleImageIcon(final ImageIcon icon, int size) {
027    if(StreetsideProperties.DEBUGING_ENABLED.get()) {
028      logger.debug(I18n.tr("Scale icon {0} → {1}", icon.getIconWidth(), size));
029    }
030    return new ImageIcon(icon.getImage().getScaledInstance(
031      icon.getIconWidth() >= icon.getIconHeight() ? size : Math.max(1, Math.round(icon.getIconWidth() / (float) icon.getIconHeight() * size)),
032      icon.getIconHeight() >= icon.getIconWidth() ? size : Math.max(1, Math.round(icon.getIconHeight() / (float) icon.getIconWidth() * size)),
033      Image.SCALE_SMOOTH
034    ));
035  }
036}